DE2043917A1 - Molding compounds and flameproof workpieces made from them - Google Patents

Description

Molding compounds and flameproof workpieces made from them, Kunstsotffe find because of their relatively low price.

their low weight and their good processability in increasing Dimensions in construction, e.g. as insulating material, for the exterior and interior of Houses or rooms.

e.g. as floor, wall or ceiling cladding and in the furniture industry wide spread. However, a major disadvantage for these areas of application is to evaluate the easy flammability of such substances. There was therefore no lack of efforts to reduce the flammability of such substances through various additives or these to make even flame-proof.

Low flammability is found in polyurethanes and epoxy resins e.g. by adding larger amounts of inorganic fillers, such as circles achieved, which, however, is an increase of weight and deterioration which means properties.

It has now surprisingly been found that the non-combustible organic substance melamine with polyurethanes and epoxy resins mixtures there that are deformable by common processing methods, e.g. pressing and with a Melamine content of 0.66 - 3 parts per part of polyurethane or Epoxy resin itself too extinguish (according to ASTM 635 - 63).

Despite the relatively low content of the plastics mentioned Such mixtures have sufficient strength for many purposes in construction. This made it possible to create a molding compound for the production of flame-resistant workpieces which are primarily for use in construction and in the field The interior decoration is suitable as it has the advantage of being flame resistant with a light weight Weight and no risk of the development of corrosive gases in the event of a fire connects, the subject of the present invention are accordingly molding compositions and from them Manufactured flame-retardant workpieces based on polyurethane and epoxy resins, characterized in that it is the reaction resin compound of the plastic, melamine and optionally contain the usual fillers, dyes and reinforcement processes, 0.66 to 3 parts of melamine are added to 1 part of reaction resin compound.

Polyurethane and epoxy resins include all commercially available plastics to understand that the characteristic urethane or. Contain epoxy groups in the NolekUl. The nature of these resins is of little influence, since the resin content compared to the Melamine ticks off.

The workpieces according to the invention can be produced simply by that one or both components of the plastic with powdered melamine in one Amount to be mixed that to 1 part reaction resin mass 0.66 bls 3 parts melamine come before the components of the plastic in those for the plastic used mixed in the usual way, if necessary with the usual fillers, dyes, Foaming agents and reinforcing fibers processed partially or fully cured will.

For example, either forms can be filled out of epoxy resin-melamine mixtures or glass fiber mats are coated, which are then passed through according to the plastic Addition of hardeners and, if necessary, hardened with heating. Will be a such mass only up to a certain degree t.B. hardened in the cold stable molding compounds that are deformed and finally hardened by the end user can be (so-called prepregs).

It is also possible to add a customary foaming agent, e.g. B. to add Frigen, so that peeled products according to the invention are obtained. the many possible uses for fillers or for heat and sound insulation own.

The molding compositions or workpieces according to the invention and their production are then described in more detail in the examples. without these examples intended to limit the invention.

Example 1: 40 parts of a commercially available polyurethane component I are mixed with 23 parts of melamine, concentrated to 7 parts of Frigen and finally nor a mixture of 48 parts of a commercially available polyurethane component II and 72 parts powdered melamine stirred in. The melamine used has a particle size distribution from 0.8%, 100 µ, 10% 100 - 60 p, 43.6% 60 - 25 and 45.6% <25 in one open Mold, this mixture foams after approx.

20 sec. To a fine-pored foam.

Flammability test according to ASTM 635 - 63 results in 1 second.

Polyurethane to melamine ratio = 1: 1.06.

Example 2: Of a type of epoxy resin such as that used for the production of metal adhesives is used, component 1 is 40 parts, component II as well 40 parts and 60 parts melamine mixed and knitted in a corresponding shape, Allowed to harden over at room temperature and demolded. The so obtained Shaped bars were tested in a firing test according to ASTM 635-63.

Burning time of the test rods produced in this way 1 second, burning time of Test rods made of the same epoxy resin without added melamine for 30 seconds.

Claims (3)

P a t e n t a n s p r ü c h e: 1. Molding compounds or flame-retardant workpieces based on polyurethanes or epoxy resins, characterized in that they are the reaction resin mass of the plastic, Melamine and optionally the usual fillers, dyes and reinforcing fibers contain, with 0.66 to 3 parts of melamine for 1 part of reaction resin compound. 2. molding compositions or flame-retardant workpieces according to claim 1, dadurhc marked that they are foamed. 3. Process for the production of molding compounds or flame-retardant workpieces according to claims 1 and 2, characterized in that one or both components of the plastic are mixed with powdered melamine in an amount that 0.66 to 3 parts of melamine come to 1 part of reaction resin compound, whereupon the components of the plastic mixed in the usual way for the plastic used, optionally with the usual fillers, dyes, foaming agents and reinforcing fibers processed and partially or fully cured.