High-strength low-gram-weight polyurethane composite board

Abstract

The utility model relates to a high-strength low-gram-weight polyurethane composite board, which mainly solves the technical problems that the polyurethane composite board in the prior art is low in bending strength and easy to tear. According to the utility model, the problem is well solved by adopting the technical scheme that a first layer of non-woven fabric (1), a first layer of polymeric membrane (2), a second layer of polymeric membrane (3), a first layer of glass fiber thermoplastic plastic (4), polyurethane foam (5), a second layer of glass fiber thermoplastic plastic (6), a third layer of polymeric membrane (7) and a fourth layer of polymeric membrane (8) are sequentially arranged from top to bottom. The method can be used for production and application of polyurethane composite boards.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of polyurethane, especially to a high-strength low-gram-weight polyurethane composite board. BACKGROUND

[0002] With the development of the automobile industry, the requirements for the light weight and strength of the automobile interior are becoming higher and higher. In the prior art, polyurethane composite boards are applied to automobile roofs. When the automobile roof is applied to the corresponding part, the rigidity of the automobile roof is insufficient and bending is prone to occur. Generally, the rigidity index of the polyurethane board used for the automobile roof is represented by the bending strength and the deformation amount.

[0003] Chinese patent CN201721148529.3 discloses a locally high-strength polyurethane composite board, which comprises eight layers of materials, from top to bottom, in order: a first layer of high-molecular film, a first layer of glass fiber layer, a first layer of glue powder layer, a polyurethane board, a locally high-strength glass fiber layer, a second layer of glue powder layer, a second layer of glass fiber layer, and a non-woven fabric layer. The locally high-strength glass fiber layer is composed of a high-molecular film and a glass fiber layer, and has a thickness of 200-800 microns. The glass fiber layer is selected from glass fiber cloth, glass fiber felt, or glass fiber. By adopting the locally high-strength glass fiber layer, the strength of the composite board reaches the required range, the gram weight is reduced, local tearing is overcome, and the defect of wrinkling is reduced. However, the strength still needs to be further improved to meet the increasingly high rigidity requirements.

[0004] Chinese patent CN212708335U discloses a high-bending-strength polyurethane composite board, which comprises, from top to bottom, in order: a first layer of non-woven fabric, a first layer of high-molecular film, a first layer of glass fiber, a first layer of polyethylene powder, a glass fiber felt, a second layer of high-molecular film, polyurethane foam, a third layer of high-molecular film, a second layer of glass fiber, a second layer of polyethylene powder, and a polyethylene film. The glass fiber felt is composed of glass fiber and polyethylene powder. By distributing and pasting the composite glass fiber felt, the bending strength of the polyurethane composite board is strengthened, so that the polyurethane composite board has a certain bending strength and is not prone to tearing. However, in order to meet the increasingly high rigidity requirements, the bending strength still needs to be further improved, and the deformation amount index is not involved. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is the low bending strength and easy deformation of the polyurethane composite board in the prior art. The utility model provides a new high-strength low-gram-weight polyurethane composite board, which has the advantages of low gram weight, high bending strength, and not easy to deform.

[0006] To solve the above technical problems, the utility model adopts the technical scheme as follows: a kind of high-strength low gram weight polyurethane composite board, by adopting from top to bottom sequentially including first layer non-woven fabric 1, first layer high molecular film 2, second layer high molecular film 3, first layer glass fiber thermoplastic 4, polyurethane foam 5, second layer glass fiber thermoplastic 6, third layer high molecular film 7, fourth layer high molecular film 8.

[0007] In the above technical solution, preferably, the first layer non-woven fabric 1 is selected from hot-rolled non-woven fabric, spunlace non-woven fabric, melt-blown non-woven fabric or spun-bonded non-woven fabric, and the thickness is 0.5-1mm.

[0008] In the above technical solution, preferably, the first layer high molecular film 2 is selected from polypropylene high molecular film or polyamide high molecular film, and the thickness is 50-60μm, and the gram weight is 50-70g / m 2

[0009] In the above technical solution, preferably, the first layer glass fiber thermoplastic 4 and the second layer glass fiber thermoplastic 6 have a thickness of 3-6mm and a gram weight of 200-300g / m 2 .

[0010] In the above technical solution, preferably, the second layer high molecular film 3, the third layer high molecular film 7 and the fourth layer high molecular film 8 are selected from high-density polyethylene film, and the thickness is 30-50μm, and the gram weight is 30-50g / m 2 .

[0011] In the above technical solution, preferably, the polyurethane foam 5 has a thickness of 5-15mm and a density of 35±5kg / m 3 .

[0012] In the utility model, GMT is first added to replace the original glass fiber, which is a glass fiber reinforced polypropylene material with a glass fiber content of 22%-50%, and the other main material is polypropylene (PP). After heating and forming, it has high bending strength. The first layer high molecular film and non-woven fabric effectively bond, the second layer and third layer high molecular film effectively penetrate the GMT, increase the rigidity of the polyurethane composite board, and facilitate adhesion to the polyurethane board after penetration. This scheme solves the above problems, and the bending strength of this kind of polyurethane composite board is 800g / m 2 Under the same gram weight, the bending strength is increased to more than 2.4kPa, so that the polyurethane composite board is not easy to deform when applied to the automobile roof part, and good technical effects are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0013] ATTACH Figure 1 It is the structure diagram of high-strength low-gram-weight polyurethane composite board.

[0014] attached Figure 1 In the figure, 1 is a first layer of non-woven fabric, 2 is a first layer of polymer film, 3 is a second layer of polymer film, 4 is a first layer of glass thermoplastic, 5 is a polyurethane foam, 6 is a second layer of glass thermoplastic, 7 is a third layer of polymer film, and 8 is a fourth layer of polymer film.

[0015] The utility model will be further described below through examples, but not limited to the examples. DETAILED DESCRIPTION

[0016] Example 1

[0017] A high-strength low-gram-weight polyurethane composite board, from top to bottom, sequentially includes a first layer of non-woven fabric 1 which is a spunlace non-woven fabric with a thickness of 1 mm, a first layer of polymer film 2 which is a polypropylene polymer film with a thickness of 50 μm and a gram weight of 50 g / m 2 , a second layer of polymer 3 which is a high-density polyethylene film with a thickness of 40 μm and a gram weight of 40 g / m 2 , a first layer of glass thermoplastic 4 with a thickness of 4 mm and a gram weight of 230 g / m 2 . A polyurethane foam 5 with a thickness of 5 mm and a density of 35 kg / m 3 , a second layer of glass thermoplastic 6 with a thickness of 4 mm and a gram weight of 230 g / m 2 , a third layer of polymer film 7 which is a high-density polyethylene film with a thickness of 40 μm and a gram weight of 40 g / m 2 , and a fourth layer of polymer film 8 which is a high-density polyethylene film with a thickness of 40 μm and a gram weight of 40 g / m 2 The product test data of the high-strength low-gram-weight polyurethane composite board prepared are shown in Table 2.

[0018] Examples 2 to 5

[0019] Examples 2 to 5 form polyurethane composite boards according to the layer structure of Example 1, the only difference being that the types of materials of the layers of the polyurethane composite boards are different, and the performance indicators of the materials are different, as shown in Table 1; the product test data of the high-strength low-gram-weight polyurethane composite board prepared are shown in Table 2.

[0020] Table 1 Performance indicators of the layer materials of the polyurethane composite boards in Examples 1 to 5

[0021]

[0022] Comparative Example 1

[0023] A polyurethane composite board, from top to bottom, sequentially includes a first layer of spunlace non-woven fabric with a thickness of 1 mm, a first layer of polymer film 2 which is a polypropylene polymer film with a thickness of 50 μm and a gram weight of 50 g / m2 The first layer of glass fiber 3 has a monofilament diameter of 3 μm, a fiber length of 25 mm, and a thickness of 400 μm. The first layer of polyethylene powder 4 is linear low-density polyethylene powder with a thickness of 150 μm. The glass fiber felt 5 is composed of glass fiber 12 and polyethylene powder 13, wherein the glass fiber 12 has a monofilament diameter of 3 μm, a fiber length of 25 mm, and a thickness of 100 μm, and the polyethylene 13 is linear low-density polyethylene powder with a thickness of 80 μm. The second layer of high polymer film 6 is high-density polyethylene film with a thickness of 30 μm and a grammage of 30 g / m 2 The polyurethane foam 7 has a thickness of 5 mm. The third layer of high polymer film 8 is high-density polyethylene film with a thickness of 30 μm and a grammage of 30 g / m 2 The second layer of glass fiber 9 has a monofilament diameter of 3 μm, a fiber length of 25 mm, and a thickness of 800 μm. The second layer of polyethylene powder 10 is linear low-density polyethylene powder with a thickness of 150 μm. The polyethylene film 11 has a grammage of 30 g / m 2 The polyurethane foam 7 has a thickness of 5 mm. The third layer of high polymer film 8 is high-density polyethylene film with a thickness of 30 μm and a grammage of 30 g / m

[0024] The product testing data of the high-strength low-grammage polyurethane composite board prepared are shown in Table 2.

[0025] Table 2: Quality testing data of the polyurethane composite board of Examples 1 to 5 and Comparative Example 1

[0026]

[0027] As shown in Table 3, compared with Comparative Example 1, the high-strength low-grammage polyurethane composite board of the present application has a bending strength as high as 2.4 kPa and a bending force as high as 22.87 N under the condition of the same grammage of the polyurethane composite board, which helps to improve the rigidity of the polyurethane composite board. At the same time, due to the increase in the bending strength and rigidity of the polyurethane composite board, the deformation amount is reduced, and good technical effects are achieved.

Claims

1. A high-strength, low-weight polyurethane composite board, characterized in that... From top to bottom, the layers are: first nonwoven fabric (1), first polymer film (2), second polymer film (3), first glass fiber thermoplastic (4), polyurethane foam (5), second glass fiber thermoplastic (6), third polymer film (7), and fourth polymer film (8).

2. The high-strength, low-weight polyurethane composite board according to claim 1, characterized in that, The first layer of nonwoven fabric (1) is selected from thermally rolled nonwoven fabric, spunlace nonwoven fabric, meltblown nonwoven fabric or spunbond nonwoven fabric, and has a thickness of 0.5 to 1 mm.

3. The high-strength, low-weight polyurethane composite board according to claim 1, characterized in that, The first polymer membrane (2) is selected from polypropylene polymer membrane or polyamide polymer membrane, with a thickness of 50-60 μm and a basis weight of 50-70 g / m³. 2 .

4. The high-strength, low-weight polyurethane composite board according to claim 1, characterized in that, The first layer of glass fiber thermoplastic (4) and the second layer of glass fiber thermoplastic (6) have a thickness of 3-6 mm and a basis weight of 200-300 g / m³. 2 .

5. The high-strength, low-weight polyurethane composite board according to claim 1, characterized in that, The second polymer film (3), the third polymer film (7), and the fourth polymer film (8) are selected from high-density polyethylene film, with a thickness of 30-50 μm and a basis weight of 30-50 g / m³. 2 .

6. The high-strength, low-weight polyurethane composite board according to claim 1, characterized in that, The polyurethane foam (5) has a thickness of 5-15 mm and a density of 35±5 kg / m³. 3 .

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