Ultra-light high-strength high-sound-absorption fiber-reinforced thermoplastic foamed composite board and preparation method thereof

A fiber-reinforced, composite plate technology, applied in the direction of chemical instruments and methods, melt spinning, synthetic resin layered products, etc., can solve the problems of difficult operation, environmental hazards, high operating requirements, etc., to reduce manufacturing costs and reduce production costs , Improve the effect of mechanical properties

Inactive Publication Date: 2020-04-21
浙江华江科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (2) The hot-melt resin and glass fiber are mainly combined by point connection. In order to ensure the mechanical properties, the amount of resin used is relatively large, which not only has a relatively high cost, but also limits the further development of ultra-lightweight;
[0005] (3) The amount of infiltrated air is insufficient, the degree of freedom in product design is low, and the NVH performance originally lags behind imported products
However, because the unraised foaming agent powder is very small (particle size less than 40 μm) and is explosive, in the actual production process, the powdering process mentioned in the patent CN201711451801.X involves serious dust, and the patent CN201711451806.2 mentioned The adhesion method involves uneven adhesion of the microsphere foaming agent, the volatilization of the oil agent causes the foaming agent to fall off, the foaming agent falls off seriously during the carding process, the operation is very difficult, the stability of the product is extremely poor, and the level and requirements of mass production cannot be met. , the impregnation process mentioned in patent CN201610763845.5 consumes a lot of energy, and a large amount of waste liquid is generated in the process, which is harmful to the environment, and the foaming agent is deposited on the bottom of the felt net to cause uneven distribution, which seriously affects the mechanical properties of the product
[0009] Patent CN200680020471.2 develops a new process, disperses reinforcing fiber, thermoplastic resin powder, microsphere foaming agent and surfactant in aqueous solution, and uses papermaking process to make mesh, but this method requires large equipment investment and complicated process , the operation requirements are high, and the production process needs to be equipped with high-priced foaming liquid, and the cost of producing products is relatively high

Method used

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  • Ultra-light high-strength high-sound-absorption fiber-reinforced thermoplastic foamed composite board and preparation method thereof
  • Ultra-light high-strength high-sound-absorption fiber-reinforced thermoplastic foamed composite board and preparation method thereof
  • Ultra-light high-strength high-sound-absorption fiber-reinforced thermoplastic foamed composite board and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A kind of expandable thermoplastic fiber for preparing fiber-reinforced thermoplastic foam composite sheet, composed of polypropylene fiber 1 expandable microsphere foaming agent 3, such as figure 1 shown. The specific preparation method is as follows:

[0040] On a conventional melt spinning machine, the modified polypropylene powder with different particle sizes and the microsphere foaming agent 3 are blended and sent into the screw extruder, and the temperature range of each zone on the screw extruder is 170-205 °C The resulting melt is then extruded from the spinneret through a metering pump, and the melt is wound at a speed of 500-800m / min to obtain a coiled wire, which is then pre-drawn and heated at 100-140°C Hot drawing, the draw ratio is 5-9. The fibers are then heat-set at 100-120°C and retracted under stress at 90-110°C, and then wound into finished filaments (foamed fibers for short). The foamed fibers prepared by polypropylene powder with different parti...

Embodiment 2

[0046] An ultra-light and high-strength GMT composite sheet for preparing automobile bottom guards, which consists of polypropylene fiber 1 as a bonding matrix, glass fiber 2 as a reinforcement, and the expansion ratio of the sheet can be adjusted by changing the lattice point connection mode between the glass fibers 2 Efficacy of microsphere blowing agent 3 composition, such as figure 1 shown.

[0047] Its specific preparation method comprises the following steps:

Embodiment 3

[0084] An ultra-light and high-strength GMT composite sheet for preparing the roof of an automobile, which is made of ES fiber as a bonding matrix, hemp fiber as a reinforcement, and microspheres that have the effect of changing the grid connection mode between reinforcing fibers and adjusting the expansion ratio of the sheet. Agent 3 composition.

[0085] Its specific preparation method comprises the following steps:

[0086] (1) Blend and melt-spin microsphere foaming agent 3 and polypropylene fiber 1 at an initial foaming temperature of 210°C to form thermoplastic foamed polypropylene fiber 1 uniformly containing microsphere foaming agent 3, microsphere foaming agent 3 content is 9.5wt% of the mass of polypropylene fiber 1;

[0087] (2) Mix polypropylene fiber 1 and glass fiber 2 containing microsphere foaming agent 3 uniformly in the ratio of 45wt%: 55wt%, and through the non-woven process through opening, mixing, carding, laying, and acupuncture, it is obtained A blende...

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Abstract

The invention discloses an ultra-light high-strength high-sound-absorption fiber-reinforced thermoplastic foamed composite board and a preparation method thereof, wherein the ultra-light high-strengthhigh-sound-absorption fiber-reinforced thermoplastic foamed composite board is prepared by using a binder uniformly containing a forming agent and a fiber reinforcement body through a non-woven and continuous board-making composite process. According to the invention, plastic synthetic fibers uniformly containing a microsphere foaming agent are prepared by blending the microsphere foaming agent and thermoplastic resin powder as raw materials through a melt spinning procedure; the advantages of a non-woven process can be fully utilized to stably, continuously and efficiently produce the ultra-light high-strength GMT composite board; and the microsphere foaming agent does not fall off in a felt making link, so that the high-quality composite felt containing the microsphere foaming agent canbe prepared safely in batches without increasing additional investment such as newly increased equipment, personnel training and the like, and the manufacturing cost of the section is remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of thermoplastic composite materials, and in particular relates to an ultra-light, high-strength, high-sound-absorbing fiber-reinforced thermoplastic foam composite board and a preparation method thereof. Background technique [0002] Against the backdrop of global energy conservation and emission reduction, countries around the world have put forward higher standards and stricter market access permits for the automobile manufacturing industry, especially with the rapid development of new energy vehicles. Automobile lightweight is an inevitable trend of automobile development, and composite As one of the most important lightweight materials, materials have attracted much attention in the automotive industry due to their excellent performance. Lightweight glass fiber mat reinforced thermoplastic composites, referred to as lightweight GMT (Glass Fiber Mat Reinforced Thermoplastics), because of its light weight...

Claims

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Application Information

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IPC IPC(8): B32B27/02B32B27/18B32B27/06B32B27/32B32B37/06B32B37/10D01D5/08D04H1/46D04H1/4382B60R13/08
CPCB32B5/02B32B37/06B32B37/10B32B2262/0253B60R13/08D01D5/08D04H1/4382D04H1/46
Inventor 花东龙马国维陈磊方晶梅金波周立
Owner 浙江华江科技股份有限公司
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