Fine-cell polyvinyl chloride foam material and preparation method thereof

A polyvinyl chloride foam and foam material technology, applied in the field of foam materials, can solve the problems of easy degradation and gelatinization of the board core, long steam curing time, unevenness, etc., and achieve shortened steam treatment time, light weight and good uniformity. Effect

CN107698889AActive Publication Date: 2018-02-16CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-02-16

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Abstract

Belonging to the technical field of foam materials, the invention provides a fine-pore polyvinyl chloride foam material and a preparation method thereof. The invention solves the technical problems oflarge and uneven cells of cross-linked rigid polyvinyl chloride foams, easy degradation and gelatinization of plate core, and long steam curing time and low efficiency of preparation method in the prior art. The foam material provided by the invention comprises 100 parts by weight of polyvinyl chloride resin, 0-80 parts by weight of anhydride, 0-20 parts by weight of an epoxy compound, 30-150 parts by weight of isocyanate, 5-20 parts by weight of a foaming agent 1, 0-5 parts by weight of a foaming agent 2, 2-20 parts by weight of a foaming agent 3, 0-4 parts by weight of a catalyst, 0-3 partsby weight of a surfactant and 5-20 parts by weight of a thermal stabilizer, and the cell diameter of the foam material is 300microm-100microm. The foam material can reduce the cell diameter of foam material, lower the absorption of resin in a composite material preparation process, reduce the product weight, and avoid plate core degradation and gelatinization.
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Description

technical field

[0001] The invention belongs to the technical field of foam materials, and in particular relates to a fine-pore polyvinyl chloride foam material and a preparation method thereof. Background technique

[0002] Polyvinyl chloride, referred to as PVC (Polyvinyl chloride) in English, is a polymer formed by polymerization of vinyl chloride monomers in peroxides, azo compounds and other initiators, or under the action of light and heat, according to the mechanism of free radical polymerization. Polyvinyl chloride foam material is a foam material made of polyvinyl chloride resin as the main body, adding foaming agent and other additives. Polyvinyl chloride foam materials are divided into two types: hard and soft. Rigid PVC foam materials generally have a relatively large elastic modulus, no flexibility, and high compressive strength. When the stress reaches a certain value, deformation can occur, and it cannot be restored after the stress is released. undisturbed. ...

Examples

preparation example Construction

[0050] The preparation method of above-mentioned microporous polyvinyl chloride foam material, the steps are as follows:

[0051] When the polyvinyl chloride resin is a paste resin, the first step is: weigh various materials according to the proportion, mix them evenly to obtain a paste material, add the paste material into the mold, close the mold, the molding temperature is 150-200°C, and press The pressure is 11-30MPa, the molding time is 30-50s / mm, cooled to 25-100°C, and the mold is opened to obtain a foamed molded product;

[0052] When the polyvinyl chloride resin is a suspension resin or a mixture of suspension resin and paste resin, step 1 is: weigh various materials according to the proportion, mix them evenly to obtain suspension materials, add the suspension materials to the mold, and close the mold, 50-110 After preheating at ℃ for 5-30 minutes, heat until the molding temperature is 150-200℃, pressurize until the molding pressure is 11-30MPa, the molding time is 3...

Embodiment 1

[0070] The fine-pore polyvinyl chloride foam material is composed of 100 parts by weight of PVC paste resin, 5 parts by weight of bisphenol A glycidyl ether, 60 parts by weight of PMDI, 10 parts by weight of azobisisobutyronitrile and 4 parts by weight of sodium bicarbonate.

[0071] The preparation method of above-mentioned microporous polyvinyl chloride foam material:

[0072] First weigh the above-mentioned materials according to the proportion, mix them evenly, add them into a mold with a cavity of 22 mm in thickness, carry out foaming and molding at a temperature of 170°C and a pressure of 16MPa, keep warm for 11 minutes, cool to 80°C and open the mold to obtain Foam moldings;

[0073] Then the foamed molded product obtained was placed in hot water at 95°C for secondary foaming for 40 minutes, and finally placed in saturated water vapor at 65°C for 2 days for crosslinking, and the cell diameter of the obtained foam was 250 μm.

[0074] Figure 4 Be the scanning electron...

Embodiment 2

[0076] Fine cell polyvinyl chloride foam material, by 100 weight parts polyvinyl chloride paste resin, 10 weight parts acid anhydride phthalic anhydride, 5 weight parts trimethylolpropane glycidyl ether, 45 weight parts toluene diisocyanate (TDI), 7 parts by weight of azobisisobutyronitrile, 0.5 parts by weight of azodicarbonamide, 4 parts by weight of potassium bicarbonate, 1 part by weight of sodium bicarbonate, 0.5 parts by weight of N', N", N"'-tri(two methylaminopropyl) symmetrical hexahydrotriazine, 3 parts by weight of water-soluble silicone oil and 5 parts by weight of organotin 181.

[0077] The preparation method of above-mentioned microporous polyvinyl chloride foam material:

[0078] First weigh the above-mentioned materials according to the proportion, mix them evenly, and get the paste material, put the paste material into the mold, close the mold, the molding temperature is 150°C, the molding pressure is 30MPa, the molding time is 50s / mm, and cooled to 25°C, op...