Sound-absorbing composite and preparation method thereof
A sound-absorbing composite material, polyurethane sponge technology, applied in the direction of noise suppression, chemical instruments and methods, lamination devices, etc., can solve the problems of unfavorable application, high density of lead plate, increase of vehicle weight, etc., and achieve excellent sound absorption and drop Noise performance, small density, small thermal conductivity effect
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[0043] The present invention also provides a method for preparing a sound-absorbing composite material, comprising the following steps:
[0044] The double-sided adhesive is placed between the polyurethane sponge and the melamine sponge, and then heat-compressed to obtain a semi-finished sound-absorbing composite material. The thickness ratio of the melamine sponge to the polyurethane sponge is 1:1.5 to 1:5;
[0045] An adhesive is coated on the melamine sponge of the semi-finished sound-absorbing composite material to form an adhesive layer to obtain a sound-absorbing composite material.
[0046] In the present invention, firstly, double-sided adhesive is placed between the melamine sponge and the polyurethane sponge with a thickness ratio of 1:1.5 to 1:5, and then heat-compressed and compounded to obtain a semi-finished sound-absorbing composite material.
[0047] The present invention uses polyurethane sponge as a raw material. The polyurethane sponge is a kind of soft poly...
Embodiment 1
[0064] figure 1 The flow chart for the preparation of the sound-absorbing composite material provided in Example 1 of the present invention. see figure 1 , the melamine sponge block is peeled off and cut into a melamine sponge sheet with a thickness of 10mm, the polyurethane sponge block is peeled and cut into a polyurethane sponge sheet with a thickness of 15mm, the double-sided adhesive is placed between the polyurethane sponge sheet and the melamine sponge sheet, and then Carry out hot-press lamination to obtain a semi-finished sound-absorbing composite material; the temperature of the hot-press lamination is 50°C, the pressure is 5MPa, and the time is 60s;
[0065] Apply adhesive on the melamine sponge of the semi-finished sound-absorbing composite material to form an adhesive layer with a thickness of 0.05mm, and then use a cutting machine to cut and trim the edge to obtain the finished sound-absorbing composite material, melamine sponge The thickness ratio with polyure...
Embodiment 2
[0073] The melamine sponge block is peeled off and cut into a melamine sponge sheet with a thickness of 10mm, the polyurethane sponge block is peeled and cut into a polyurethane sponge sheet with a thickness of 25mm, the double-sided adhesive is placed between the polyurethane sponge sheet and the melamine sponge sheet, and then Hot-pressing composite to obtain a semi-finished sound-absorbing composite material; the temperature of the hot-pressing composite is 80°C, the pressure is 1MPa, and the time is 20s;
[0074] Apply adhesive on the melamine sponge of the semi-finished sound-absorbing composite material to form an adhesive layer with a thickness of 0.05mm, and then use a cutting machine to cut and trim the edge to obtain the finished sound-absorbing composite material, melamine sponge The thickness ratio with polyurethane sponge is 1:2.5.
[0075] After the sound-absorbing composite material is obtained, its sound-absorbing performance is tested according to the method d...
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