Automobile side wall cavity sound absorption cotton and preparation method thereof
一种吸音棉、空腔的技术,应用在车辆部件、运输和包装等方向,能够解决无法有效阻隔胎噪、路噪、风噪等问题,达到设计灵活的效果
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Embodiment 1
[0036] 1. Preparation of crushed foam
[0037] Broken foam is a polyurethane foam material, which is composed of two components, A and B, and the weight ratio of the two components is: 100:45. The content of each raw material in component A is shown in Table 1, and component B is isocyanate compound, specifically polymethylene polyphenyl polyisocyanate. Among them, the gel catalyst is composed of 25% triethylenediamine and 75% 1,4 butanediol. As the cell opener, polybutadiene and fumed silica were used.
[0038] Concrete preparation steps are as follows:
[0039] (1) Mix the raw materials in component A, and add component B into the foaming machine separately, and set the flow rate of component A and component B: when setting the flow rate, turn on the high pressure, rotate the flowmeter, and set the flow rate to The actual high and low pressure flow is filled in, and the flow rate of components A and B is set as component A material: 240±10g / s B component material: 120±10g...
Embodiment 2
[0049] 1. Preparation of crushed foam
[0050] Broken foam is a polyurethane foam material, which is composed of two components, A and B, and the weight ratio of the two components is: 100:50. The content of each raw material in component A is shown in Table 1, and component B is isocyanate compound, specifically polymethylene polyphenyl polyisocyanate. Among them, the gel catalyst is composed of 25% triethylenediamine and 75% 1,4 butanediol. As the cell opener, polybutadiene and fumed silica were used.
[0051] Concrete preparation steps are as follows:
[0052] (1) Mix the raw materials in component A, and add component B into the foaming machine separately, and set the flow rate of component A and component B: when setting the flow rate, turn on the high pressure, rotate the flowmeter, and set the flow rate to The actual high and low pressure flow is filled in, and the flow rate of components A and B is set as component A material: 240±10g / s B component material: 120±10g...
Embodiment 3
[0061] 1. Preparation of crushed foam
[0062] Broken foam is a polyurethane foam material, which is composed of two components, A and B, and the weight ratio of the two components is: 100:50. The content of each raw material in component A is shown in Table 1, and component B is isocyanate compound, specifically polymethylene polyphenyl polyisocyanate. Among them, the gel catalyst is composed of 25% triethylenediamine and 75% 1,4 butanediol. As the cell opener, polybutadiene and fumed silica were used.
[0063] Concrete preparation steps are as follows:
[0064] (1) Mix the raw materials in component A, and add component B into the foaming machine separately, and set the flow rate of component A and component B: when setting the flow rate, turn on the high pressure, rotate the flowmeter, and set the flow rate to The actual high and low pressure flow is filled in, and the flow rate of components A and B is set as component A material: 240±10g / s B component material: 120±10g...
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