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Rigid PVC foam plastic manufactured by twin-screw extruder and preparation method thereof

A twin-screw extruder, foamed plastic technology, applied in the field of rigid PVC foamed plastics and its preparation, can solve the problems of low efficiency and incapable of continuous production, achieve good thermal insulation performance and flame retardant performance, simplify the production process, shorten the The effect of production time

Inactive Publication Date: 2019-06-07
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method cannot be produced continuously, and the efficiency is relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 100 grams of PVC, 3 grams of foaming agent, and 10 grams of foaming regulator, use a disperser to disperse evenly, and then pour it into a mixer. Then add 3 grams of stabilizer, 75 grams of polymethylene polyphenyl polyisocyanate, 30 grams of anhydride, 1.5 grams of soybean oil, 1.5 grams of foam stabilizer, and the mixer speed is 600r / min and stirs for 10 minutes, and the resulting mixture into a twin-screw extruder. The pre-foam extruded from the extruder was placed in water at 92° C. for 30 minutes to obtain the final product.

[0024] The final density of the product can be reduced to 60kg / m 3 .

Embodiment 2

[0026] Take 100 grams of PVC, 3 grams of foaming agent, and 8 grams of foaming regulator, use a disperser to disperse evenly, and then pour it into a mixer. Then add 3 grams of stabilizer, 80 grams of polymethylene polyphenyl polyisocyanate, 30 grams of anhydride, 1.5 grams of soybean oil, 1.5 grams of foam stabilizer, and the mixer speed is 600r / min and stirs for 10 minutes, and the resulting mixture Add to extruder. The pre-foam extruded from the extruder was placed in water at 88° C. for 20 minutes to obtain the final product.

[0027] The final density of the product can be reduced to 80kg / m 3 .

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Abstract

The invention belongs to the technical field of PVC materials, in particular to a rigid PVC foam plastic manufactured by a twin-screw extruder and a preparation method thereof. The preparation methodcomprises the following steps: evenly mixing raw materials in a certain proportion by an extruder, performing extrusion molding by the twin-screw extruder to obtain a rigid plastic foam pre-foaming body, boiling the obtained pre-foaming body, and performing solidification shaping to obtain the final rigid plastic foam. The rigid PVC foam manufactured by the twin-screw extruder and the preparationmethod thereof can be continuously produced, so that the production time is greatly shortened, the production process is simplified, and the production efficiency is improved. The produced rigid cross-linked PVC foam plastic has compact bubble holes, and relatively good thermal insulation performance and flame resistance.

Description

technical field [0001] The invention belongs to the technical field of PVC materials, and in particular relates to a rigid PVC foam produced by a twin-screw extruder and a preparation method thereof. Background technique [0002] Polyvinyl chloride is one of the five general-purpose plastics, and its annual consumption is huge. With the development of foam technology, people's requirements for foam performance are getting higher and higher. However, the heat distortion temperature of conventional rigid polyvinyl chloride foam is low, so the application of rigid polyvinyl chloride foam is hindered to a certain extent. [0003] Depending on the state of the substance, there are three types of blowing agents: solid, liquid, and gas. According to the different ways of generating gas in the foaming process, it is generally divided into two categories: chemical foaming agent and physical foaming agent. The physical foaming agent is a substance that is easy to gasify. Under the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08L91/00C08K5/29C08K5/1539C08J9/32C08J9/10
Inventor 杜程陈骁翰陈弦谭东
Owner SICHUAN UNIV
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