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Cross-linked polyvinyl chloride structure foam material and preparation method thereof

A technology for cross-linking polyvinyl chloride and foam materials, applied in the field of foam materials, can solve the problems of nucleating agent residue, limited fusion degree, affecting material properties, etc., and achieves lower thermal stability requirements, lower overall process energy consumption, The effect of shortening the heat time at high temperature

Active Publication Date: 2021-07-02
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although low-boiling organic small molecules such as cyclopentane can be used as blowing agents to replace azobisisobutyronitrile to prepare cross-linked PVC structural foams, or add expanded microspheres in the formula to reduce the amount of AIBN and the foaming pressure; but for Foaming process requirements are still high
[0005] Azodicarbonamide (AC) is generally used as a nucleating agent in the preparation of cross-linked polyvinyl chloride structural foam in the prior art, but the nucleating agent will remain in the system, which does not meet environmental protection requirements, and sodium bicarbonate and potassium bicarbonate are used Instead of AC, it is impossible to achieve a good dispersion of the nucleating agent in the system, which will eventually affect the nucleating efficiency of the nucleating agent and the uniformity of the cell structure
[0006] In the prior art, when preparing cross-linked polyvinyl chloride structural foam, it is required that the mixed material be heated to 170-175°C in the mold, and keep enough time to complete the plasticization of the core material of the mold, and then lower it to room temperature to open the mold. In actual production There is a process of repeated heating and cooling in the system, which consumes a lot of energy, and the high temperature for a long time puts forward higher requirements on the thermal stability of the system, which limits the adjustment of the formula
In addition, when the mixture is heated in the mold, only the liquid component penetrates into the PVC resin particles, so the degree of fusion between the components will be limited, which will affect the final performance of the material

Method used

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  • Cross-linked polyvinyl chloride structure foam material and preparation method thereof
  • Cross-linked polyvinyl chloride structure foam material and preparation method thereof
  • Cross-linked polyvinyl chloride structure foam material and preparation method thereof

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preparation example Construction

[0029] The invention provides a method for preparing a cross-linked polyvinyl chloride structural foam material, comprising:

[0030] Melting and mixing polyvinyl chloride resin, modified resin, isocyanate, acid anhydride, nucleating agent and heat stabilizer to obtain a blank;

[0031] immersing the blank in foaming gas for foaming to obtain a foam;

[0032] The foam is cross-linked and solidified to obtain a cross-linked polyvinyl chloride structural foam material.

[0033] In the prior art, PVC resin (polyvinyl chloride resin, also known as PVC paste resin) produced by emulsion polymerization process is generally used as one of the main raw materials to prepare cross-linked polyvinyl chloride structural foam. Compared with PVC paste resin, loose PVC resin (also known as PVC suspension resin) produced by suspension polymerization process has the advantage of low cost. The polyvinyl chloride resin used in the preparation of cross-linked polyvinyl chloride structural foam in...

Embodiment 1

[0067] Melt and mix 100g PVC resin (paste resin), 60g PMDI, 30g MHHPA, 2.0g calcined kaolin, and 2g calcium stearate at 150°C to obtain a 6mm thick blank; then put the blank into a sealed cavity at 90°C , put in carbon dioxide to raise the pressure to 10MPa, hold the pressure for 120min, discharge the carbon dioxide, and obtain a primary foam; soak the primary foam in hot water at 90°C for secondary expansion for 6 minutes, and obtain a secondary foam; The secondary foam was placed in saturated water vapor at 60° C. for 4 days for cross-linking and curing to obtain a cross-linked PVC structural foam material.

[0068] According to the method of comparative example 1, the cross-linked PVC structural foam prepared by the embodiment of the present invention 1 is detected, and the detection results are as follows: image 3 Shown, the density of the foam material that embodiment 1 prepares is 70kg / cm 3 , the average cell size is about 90 μm.

[0069] According to the method for c...

Embodiment 2

[0072] Melt 100g of PVC resin, 30g of PMMA (polymethyl methacrylate), 100g of TDI, 60g of PA, 0.6g of calcium stearate, 0.4g of zinc stearate, 1.0g of nano-silica, and 0.5g of molecular sieve at 150°C Mix to obtain a blank with a thickness of 6mm; put the blank into a sealed cavity at 125°C, introduce carbon dioxide to increase the pressure to 6MPa, keep the pressure for 120min, and discharge the carbon dioxide to obtain a PVC primary foam; soak the primary foam Perform secondary expansion in hot water at 95°C for 30 minutes to obtain a secondary foam; place the secondary foam in hot water at 40°C for cross-linking and curing for 6 days to obtain a cross-linked PVC structural foam material.

[0073] According to the method of comparative example 1, the cross-linked PVC structural foam prepared by the embodiment of the present invention 2 is detected, and the density of the foam material is 50kg / cm 3 , the average cell size is about 95 μm, and the glass transition temperature o...

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Abstract

The invention provides a method for preparing a cross-linked polyvinyl chloride structure foam material by using a physical foaming agent, which comprises the following steps: melting and mixing polyvinyl chloride resin, modified resin, isocyanate, anhydride, a nucleating agent and a heat stabilizer to obtain a blank; soaking the blank in foaming gas to be foamed, and obtaining a foaming body; and carrying out cross-linking curing on the foaming body to obtain the cross-linked polyvinyl chloride structure foam material. The cross-linked polyvinyl chloride structural foam material is prepared by adopting a brand new process route, and the adjustable range of the composition and proportion of the PVC resin and other raw materials is large; carbon dioxide or nitrogen is adopted for foaming, the PVC foam preparation process can be safer and more environmentally friendly, and the cost can be reduced; the foam material prepared by the invention has high glass transition temperature and good heat resistance; according to the preparation process disclosed by the invention, the compatibility or intersolubility of PVC and other raw materials is improved, and the material performance is better. The invention also provides a cross-linked polyvinyl chloride structural foam material.

Description

technical field [0001] The invention belongs to the technical field of foam materials, and in particular relates to a cross-linked polyvinyl chloride structural foam material and a preparation method thereof. Background technique [0002] Foam sandwich structure composite material is a sandwich structure material that uses resin-based composite material as the skin and polymer foam as the core material. Because of its high strength, light weight, high rigidity, corrosion resistance, electrical insulation, microwave permeability It is more and more widely used in special-shaped parts such as missile wings, helicopter sidewall panels, and wind rotor blades in the aerospace industry due to its excellent characteristics. The foam core materials currently used as sandwich structures mainly include cross-linked polyvinyl chloride (PVC) structural foam, polystyrene (PS), polyurethane (PUF), acrylonitrile-styrene (SAN), polyetherimide (PEI) and polymethacrylimide (PMI) and other fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08L33/12C08L33/08C08L25/12C08L23/28C08L75/04C08L27/24C08K3/34C08K5/098C08K3/36C08K7/24C08K3/40C08K5/29C08K5/1539C08K13/02C08K3/26C08J9/12
CPCC08J9/122C08J9/0095C08J9/0066C08J9/0071C08J9/0061C08J9/0023C08J9/0028C08J2327/06C08J2433/12C08J2433/08C08J2425/12C08J2423/28C08J2475/04C08J2427/24C08K3/346C08K5/098C08K3/36C08K7/24C08K3/40C08K13/02C08K3/34C08K5/29C08K5/1539C08J2203/06C08K2201/011C08K2003/265Y02P70/50C08J2201/026C08J2201/032C08L27/06C08K5/09C08L2205/02C08L2205/03C08K5/0025C08L33/12C08L25/12C08L23/286C08L27/24C08L75/04C08J2205/10C08K5/315C08L2201/08C08L2205/24C08L2312/00
Inventor 唐涛游江岸姜治伟薛俭蒋汉卿邱健邢海平李明罡
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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