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A production method of bulk molding compound (bmc) that can improve product performance

A technology of bulk molding compound and production method, which is applied in the field of bulk molding compound production technology, can solve problems such as unresolved bulk molding compound, water content reduction, product appearance and performance impact, etc., to eliminate pore defects and improve performance , Improve the effect of mechanical and appearance properties

Active Publication Date: 2016-06-15
王莹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application uses a vacuum kneader to produce urea-formaldehyde molding compounds, the purpose of which is to reduce the water content in the raw materials, improve the production capacity of the first drying process, and eliminate the pollution of free formaldehyde in the kneading process to the atmosphere, and finally produce granular urea-formaldehyde molds Plastic, it does not solve the problem that there is a lot of air in the gap between the bulk molding compounds, which has a great impact on the appearance and performance of the product during the molding process

Method used

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  • A production method of bulk molding compound (bmc) that can improve product performance
  • A production method of bulk molding compound (bmc) that can improve product performance

Examples

Experimental program
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Effect test

Embodiment 1

[0029] combine figure 1 and figure 2 A method for producing bulk molding compound (BMC) that can improve product performance in this embodiment comprises the following steps:

[0030] (1) Mixing: Add resin, fillers, additives and glass fiber into a kneader according to a certain formula ratio for intensive mixing to obtain a loose bulk molding compound; specifically, take component A: 70 parts of resin, low shrinkage resin 30 parts, 1.5 parts of tert-butyl peroxybenzoate and 4 parts of zinc stearate, component B: 300 parts of ground calcium carbonate, component C: 75 parts of 6mm chopped glass fiber;

[0031] (1.1) Fully mix component A in a high-speed mixer for 5 minutes, pour the mixed component A into the kneader containing component B and mix vigorously for 10 minutes. This step is the initial mixing of resin, filler and additives;

[0032] (1.2) After the initial mixing, add component C to the kneader, vacuumize to -0.08MPa~-0.1MPa, and knead vigorously for 5min to for...

Embodiment 2

[0039]A production method of bulk molding compound (BMC) that can improve product performance in this embodiment is basically the same as in embodiment 1, the difference is that in the step (1.1) of this embodiment, the mixed component A is poured into the containing component Mix vigorously in the kneader of part B for 25min; add component C to the kneader in step (1.2), and vacuumize to -0.08MPa~-0.1MPa, and knead vigorously for 10min to form a loose dough molding compound; step ( 2) The obtained loose bulk molding compound is weighed according to a certain weight and packed in airtight PP plastic bags. The PP plastic bags are low in cost, high in strength and not easy to be damaged, which ensures that the vacuum treatment can be successfully completed.

Embodiment 3

[0041] A production method of bulk molding compound (BMC) that can improve product performance in this embodiment is basically the same as in embodiment 1, the difference is that in the step (1.1) of this embodiment, the mixed component A is poured into the containing component Mix vigorously in the kneader of part B for 45min; in step (1.2), add component C to the kneader, and vacuumize to -0.08MPa~-0.1MPa, and knead vigorously for 15min to form a loose dough molding compound; step ( In 2), the obtained loose bulk molding compound is weighed and packed in airtight containers according to a certain weight.

[0042] Such as figure 2 Shown, a kind of Bulk Molding Compound (BMC) production method that can improve product performance of the present invention, after Bulk Molding Compound (BMC) production is finished, put into airtight nylon bag or PP plastic bag or airtight container , first remove the air in it by vacuuming, and at the same time extrude the BMC mass, so that the...

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Abstract

The invention discloses a bulk molding compound (BMC) production method capable of improving the performances of a product, and belongs to the BMC preparation field. The method comprises the following steps: 1, mixing: adding resin, a filler, an assistant and glass fibers into a kneader according to a certain formula ratio, and strongly mixing to obtain loose BMC; 2, weighing packaging: packaging a certain weight of the loose BMC in an airtight film packaging bag or a closed container; 3, vacuumization: vacuumizing the packaged loose BWC obtained in step 2; and 4, compacting: compacting the vaccumized BMC obtained in step 3 to form compacted BMC, and sealing in a vacuum state. The method eliminates micropores in the product and a pore defect of the surface of the product, improves the performances of the product, improves the appearance of the product and reduces the workload of later repairing.

Description

technical field [0001] The invention relates to a production process of bulk molding compound, more specifically, relates to a production method of bulk molding compound (BMC) which can improve product performance. Background technique [0002] BMC is the abbreviation of Bulkmoldingcompounds, that is, bulk molding compound. It is often called unsaturated polyester bulk molding compound in China, which is mainly composed of GF (chopped glass fiber), UP (unsaturated resin), MD (filler calcium carbonate, aluminum hydroxide, kaolin, etc.) and various additives. Mix well. The preparation of traditional BMC is generally divided into two steps: (1) First, add resin, initiator, colorant, release agent, and some fillers into a high-shear mixer and stir evenly; (2) Mix the premixed slurry and Filling materials are added to Z-type, Σ-type and other reamer mixers or planetary mixers, and chopped glass fibers are added. After stirring for a period of time, pour out the lumps and extrud...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B7/00
Inventor 王莹
Owner 王莹
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