Sheet molding compound and preparation method thereof

A technology of sheet molding compound and release agent, which is applied in the field of sheet molding compound and its preparation, can solve the problems of not meeting the requirements of mechanical properties and insulation properties, the value of finished products is not proportional, and the cost of carbon fiber is high, so as to achieve good mechanical properties , Good molding effect, high compressive strength

Pending Publication Date: 2022-05-03
青岛东远新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing polyester composite materials premixed with SMC and BMC cannot meet the requirements of mechanical properties and insulation properties; while the composite materials made of epoxy system plus carbon fiber have good mechanical properties and insulation properties, However, the finished product has the problems of poor formability and poor surface plasticity, and the cost of carbon fiber is relatively high, which is easily not proportional to the value of the finished product

Method used

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  • Sheet molding compound and preparation method thereof
  • Sheet molding compound and preparation method thereof

Examples

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preparation example Construction

[0040] Preparation example of basalt fiber

[0041] The basalt fiber in the following raw materials was purchased from the chopped basalt fiber produced by Tai’an Haosong Fiber Co., Ltd., with a length of 3 mm; other raw materials and equipment are commercially available.

preparation example 1

[0042] Preparation example 1: Basalt fiber is prepared by the following method:

[0043] ⅠWeigh the basalt fiber and place it in 10% sodium hydroxide aqueous solution for soaking, grind it for 2.5min at a speed of 110r / min during soaking, then take out the basalt fiber and place it in 5% sodium lauroyl sarcosinate Soak and stir in the aqueous solution, stir for 2 minutes at a rotating speed of 80r / min, then take out the basalt fiber to obtain a semi-finished product;

[0044] Ⅱ Weigh rosin and place it in absolute ethanol, stir at 70°C until it is completely dissolved, and obtain a rosin ethanol solution with a mass fraction of 10%, weigh 2 kg of rosin ethanol solution and spray evenly on the surface of 10 kg of semi-finished products, and after drying, obtain Modified basalt fiber.

preparation example 2

[0045] Preparation example 2: Basalt fiber is prepared by the following method:

[0046] ⅠWeigh the basalt fiber and place it in 5% sodium hydroxide aqueous solution by mass fraction for soaking, grind it for 5 minutes at a rotating speed of 80r / min during the soaking process, then take out the basalt fiber and place it in 2% mass fraction of sodium lauroyl sarcosinate aqueous solution Soak and stir in medium, stir 3min under the rotating speed of 80r / min, then take out basalt fiber, make semi-finished product;

[0047] Ⅱ Weigh rosin and place it in absolute ethanol, stir at 70°C until completely dissolved to obtain a rosin ethanol solution with a mass fraction of 5%, weigh 1 kg of rosin ethanol solution and spray evenly on the surface of 10 kg of semi-finished products, and after drying, obtain Modified basalt fiber.

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Abstract

The invention relates to the field of high polymer materials, and particularly discloses a sheet molding compound and a preparation method thereof. The sheet molding compound is prepared from the following raw materials in parts by weight: 80 to 100 parts of polyurethane resin, 85 to 100 parts of basalt fiber, 25 to 40 parts of hollow glass beads, 30 to 45 parts of expanded microspheres, 4 to 6.5 parts of a thickening agent, 2.5 to 8 parts of a release agent, 10 to 16 parts of a low-shrinkage additive and 0.5 to 2.2 parts of a curing agent, the preparation method comprises the following steps: S1, weighing the polyurethane resin, the hollow glass beads and the expanded microspheres, mixing and stirring to prepare a primary mixture; s2, weighing a thickening agent, a release agent, a low-shrinkage additive and a curing agent, adding into the primary mixture, and uniformly mixing and stirring to obtain a mixture; and S3, mixing the mixture with basalt fibers, and carrying out compression molding and standing shaping to obtain a finished product. Therefore, the sheet molding compound has the advantages of good mechanical property, good insulating property and good plasticity at the same time.

Description

technical field [0001] This application relates to the field of polymer materials, more specifically, it relates to a sheet molding compound and its preparation method. Background technique [0002] Sheet molding compound (SMC) is abbreviated as SMC. It is made of SMC special yarn, unsaturated resin, low shrinkage additives, fillers and various additives by heating and pressing. It is widely used in construction, anti-corrosion and aerospace fields, meeting the requirements of high strength, light weight, high performance, insulation, and low dielectric loss in aerospace and military applications. [0003] The existing polyester composite materials premixed with SMC and BMC cannot meet the requirements of mechanical properties and insulation properties; while the composite materials made of epoxy system plus carbon fiber have good mechanical properties and insulation properties, However, the finished product has the problems of poor formability and poor surface plasticity, ...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08L83/04C08L91/06C08K9/02C08K9/04C08K7/10C08K7/28
CPCC08L75/04C08L83/04C08L91/06C08K9/02C08K9/04C08K7/10C08K7/28Y02W30/91
Inventor 万年宝孙林坤杨远军万年先王修玉
Owner 青岛东远新材料科技有限公司
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