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PVA foaming material and foaming method thereof

A foaming material and foaming agent technology, applied in the field of foaming materials, can solve the problems of PVA gasification, high production cost, complicated process, etc., and achieve the effects of high compressive strength, light weight and simple operation process

Inactive Publication Date: 2020-01-10
SRJJ LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the disadvantages of compression molding are high production cost, complex process and long cycle, and because the melting point and boiling point of PVA material itself are very close, it is difficult to thermoplastic molding, which is a difficulty in realizing continuous extrusion foaming, because the traditional molten state The foaming process that introduces gas under the environment, its processing temperature is 20-30 ℃ or higher above the melting point, so it is not suitable for PVA, and the high temperature will easily lead to PVA gasification

Method used

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  • PVA foaming material and foaming method thereof
  • PVA foaming material and foaming method thereof
  • PVA foaming material and foaming method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] First, prepare three groups of raw materials according to the following table, and prepare three groups of foaming samples:

[0013]

[0014]

[0015] Then, prepare three groups of foaming samples V20, V21 and V22 according to the following procedure: take PVA resin and deionized water, stir the mixture in a 90°C water bath for 2 hours, add foaming agent to the above mixture, and stir well . The temperature of the single-screw extruder is 80-100-105-110°C, the screw speed is 100rpm, and then the uniform solution is added to the single-screw extruder for pre-foaming. After pre-foaming, weigh 350g of pre-foaming samples and add Put the mold into a 200x200x23mm mold for the second foaming, then put the mold in a hot press at 100°C / 2 minutes, and finally put the mold in an oven at 60°C / 12 hours to get foamed V20, V21 and V22 PVA samples.

[0016] The solubility of described PVA resin provided by SRJJ company is the PVA resin of W grade; Foaming agent 031DU40 powder ...

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Abstract

The invention discloses a PVA foaming material and a foaming method thereof. The foaming material is provided to overcome the difficulty of continuous extrusion foaming of existing. The hydrolytic characteristic of the PVA is utilized to make the PVA foamed at a temperature lower than the boiling point of PVA in a hydrolytic swelling state. Water is used as a medium, a micro-porous expansion foaming agent is added in a swelling state, and foaming is carried out at the temperature below the boiling point of the PVA, so that PVA gasification is avoided, extrusion molding is realized, and the operation process is simple; and a prepared finished product has the advantages of light weight (low density), high compressive strength (reaching up to 259 KPa), high degradable component content and environmental friendliness.

Description

technical field [0001] The invention relates to a foaming material, in particular to a PVA foaming material and a foaming method thereof. Background technique [0002] Foamed polyvinyl alcohol (PVA) is an environmentally friendly foamed plastic. Traditional foamed plastics may pollute the environment during use because they cannot be degraded. In some fields, it has been clearly prohibited to use. Foamed PVA is a biodegradable polymer material in the natural environment, and PVA itself contains hydroxyl groups and open-pore structure, so it has excellent water absorption performance, hard and high strength in dry state, and good flexibility in wet state , are widely used in many fields. The preparation of PVA foam mainly includes extrusion molding and compression molding, and the methods of foaming generally include chemical foaming method, physical foaming method and mechanical foaming method. Among them, the disadvantages of compression molding are high production cost, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/32C08L29/04
CPCC08J9/32C08J2329/04C08J2203/22C08J2205/044
Inventor 陈奕辉
Owner SRJJ LTD
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