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PVC structural foam and preparation method thereof

A PVC resin and foam technology, applied in the field of structural foam, can solve the problems of limited addition and compatibility, unable to meet the requirements of use, etc., to ensure uniformity and compatibility, increase the difficulty of heat-resistant modification, and fine cells. uniform effect

Active Publication Date: 2020-04-10
FSPG HI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methods used in the prior art include adding reinforcing modifiers, adding sensitizers containing rigid structures (such as Chinese patent 201210491495.3), and subsequent silane coupling agent treatment for secondary crosslinking. The amount of addition and its compatibility with PVC resin is limited. It can only improve the mechanical properties and heat resistance of the foam to a certain extent, but it still cannot meet the requirements of high-end products such as wind turbine blades.

Method used

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  • PVC structural foam and preparation method thereof
  • PVC structural foam and preparation method thereof
  • PVC structural foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The PVC structural foam of this embodiment raw material components and proportioning are as follows in parts by weight:

[0028]

[0029] Preparation:

[0030] 1) First mix the epoxy resin SH-E50 with an epoxy value of 0.12 and the epoxy curing agent dicyandiamide according to the weight of the raw materials, and then mix them with the PVC resin evenly, then put in other raw material components in turn, and stir at a high speed to 100 After stirring at a low speed to 40°C, then kneading, pressing, and cooling in an open mill at 130°C to obtain a semi-finished plate;

[0031] 2) The semi-finished board obtained in step 1) was irradiated with a cobalt source for 14kGy, then foamed with hot air at 175°C for 30 minutes, cooled and shaped, and the finished PVC structural foam of Example 1 was prepared.

[0032] After testing, the compressive strength of the finished product of Example 1 is 1.07MPa, the Martin heat resistance temperature is 90.5°C, and the water absorptio...

Embodiment 2

[0056] The PVC structural foam of this embodiment raw material components and proportioning are as follows in parts by weight:

[0057]

[0058] Preparation:

[0059] 1) First mix the epoxy resin with an epoxy value of 0.05 and the SH-201 curing agent evenly with the PVC resin according to the weight of the raw materials, and then put in other raw material components in turn, stir at high speed to 100°C, and then turn to low speed stirring to 40°C, and then kneaded, pressed and formed, and cooled by an open mill at 145°C to obtain a semi-finished plate;

[0060] 2) The semi-finished board obtained in step 1) was irradiated with cobalt source 4kGy, then molded and foamed at 200°C and 11MPa for 13min, cooled and shaped, and the finished PVC structural foam of Example 2 was prepared.

[0061] After testing, the compressive strength of the finished product of Example 2 is 1.16MPa, the Martin heat resistance temperature is 91.8°C, and the water absorption rate is 1.3%.

Embodiment 3

[0063] The PVC structural foam of this embodiment raw material components and proportioning are as follows in parts by weight:

[0064]

[0065]

[0066] Preparation:

[0067] 1) Mix the epoxy resin E51 and the SH-201 curing agent evenly according to the weight of the raw materials, and then mix them evenly with the PVC resin, then put in other raw material components in turn, stir at a high speed to 100°C, then turn to a low speed to 40°C, and then After kneading by a 120°C open mill, molding and pressing out the sheet, the semi-finished sheet is obtained;

[0068] 2) The semi-finished board obtained in step 1) was irradiated with a cobalt source of 80 kGy, then molded and foamed at 210° C. and 10 MPa for 4 minutes, cooled and shaped, and the finished PVC structural foam of Example 3 was prepared.

[0069] After testing, the compressive strength of the finished product of Example 3 is 1.80 MPa, the Martin heat resistance temperature is 98.5° C., and the water absorptio...

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Abstract

The invention discloses PVC structural foam which comprises the following raw material components in parts by weight: 100 parts of PVC resin, 5-80 parts of epoxy resin, 0.4-24 parts of an epoxy curingagent, 5-20 parts of a foaming agent, 3-20 parts of a sensitizer, 1-8 parts of a stabilizer and 5-15 parts of a processing aid. Through special setting of the raw material components and the ratio, an epoxy resin crosslinking system is introduced, and after irradiation foaming, a double-crosslinking system with two interpenetrated resin systems with a PVC resin crosslinking system is formed; on the basis of ensuring the uniformity of the PVC crosslinking system and obtaining foam with fine and uniform cells, high closed-cell rate and low water absorption, the rigidity of a crosslinking structure is enhanced by utilizing an epoxy resin system, and the crosslinking density and the crosslinking strength of the whole system are greatly improved, so that the mechanical property and the heat resistance of the prepared structural foam are greatly improved. The invention also discloses a preparation method for the PVC structural foam.

Description

technical field [0001] The invention relates to the field of structural foam, in particular to a PVC structural foam. Background technique [0002] The sandwich structure composite material with PVC structural foam as the core material has the characteristics of high strength and light weight, and can be widely used in wind power generation, ships, aerospace, rail transit and other fields that have high requirements for strength and weight reduction, and can solve The above fields have requirements for weight reduction and energy saving. To prepare rigid PVC foam with high expansion ratio, it is necessary to solve the problem that the melt strength of PVC is too low at high temperature (when foaming), and the two contradictory performance requirements of low density and high strength are often the most difficult to solve for structural foam. The problem. In order to solve the problems of low melt strength and high expansion ratio of PVC and realize light weight and high st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08L63/00C08L63/02C08L91/06C08K13/02C08K3/26C08K3/22C08K5/09C08K5/21C08K5/12C08K13/04C08K7/26C08J9/10C08J3/24
CPCC08J3/246C08J9/0023C08J9/0028C08J9/0066C08J9/103C08J9/105C08J2203/18C08J2327/06C08J2463/00C08J2463/02C08K5/09C08K5/12C08K5/21C08K7/26C08K13/02C08K13/04C08K2003/2296C08K2003/265
Inventor 谢映雪刘芳何经纬李永鸿李爽招炳健
Owner FSPG HI TECH
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