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Unsaturated monopol polyester foaming plastic and preparation method thereof

A technology of foamed plastics and castor oil, applied in the field of foamed plastics, can solve the problems of large amount of isocyanate, low proportion of natural vegetable oil, unfavorable for the biodegradability of foamed plastics, etc., and achieve a cost-effective effect

Inactive Publication Date: 2009-09-02
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the hydroxyl group reacts with isocyanate in a molar ratio of 1:1, the amount of isocyanate is relatively large, and the proportion of natural vegetable oil in foamed plastics is not high, which is not conducive to reducing product costs and is not conducive to the biodegradability of foamed plastics.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take 100 parts of castor oil and 26.5 parts of maleic anhydride into a four-necked flask equipped with a thermometer, mechanical stirring and reflux condenser, heat the oil bath to 120°C for 6 hours, and measure the acid value of the reaction system to be 118mgKOH / g. Stop heating, allow reaction product to cool to room temperature naturally, obtain maleic anhydride modified castor oil resin. Its apparent viscosity measured at 30°C is 6850mPa.s.

Embodiment 2

[0035] Take 100 parts of castor oil, 26.5 parts of maleic anhydride, and 0.2 parts of N, N dimethylbenzylamine, add them to a four-neck flask equipped with a thermometer, mechanical stirring and a reflux condenser, heat the oil bath to 90°C for 9 hours, The acid value of the reaction system was measured to be 115 mgKOH / g, the heating was stopped, and the reaction product was naturally cooled to room temperature to obtain a maleic anhydride-modified castor oil resin. Its apparent viscosity measured at 30°C is 4850mPa.s.

Embodiment 3

[0037] Take 100 parts of hydroxyethyl acrylate, 84.5 parts of maleic anhydride, and 0.369 parts of hydroquinone, and put them into a three-necked flask equipped with a thermometer, mechanical stirring and reflux condenser, and heat the oil bath to 90°C for 6 hours. The maleic acid half ester was obtained, and the acid value of the product was 290 mgKOH / g.

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PUM

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Abstract

The invention discloses a castor oil unsaturated polyester foam plastic and a preparation method thereof. It is obtained by reacting the following components in parts by weight: modified castor oil resin 100, vinyl monomer 5-60, foaming agent 1-15, foam stabilizer 0.5-5, initiator 0.5-10, accelerator 0 ~10, water 0~15, crosslinking monomer 0~5. The present invention introduces active double bonds on the molecular chain of castor oil, and the modified castor oil containing active double bonds has similar properties to traditional unsaturated polyester resins, and castor oil unsaturated polyester foams can be prepared, and the foams have Fully biodegradable. The foamed plastic prepared by the present invention has higher cost performance, the density is between 0.1g / cm3 and 0.4g / cm3, and the compressive strength is between 10kPa and 900kPa at 25% strain, and has the characteristics of flexible or semi-rigid foamed plastics , can be used for packaging materials, furniture materials or as automobile shock-absorbing foam plastics, etc.

Description

technical field [0001] The invention relates to a foamed plastic, in particular to a castor oil unsaturated polyester foamed plastic and a preparation method thereof. technical background [0002] As an important polymer material, foam plastic has been widely used in various fields such as packaging, electrical appliances, furniture, and automobiles. Traditional foam plastics are mostly prepared with petroleum-based products as the main raw materials, which are difficult to degrade under natural conditions and are one of the main causes of white pollution. For this reason, replacing petroleum-based foams with biodegradable foams is a future development trend. In recent years, there have been many studies on the preparation of polymer materials by using vegetable oil instead of some petroleum raw materials. Among them, the method of preparing degradable foam plastics with vegetable oil (such as castor oil and soybean oil, etc.) as the main raw material provides a feasible wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/08C08J9/00C08K5/43C08K5/14C08K3/26
Inventor 容敏智王红娟章明秋
Owner SUN YAT SEN UNIV