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

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Experimental program
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preparation example Construction

[0018] 2. Preparation of low-pressure SMC thickener

[0019] 1. Preparation of low pressure SMC thickener:

[0020] Firstly weigh the crystalline unsaturated polyester resin with a melting point of 50-103°C, divalent isocyanate compound, alkaline earth metal oxide or alkaline earth metal hydroxide according to the formula of low-pressure SMC thickener (see attached table 1), and then mix It can be made into a low-pressure SMC thickener, which is a joint thickening resin.

specific example

[0021] Specific example: Take 55 parts of crystalline unsaturated polyester resin, 40 parts of 4,4-diphenylmethane diisocyanate, and 5 parts of magnesium oxide, and mix them (see scheme 2 in the attached table 1).

[0022] 2. The preparation steps of crystalline unsaturated polyester resin:

[0023] (1) Determine and weigh each component within the stated composition range (see attached table 2);

[0024] (2) Put the weighed symmetrical diol, symmetrical saturated dibasic acid or acid anhydride into the reaction kettle, heat up to 170-180°C, and react until the acid value is lower than 10mgKOH / g;

[0025] (3) Add symmetrical unsaturated dibasic acid or acid anhydride to the resultant of step (2) for reaction, heat up to 200-220°C, vacuumize until the acid value is lower than 20mgKOH / g, and add a polymerization inhibitor;

[0026] (4) Dilute the product obtained in step (3) with a diluent at <80° C. in the dilution tank.

[0027] Above-mentioned symmetrical dihydric alcohol, ...

specific example 1

[0029] First weigh the material (% by weight): neopentyl glycol 27, ethylene glycol 7, isophthalic acid 6, maleic anhydride 27, hydroquinone 0.0015, styrene 32.9985. Then, after mixing the weighed raw materials, they are evenly stirred by a stirrer to prepare a crystalline unsaturated polyester resin with a melting point of 50-55°C.

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Abstract

The invention relates to a low-pressure SMC thickening agent and method for preparing same, wherein the thickening agent comprises (by weight proportion) crystallized unsaturated polyester resin 55-80 with fusion point 50-103 deg. C, bibasic isocyanate compound 15-40, alkali metal oxide or alkali metal hydrate 5-10, and the preparing 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) thickener in polyester molding compounds and a preparation method thereof. Background technique [0002] With the continuous expansion of industrialization and automated production scale, in the polyester molding compound market, the production of SMC profiles, that is, sheet molding compound profiles, 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/06C08K5/29
Inventor 黄志雄李建梅启林秦岩彭永利付承菊于浩李俊菊
Owner 山东海博新材料有限公司