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Preparation method of low-deformation antibacterial polyurethane automobile shock absorption bumper block

A technology of automobile shock absorption and low deformation, which is applied in the field of polymer material preparation, can solve the problems of yellowing of light-colored products, large deformation of buffer blocks, and material fracture, etc., and achieves short validity period, good impact resistance and poor heat resistance. Effect

Inactive Publication Date: 2016-01-13
江苏邦博聚氨酯新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the defects of the above-mentioned existing polyurethane automobile buffer block products, the present invention provides a polyurethane automobile buffer block with good antibacterial performance and fatigue resistance durability to solve the problem of large deformation of the buffer block after fatigue and under suitable temperature and humidity conditions. It is easy to be hydrolyzed by fungi catalyzed, aged and produce discoloration and odor, leading to material breakage and yellowing of light-colored products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] After the polyester polyol component with a number average molecular weight of 2000±200 is melted in an oven at 70-75°C, it is directly fed into the polyol tank through a feed pump without adding any antibacterial agent. Add 500g of the polyol into a 2-liter reactor, add 15g of additives, including tertiary amine catalysts, water and organosiloxane, add 10g of castor oil, raise the temperature of the material to 80°C, and add an excess of 4 , 4-diphenylmethane diisocyanate, heat preservation for 2h to obtain a prepolymer with a -NCO (isocyanate group) content of 14%. The prepolymer and polyol were mixed and poured into a mold at 50°C according to the mass ratio of 1.5:1, and the mixing speed of the mixing head was 15000 rpm. After pre-aging for 12 minutes, demould, and then put into an oven at 70°C for aging for 24 hours to obtain the finished product and test piece A.

Embodiment 2

[0025] After the polyester polyol component with a number average molecular weight of 2000±200 is melted in an oven at 70-75°C, it is directly fed into the polyol tank through a feed pump without adding any antibacterial agent. Add 500g of the polyol into a 2-liter reactor, add 15g of additives, including tertiary amine catalysts, water and organosiloxane, add 2.5g of castor oil, raise the temperature of the material to 80°C, and add excess 4,4-Diphenylmethane diisocyanate was incubated for 2 hours to obtain a prepolymer with a -NCO content of 14%. The prepolymer and polyol were mixed and poured into a mold at 50°C according to the mass ratio of 1.5:1, and the mixing speed of the mixing head was 15000 rpm. After pre-curing for 12 minutes, demoulding, and then aging in an oven at a temperature of 70°C for 24 hours to obtain the finished product and test piece B.

Embodiment 3

[0027] The polyester polyol component with a number-average molecular weight of 2000±200 is added to the polyol kettle after being melted in an oven at 70-75°C. Add 500g of the polyol to a 2-liter reactor, add 15g of additives, including tertiary amine catalysts, water and organosiloxane, add 2.5g of sorbic acid, raise the temperature of the material to 80°C, and add excess 4,4-Diphenylmethane diisocyanate was incubated for 2 hours to obtain a prepolymer with a -NCO content of 14%. The prepolymer and polyol were mixed and poured into a mold at 50°C according to the mass ratio of 1.5:1, and the mixing speed of the mixing head was 15000 rpm. After pre-curing for 12 minutes, demoulding, and then aging in an oven at a temperature of 70°C for 24 hours to obtain the product and test piece C.

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Abstract

The invention relates to a preparation method of a low-deformation antibacterial polyurethane automobile shock absorption bumper block. The preparation method comprises the steps of preparing low-deformation antibacterial polyol, preparing a prepolymer, performing casting molding, pre-curing and demolding, and performing post curing to obtain the low-deformation antibacterial polyurethane automobile shock absorption bumper block. According to the preparation method, as polyester polyol of which the number-average molecular weight is 2000+ / -200, castor oil which accounts for 0.5-2% of the mass of the polyester polyol and an antibacterial agent which accounts for 0.5-2% of the mass of the polyester polyol are adopted, and a tertiary amine catalyst, water and organo-siloxane which account for 3+ / -0.5% of the total mass are added as raw materials, on the premise that other performances of the polyurethane automobile shock absorption bumper block are not influenced, the after-fatigue deformation of the bumper block is reduced, the antibacterial property of the bumper block is improved, the phenomena of fungus catalytic hydrolysis aging, color deterioration, material fracture, light-colored product yellowing and the like are avoided, and meanwhile, the problem that part of the antibacterial gent is unstable and easy to hydrolyze is solved, thereby meeting requirements on the antibacterial property of the automobile bumper block by middle and high automobile markets.

Description

technical field [0001] The invention belongs to the field of polymer material preparation, and relates to the preparation technology of a polyurethane automobile shock-absorbing buffer block, in particular to a preparation method of a low-deformation antibacterial polyurethane automobile shock-absorbing buffer block. Background technique [0002] Polyurethane microcellular elastomer is a material with properties between elastomers and foam materials. The density is between foam and solid core materials. The pore size distribution of the cells is relatively uniform, taking into account the foam's light weight and good impact resistance. , energy absorption, good cushioning performance, high strength and good wear resistance of elastomers, widely used in shock-absorbing materials, sealing, shoemaking, solid tires, etc., its excellent static compression and dynamic fatigue durability mechanical properties, It is especially suitable for anti-seismic and damping systems, and the ...

Claims

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Application Information

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IPC IPC(8): C08L75/06C08G18/66C08G18/42C08G18/36C08G18/10
Inventor 洪中海施宝玉洪哲淞张东芝葛晨尚昱星
Owner 江苏邦博聚氨酯新材料有限公司
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