Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1995-04-03
1998-01-06
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
264126, 521145, 521919, C08J 924
Patent
active
057055386
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to the compositions for producing foamed polyvinylchloride (PVC) materials and to the methods of their production.
It is known, that foamed PVC materials with improved physical and mechanical properties, e.g. high elasticity and thermostability, very often are multicomponent systems, including a number of specially aimed additives: foaming, stabilizing and cross-linking agents, fillers, lubricants, etc.
There is known a six-component composition for producing foamed PVC material (U.S. Pat. No. 4,434,251, C 08 J 9/10, published in 1984), consisting of PVC, plasticizer (dioctylphthalate), stabilizing agent (tribasic and dibasic lead stearate), bubble nucleation agent (calcium carbonate), cross-linking agent (triallyl isocyanurate), foaming agent (azodicarbonamide).
From this reference there is known the method of foamed material production, comprising mixing of PVC, dioctylphthalate, lead stearate, calcium carbonate, triallyl isocyanurate and azodicarbonamide on the rollers, molding the mixture at 150.degree. C. to obtain 1 mm thickness sheet material, its radiation by an electrons effluent of 6 to 10 Mrad and the following heating on wire screen at 220.degree. C. The material produced according to this method has the apparent density of 0.10-0.12 g/cu.cm, and the gel content is 28-35%.
There is known a six-component composition for producing foamed PVC material (Japanese Pat. Applic. No. 58-1729, C 08 J 9/06, published in 1983), consisting of PVC, plasticizer (esters of phthalic or phosphoric acid), stabilizing agent (organotin derivatives), cross-linking agent (trimethylol propane triacrylate, triallyl isocyanurate), foaming agent (azodicarbonamide), filler (chalk, magnesium oxide, talc).
From this reference there is known the method of foamed material production, comprising mixing of PVC, plasticizer, stabilizing agent, cross-linking agent, foaming agent and filler on the rollers at 140.degree.-165.degree. C., molding the mixture at 150.degree. C. to obtain 1 mm thickness sheet material, its radiation by an electrons effluent of 8 to 10 Mrad and the following heating on wire screen by hot air at 220.degree. C. The material produced according to this method has the apparent density of less than 0.3 g/cu.cm, and the gel content is 20-60%.
The proximate to the composition suggested, according to the technical concept, is the known two-component composition for producing foamed PVC material, this composition consists of 100 mass parts of emulsion PVC and 5-30 mass parts of polar organic liquid, in particular, the mixture of dimethyl formamide with ethylene glycol (GB Patent No. 1549949, C3C, established in 1979).
From this reference there is known the method, which is proximate to the method of the present invention according to the technical concept. This known method presents the process of foamed PVC material production comprising mixing of the powder emulsion PVC with addition of a polar liquid (the mixture of dimethyl formamide and ethylene glycol) in amount of 5-30 mass parts per 100 mass parts of PVC, molding under pressure of 1-25 MPa and heating in a high-frequency field at the rate of 190.degree. C./min. for 40 s. The obtained material has the apparent density of 0.9-1.0 g/cu.cm, the compressive strength of 8-13 MPa (without indication, what deformation limits these values are related to). Reproduction of this method showed, that the material is characterized by absence of insoluble fraction, at 50% compression deformation the material is destroyed; the material destruction rate under vacuum at 175.degree. C., which characterizes its thermostability, is 1.25.10.sup.-6 mg HCl/g PVC.s.
DESCRIPTION OF THE INVENTION
An object of this invention is to provide the foamed PVC material with improved strength and thermostability, produced on the simple composition base.
To achieve this object there is suggested the composition for producing the foamed polyvinylchoride material, consisting of polyvinylchloride and a polar compound additive, which contains suspen
REFERENCES:
patent: 3945955 (1976-03-01), Ihde, Jr.
patent: 4165415 (1979-08-01), Adachi et al.
patent: 4218553 (1980-08-01), Winter et al.
Gordeyev German Valeryevich
Kharitonov Valery Iosifovich
Kovalev Vyacheclav Nikolayevich
Morozov Igor Victorovich
Perevalov Anatoly Fyodorovich
Foelak Morton
Polimerplast
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