Automobile side wall cavity sound absorption cotton and preparation method thereof
A technology of sound-absorbing cotton and cavity, which is applied to vehicle parts, transportation and packaging, etc. It can solve the problems of being unable to effectively block tire noise, road noise, wind noise, etc., and achieve the effect of flexible design
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[0035] Example 1
[0036] 1. Preparation of broken foam
[0037] Broken foam is a polyurethane foam material, composed of two components A and B. The weight ratio of the two components is 100:45. The content of each raw material in the A component is shown in Table 1, and the B component is an isocyanate compound, specifically polymethylene polyphenyl polyisocyanate is used. Among them, the gel catalyst is composed of 25% triethylenediamine and 75% 1,4-butanediol. Polybutadiene and fumed silica are used as the opener.
[0038] The specific preparation steps are as follows:
[0039] (1) Mix the raw materials in component A and add component B to the foaming machine separately, and set the flow of component A and component B: when setting the flow, set the high pressure, the rotary flowmeter, and the flow setting The actual high and low pressure flow rates are filled in, and the flow rates of component A and component B are set to component A material: 240±10g / s component B material:...
Example Embodiment
[0048] Example 2
[0049] 1. Preparation of broken foam
[0050] Broken foam is a polyurethane foam material, which is composed of two components A and B. The weight ratio of the two components is 100:50. The content of each raw material in the A component is shown in Table 1, and the B component is an isocyanate compound, specifically polymethylene polyphenyl polyisocyanate is used. Among them, the gel catalyst is composed of 25% triethylenediamine and 75% 1,4-butanediol. Polybutadiene and fumed silica are used as the opener.
[0051] The specific preparation steps are as follows:
[0052] (1) Mix the raw materials in component A and add component B to the foaming machine separately, and set the flow of component A and component B: when setting the flow, set the high pressure, the rotary flowmeter, and the flow setting The actual high and low pressure flow rates are filled in, and the flow rates of component A and component B are set to component A material: 240±10g / s component B ...
Example Embodiment
[0060] Example 3
[0061] 1. Preparation of broken foam
[0062] Broken foam is a polyurethane foam material, which is composed of two components A and B. The weight ratio of the two components is 100:50. The content of each raw material in the A component is shown in Table 1, and the B component is an isocyanate compound, specifically polymethylene polyphenyl polyisocyanate is used. Among them, the gel catalyst is composed of 25% triethylenediamine and 75% 1,4-butanediol. Polybutadiene and fumed silica are used as the opener.
[0063] The specific preparation steps are as follows:
[0064] (1) Mix the raw materials in component A and add component B to the foaming machine separately, and set the flow of component A and component B: when setting the flow, set the high pressure, the rotary flowmeter, and the flow setting The actual high and low pressure flow rates are filled in, and the flow rates of component A and component B are set to component A material: 240±10g / s component B ...
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