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Polyurethane elastomer and preparation method thereof

A technology of polyurethane elastomers and poly pairs, which is applied in the field of polyurethane elastomers, can solve the problems of relatively large influence of coating aging performance, and achieve the effects of being conducive to sustainable development of the environment, reducing costs, and unsafe operation

Inactive Publication Date: 2010-10-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses two kinds of catalysts in the two-step reaction before and after, which has a relatively large impact on the aging performance of the coating in the later stage, and the alcoholysis product is solid, and the polybasic acid is added in the later stage, and the acid value needs to be controlled during the reaction process.

Method used

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  • Polyurethane elastomer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Clean and dry 300g of waste PET roll film, crush it into 5mm×5mm pieces, heat it at 100°C for 20min by infrared, add 350g of TEG, 3g of n-butyltin dilaurate, and heat it under 500W microwave at normal pressure Irradiate under low temperature for 8 minutes, wait for cooling, then add 300g castor oil, irradiate for 20min under 500W microwave normal pressure, then dehydrate in vacuum for 2h in an oil bath at 140°C, and obtain light yellow room temperature flowable liquid complex polyol A. The above process does not need nitrogen protection, and the hydroxyl value and molecular weight of the obtained complex polyol A are shown in Table 1.

[0027] Mix 33g of complex polyol A with 300g of PTMG1000, vacuum dehydrate at 110°C for 2h; cool to 40°C, add 130g of 2,4-TDI, react at 75°C for 2h, defoam for 0.5h, the NCO% of the obtained prepolymer It is 6.84%; heat up to 90°C, add 82g of preheated and molten MOCA, stir evenly, defoam for 5 minutes, pour into a preheated mold, solidi...

Embodiment 2

[0030]Clean and dry 300g of waste plastic bottles, crush them into pieces of 5mm×5mm, heat them by infrared at 90°C for 30min, add 400g of PEG200, 3g of n-butyltin dilaurate, and put them under 500W microwave normal pressure Irradiate for 8 minutes, wait for cooling, then add 300g castor oil, irradiate for 20 minutes under 500W microwave normal pressure, and then dehydrate in vacuum for 2 hours in an oil bath at 140°C to obtain light yellow liquid composite polyol B that can flow at room temperature. The above process does not need nitrogen protection, and the hydroxyl value and molecular weight of the obtained composite polyol B are shown in Table 1.

[0031] Mix 107.1g of complex polyol B with 250g of PTMG1000, vacuum dehydrate at 120°C for 1.5h; cool to 40°C, add 154g of 2,4-TDI, react at 70°C for 3h, defoam for 0.5h, the obtained prepolymer NCO% is 6.656%; heat up to 90°C, add 89.3g of preheated and molten MOCA, stir evenly, defoam for 4min, pour into a preheated mold, cur...

Embodiment 3

[0033] 300 parts by weight of waste PET plastic bottles were cleaned, dried, crushed into 5mm×5mm fragments, heated by infrared at 100°C for 20min, added 300g of DEG, 2.6g of n-butyltin dilaurate, and heated under 550W microwave Press down and irradiate for 7 minutes, wait for cooling, then add 180g of castor oil, irradiate for 17min under 550W microwave normal pressure, and then dehydrate in vacuum for 2h in an oil bath at 140°C to obtain light yellow liquid complex polyol C that can flow at room temperature . The above process does not require nitrogen protection, and the hydroxyl value and molecular weight of the obtained composite polyol C are shown in Table 1.

[0034] Mix 33g of C complex polyol with 300g of PTMG1000, vacuum dehydrate at 120°C for 1.5h; cool to 40°C, add 130g of 2,4-TDI, react at 73°C for 2.5h, defoam for 0.5h, the obtained prepolymer NCO% is 6.84%; heat up to 95°C, add 82g of preheated and molten MOCA, stir evenly, defoam for 5min, pour into a preheate...

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Abstract

The invention discloses a polyurethane elastomer and a preparation method thereof. The method comprises the following steps: alcoholysis of waste diethylene terephthalate chips and dihydric alcohol, and transesterification after adding castor oil, wherein the two reactions are both microwave reactions under the atmospheric pressure with di-n-butyltin dilaurate as a catalyst; and synthesis of prepolymer with mixture of pluronic polyol and polyether as the soft section of the polyurethane elastomer as well as polyisocyanate, and curing with a chain extender, thereby obtaining the polyurethane elastomer. Since the pluronic polyol which is synthesized with the cheap renewable raw material castor oil and the life waste polyester is mixed in the soft section of the synthetic polyurethane elastomer, the invention eases the problem of high cost of high-polymer chemical raw materials caused by the energy shortage, and simultaneously obtains the novel polyurethane elastomer which has the advantages of high hardness, high tensile strength, high tear resistance and high modulus.

Description

technical field [0001] The invention relates to a polyurethane elastomer, in particular to a polyurethane elastomer and a preparation method thereof; in the method, a composite multi-element compound synthesized from cheap renewable raw material castor oil and household waste polyester is mixed into the soft segment of the synthetic polyurethane elastomer alcohol. Background technique [0002] Polyethylene terephthalate (PET) material is widely used in fibers, films, beverage bottles due to its good mechanical properties, excellent heat resistance, chemical resistance, transparent color, non-toxic and harmless, etc. etc. are in production. Thereby more and more waste PET is discharged into nature every year. Due to the strong chemical inertia of PET, it is difficult to be naturally degraded by air or microorganisms. Therefore, although waste PET will not directly pollute the environment or directly endanger human safety, it will gradually accumulate and occupy a lot of spa...

Claims

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Application Information

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IPC IPC(8): C08G18/68C08G18/66C08G18/12
Inventor 赵冉黄承亚
Owner SOUTH CHINA UNIV OF TECH
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