CN1063195C - Method for preparing polyester - Google Patents
Method for preparing polyester Download PDFInfo
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- CN1063195C CN1063195C CN97103898A CN97103898A CN1063195C CN 1063195 C CN1063195 C CN 1063195C CN 97103898 A CN97103898 A CN 97103898A CN 97103898 A CN97103898 A CN 97103898A CN 1063195 C CN1063195 C CN 1063195C
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Abstract
The present invention discloses a method for preparing polyester, particularly a method for preparing polyester by the reaction of polycarboxylic acid and polylol. The method comprises that the polycarboxylic acid is added in a reactor once, and the polylol is added in the reactor in a mode of continuous dripping by two steps; the molar ratio of hydroxy groups which the polylol added in the reactor for the last time contains to hydroxy groups which a reaction substance in the reactor contains is 2 to 1, and thus, the method of the present invention farthest reduces the generation of the polyether of a side product to make the molecular weight of actual measurement in the product of the polyester approach to design molecular weight. The performance of the heat degradation resistance and the photodegradation resistance of the product of the polyester of the present invention is obviously improved.
Description
The present invention relates to a kind of preparation method of polyester, more specifically to a kind of method by polyvalent alcohol and polycarboxylic acid prepared in reaction polyester.
As everyone knows, polyester can carry out esterification or transesterification reaction by polycarboxylic acid or multi-carboxylate and polyvalent alcohol and make.U.S. Pat 4077945 discloses a kind of method for preparing polyester, be characterized in a part of ethylene glycol added earlier in the autoclave and depress heating adding, then remaining ethylene glycol and terephthalic acid are mixed and made into prepolymer, again this prepolymer is added in the ethylene glycol of described heating, the weak point of this method is that ethylene glycol is excessive when the reaction beginning, like this in the process of preparation polyester, one-tenth ether reaction between the ethylene glycol takes place easily, so in polyester product, often contain polyether chain or produce the by product polyethers, and the stability to light and heat of polyester product is reduced.U.S. Pat 4223124 discloses the method that a kind of preparation contains low ether byproduct polyester, this method is earlier by polycarboxylic acid or ester and polyol reaction generation polyester oligomer, then with this oligopolymer as solvent, in this oligopolymer, add polycarboxylic acid and polyvalent alcohol, its characteristics polyprotonic acid can once add, also can add step by step, polyvalent alcohol then is in two steps so that the unlimited step adds, and the polyvalent alcohol that adds in the reaction starting stage is in shortage, step of reaction or final reaction stage polyvalent alcohol were excessive and afterwards, thereby reduced the polyoxyalkylene constituent in the polyester, but this patent fails to provide the method that reduces contained polyethers in the polyester product to greatest extent.
The purpose of this invention is to provide a kind of novel method for preparing polyester, this method can reduce the polyoxyalkylene constituent in the polyester product to greatest extent, thereby makes the actual measurement molecular weight of products obtained therefrom more approaching with the design molecular weight.
Another object of the present invention is the polyester product of preparation narrow molecular weight distribution.
For achieving the above object, the solution that the present invention adopts is: when preparing polyester by polycarboxylic acid and polyol reaction, once add polycarboxylic acid in the reactor, polyvalent alcohol adds in the reactor in the substep mode, and make that in the end the amount of institute's hydroxyl in the polyvalent alcohol that the step adds is 2a (mole), the cumulative amount of institute's hydroxyl in the polyvalent alcohol that all each steps add is M-a (mole) before the final step, wherein M is the amount (mole) of contained carboxyl in the whole carboxylic acids that added, and a is amount (mole) poor of contained carboxyl in amount (mole) and the whole polycarboxylic acids that added of institute's hydroxyl in the whole polyvalent alcohols that added.
By adopting above-mentioned technical scheme, the amount that can guarantee in the end institute's hydroxyl in the polyvalent alcohol that a step added is 2 with the mol ratio that the final step polyvalent alcohol adds the amount of contained carboxyl in the preceding esterification liquid, in this case, the actual measurement molecular weight of gained polyester product and design molecular weight are more approaching.And two mol of alcohol and moles of carboxylic acids reaction generate with hydroxy-end capped product, generally only generate a kind of like this product of HOR ' OOC-R-COOR ' OH in theory, thereby make the molecular weight distribution of final product narrower; If the mol ratio of the amount of carboxyl is less than 2 in the esterification liquid before in the end an amount that goes on foot institute's hydroxyl in the polyvalent alcohol that is added adds with adding final step polyvalent alcohol, then can generate two or more products, promptly can generate products such as HOR ' OOC-R-COOR ' OH and HOR ' OOC-R-COOR ' OOC-R-COOR ' OH; If the mol ratio of the amount of carboxyl is less than 2 in the esterification liquid before the amount of institute's hydroxyl adds with adding final step polyvalent alcohol in the polyvalent alcohol that final step added, then having into the ether side reaction takes place, and the polyol reaction that adds with the product of carboxy blocking and final step that has generated when not adding the final step polyvalent alcohol and the product that generates also has multiple possibility, thereby the products therefrom molecular weight distribution is widened.
The said polyvalent alcohol of the present invention adds in the reactor in the substep mode, be meant polyvalent alcohol can be in two steps, three steps, four steps, five steps, six steps, seven steps, eight steps, nine steps, ten steps or above the adding in the reactor in ten steps until being added drop-wise in the reactor continuously.
The said polyvalent alcohol of the present invention has following chemical structural formula:
R
1(OH)
mR wherein
1Be alkyl, aryl, alkaryl, aralkyl, alkylene, halo alkyl etc., m=2～4.Work as R
1During for alkyl, alkylene, halo alkyl, R
1Contain 2 to 16 carbon atoms; Work as R
1During for aryl, alkaryl, aralkyl, R
1Contain 8 to 16 carbon atoms.More specifically, said polyvalent alcohol is one of the various isomer, pentanediol, hexylene glycol, glycerol, TriMethylolPropane(TMP), trimethylolethane of the various isomer that are selected from ethylene glycol, propylene glycol, butyleneglycol or the mixture of above-mentioned polyvalent alcohol.
The said polycarboxylic acid of the present invention has following chemical structural formula:
R
2(COOH)
pR wherein
2Be alkyl, aryl, alkaryl, aralkyl, alkylene, halo alkyl etc., p=2～4.Work as R
2During for alkyl, alkylene, halo alkyl, R
2Contain 0 to 14 carbon atom; Work as R
2During for aryl, alkaryl, aralkyl, R
2Contain 6 to 14 carbon atoms.More specifically, wherein said alkyl polycarboxylic acid can be oxalic acid, propanedioic acid, Succinic Acid, pentanedioic acid, hexanodioic acid, pimelic acid, suberic acid, nonane diacid, sebacic acid or similar alkyl polyprotonic acid; Said aryl polycarboxylic acid can be the various isomer such as the terephthalic acid of phthalic acid or naphthalic acid; Said alkaryl polycarboxylic acid can be the various isomer of the various isomer of the various isomer of dimethyl benzene dioctyl phthalate such as dimethyl terephthalic acid, diethylbenzene dioctyl phthalate such as diethyl terephthalic acid or diethyl m-phthalic acid, dimethylnaphthalene dioctyl phthalate as 2,6-dimethylnaphthalene dioctyl phthalate and 2, the various isomer of 5-dimethylnaphthalene dioctyl phthalate, diethyl naphthalic acid.The said polycarboxylic acid of the present invention can be selected from the mixture of one of above-mentioned carboxylic acid or above-mentioned carboxylic acid.
According to method of the present invention, in the whole polyvalent alcohols that added in the amount of institute's hydroxyl and the whole polycarboxylic acids that added the ratio of the amount of contained carboxyl be 1～1.6 (mol ratio).
The reaction of said polyvalent alcohol of the present invention and polycarboxylic acid is preferably under the protection of inert gas to be carried out, and said rare gas element can be nitrogen, helium, argon gas, methane or carbonic acid gas.
The reaction of said polyvalent alcohol of the present invention and polycarboxylic acid can or add to depress under normal pressure to be carried out, and generally can carry out under normal pressure to 7 normal atmosphere.
The temperature of reaction of said polyvalent alcohol of the present invention and polycarboxylic acid is 80～400 ℃.The corresponding reaction times is 1～100 hour, and reaction conditions is for to react under 100～260 ℃ temperature 10～20 hours preferably.
The water that said polyvalent alcohol of the present invention and polycarboxylic acid are generated in reaction process can be taken out of by rare gas element, also can remove by distillation.
The reaction of said polyvalent alcohol of the present invention and polycarboxylic acid can be carried out in the presence of traditional catalyst, also can be without catalyzer.Said traditional catalyst is oxide compound or other catalyzer commonly used of antimony, iron, titanium, zinc, cobalt, lead, magnesium, nickel etc.
Less than 5 milligrams of potassium hydroxide/gram polyester, be generally less than 1 milligram of potassium hydroxide/gram polyester according to the acid number of the obtained polyester product of method of the present invention.
Below in conjunction with embodiments of the invention the specific embodiment of the present invention is described in further detail, but the present invention is not limited to this.In each embodiment and Comparative Examples, the design molecular weight of polyester can be released by polymerization degree n (n=M/a), and the actual measurement molecular weight is that the measured value by hydroxyl value and acid number calculates.Concerning linear polyester, the actual measurement estimating of molecular weight is as follows:
Proofread and correct hydroxyl value=hydroxyl value+acid number
Actual measurement molecular weight=56100 * 2/ are proofreaied and correct hydroxyl value hydroxyl value wherein and are measured according to the GB12008.3-89 method; Acid number is measured according to the GB12008.5-89 method.
Embodiment 1
Molar ratio of alcohol to acid is 1.3, and 1000 diacid of restraining oneself are added in the reactor, adds 246 gram ethylene glycol and 62 grams 1 again, the 2-propylene glycol, and logical nitrogen, elevated temperature begins to stir about 100 ℃ gradually, and reaction is 5 hours between 120 to 210 ℃; When being cooled to 190 ℃, in reactor, add 211 gram ethylene glycol and 53 grams 1, the 2-propylene glycol, reaction is 2 hours between 170 to 210 ℃, in 2 hours, the temperature of reactor is brought up to 240 ℃ by 210 ℃,, be cooled to 150 ℃ of left and right sides dischargings 240 ℃ of reactions 7 hours, the acid number of poly-(adipate glycol-propylene glycol ester) that obtains is 0.23 milligram of potassium hydroxide/gram polyester, and hydroxyl value is 175.2 milligrams of potassium hydroxide/gram polyester.
Comparative Examples 1
Molar ratio of alcohol to acid is 1.3, and 1000 diacid of restraining oneself are added in the reactor, adds 459 gram ethylene glycol again, 115 grams 1, and the 2-propylene glycol, logical nitrogen, elevated temperature begins to stir about 100 ℃ gradually, and reaction is 4 hours between 120 to 210 ℃; In 4 hours, the temperature of reactor is brought up to 240 ℃ by 210 ℃,,, be cooled to 150 ℃ of left and right sides dischargings 250 ℃ of reactions 3 hours 240 ℃ of reactions 3 hours.The acid number of poly-(adipate glycol-propylene glycol ester) that obtains is 0.30 milligram of potassium hydroxide/gram polyester, and hydroxyl value is 112.4 milligrams of potassium hydroxide/gram polyester.
Embodiment 2
Molar ratio of alcohol to acid is 1.2, and 1000 diacid of restraining oneself are added in the reactor, adds 188 gram ethylene glycol and 47 grams 1 again, the 2-propylene glycol, and logical nitrogen, elevated temperature begins to stir about 100 ℃ gradually, and reaction is 6 hours between 120 to 210 ℃; When being cooled to 190 ℃, in reactor, add 94 gram ethylene glycol and 24 grams 1, the 2-propylene glycol, reaction is 4 hours between 180 to 210 ℃; Be cooled to 190 ℃, in reactor, add 141 gram ethylene glycol and 35 grams 1, the 2-propylene glycol, reaction is 5 hours between 180 to 210 ℃, temperature with reactor in 4 hours is increased to 240 ℃ by 210 ℃, 240 ℃ of reactions 7 hours, is cooled to 150 ℃ of left and right sides dischargings, the acid number of poly-(adipate glycol-propylene glycol ester) that obtains is 0.36 milligram of potassium hydroxide/gram polyester, and hydroxyl value is 103.0 milligrams of potassium hydroxide/gram polyester.
Comparative Examples 2
Molar ratio of alcohol to acid is 1.2, adds 1000 diacid of restraining oneself, 423 gram ethylene glycol, 106 grams 1, the 2-propylene glycol, reaction conditions is 0.55 milligram of potassium hydroxide/gram polyester with the acid number of poly-(adipate glycol-propylene glycol ester) that Comparative Examples 1. obtains, hydroxyl value is 76.1 milligrams of potassium hydroxide/gram polyester.
Embodiment 3
Molar ratio of alcohol to acid is 1.15, and 1000 diacid of restraining oneself are added in the reactor, adds 199 gram ethylene glycol and 50 grams 1 again, the 2-propylene glycol, and logical nitrogen, elevated temperature begins to stir about 100 ℃ gradually, and reaction is 6 hours between 120 to 210 ℃; When being cooled to 190 ℃, in reactor, add 100 gram ethylene glycol and 25 grams 1, the 2-propylene glycol, reaction is 4 hours between 180 to 210 ℃; Be cooled to 190 ℃, in reactor, add 105 gram ethylene glycol and 26 grams 1, the 2-propylene glycol, reaction is 5 hours between 180 to 210 ℃, in 4 hours, the temperature of reactor is brought up to 240 ℃ by 210 ℃,, be cooled to 150 ℃ of left and right sides dischargings 240 ℃ of reactions 7 hours, the acid number of poly-(adipate glycol-propylene glycol ester) that obtains is 0.60 milligram of potassium hydroxide/gram polyester, and hydroxyl value is 76.2 milligrams of potassium hydroxide/gram polyester.
Embodiment 4
Molar ratio of alcohol to acid is 1.15, and the first step adds 1000 gram sebacic acid, 144 gram ethylene glycol, 36 grams 1,2-propylene glycol; Second step added 72 gram ethylene glycol, 18 grams 1,2-propylene glycol; The 3rd step added 76 gram ethylene glycol, 19 grams 1,2-propylene glycol.Reaction conditions is with embodiment 2.The acid number of poly-(the sebacic acid ethylene glycol and 1,2-propylene glycol ester) that obtains is 0.73 milligram of potassium hydroxide/gram polyester, and hydroxyl value is 48.7 milligrams of potassium hydroxide/gram polyester.
Embodiment 5
Molar ratio of alcohol to acid is 1.1, and 1000 diacid of restraining oneself are added in the reactor, adds 211 gram ethylene glycol and 53 grams 1 again, the 2-propylene glycol, and logical nitrogen, elevated temperature begins to stir about 100 ℃ gradually, and reaction is 6 hours between 120 to 210 ℃; When being cooled to 190 ℃, in reactor, add 106 gram ethylene glycol and 27 grams 1, the 2-propylene glycol, reaction is 4 hours between 180 to 210 ℃; Be cooled to 190 ℃, in reactor, add 70 gram ethylene glycol and 17 grams 1, the 2-propylene glycol, reaction is 5 hours between 180 to 210 ℃, temperature with reactor in 4 hours is increased to 240 ℃ by 210 ℃, 240 ℃ of reactions 11 hours, is cooled to 150 ℃ of left and right sides dischargings.The acid number of poly-(adipate glycol-propylene glycol ester) that obtains is 0.74 milligram of potassium hydroxide/gram polyester, and hydroxyl value is 51.7 milligrams of potassium hydroxide/gram polyester.
Embodiment 6
Molar ratio of alcohol to acid is 1.3, and the first step adds 1000 diacid of restraining oneself, 123 gram ethylene glycol, 31 grams 1,2-propylene glycol; Second step added 123 gram ethylene glycol, 31 grams 1,2-propylene glycol; The 3rd step added 211 gram ethylene glycol, 53 grams 1,2-propylene glycol; Reaction conditions is with embodiment 2, and the polyester acid number of gained is 0.64 milligram of potassium hydroxide/gram polyester, and hydroxyl value is 130.2 milligrams of potassium hydroxide/gram polyester.
Embodiment 7
Molar ratio of alcohol to acid is 1.3, and 1000 diacid of restraining oneself are added in the reactor, adds 125.1 gram ethylene glycol and 31.3 grams 1 again, the 2-propylene glycol, and logical nitrogen, elevated temperature began to stir about 100 ℃ gradually, about 2 hours of 150 ℃ of reactions; Temperature of reaction is elevated to 170 ℃, adds 62.7 gram ethylene glycol and 15.7 grams 1 in reactor, the 2-propylene glycol reacted 1 hour; Add 31.3 gram ethylene glycol and 7.8 grams 1, the 2-propylene glycol reacted 1 hour; Add 15.7 gram ethylene glycol and 3.9 grams 1, the 2-propylene glycol reacted 1 hour; Add 7.8 gram ethylene glycol and 2 grams 1, the 2-propylene glycol reacted 1 hour; Add 3.9 gram ethylene glycol and 1 gram 1, the 2-propylene glycol, reacted 1 hour, continuation when being cooled to 190 ℃, adds 211 gram ethylene glycol and 53 grams 1 190-210 ℃ of reaction 2 hours in reactor, the 2-propylene glycol, in 2 hours, the temperature of reactor is brought up to 240 ℃ by 210 ℃,, be cooled to 150 ℃ of left and right sides dischargings 240 ℃ of reactions 7 hours.The acid number of poly-(adipate glycol-propylene glycol ester) that obtains is 0.24 milligram of potassium hydroxide/gram polyester, and hydroxyl value is 135.0 milligrams of potassium hydroxide/gram polyester.
Comparative Examples 3
Molar ratio of alcohol to acid is 1.3, and 1000 diacid of restraining oneself are added in the reactor, adds 138.2 gram ethylene glycol and 34.6 grams 1 again, the 2-propylene glycol, and logical nitrogen, elevated temperature began to stir about 100 ℃ gradually, about 2 hours of 150 ℃ of reactions; Temperature of reaction is elevated to 170 ℃, adds 69.1 gram ethylene glycol and 17.3 grams 1 in reactor, the 2-propylene glycol reacted 1 hour; Add 34.6 gram ethylene glycol and 8.7 grams 1, the 2-propylene glycol reacted 1 hour; Add 17.3 gram ethylene glycol and 4.3 grams 1, the 2-propylene glycol reacted 1 hour; Add 9.6 gram ethylene glycol and 2.4 grams 1, the 2-propylene glycol reacted 1 hour; Add 5.3 gram ethylene glycol and 1.3 grams 1, the 2-propylene glycol reacted 1 hour, continued 190-210 ℃ of reaction 2 hours, when being cooled to 190 ℃, add 183.5 gram ethylene glycol and 45.9 grams 1 in reactor, the 2-propylene glycol was brought up to 240 ℃ with the temperature of reactor by 210 ℃ in 2 hours, 240 ℃ of reactions 7 hours, be cooled to 150 ℃ of left and right sides dischargings, gained polyester acid number is 1.2 milligrams of potassium hydroxide/gram polyester, and hydroxyl value is 134.4 milligrams of potassium hydroxide/gram polyester.
Embodiment 8
Molar ratio of alcohol to acid is 1.3,1000 diacid of restraining oneself are added in the reactor, logical nitrogen, elevated temperature begins to stir about 100 ℃ gradually, and temperature of reaction is raised to 170 ℃, in 2 hours, restrain ethylene glycol with 246 with volume pump, 62 grams, 1,2 propylene glycol adds in the reactor, and reaction is 5 hours between 170 ℃ to 210 ℃; When being cooled to 190 ℃, in reactor, add 211 gram ethylene glycol and 53 grams 1, the 2-propylene glycol, reaction is 2 hours between 170 to 210 ℃, temperature with reactor in 2 hours is increased to 240 ℃ by 210 ℃, 240 ℃ of reactions 7 hours, is cooled to 150 ℃ of left and right sides dischargings.The acid number of poly-(adipate glycol-propylene glycol ester) that obtains is 0.24 milligram of potassium hydroxide/gram polyester, and hydroxyl value is 141.8 milligrams of potassium hydroxide/gram polyester.
Comparative Examples 4
Molar ratio of alcohol to acid is 1.3,1000 diacid of restraining oneself are added in the reactor, logical nitrogen, elevated temperature begins to stir about 100 ℃ gradually, and temperature of reaction is raised to 170 ℃, in 2 hours, restrain ethylene glycol with 176 with volume pump, 44 grams 1,2-propylene glycol add in the reactor, and reaction is 5 hours between 170 ℃ to 210 ℃; When being cooled to 190 ℃, in reactor, add 282 gram ethylene glycol and 70 grams 1, the 2-propylene glycol, reaction is 2 hours between 170 to 210 ℃, temperature with reactor in 2 hours is increased to 240 ℃ by 210 ℃, 240 ℃ of reactions 7 hours, is cooled to 150 ℃ of left and right sides dischargings, gained polyester acid number is 1.52 milligrams of potassium hydroxide/gram polyester, and hydroxyl value is 124.9 milligrams of potassium hydroxide/gram polyester.
Data and estimating of molecular weight the results list of embodiment and Comparative Examples is as follows:
The comparison of table 1 " substep adds pure method " and " step adds pure method "
Annotate: 1. have the expression products obtained therefrom of * to be poly-sebacic acid ethylene glycol propylene glycol ester, the expression products obtained therefrom of no * is poly-adipate glycol propylene glycol ester;
| OH/COOH | Sequence number | Add pure mode | Acid number | Hydroxyl value | The design molecular weight | The actual measurement molecular weight |
| 1.3 1.3 | Embodiment 1 Comparative Examples 1 | One step of substep | 0.23 0.30 | 175.2 112.4 | 646 646 | 640 996 |
| 1.2 1.2 | Embodiment 2 Comparative Examples 2 | One step of substep | 0.36 0.55 | 103.0 76.1 | 936 936 | 1085 1464 |
| 1.15 | Embodiment 3 | Step by step | 0.60 | 76.2 | 1227 | 1461 |
| 1.15 * | Embodiment 4 | Step by step | 0.73 | 48.7 | 1600 | 2303 |
| 1.1 | Embodiment 5 | Step by step | 0.74 | 51.7 | 1808 | 2137 |
2.OH/COOH ratio be mol ratio;
3. acid number unit is a milligram potassium hydroxide/gram polyester;
4. hydroxyl value unit is a milligram potassium hydroxide/gram polyester.
The comparison of table 2 " substep adds pure method "
Annotate: 1. in the whole polyvalent alcohols that in each example, added in the amount of institute's hydroxyl and the whole polycarboxylic acids that added the mol ratio of the amount of contained carboxyl be 1.3;
| Sequence number | Add pure number of times | OH/COOH * | Acid number | Hydroxyl value | The design molecular weight | Actual molecular weight |
| Embodiment 1 | 2 | 2.0 | 0.23 | 175.2 | 646 | 640 |
| Embodiment 6 | 3 | 2.0 | 0.64 | 130.2 | 646 | 861 |
| Embodiment 7 Comparative Examples 3 | 7 7 | 2.0 2.4 | 0.24 1.2 | 135.0 134.4 | 646 646 | 831 827 |
| Embodiment 8 Comparative Examples 4 | Drip continuously continuously and drip | 2.0 1.6 | 0.24 1.52 | 141.8 124.9 | 646 646 | 791 898 |
2.OH/COOH
*Ratio be mol ratio, the ratio of the amount of contained carboxyl in the esterification liquid before the amount of institute's hydroxyl adds with the final step polyvalent alcohol in the expression final step added polyvalent alcohol;
3. acid number unit is a milligram potassium hydroxide/gram polyester;
4. hydroxyl value unit is a milligram potassium hydroxide/gram polyester.
Data from table 1 and table 2 as can be seen, when the mol ratio that adds the amount of contained carboxyl in the preceding esterification liquid when amount that adopts substep to add pure method and make institute's hydroxyl in the added polyvalent alcohol of final step and final step polyvalent alcohol is 2, promptly adopt method of the present invention, the actual measurement molecular weight of resulting polyester product more approaches to design molecular weight, thereby has obvious superiority.
Claims (4)
1. method for preparing polyester by polycarboxylic acid and polyol reaction, said polycarboxylic acid is once to add in the reactor, said polyvalent alcohol adds in the reactor in the mode of substep, temperature of reaction is 80～400 ℃, reaction times is 1～100 hour, it is characterized in that the amount that final step adds institute's hydroxyl in the alcohol is 2a (mole); The cumulative amount of institute's hydroxyl in the alcohol that all each steps add is M-a (mole) before the final step, wherein M is the amount (mole) of contained carboxyl in the whole carboxylic acids that added, a is amount (mole) poor of institute's hydroxyl in amount (mole) and the whole polycarboxylic acids that added of institute's hydroxyl in the polyvalent alcohol that is added, and wherein said polyvalent alcohol is R
1(OH)
m, R
1Be alkyl, aryl, alkaryl, aralkyl, alkylene, halo alkyl, R is worked as in m=2～4
1During for alkyl, alkylene, halo alkyl, said R
1Base contains 2～16 carbon atoms, works as R
1During for aryl, alkaryl, aralkyl, said R
1Base contains 8～16 carbon atoms; Said polycarboxylic acid is R
2(COOH)
p, R
2Be alkyl, aryl, alkaryl, aralkyl, alkylene, halo alkyl, p=2～4, R
2During for alkyl, alkylene, halo alkyl, said R
2Base contains 0～14 carbon atom, works as R
2During for aryl, alkaryl, aralkyl, said R
2Base contains 6～14 carbon atoms.
2. one kind according to claim 1ly prepares the method for polyester by polycarboxylic acid and polyol reaction, it is characterized in that said polyvalent alcohol is selected from a kind of polyvalent alcohol of ethylene glycol, propylene glycol, butyleneglycol, pentanediol, hexylene glycol, glycerol, TriMethylolPropane(TMP), trimethylolethane or the mixture of above-mentioned polyvalent alcohol.
3. method for preparing polyester by polycarboxylic acid and polyol reaction according to claim 1, it is characterized in that said polycarboxylic acid is selected from oxalic acid, Succinic Acid, pentanedioic acid, hexanodioic acid, pimelic acid, suberic acid, nonane diacid, sebacic acid, a kind of polycarboxylic acid of phthalic acid or the mixture of above-mentioned polycarboxylic acid.
4. one kind prepares the method for polyester according to one of claim 1～3 is described by polycarboxylic acid and polyol reaction, it is characterized in that temperature of reaction is 10～260 ℃, and the reaction times is 10～20 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97103898A CN1063195C (en) | 1997-04-09 | 1997-04-09 | Method for preparing polyester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97103898A CN1063195C (en) | 1997-04-09 | 1997-04-09 | Method for preparing polyester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1195670A CN1195670A (en) | 1998-10-14 |
| CN1063195C true CN1063195C (en) | 2001-03-14 |
Family
ID=5166968
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|---|---|---|---|
| CN97103898A Expired - Fee Related CN1063195C (en) | 1997-04-09 | 1997-04-09 | Method for preparing polyester |
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| CN (1) | CN1063195C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030134915A1 (en) * | 2001-12-17 | 2003-07-17 | Scantlebury Geoffrey Raymond | Production of transparent polyester using waste |
| CN101190964B (en) * | 2006-11-24 | 2010-08-18 | 上海涂料有限公司技术中心 | Process for preparing high-hydroxyl-value polyester resin |
| CN104592521B (en) * | 2013-10-30 | 2017-03-01 | 中国石油化工股份有限公司 | A kind of di-block aliphatic copolyester and preparation method thereof |
| CN105622905A (en) * | 2016-03-07 | 2016-06-01 | 美瑞新材料股份有限公司 | Technique for preparing polyester polyol |
| CN111961196A (en) * | 2019-05-20 | 2020-11-20 | 湖州欧美化学有限公司 | Process for preparing polymer polyols containing secondary hydroxyl end groups |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4077945A (en) * | 1974-03-23 | 1978-03-07 | Zimmer Aktiengesellschaft | Process for making linear polyesters from ethylene glycol and terephthalic acid |
| US4223124A (en) * | 1979-06-22 | 1980-09-16 | The Goodyear Tire & Rubber Company | Method for producing polyesters containing low amounts of ether by-products |
-
1997
- 1997-04-09 CN CN97103898A patent/CN1063195C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4077945A (en) * | 1974-03-23 | 1978-03-07 | Zimmer Aktiengesellschaft | Process for making linear polyesters from ethylene glycol and terephthalic acid |
| US4223124A (en) * | 1979-06-22 | 1980-09-16 | The Goodyear Tire & Rubber Company | Method for producing polyesters containing low amounts of ether by-products |
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| CN1195670A (en) | 1998-10-14 |
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