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CN-121973380-A - Sound-absorbing and sound-insulating composite material and preparation method thereof

CN121973380ACN 121973380 ACN121973380 ACN 121973380ACN-121973380-A

Abstract

The invention discloses a sound-absorbing and sound-insulating composite material and a preparation method thereof, wherein the preparation method comprises the steps of opening and carding polyester fibers to form a net, spraying hot melt adhesive powder and performing hot press molding to obtain a polyester fiber layer; stirring and mixing the modified butyl rubber, polyether polyol, polyester polyol, deionized water, amine catalysts and organotin catalysts uniformly, adding isocyanate, and continuously stirring and mixing uniformly to obtain a mixture; the sound-absorbing and sound-insulating composite material has a three-layer structure, is integrated and compounded by combining a specific process, and achieves excellent sound-insulating and sound-absorbing effects by limiting the raw materials and the dosage of each layer.

Inventors

  • YANG QIONG
  • LIN JIANHUI
  • LIN ZHIWEI

Assignees

  • 佛山市置维胶粘制品有限公司

Dates

Publication Date
20260505
Application Date
20251224

Claims (10)

  1. 1. The preparation method of the sound-absorbing and sound-insulating composite material is characterized by comprising the following steps of: (a) Opening and carding the polyester fiber into a net, spraying hot melt adhesive powder, and performing hot press molding to obtain a polyester fiber layer; (b) Modifying butyl rubber by adopting a titanate coupling agent to obtain modified butyl rubber, then stirring and uniformly mixing the modified butyl rubber, polyether polyol, polyester polyol, deionized water, an amine catalyst and an organotin catalyst, and then adding isocyanate to continuously stir and uniformly mix to obtain a mixture; (c) Mixing butyl rubber, polyisobutene and petroleum resin, adding an antioxidant and half of barium sulfate, continuously mixing, adding polyester staple fibers and the rest of barium sulfate, continuously mixing, and pressing into a sheet to obtain a mixed sheet; (d) And paving a polyester fiber layer in a mould, pouring the mixture on the surface of the polyester fiber layer, covering the surface of the mixture with a mixing sheet, closing the mould, prepressing, heating and foaming, heating and boosting after the foaming pressure reaches a peak value, and cooling to obtain the sound-absorbing and sound-insulating composite material.
  2. 2. The preparation method of the polyester fiber according to claim 1, wherein in the step (a), the polyester fiber is hollow polyester staple fiber, the adding amount of the hot melt adhesive powder is 8% -12% of the mass of the polyester fiber, the hot melt adhesive powder is PES hot melt adhesive, the thickness of the polyester fiber layer is 8% -12 mm, and the density is 250% -350 g/m 2 .
  3. 3. The method according to claim 1, wherein in the step (a), the hot press molding temperature is 140 to 150 ℃.
  4. 4. The preparation method of the modified butyl rubber according to claim 1, wherein in the step (b), the butyl rubber is modified by adopting a titanate coupling agent, wherein the method comprises the steps of spraying an ethanol solution of the titanate coupling agent on the surface of the butyl rubber, uniformly stirring and mixing for 15-30 min at 60-80 ℃, and then ventilating and airing to obtain the modified butyl rubber, and the dosage of the titanate coupling agent is 1-2% of the mass of the butyl rubber.
  5. 5. The method according to claim 1, wherein in the step (b), the modified butyl rubber, polyether polyol, polyester polyol, deionized water, amine catalyst, organotin catalyst and isocyanate are used in the following amounts: 20-30 parts of modified butyl rubber, 90-100 parts of polyether polyol, 25-35 parts of polyester polyol, 1-2 parts of deionized water, 0.3-0.5 part of amine catalyst, 0.1-0.2 part of organotin catalyst and 100-120 parts of isocyanate.
  6. 6. The method according to claim 1, wherein in the step (c), the butyl rubber, polyisobutylene, petroleum resin, antioxidant, barium sulfate and polyester staple are used in the following amounts: 35-45 parts of butyl rubber, 20-30 parts of polyisobutylene, 15-25 parts of petroleum resin, 0.3-0.8 part of antioxidant, 25-35 parts of barium sulfate and 10-15 parts of polyester staple fiber.
  7. 7. The method according to claim 1, wherein in the step (c), the thickness of the kneaded sheet is 1.2 to 2mm and the density is 2200 to 2800g/m 2 .
  8. 8. The method according to claim 1, wherein in the step (d), the pre-pressing pressure is 0.4-0.6 mpa, the temperature rise and foaming temperature is 75-85 ℃, the temperature rise and pressure rise value is 90-95 ℃, and the pressure is 1.5-2.0 mpa.
  9. 9. The method according to claim 1, wherein in the step (d), the thickness of the mixture after foaming and shaping is 6-10 mm.
  10. 10. The sound-absorbing and sound-insulating composite material produced by the production method according to any one of claims 1 to 9.

Description

Sound-absorbing and sound-insulating composite material and preparation method thereof Technical Field The invention relates to the technical field of sound-absorbing and sound-insulating materials, in particular to a sound-absorbing and sound-insulating composite material and a preparation method thereof. Background With the increasing demands of consumers on the mute quality of home appliances, the noise reduction design in the interior of the appliances is of great importance. In the prior art, most of the sound insulation materials commonly used for electrical appliances are single or simple composite materials, for example: The pure polyester fiber cotton has good sound absorption performance, light weight and environment protection, but has limited sound insulation (especially low-frequency sound insulation) and damping performance, lacks rigidity and is difficult to independently support. Polyurethane Foam (PU Foam) is divided into open cell and closed cell. The open cell foam gives good sound absorption but poor sound insulation, and the closed cell foam gives slightly better sound insulation but poor sound absorption. Both the suppression effects on middle and low frequency noise are not ideal, and the aging problem can exist in long-term use. Butyl rubber damping sheet has excellent damping and sound-insulating performance, especially good at suppressing structure vibration conduction and medium-low frequency noise, but has high density, high cost, difficult processing and no sound absorption. In view of this, the present invention has been made. Disclosure of Invention The invention aims to provide a sound-absorbing and sound-insulating composite material and a preparation method thereof. In order to achieve the above object of the present invention, the following technical solutions are specifically adopted: the first aspect of the invention provides a preparation method of a sound-absorbing and sound-insulating composite material, which comprises the following steps: (a) Opening and carding the polyester fiber into a net, spraying hot melt adhesive powder, and performing hot press molding to obtain a polyester fiber layer; (b) Modifying butyl rubber by adopting a titanate coupling agent to obtain modified butyl rubber, then stirring and uniformly mixing the modified butyl rubber, polyether polyol, polyester polyol, deionized water, an amine catalyst and an organotin catalyst, and then adding isocyanate to continuously stir and uniformly mix to obtain a mixture; (c) Mixing butyl rubber, polyisobutene and petroleum resin, adding an antioxidant and half of barium sulfate, continuously mixing, adding polyester staple fibers and the rest of barium sulfate, continuously mixing, and pressing into a sheet to obtain a mixed sheet; (d) And paving a polyester fiber layer in a mould, pouring the mixture on the surface of the polyester fiber layer, covering the surface of the mixture with a mixing sheet, closing the mould, prepressing, heating and foaming, heating and boosting after the foaming pressure reaches a peak value, and cooling to obtain the sound-absorbing and sound-insulating composite material. Preferably, in the step (a), the polyester fibers are hollow polyester staple fibers, the adding amount of the hot melt adhesive powder is 8-12% of the mass of the polyester fibers, the hot melt adhesive powder is PES hot melt adhesive, the thickness of the polyester fiber layer is 8-12 mm, and the density is 250-350 g/m 2. Preferably, in the step (a), the hot press molding temperature is 140-150 ℃. Preferably, in the step (b), the modification treatment of the butyl rubber by adopting the titanate coupling agent comprises the steps of spraying an ethanol solution of the titanate coupling agent on the surface of the butyl rubber, uniformly stirring and mixing for 15-30 min at 60-80 ℃, and then ventilating and airing to obtain the modified butyl rubber, wherein the dosage of the titanate coupling agent is 1-2% of the mass of the butyl rubber. Preferably, in the step (b), the amounts of the modified butyl rubber, the polyether polyol, the polyester polyol, the deionized water, the amine catalyst, the organotin catalyst and the isocyanate are as follows: 20-30 parts of modified butyl rubber, 90-100 parts of polyether polyol, 25-35 parts of polyester polyol, 1-2 parts of deionized water, 0.3-0.5 part of amine catalyst, 0.1-0.2 part of organotin catalyst and 100-120 parts of isocyanate. Preferably, in the step (c), the butyl rubber, polyisobutylene, petroleum resin, antioxidant, barium sulfate and polyester staple are used in the following amounts: 35-45 parts of butyl rubber, 20-30 parts of polyisobutylene, 15-25 parts of petroleum resin, 0.3-0.8 part of antioxidant, 25-35 parts of barium sulfate and 10-15 parts of polyester staple fiber. Preferably, in the step (c), the thickness of the mixed sheet is 1.2-2 mm, and the density is 2200-2800 g/m2. Preferably, in the step (d), the pre-pressing pressure is 0.4-0