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Toughening calcium carbonate composite powder for sheet molding compound

A technology of sheet molding compound and calcium carbonate, which is applied in fibrous fillers, dyed low-molecular organic compound treatment, dyed high-molecular organic compound treatment, etc., can solve the problem of poor product pertinence, low added value of products, and improved product performance Limited problems, to achieve the effects of reduced shrinkage, improved curing performance, and improved toughness

Inactive Publication Date: 2014-07-02
许峰
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Problems solved by technology

Due to the large reserves, good quality, broad market and good development space of calcium carbonate in China, the output and demand of calcium carbonate in China have increased rapidly in the past two decades, but most of them are used as ordinary fillers. Use, the product is not targeted, generally belongs to low-end products, and the performance improvement of the product is limited, so there are problems such as low added value of the product.

Method used

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Embodiment Construction

[0019] The present invention will be further described in detail according to the examples below.

[0020] The present invention, the preparation method of toughened calcium carbonate composite powder for sheet molding compound, its steps are as follows:

[0021] (1) Calcite raw ore is washed, air-dried, and primary pulverized;

[0022] (2) Grind and classify the material with vibrating high fine mill, and reclassify the powder with different particle size distribution by adjusting the cyclone classification parameters to an average particle size of less than 5 microns, d97 is controlled at 16 microns, and d97=10 microns or less less than 10%;

[0023] (3) In terms of weight percentage, 35% to 70% of graded and impurity-removed powder, 5% to 25% of magnesium oxide powder, 1 to 10% of high molecular weight hydroxyphenylbenzotriazole ultraviolet absorber, 1 ~10% powdered nitrile rubber is mixed, stirred and ground;

[0024] (4) Put the ground mixture in the all-in-one mach...

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Abstract

The invention discloses a preparation method of a toughening calcium carbonate composite powder for a sheet molding compound. The preparation method comprises the following steps: washing, drying and crushing calcite raw ore; grading; grading and re-grading; mixing for preparation; coating; drying; and modifying. The invention has the beneficial effect that the composite powder can increase the toughness of the sheet molding compound by more than 30% and reduce the shrinkage rate by 40% compared with ordinary products, and at the same time improves curing performance, aging resistance and surface quality of the product.

Description

technical field [0001] The invention relates to a preparation method of a toughened calcium carbonate composite powder for sheet molding materials, and belongs to the technical field of chemical material production and manufacturing. Background technique [0002] Calcium carbonate is a non-metallic inorganic filler with the largest amount and widest application. Due to its wide range of raw materials, low price, non-toxicity and high whiteness, it is widely used in plastics, rubber, papermaking, coatings and other fields. Due to the large reserves, good quality, broad market and good development space of calcium carbonate in China, the output and demand of calcium carbonate in China have increased rapidly in the past two decades, but most of them are used as ordinary fillers. Use, the pertinence of the product is not strong, generally belongs to the low-grade product, the performance improvement of the product is limited, so there are problems such as low added value of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/10C09C3/04C09C3/08C08K9/04C08K9/10C08K3/26
Inventor 许峰
Owner 许峰
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