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Low-pressure SMC combined thickening agent and method for preparing same

A sheet molding compound and thickening agent technology, applied in the field of materials, can solve the problems of difficult continuous chemical thickening process, serious separation of resin and fiber, and difficult to control resin flow, and achieves excellent membrane separability, suitable for The effect of industrial production and easy operation

Inactive Publication Date: 2006-03-15
山东海博新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the price of alkaline earth metal oxide thickener is low, its thickening speed is slow, and its particle size, dispersibility, activity and other factors also have a great influence on the thickening performance of the resin, resulting in unstable thickening effect
In addition, the chemical thickening process with magnesium oxide is difficult to carry out continuously, and the flow of resin in the cavity is difficult to control
After the molding material is produced, the separation of resin and fiber is serious, and it is not easy to release the film and handle it

Method used

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  • Low-pressure SMC combined thickening agent and method for preparing same
  • Low-pressure SMC combined thickening agent and method for preparing same

Examples

Experimental program
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Effect test

preparation example Construction

[0019] 2. Preparation of low-pressure SMC joint thickener

[0020] 1. Preparation of low-pressure SMC joint thickener:

[0021] Firstly weigh the liquid crystal polyester resin, diisocyanate compound, alkaline earth metal oxide or alkaline earth metal hydroxide with a melting point of 60-77°C according to the formula of low-pressure SMC joint thickener (see attached table 1), and then, after mixing It can be made into a low-pressure SMC joint thickener.

specific example

[0023] Take 65 parts of liquid crystal polyester resin, 30 parts of 4,4-diphenylmethane diisocyanate, and 5 parts of magnesium oxide, and mix them to form a combined thickening resin.

[0024] 2. Preparation steps of liquid crystal polyester resin:

[0025] (1) The distribution ratio (weight %) of each component is: dibasic alcohol 30-40, aromatic dibasic acid and / or acid anhydride and / or methyl p-hydroxybenzoate 25-35, polymerization inhibitor 0.001-0.003, catalyst 1-3, Thinner 28.997-39.998.

[0026] Each component was weighed within the above composition range.

[0027] (2) Put the dibasic alcohol, aromatic dibasic acid and / or acid anhydride and / or methyl p-hydroxybenzoate and catalyst weighed in step (1) into the reactor, heat up to 200-220°C, and react until If the acid value is lower than 20mgKOH / g, add a polymerization inhibitor.

[0028] (3) Rapidly cool the product obtained in step (2) to <80°C in a dilution tank, remove excess unreacted compounds under reduced pre...

specific example 1

[0031] Concrete example 1: first weigh material (% by weight): ethylene glycol 5, diethylene glycol 27, isophthalic acid 6, methyl p-hydroxybenzoate 24, hydroquinone 0.0015, tetrabutyl titanate 2, Styrene 35.9985. Then, after mixing the weighed raw materials, they are evenly stirred by a stirrer to prepare a liquid crystal polyester resin with a melting point of 60-68°C.

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Abstract

The invention relates to a low-pressure SMC combined thickening agent and method for preparing same, wherein the thickening agent comprises (by weight proportion) liquid crystal polyester resin 50-70 with fusion point 60-77 deg. C, bibasic isocyanate compound 27-40, alkali metal oxide or alkali metal hydrate 3-10. The preparation process consists of weighing by proportion, and mixing.

Description

technical field [0001] The invention relates to the field of materials, in particular to a low-pressure sheet molding compound (SMC) combined thickener in combined thickeners and a preparation method thereof. Background technique [0002] With the continuous expansion of industrialization and automated production scale, the production of SMC profiles in the polyester molding compound market is becoming more and more popular, and its status is becoming more and more important. In the production process of traditional SMC, due to the high molding pressure, it needs to invest a lot of money to purchase expensive production molding equipment; and because of the high molding temperature, it also requires a lot of energy consumption. In the traditional SMC production process, the thickener generally uses alkaline earth metal oxides, mainly magnesium oxide. Although the price of alkaline earth metal oxide thickener is low, its thickening speed is slow, and its particle size, dispe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/00C08K5/29C08K5/39
Inventor 秦岩黄志雄李建梅启林付承菊彭永利李俊菊于浩
Owner 山东海博新材料有限公司