Ultralight high-rebound shock-absorbing sound-absorbing cotton and production process thereof

Abstract

The present application relates to the technical field of sound-absorbing cotton, and proposes an ultralight high-rebound shock-absorbing sound-absorbing cotton, which comprises an elastic sound-absorbing layer and a non-woven fabric layer, and the elastic sound-absorbing layer is provided with the non-woven fabric layer on both sides; the raw material of the elastic sound-absorbing layer comprises the following components in parts by mass: polyurethane elastomer 40-50 parts, flame retardant 8-10 parts, foaming agent 2-3 parts, hollow polyester fiber 40-50 parts, and epoxy nitrile compound 5-15 parts. Through the above technical solution, the problem of low strength of the sound-absorbing cotton prepared from the hollow polyester fiber in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sound-absorbing cotton, in particular to a super-light high-rebound shock-absorbing sound-absorbing cotton and a production process thereof. BACKGROUND

[0002] Noise pollution is considered as a kind of physical environmental pollution that has a great impact on people's daily life, which not only affects people's health but also affects the quality of life. Nowadays, noise pollution mainly comes from transportation, and cars are important means of transportation for people in daily life.

[0003] Car sound insulation can not only reduce the noise in the car during driving, but also reduce the noise outside the car. At present, the products used for car sound insulation include two kinds of materials, namely sound insulation pads and sound-absorbing cotton. Compared with sound insulation pads, sound-absorbing cotton has better sound insulation effect because it can absorb the noise generated by the vibration that shock-absorbing glue cannot deal with, and is very popular in the market.

[0004] With the development of society, people have added other functions to sound-absorbing cotton in addition to sound insulation, such as light weight and high rebound. The light weight feature makes it more convenient to install and use, and compared with traditional heavy sound insulation materials, this material can greatly reduce installation and maintenance costs; the high rebound feature enables it to have a shock-absorbing effect when subjected to external impact and can quickly recover its shape, thereby effectively absorbing and dispersing impact force to protect internal equipment and personnel from harm.

[0005] Hollow polyester fiber has a hollow structure and is light in weight and good in elasticity. Its application in sound-absorbing cotton can provide good sound insulation performance and rebound elasticity. However, its disadvantage is poor adhesion with elastomers, resulting in low strength of the sound-absorbing cotton. SUMMARY

[0006] The present application provides a super-light high-rebound shock-absorbing sound-absorbing cotton and a production process thereof, which solves the problem of low strength of sound-absorbing cotton prepared from hollow polyester fiber in the related art.

[0007] The technical solution of the present application is as follows:

[0008] A super-light high-rebound shock-absorbing sound-absorbing cotton, comprising an elastic sound-absorbing layer and a non-woven fabric layer, the elastic sound-absorbing layer is provided with the non-woven fabric layer on both sides, and the raw material of the elastic sound-absorbing layer comprises the following components in mass fraction: polyurethane elastomer 40-50 parts, flame retardant 8-10 parts, foaming agent 2-3 parts, hollow polyester fiber 40-50 parts, and epoxy nitrile compound 5-15 parts.

[0009] As a further technical solution, the epoxy nitrile compound comprises one or both of 2-(2,3-epoxypropoxy) benzonitrile and 4-(2-oxazolidinylmethoxy) benzonitrile.

[0010] As a further technical solution, the epoxy nitrile compound is 4-(2-oxirane methoxy) benzonitrile.

[0011] As a further technical solution, the mass ratio of the hollow polyester fiber and the epoxy nitrile compound is 45:8~12.

[0012] The present application limits the mass ratio of the hollow polyester fiber and the epoxy nitrile compound to 45:8~12, further improving the strength and resilience of the sound-absorbing cotton prepared from the hollow polyester fiber.

[0013] As a further technical solution, the polyurethane elastomer is a pre-foamed polyurethane elastomer.

[0014] The preparation method of the pre-foamed polyurethane elastomer comprises the following steps: after drying the thermoplastic polyurethane elastomer, adding thermal expansion microspheres and uniformly mixing, extruding and granulating to obtain the pre-foamed polyurethane elastomer.

[0015] As a further technical solution, the mass ratio of the thermoplastic polyurethane elastomer and the thermal expansion microspheres is 20~25:1.

[0016] As a further technical solution, the flame retardant comprises one or both of aluminum hydroxide and magnesium hydroxide.

[0017] As a further technical solution, the foaming agent comprises one or more of foaming agent H, foaming agent TSH, and foaming agent VAZO.

[0018] As a further technical solution, the preparation method of the elastic sound-absorbing layer comprises the following steps: mixing the polyurethane elastomer, the flame retardant, the foaming agent, the hollow polyester fiber and the epoxy nitrile compound according to the mass fraction, heating to 90~110℃, continuing to mix until uniform, curing, and aging to obtain the elastic sound-absorbing layer.

[0019] As a further technical solution, the aging temperature is 80~90℃, and the aging time is 8~10h.

[0020] The present application also proposes a production process of ultra-light high-resilience shock-absorbing sound-absorbing cotton, which coats glue on the upper and lower surfaces of the elastic sound-absorbing layer respectively, and then covers non-woven fabric hot-pressed to obtain the sound-absorbing cotton.

[0021] The working principle and beneficial effects of the present application are as follows:

[0022] The application provides a kind of super-light high-rebound shock-absorbing sound-absorbing cotton, by adding epoxy nitrile compound in elastic sound-absorbing layer, the strength and resilience of sound-absorbing cotton prepared by hollow polyester fiber are improved.The reason is that the epoxy group in epoxy nitrile compound can react with polyurethane elastomer, and the nitrile group can react with hollow polyester fiber, thereby enhancing the adhesion of hollow polyester fiber and elastomer.In addition, it can also improve the dispersibility of hollow polyester fiber in elastic sound-absorbing layer, and the strength and resilience of sound-absorbing cotton are improved. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the application will be clearly and completely described below in combination with the embodiments of the application.It is obvious that the described embodiments are only part of the embodiments of the application, not all the embodiments.Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0024] In the following examples and comparative examples, the thermoplastic polyurethane elastomer is thermoplastic polyurethane elastomer 1180A; the thermally expandable microspheres are Matsumoto thermally expandable microspheres F-230D; the hollow polyester fiber is hollow polyester staple fiber, model 6.67dtex x 32mm; the glue is JSW-3542 PUR hot melt adhesive.

[0025] Example 1

[0026] S1, 45 parts of thermoplastic polyurethane elastomer were dried at 85℃ for 1h, then 2 parts of thermally expandable microspheres were added and mixed uniformly, and then extruded and granulated at 160℃ to obtain pre-foamed polyurethane elastomer;

[0027] S2, 45 parts of pre-foamed polyurethane elastomer, 3 parts of aluminum hydroxide, 6 parts of magnesium hydroxide, 2.5 parts of foaming agent H, 45 parts of hollow polyester fiber and 5 parts of 2-(2,3-epoxypropoxy) phenyl cyanide were mixed, and then heated to 100℃ and mixed uniformly, then transferred to a mold, and then cured at 60℃ for 10h and then aged at 85℃ for 9h to obtain an elastic sound-absorbing layer;

[0028] S3, glue was coated on the upper and lower surfaces of the elastic sound-absorbing layer respectively, and then non-woven fabric was covered on the upper and lower surfaces respectively to form a sound-absorbing cotton.

[0029] Example 2

[0030] S1, 45 parts of thermoplastic polyurethane elastomer were dried at 85℃ for 1h, then 2 parts of thermally expandable microspheres were added and mixed uniformly, and then extruded and granulated at 160℃ to obtain pre-foamed polyurethane elastomer;

[0031] S2, 40 parts of pre-foamed polyurethane elastomer, 8 parts of aluminum hydroxide, 2 parts of foaming agent VAZO, 40 parts of hollow polyester fiber, 5 parts of 4-(2-oxirane methoxy) benzyl cyanide were mixed, and then uniformly mixed at 90°C, and then transferred to a mold, and then cured at 60°C for 10h, and then aged at 80°C for 10h to obtain an elastic sound-absorbing layer;

[0032] S3, after coating glue on the upper and lower surfaces of the elastic sound-absorbing layer respectively, non-woven fabric was covered on the upper and lower surfaces respectively to obtain a sound-absorbing cotton by hot pressing.

[0033] Example 3

[0034] S1, 50 parts of thermoplastic polyurethane elastomer were dried at 85°C for 1h, then 2 parts of heat-expandable microspheres were added and uniformly mixed, and then extruded and granulated at 160°C to obtain a pre-foamed polyurethane elastomer;

[0035] S2, 50 parts of pre-foamed polyurethane elastomer, 10 parts of magnesium hydroxide, 3 parts of foaming agent TSH, 50 parts of hollow polyester fiber, 2 parts of 2-(2,3-epoxy propoxy) benzyl cyanide, and 3 parts of 4-(2-oxirane methoxy) benzyl cyanide were mixed, and then uniformly mixed at 110°C, and then transferred to a mold, and then cured at 60°C for 10h, and then aged at 90°C for 8h to obtain an elastic sound-absorbing layer;

[0036] S3, after coating glue on the upper and lower surfaces of the elastic sound-absorbing layer respectively, non-woven fabric was covered on the upper and lower surfaces respectively to obtain a sound-absorbing cotton by hot pressing.

[0037] Example 4

[0038] S1, 45 parts of thermoplastic polyurethane elastomer were dried at 85°C for 1h, then 2 parts of heat-expandable microspheres were added and uniformly mixed, and then extruded and granulated at 160°C to obtain a pre-foamed polyurethane elastomer;

[0039] S2, 45 parts of pre-foamed polyurethane elastomer, 3 parts of aluminum hydroxide, 6 parts of magnesium hydroxide, 2.5 parts of foaming agent H, 45 parts of hollow polyester fiber, and 8 parts of 2-(2,3-epoxy propoxy) benzyl cyanide were mixed, and then uniformly mixed at 100°C, and then transferred to a mold, and then cured at 60°C for 10h, and then aged at 85°C for 9h to obtain an elastic sound-absorbing layer;

[0040] S3, after coating glue on the upper and lower surfaces of the elastic sound-absorbing layer respectively, non-woven fabric was covered on the upper and lower surfaces respectively to obtain a sound-absorbing cotton by hot pressing.

[0041] Example 5

[0042] S1, 45 parts of thermoplastic polyurethane elastomer were dried at 85°C for 1h, then 2 parts of heat-expandable microspheres were added and uniformly mixed, and then extruded and granulated at 160°C to obtain a pre-foamed polyurethane elastomer;

[0043] S2, 45 parts of pre-foamed polyurethane elastomer, 3 parts of aluminum hydroxide, 6 parts of magnesium hydroxide, 2.5 parts of foaming agent H, 45 parts of hollow polyester fiber, and 10 parts of 2-(2, 3-epoxy propoxy) benzene cyanide were mixed, and then uniformly mixed at 100°C, and then transferred to a mold, cured at 60°C for 10h, and then aged at 85°C for 9h to obtain an elastic sound-absorbing layer;

[0044] S3, after coating glue on the upper and lower surfaces of the elastic sound-absorbing layer respectively, hot-pressing non-woven fabric on the upper and lower surfaces respectively to obtain sound-absorbing cotton.

[0045] Example 6

[0046] S1, 45 parts of thermoplastic polyurethane elastomer were dried at 85°C for 1h, then 2 parts of heat-expandable microspheres were added and uniformly mixed, and then extruded and granulated at 160°C to obtain a pre-foamed polyurethane elastomer;

[0047] S2, 45 parts of pre-foamed polyurethane elastomer, 3 parts of aluminum hydroxide, 6 parts of magnesium hydroxide, 2.5 parts of foaming agent H, 45 parts of hollow polyester fiber, and 12 parts of 2-(2, 3-epoxy propoxy) benzene cyanide were mixed, and then uniformly mixed at 100°C, and then transferred to a mold, cured at 60°C for 10h, and then aged at 85°C for 9h to obtain an elastic sound-absorbing layer;

[0048] S3, after coating glue on the upper and lower surfaces of the elastic sound-absorbing layer respectively, hot-pressing non-woven fabric on the upper and lower surfaces respectively to obtain sound-absorbing cotton.

[0049] Example 7

[0050] S1, 45 parts of thermoplastic polyurethane elastomer were dried at 85°C for 1h, then 2 parts of heat-expandable microspheres were added and uniformly mixed, and then extruded and granulated at 160°C to obtain a pre-foamed polyurethane elastomer;

[0051] S2, 45 parts of pre-foamed polyurethane elastomer, 3 parts of aluminum hydroxide, 6 parts of magnesium hydroxide, 2.5 parts of foaming agent H, 45 parts of hollow polyester fiber, and 15 parts of 2-(2, 3-epoxy propoxy) benzene cyanide were mixed, and then uniformly mixed at 100°C, and then transferred to a mold, cured at 60°C for 10h, and then aged at 85°C for 9h to obtain an elastic sound-absorbing layer;

[0052] S3, after coating glue on the upper and lower surfaces of the elastic sound-absorbing layer respectively, hot-pressing non-woven fabric on the upper and lower surfaces respectively to obtain sound-absorbing cotton.

[0053] Example 8

[0054] S1, 45 parts of thermoplastic polyurethane elastomer were dried at 85°C for 1h, then 2 parts of heat-expandable microspheres were added and uniformly mixed, and then extruded and granulated at 160°C to obtain a pre-foamed polyurethane elastomer;

[0055] S2, 45 parts of pre-foamed polyurethane elastomer, 3 parts of aluminum hydroxide, 6 parts of magnesium hydroxide, 2.5 parts of foaming agent H, 45 parts of hollow polyester fiber, 10 parts of 4-(2-oxirane methoxy) benzonitrile were mixed, and then uniformly mixed at 100 DEG C, and then transferred to a mold, and then cured at 60 DEG C for 10 hours, and then aged at 85 DEG C for 9 hours, to obtain an elastic sound-absorbing layer;

[0056] S3, after coating glue on the upper and lower surfaces of the elastic sound-absorbing layer respectively, non-woven fabric was covered on the upper and lower surfaces respectively to obtain a sound-absorbing cotton.

[0057] Comparative Example 1

[0058] The difference from Example 1 is that no 2-(2,3-epoxypropoxy) benzonitrile is added.

[0059] The sound-absorbing cotton obtained in Examples 1-8 and Comparative Example 1 was tested for compression strength according to the method in GB / T 1041-2008, and for resilience according to the test method B in GB / T 12622-2008, and the test results are shown in Table 1.

[0060] Table 1 Strength and resilience of sound-absorbing cotton

[0061]

[0062] As shown in Table 1, the compression strength of the sound-absorbing cotton provided by the application is above 20.8 MPa, and the resilience is above 92.2%, which has high strength and good resilience.

[0063] Example 1 and Comparative Example 1, the epoxy nitrile compound is added in Example 1, and no epoxy nitrile compound is added in Comparative Example 1, the compression strength and resilience of the sound-absorbing cotton obtained in Example 1 are higher than those in Comparative Example 1, which shows that the addition of the epoxy nitrile compound can improve the strength and resilience of the sound-absorbing cotton.

[0064] Example 1 and Examples 4-8, the compression strength and resilience of the sound-absorbing cotton obtained in Examples 4-6 are higher than those in Example 1 and Example 7, which shows that when the mass ratio of hollow polyester fiber to epoxy nitrile compound is 45:8-12, the strength and resilience of the sound-absorbing cotton can be further improved.

[0065] The above is only a preferred embodiment of the application, and is not intended to limit the application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A kind of ultra-light high-rebound shock-absorbing sound-absorbing cotton, comprising elastic sound-absorbing layer and non-woven layer, the elastic sound-absorbing layer both sides are provided with the non-woven layer, it is characterized by, The raw material of the elastic sound-absorbing layer comprises the following components in parts by mass: polyurethane elastomer 40-50 parts, flame retardant 8-10 parts, foaming agent 2-3 parts, hollow polyester fiber 40-50 parts, and epoxy nitrile compound 5-15 parts; the epoxy nitrile compound comprises one or both of 2-(2,3-epoxypropoxy) benzonitrile and 4-(2-oxirane methoxy) benzonitrile.

2. The ultra-light high resilience sound absorbing and damping cotton according to claim 1, characterized in that, The epoxy nitrile compound is 4-(2-oxirane methoxy) benzonitrile.

3. The ultra-light high resilience sound absorbing and damping cotton according to claim 1, characterized in that, The mass ratio of the hollow polyester fiber to the epoxy nitrile compound is 45:8-12.

4. The ultra-light high resilience sound absorbing and damping cotton according to claim 1, characterized in that, The polyurethane elastomer is a pre-foamed polyurethane elastomer. The preparation method of the pre-foamed polyurethane elastomer comprises the following steps: after drying the thermoplastic polyurethane elastomer, adding heat-expandable microspheres and uniformly mixing, extruding and granulating to obtain the pre-foamed polyurethane elastomer.

5. The ultra-light high resilience sound absorbing and damping cotton according to claim 4, characterized in that, The mass ratio of the thermoplastic polyurethane elastomer to the heat-expandable microspheres is 20-25:

1.

6. The ultra-light high resilience sound absorbing and damping cotton according to claim 1, characterized in that, The flame retardant comprises one or both of aluminum hydroxide and magnesium hydroxide.

7. The ultra-light high resilience sound absorbing and damping cotton according to claim 1, characterized in that, The foaming agent comprises one or more of foaming agent H, foaming agent TSH, and foaming agent VAZO.

8. The ultra-light high resilience sound absorbing and damping cotton according to claim 1, characterized in that, The preparation method of the elastic sound-absorbing layer comprises the following steps: mixing the polyurethane elastomer, the flame retardant, the foaming agent, the hollow polyester fiber, and the epoxy nitrile compound according to the mass parts, heating to 90-110 DEG C, continuously mixing until uniform, solidifying, and aging to obtain the elastic sound-absorbing layer.

9. The production process of the ultra-light high-rebound shock-absorbing and sound-absorbing cotton according to any one of claims 1-8, characterized in that, After coating glue on the upper and lower surfaces of the elastic sound-absorbing layer, respectively, non-woven fabric is covered and hot-pressed to obtain sound-absorbing cotton.

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