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Preparation method of soft thermoplastic polyurethane elastomers

A technology of thermoplastic polyurethane and polyurethane prepolymer, which is applied in the field of preparation of soft thermoplastic polyurethane elastomer, which can solve the problems of easy surface depression, poor mold release, sticky products, etc., and achieve smooth surface, low hardness and easy mold release Effect

Active Publication Date: 2014-08-27
苏州奥斯汀新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the amount of hard segment is reduced to less than the amount required for the production of Shore A80 TPU, the obtained product will be sticky and poorly cured, which is manifested as poor mold release when injection molding and severe shrinkage. It is impossible to guarantee economical performance with this type of TPU. Acceptable Injection Molding Cycle Time
High-hardness TPU has a high content of hard segments and a high degree of aggregation of hard segments, which makes TPU brittle, and the processing temperature range is generally narrow, resulting in defects in the product and easy dents on the surface
[0004] At present, there are two methods for domestic production of soft thermoplastic polyurethane elastomers: one is to reduce the hard segment content, but the obtained product is sticky and poorly cured, which is characterized by poor mold release during injection molding and severe shrinkage. One is obtained by adding a plasticizer, but after a long period of storage, the plasticizer will migrate to the surface of the product, contaminate the product and the objects in contact with the product, so the application is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 240g of polyol formed by polycondensation of adipic acid and neopentyl glycol, 0.5g of stannous octoate, and 0.5g of 2,6-di-tert-butyl-4-methylphenol into a 1-liter reactor. The temperature is increased to 150°C at a rate of min, and the vacuum degree reaches -0.085MPa, and dehydration is performed at this temperature for 1 hour. Then it was cooled to 75°C, and the vacuum was released by blowing in nitrogen. 240 g of 4,4-diphenylmethane diisocyanate was heated to 43° C., and then added to the above-mentioned mixed polyol to obtain a polyurethane prepolymer. 36 g of polymer linear monool and 36 g of chain extender 1,4-butanediol were added to obtain a thermoplastic polyurethane elastomer. Pour the above-mentioned elastomer into a clean and dry polytetrafluoroethylene tray, place it horizontally in a vacuum oven at 90°C, maintain a vacuum of -0.085MPa, and take it out after 10 hours to obtain a moisture-permeable thermoplastic polyurethane elastomer.

[0025] The main ...

Embodiment 2

[0027] Add 240g of polyol formed by polycondensation of suberic acid and neopentyl glycol, 1.0g of dibutyltin dilaurate, and tetrakis(4-hydroxy-3,5-tert-butylphenylpropionic acid) into a 1-liter reactor. 0.5g of pentaerythritol ester, heated to 180°C at a rate of 40°C / min, vacuum degree reached -0.09MPa, dehydrated at this temperature for 2h. Then it was cooled to 70°C, and the vacuum was released by introducing nitrogen gas. 240 g of toluene diisocyanate was heated to 45° C., and then added to the above-mentioned mixed polyol to obtain a polyurethane prepolymer. 36 g of polymer linear monool and 48 g of chain extender 1,3-propanediol were added to obtain a thermoplastic polyurethane elastomer. Pour the above-mentioned elastomer into a clean and dry polytetrafluoroethylene tray, place it horizontally in a vacuum oven at 120°C, keep the vacuum at -0.09MPa, and take it out after 12 hours to obtain a moisture-permeable thermoplastic polyurethane elastomer.

[0028] The main techni...

Embodiment 3

[0030] Add 240g of polyol formed by polycondensation of suberic acid and neopentyl glycol, 2.4g of dibutyltin dilaurate, and octadecyl 3,5-di-tert-butyl-4-hydroxyphenylpropionate into a 1-liter reactor 0.5g, heated to 150°C at a rate of 30°C / min, vacuum reached -0.1MPa, dehydrated at this temperature for 2h. Then it was cooled to 75°C, and the vacuum was released by blowing in nitrogen. 240 g of 4,4-diphenylmethane diisocyanate was heated to 44° C., and then added to the above-mentioned mixed polyol to obtain a polyurethane prepolymer. Add 36 g of polymer linear monool and 30 g of chain extender 1,4-cyclohexanol and mechanically stir at 1500 rpm for 120 seconds to obtain a thermoplastic polyurethane elastomer. Pour the elastomer into a clean and dry polytetrafluoroethylene tray, place it horizontally in a vacuum oven at 100°C, maintain a vacuum of -0.1 MPa, and take it out after 8 hours to obtain a moisture-permeable thermoplastic polyurethane elastomer.

[0031] The main techn...

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Abstract

The invention discloses a preparation method of soft thermoplastic polyurethane elastomers. The preparation method comprises the following steps: 1) adding a catalyst, an anti-aging agent and branched hydroxyl end capping polyester polyol into a reaction kettle, dewatering under heating vacuum conditions, subsequently cooling and adding nitrogen to release vacuum; heating diphenyl methane diisocyanate and then adding the heated diphenyl methane diisocyanate into the reaction kettle to uniformly stir and obtain polyurethane prepolymers; 2) uniformly mixing polymer linear mono-alcohols, a polymer linear glycol chain extender with the polyurethane prepolymers obtained in the step 1) to obtain thermoplastic polyurethane elastomers; then drying the thermoplastic polyurethane elastomers under the heating vacuum conditions to obtain the soft thermoplastic polyurethane elastomers. The soft thermoplastic polyurethane elastomers prepared by using the method are mainly applied to production of shoe soles, handlebar grips, sealing components, dustproof caps and the like; the products are low in hardness and smooth in surfaces.

Description

Technical field [0001] The invention relates to a method for preparing a thermoplastic polyurethane elastomer, in particular to a method for preparing a soft thermoplastic polyurethane elastomer. Background technique [0002] Thermoplastic polyurethane elastomer (also known as TPU) new material is called "epoch-making new polymer material" and is currently one of the world's six most promising synthetic materials. [0003] The hardness of TPU is mainly determined by the ratio of hard segment (formed by the reaction of chain extender / chain extender and isocyanate group) to soft segment (formed by the reaction of polyol and isocyanate group). If the amount of hard segment is reduced below the amount required to produce Shore A80TPU, the resulting product will be sticky and poorly cured, which is manifested by poor mold release during injection molding and severe shrinkage. This type of TPU cannot guarantee economic Acceptable injection molding cycle time. High-hardness TPU has a hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/32C08G18/10
CPCC08F2410/00C08G18/10C08G18/4238C08G18/664C08K5/13C08K5/1345C08K2201/014C08G18/3206C08G18/3212
Inventor 艾玲汪泽恒杨廷廷陈海风
Owner 苏州奥斯汀新材料科技有限公司