Composition for coating, sealing, and protecting purposes

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

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Details

427421, 427422, 523434, 524437, 524450, 524507, 525111, 525123, B05D 102, C08K 322, C08K 334, C08L 7504

Patent

active

048661163

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a composition for coating, tightening, and protecting purposes, a process for its preparation, as well as a process for its application.
The object of the present invention is to obtain a composition, which can be used as a coating of surfaces, which are subject to corrosion, and mechanical attacks; as a sealing agent for water and other liquids at tube joints, roofing, point-sealing of ceramic tiles, metal sheets, and the like, and which composition is very resistant to mechanical wear and attacks by chemicals including water.


BACKGROUND OF THE INVENTION.

SE-A-7709649-3 describes a corrosion resistant coating composition, particularly for external rust protection of vehicle chassies, which composition consists of a polyurethane polymer, waste rubber, water free black coal tar, zeolitic drying agent. This composition fulfills generally its object, but has some disadvantages by strongly smelling of black coal tar, which prevents it from being used in more restricted spaces, and means that well ventilated spaces are required for application, as well. Further, the black coal tar leads to the fact that the coating obtains a black colour, which often may not be of importance, but as often is not acceptable, therefore one demands in stead a pigmented product with a colour pigment by choice. Besides these drawbacks, which are of a certain cosmetic nature, one often requires a still higher wearing resistance, resistance against attach by chemicals, particularly in alkaline environment, and temperature stability.


DESCRIPTION OF THE PRESENT INVENTION

It has now surprisingly been shown possible to be able to eliminate these problems by the present invention, which is characterized in that it contains rubber with a particle size of at most 0.4 mm, and present in an amount of at most 50% by weight, and an isocyanate curable polymer base of the polyhydroxy type in an amount of 40-55% by weight, a polymer curing isocyanate in an amount of 18-30% by weight, and an aliphatic polyether glycol in an amount of 1 to 5% by weight.
Further characteristics are evident from the accompanying claims.
The curable prepolymer is preferably an isocyanate curable polyurethane (DESMODUR-hardener; DESMOPHEN 1150-prepolymer) but also isocyanate curable epoxy polymers can be used.
Suitable binding agents of polymer type which are curable by isocyanate active hardeners are different polyols, polyester bases, having a molecular weight of 200 and more. Other polymer materials are epoxy resins which are primarily dissolved in a keton, or a glycol ether, and are then cured using an isocyanate active hardener (e.g., DESMODUR) or amino group active hardener. Suitable epoxy resins have a molecular weight of 1000 or more.
The polyols used can either be agents, such as DESMOPHEN 1150, or the like, and/or aliphatic glycols, such as ethylene glycol, diethylene glycol, triethylene glycol.
All types of rubber can be used as a rubber material, such as waste rubber, waste rubber tires, raw rubber, and other rubber qualities.
Thus it has turned out that 20-40% by weight of rubber powder, suitably waste rubber, having a particle size of <0.4 mm, preferably 0.05-0.2 mm, 40-50% by weight of a polymer base, 1-5% by weight of an aliphatic polyether glycol base, and 18-25% by weight of an isocyanate hardener give excellent products within the scope of the present invention. Thus these compositions have, in cured state, a very high elasticity, and wearing resistance. In the case the polyester base contains moisture a zeolite drying agent should be added, alternatively active aluminium oxide, or basic aluminium silicates.


EXAMPLE 1.

40 parts per weight of waste rubber having a particle size of 0.1-0.2 mm were immediately mixed with a mixture of 40 parts per weight of DESMOPHEN 1150, and 2 parts per weight of polyether glycol (triethylene glycol). To this comixture then 18 parts per weight of an isocyanate active hardener (DESMODUR) were added for the curing of the polymers. The composition prepared was us

REFERENCES:
patent: 2998403 (1961-08-01), Miller et al.
patent: 3245946 (1966-04-01), O'Conner et al.
patent: 3271352 (1966-09-01), Weinberg
patent: 4165344 (1979-08-01), Okuaa et al.
patent: 4292213 (1981-09-01), Elliott et al.
patent: 4489177 (1984-12-01), O'Conner et al.
patent: 4657953 (1987-04-01), Kajo et al.
Derwent'Abstract, No. 83-787 501/41, SU 979 481 A, see lines 1-5 and 15.

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