High-fluidity flame-retardant sheet-shaped molding compound and preparation method thereof

A sheet-like molding compound and high-fluidity technology, which are used in the field of molding compound and its preparation, high-fluidity flame-retardant sheet-like molding compound and its preparation field, can solve the problems such as viscosity and fluidity of resin paste that are not involved, and make up for it. Loss of mechanical properties, improved flow, improved compaction and quality

Inactive Publication Date: 2016-11-30
ZHENSHI GRP HUAMEI NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-flame-retardant and low-smoke sheet molding compound provided by this patent emphasizes smoke-free and is used for traffic interior decoration. It does not use a high-impact low-shrinkage agent system and does not involve resin paste viscosity and fluidity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] This embodiment also provides a method for preparing a high-fluidity flame-retardant sheet molding compound, comprising the following steps:

[0033] a. Weigh unsaturated polyester resin, low shrinkage agent, flame retardant filler, initiator, polymerization inhibitor, internal mold release agent, viscosity reducing agent and styrene in a certain proportion, and fully mix to obtain resin paste;

[0034] b. Mixing the thickener with styrene to obtain a thickener paste;

[0035] c. The resin paste and the thickener paste are mixed through the online mixing system of the SMC unit, and then impregnated and compacted with the chopped glass fiber to obtain the SMC sheet;

[0036] d. Place the SMC sheet at a certain temperature to mature, and after the indentation hardness reaches a certain range, it is molded under heating and pressure conditions to obtain a high-fluidity flame-retardant sheet molding compound.

Embodiment 1

[0038] Prepare vinyl resin 36.8kg, high-impact polystyrene 9.2kg, chopped E-glass yarn size 25.4mm, 26kg, TBPB 0.56kg, 6.5% PBQ solution 0.4kg, styrene 2.3kg, stearin Zinc acid 2kg, 8μ aluminum hydroxide 42kg, 10μ aluminum hydroxide 25kg, 40% magnesium oxide paste 2.1kg, BYK996 0.3kg.

[0039] The above materials except the thickener paste are weighed in a certain proportion, and fully mixed to obtain a resin paste. Chopped glass fibers are impregnated and compacted to obtain SMC sheets; the SMC sheets are placed and matured at 40°C, and after the indentation hardness reaches 304, they are molded at 140-150°C to obtain high fluidity flame retardant Sheet molding compound, the sheet molding compound has passed the flame retardant test and is VO level flame retardant.

Embodiment 2

[0041] Prepare 20kg of isophthalic resin, 30kg of vinyl resin, 9.2kg of high-impact polystyrene, chopped E-glass fiber yarns of 25.4mm and 36kg in size, 0.66kg of TBPB, 0.5kg of 6.5% PBQ solution, and 2.6kg of styrene , zinc stearate 2kg, 6μ aluminum hydroxide 20kg, 8μ aluminum hydroxide 58kg, 40% magnesium hydroxide paste 2.5kg, BYK996 0.5kg.

[0042]The above materials except the thickener paste are weighed in a certain proportion, and fully mixed to obtain a resin paste. Chopped glass fibers are impregnated and compacted to obtain SMC sheets. Place the SMC sheet at 40°C for curing, and after the hardness reaches 304, mold it at 140-150°C to obtain a high-fluidity flame-retardant sheet molding compound, which has passed the flame-retardant test and is vo Grade flame retardant.

[0043] The high-impact polystyrene in this example is an impact-resistant polystyrene product produced by adding polybutyl rubber particles to polystyrene, and this polystyrene product will add mic...

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Abstract

The invention relates to a high-fluidity flame-retardant sheet-shaped molding compound and a preparation method thereof and belongs to the field of chemical engineering raw materials. A formula of the molding compound comprises, by mass parts, 15-30 parts of unsaturated polyester, 10-40 parts of glass fiber, 5-15 parts of low shrinkage agent, 30-60 parts of flame-retardant fillers, 0.2-1 part of initiator, 0.02-0.1 part of inhibitor, 0.2-1 part of thickener, 2-10 parts of styrene, 1-5 parts of internal releasing agent and 0.1-0.5 part of viscosity reduction addition agent. According to the high-fluidity flame-retardant sheet-shaped molding compound and the preparation method thereof, the high impact strength low shrinkage agent is adopted to make up for a loss of mechanical properties caused by adding of the flame-retardant fillers, the flame-retardant fillers of different diameters are utilized to play a synthetic synergic filling effect, so as to improve a flame retardant effect; and the resin paste viscosity is reduced through the viscosity reduction addition agent, so that the high-fluidity flame-retardant sheet-shaped molding compound is formed. The method for preparing the high-fluidity flame-retardant sheet-shaped molding compound is provided.

Description

technical field [0001] The invention relates to a molding compound and a preparation method thereof, in particular to a high-fluidity flame-retardant sheet molding compound and a preparation method thereof, belonging to the field of chemical raw materials. Background technique [0002] Sheet molding compound is made of unsaturated polyester resin plus auxiliary materials such as a certain amount of thickener, filler, curing agent and accelerator, etc., and is pressed into a plate by an SMC press. It has been widely used in construction, Rail transit and bathroom market. [0003] With the increasingly stringent environmental protection regulations and safety regulations, developed countries in the world have issued a series of new flame retardant technical standards and regulations, such as the latest EU standard EN45545, American ASTM E84-06, the flame retardant of polymer materials and products Combustibility presents unprecedented requirements. Looking at these standards...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/06C08L51/04C08K13/04C08K7/14C08K5/098C08K3/22
CPCC08L67/06C08K2201/003C08K2201/004C08K2201/014C08L2201/02C08L2205/025C08L2205/03C08L51/04C08K13/04C08K7/14C08K5/098C08K2003/2227C08K2003/222
Inventor 朱一刘金花张健侃沈达盛江峰杨国刚
Owner ZHENSHI GRP HUAMEI NEW MATERIALS
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