Crosslinked polyvinyl chloride foam and preparation method thereof
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A technology of cross-linked polyvinyl chloride and polyvinyl chloride, which is applied in the field of foam materials, can solve problems such as cumbersome operation, and achieve the effects of improving thermal stability and toughness, good dimensional stability and solvent resistance
Active Publication Date: 2012-03-28
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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However, the acid anhydrides used in the above method are all solid or viscous liquid, so that the materials must be refined before mixing, and the operation is cumbersome.
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[0072] The present invention also provides a kind of preparation method of cross-linked polyvinyl chloride foam, comprises the following steps:
[0073] Foaming and molding a polyvinyl chloride mixture, the polyvinyl chloride mixture comprising:
[0074] The polyvinyl chloride resin of 100 weight parts;
[0075] 30-150 parts by weight of isocyanate;
[0076] 1~15 parts by weight of foaming agent;
[0077] 1 to 30 parts by weight of a compound of formula (I):
[0078]
[0079] Among them, R 1 is a hydrocarbon group, a substituted hydrocarbon group, an ester group, a carbonyl group, an ether group or an amide group, R 2 is H, aliphatic, phenyl, nitro, cyano or halogen;
[0080] The foamed molded product is subjected to secondary foaming and curing in water or water vapor to obtain cross-linked polyvinyl chloride foam.
[0081] The present invention uses a polyvinyl chloride mixture comprising polyvinyl chloride resin, isocyanate, blowing agent and a compound having the ...
Embodiment 1
[0100] Mix 600g of PVC resin, 120g of GMA, 600g of liquefied MDI and 60g of AIBN evenly, add them into the mold, perform foaming and molding at a temperature of 175°C and a pressure of 16MPa, cool to 40°C and open the mold, and place the foamed molded product at 85 ℃ hot water for secondary foaming, and then placed in 65 ℃ water vapor for curing and setting to obtain cross-linked PVC foam, its performance is shown in Table 1, Table 1 is the performance of the cross-linked PVC foam prepared in Examples 1-10 surface.
Embodiment 2
[0102] Mix 600g of PVC resin, 180g of GA, 180g of TDI, 30g of styrene, 30g of vinylpyridine, 60g of AIBN and 30g of AC, and add them into the mold, foam and press at a temperature of 171°C and a pressure of 15MPa, cool to 20°C and open the mold. The foamed molded product obtained was placed in 95°C water vapor for secondary foaming, and then placed in 55°C hot water for curing and setting to obtain a cross-linked PVC foam, whose properties are shown in Table 1.
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Abstract
The invention provides crosslinked polyvinyl chloride foam. The crosslinked polyvinyl chloride foam is prepared by foaming a polyvinyl chloride mixture, wherein the polyvinyl chloride mixture comprises 100 weight parts of polyvinyl chloride resin, 30 to 150 weight parts of isocyanate, 1 to 15 weight parts of foaming agent and 1 to 30 weight parts of compound with a structure shown as a formula (I); R1 is hydrocarbyl, substituted hydrocarbyl, ester, carbonyl, ether or acylamino; and R2 is H, fat hydrocarbyl, phenyl, nitryl, cyan or halogen. The invention also provides a preparation method for the crosslinked polyvinyl chloride foam. The preparation method comprises the following steps of: foaming and die-pressing the polyvinyl chloride mixture to obtain a foaming die-pressing substance; and performing secondary foaming and solidification on the foaming die-pressing substance in water or water vapor to obtain the crosslinked polyvinyl chloride foam. The crosslinked polyvinyl chloride foam has high dimensional stability and solvent resistance; and the preparation method is easy and convenient to operate and favorable for industrialized production.
Description
technical field [0001] The invention relates to the technical field of foam materials, in particular to a cross-linked polyvinyl chloride foam and a preparation method thereof. Background technique [0002] Foam sandwich structure composite materials are generally composed of skin and foam core materials. Because of their high strength, light weight, high rigidity, corrosion resistance, electrical insulation and microwave permeability, they are widely used in missile wings and helicopter side walls. In the field of processing airfoils such as plates and wind rotor blades. At present, the main materials used as foam core materials are cross-linked polyvinyl chloride (cross-linked PVC), polystyrene (PS), polyurethane (PUR), acrylonitrile-styrene copolymer (SAN), polyetherimide (PEI) and polymethacrylimide (PMI) and other foams, among which, cross-linked polyvinyl chloride foam is obtained due to its stable performance, uniform texture, good dynamic and static properties, and ...
Claims
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