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Fiber-reinforced modified-reaction injection-molding nylon sheet and preparation method thereof

A fiber-reinforced, injection-molded technology applied in the field of materials science to achieve the effect of ensuring continuity

Active Publication Date: 2009-09-09
株洲时代工程塑料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a kind of fiber injection molded nylon plate and its preparation method that can further increase the intensity of reaction injection nylon for the deficiency of existing RIM nylon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Divide 60 parts of caprolactam into two parts according to 1:1 and add to reactors A and B, vacuumize to 0.1MPa, heat and melt, dehydrate at 120-150°C for 15min, stop vacuuming, and pass nitrogen.

[0020] 2) Open the reactor, add 0.1 part of sodium hydroxide to reactor A, add 0.2 part of 4,4' diphenylmethane-diisocyanate (MDI), 0.2 part of antioxidant, 1.0 part of stabilizer to reactor B, Then the reactors A and B were vacuumed to about 0.1MPa, the reaction temperature was maintained at 140-145°C for 20 minutes, the vacuum was stopped, and nitrogen gas was introduced.

[0021] 3) Cut the glass fiber cloth treated with silane coupling agent into a size that matches the mold cavity of the press, lay it in layers in the mold cavity, and then close the mold and heat it to a temperature of 180°C. The mass fraction of the glass fiber cloth is 40 servings.

[0022] 4) The active materials in the reaction kettles A and B are mixed through the metering device, and immediate...

Embodiment 2

[0024] 1) Divide 80 parts of caprolactam into two parts according to 1:1 and add to reactors A and B, vacuumize to 0.1MPa, heat and melt, dehydrate at 120-150°C for 15min, stop vacuuming, and pass nitrogen.

[0025] 2) Open the reactor, add 0.2 parts of sodium hydroxide to reactor A, add 4 parts of cocatalyst, 0.1 part of antioxidant, and 0.5 parts of stabilizer to reactor B, and then vacuumize reactors A and B to about 0.1MPa , the reaction temperature was maintained at 140-145°C for 10 minutes, the vacuum was stopped, and nitrogen gas was introduced.

[0026] 3) Put 20 parts of chopped glass fibers treated with silane coupling agent into the mold cavity of the press, close the molds, and raise the temperature to 170°C.

[0027] 4) The active materials in the reaction kettles A and B are mixed through the metering device, and immediately injected into the mold cavity at 170°C where the chopped glass fiber is preset, and the mold is closed. After 15 minutes of reaction, pressu...

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Abstract

The invention relates to a fiber-reinforced modified-reaction injection-molding nylon sheet and a preparation method thereof, belonging to the field of composite material preparation. An amide monomer is used as a basal raw material; a catalyst, an auxiliary catalyst, an auxiliary antioxidant, a stabilizing agent, a surface conditioning agent, and the like are added; and the materials are injected into a high-temperature mold cavity with preset fibers by an RIM and thermally pressed and molded to prepare the reinforced modified-reaction injection-molding nylon sheet. The prepared sheet comprises the following ingredients by mass percentage: 30 to 95 of amide monomer, 3 to 70 of fiber, 0.01 to 2 of catalyst, 0.01 to 10 of auxiliary catalyst, 0.1 to 2 of antioxidant, 0.1 to 2 of stabilizing agent and 0.1 to 1 of surface conditioning agent, wherein the amide monomer is caprolactam or dodecalactam, the fiber is one of glass fiber, carbon fiber or aramid fiber and is in the form of fiber cloth, short-cut fiber or compound fiber. Compared with common reaction injection nylon and monomer cast nylon sheets, the reaction injection-molding nylon sheet has stronger carrying capability, low manufacture cost and easy popularization and application.

Description

technical field [0001] The invention relates to a nylon sheet material and a preparation method thereof, in particular to a fiber-reinforced modified reaction injection molded nylon sheet and a preparation method thereof, belonging to the field of material science. Background technique [0002] Compared with ordinary injection nylon products, RIM nylon has higher rigidity, heat distortion temperature, and lower hygroscopicity, and is easy to form large-scale products. Reinforcement of RIM nylon with fibers can produce a stronger material that can replace metal materials in some applications, such as sewer manhole covers on urban roads. [0003] At present, domestic research on RIM nylon is still at the level of manual casting (MC). The preparation process of fiber-reinforced MC nylon is as follows: the fiber is spread into the mold and fully preheated; the caprolactam monomer is heated and melted, and vacuum dehydrated; Continue vacuum dehydration at a certain temperature, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/14C08G69/22C08K9/06C08K7/14C08K7/06B29C43/58B29C45/76B29D7/00C08L77/00
Inventor 杨海洋刘爱学邓凯桓黄安民黄磊刘宵郑梯和
Owner 株洲时代工程塑料科技有限责任公司
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