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Polyurethane composite board with high light weight, high strength and high sound absorption, and full adhesive film forming technology of polyurethane composite board

A molding process and high-strength technology, applied in synthetic resin layered products, chemical instruments and methods, lamination devices, etc., can solve problems such as unsatisfactory sound absorption, unsatisfactory sound absorption of PU composite boards, and excellent sound absorption performance. Improve rigidity and peel strength, realize light weight, and achieve excellent bonding effect

Active Publication Date: 2015-04-08
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

At this stage, the sound absorption of the PU composite board prepared by the above two methods is not ideal. Even if the glass fiber is replaced with porous natural fiber, it is limited by the barrier effect of the reinforced or adhesive film, so that it has a porous structure. The PU cannot give full play to the advantages of its excellent sound-absorbing performance, resulting in the sound-absorbing performance of the final PU composite board is still not ideal

Method used

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  • Polyurethane composite board with high light weight, high strength and high sound absorption, and full adhesive film forming technology of polyurethane composite board
  • Polyurethane composite board with high light weight, high strength and high sound absorption, and full adhesive film forming technology of polyurethane composite board
  • Polyurethane composite board with high light weight, high strength and high sound absorption, and full adhesive film forming technology of polyurethane composite board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) First add 15 g / m 2 The ethylene-acrylic acid copolymer reticular hot melt adhesive film 1 is unrolled and laid flat on the crawler of the compound machine (the reticular film is a spider web film, the hole shape is rhombus, the length of the hole is 15mm, and the opening ratio is 2 %), then spread glass fibers with length-to-diameter ratios of 1000, 500, and 200 on the film, and the mass ratios of the three glass fibers are 7:2:1, and then unwind and spread 30 g / m 2 The ethylene-acrylic acid copolymer reticulated hot-melt adhesive film 1, the grammage of the reticulated hot-melt adhesive film 1 on both sides of the glass fiber is not consistent, hot-compression compounding is carried out at 230°C and 0.3 MPa, cooled, and rolled up. A film-type fiber mat 3 was obtained, wherein the glass fiber content was 20 wt%. The speed of the laminating machine at this stage is 15 m / min.

[0040] (2) On the crawler of the compound machine, unwind, lay flat, and stack 40 g / m in ...

Embodiment 2

[0044] (1) First add 20g / m 2 The modified polyethylene mesh hot-melt adhesive film 1 is unrolled and laid flat on the crawler of the compound machine (the mesh is a knife-cut film, the shape of the hole is circular, the length of the hole is 5mm, and the opening rate is 20% ), then spread basalt fibers with length-to-diameter ratios of 200, 2000 and 400 on the film, and the mass ratio of the three basalt fibers is 7:2:1, and then unwind and spread 35g / m 2 Modified polyethylene reticular hot-melt adhesive film 1, the grammage of the reticular hot-melt adhesive film 1 on both sides of the basalt fiber is inconsistent, hot-compression compounding is carried out at 200 ° C, 0.6MPa, cooling, winding, and obtain Film-type fiber felt 3, in which the content of basalt fiber is 50 wt%. The speed of the laminating machine at this stage is 12 m / min.

[0045] (2) On the crawler of the compound machine, unwind, lay flat, and stack 55 g / m in sequence from bottom to top 2 Needle-punched f...

Embodiment 3

[0048] (1) First add 25 g / m 2 The modified ethylene-vinyl acetate copolymer mesh hot melt adhesive film 1 is unrolled and laid flat on the crawler of the compound machine (the mesh is a spider web film, the shape of the hole is rhombus, the length of the hole is 25mm, and the opening rate of 40%), and then spread bamboo fibers with length-to-diameter ratios of 3000, 1000 and 200 on the film. / m 2 Modified ethylene-vinyl acetate copolymer reticular adhesive film, the weight of the reticular hot-melt adhesive film 1 on both sides of the bamboo fiber is inconsistent, at 160 ° C, 1MPa, carry out hot-compression compounding, cooling, winding, and obtain Film-type fiber mat 3, wherein the glass fiber content is 80 wt%. The production speed at this stage is 16 m / min

[0049] (2) On the crawler of the compound machine, unwind, lay flat, and stack 80 g / m in sequence from bottom to top 2 The hot-rolled non-woven fabric and the film-type fiber mat 3 are placed, and then the PU foam b...

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Abstract

The invention relates to a forming technology of a PU (polyurethane) composite board and particularly relates to a full adhesive film forming technology of a PU composite board with high light weight, high strength and high sound absorption for a high-grade car roof. The polyurethane composite board with high light weight, high strength and high sound absorption is compounded of a bottom fabric, adhesive film type fiber felt, a PU foaming board, adhesive film type fiber felt and net-shaped hot melt adhesive films which are sequentially laminated from bottom to top; according to the adhesive film type fiber felt, a central core layer is made of reinforce fibers and the upper surface and the lower surface of the central core layer are respectively composited with net-shaped hot melt adhesive films with different gram weights. The dust pollution problem caused by the use of adhesive powder is avoided; besides, fibers and the adhesive film are compounded firstly; and the invasion of the adhesive film to glass fibers is improved, so that the rigidity and the peeling strength of the polyurethane composite board are improved.

Description

technical field [0001] The invention relates to a forming process of a PU composite board, in particular to a light-weight, high-strength, high-sound-absorbing, all-adhesive film forming process for a PU composite board for a high-grade automobile roof. Background technique [0002] PU composite board has the characteristics of light weight, heat insulation and good toughness. It has been widely used in automobile roofs in recent years and has completely replaced traditional cardboard or EPS foam board. The preparation process of PU composite board in the relevant patents published at present mainly has the following two categories: [0003] (1) Two-step method: related patents include Chinese patents CN202130090 and CN101367287, among which, the process involved in Chinese patent CN101367287 is taken as an example, that is, the chopped glass fiber and hot-melt rubber powder are first hot-pressed to obtain glass fiber-reinforced glue Glass film, then unwinding, stacking, fl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B17/02B32B17/10B32B27/12B32B37/06B32B37/10
Inventor 傅华康许燕方腾飞楼娣马国维
Owner 浙江华江科技股份有限公司
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