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Preparation method of transparent film-grade thermoplastic polyurethane elastomer

A thermoplastic polyurethane and transparent film technology, applied in the field of thermoplastic polyurethane elastomer (TPU), to achieve good high and low temperature resistance, high tensile strength and elongation at break, and good aging resistance

Active Publication Date: 2013-06-12
SHANGHAI LIANJING MATERIAL ASSETAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is to solve the defect that crystal points can be produced in the process of preparing TPU in the prior art, and provide a new TPU formula and a preparation process using a new combination of twin-screw extruders, a drying and aging process and a new addition sequence

Method used

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  • Preparation method of transparent film-grade thermoplastic polyurethane elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Premix: 0.5% antioxidant, and 0.15% hindered amine light stabilizer, and 0.25% benzotriazole UV absorber, and 0.5% montan wax and / or erucamide wax Lubricant and 0.01% environmentally friendly catalyst are added to 70% polybutylene adipate polyol (PBA, hydroxyl value 56±3mgKOH / g, acid value ≤0.5 mgKOH / g) with a molecular weight of 2000 Mix to obtain a polymer polyol mixed solution,

[0064] Mixing: the polymer polyol mixed solution and 22% diisocyanate are poured into a single-screw mixing device through a mass flow meter for mixing to obtain a preliminary reaction mixture,

[0065] Reaction: pour the preliminary reaction mixture with 4.5% 1,4-butanediol into a co-rotating twin-screw continuous reaction extruder for reaction, the reaction temperature is 150~250°C, the pressure is 4~8MPa, the screw The rotation speed is between 250-350rpm, the kneading frequency is between 7-15 times / s, the length-to-diameter ratio of the screw is 48, the length of the reaction section i...

Embodiment 2

[0069] Premix: 0.5% antioxidant, and 0.15% hindered amine light stabilizer, and 0.25% benzotriazole UV absorber, and 0.5% montan wax and / or erucamide wax Lubricants and 0.01% of environmentally friendly catalysts are added to 67% of polybutylene adipate polyols with a molecular weight of 2000 (PBA, hydroxyl value 56±3mgKOH / g, acid value≤0.5 mgKOH / g) Mix to obtain a polymer polyol mixed solution,

[0070] Mixing: pouring the polymer polyol mixed solution and 24% diisocyanate into a single-screw mixing device through a mass flow meter for mixing to obtain a preliminary reaction mixture,

[0071] Reaction: pour the preliminary reaction mixture with 5.5% 1,4-butanediol into a co-rotating twin-screw continuous reaction extruder for reaction, the reaction temperature is 150~250°C, the pressure is 4~8MPa, the screw The rotation speed is between 250-350rpm, the kneading frequency is between 7-15 times / s, the length-to-diameter ratio of the screw is 48, the length of the reaction sect...

Embodiment 3

[0075] Premix: 0.5% antioxidant, and 0.15% hindered amine light stabilizer, and 0.25% benzotriazole UV absorber, and 0.4% montan wax and / or erucamide wax Lubricants, and 0.01% of environmentally friendly catalysts are added to 68% of polyethylene adipate polybutylene adipate polyol (PEBA, hydroxyl value 37±2mgKOH / g, acid value ≤0.5 mgKOH / g) mixing to obtain a polymer polyol mixed solution,

[0076] Mixing: pouring the polymer polyol mixed solution and 23% diisocyanate into a single-screw mixing device through a mass flow meter for mixing to obtain a preliminary reaction mixture,

[0077] Reaction: pour the preliminary reaction mixture and 5.8% 1,4-butanediol into a co-rotating twin-screw continuous reaction extruder for reaction, the reaction temperature is 150~250°C, the pressure is 4~8MPa, the screw The rotation speed is between 250-350rpm, the kneading frequency is between 7-15 times / s, the length-to-diameter ratio of the screw is 48, the length of the reaction section is...

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Abstract

The invention relates to the technical field of thermoplastic polyurethane elastomer (TPU), and specifically relates to a formula and a production technology of transparent film-grade TPU. According to the invention, 20-40% of diisocyanate, 45-75% of polymer polyhydric alcohol with a molecular weight of 1000-4000, 4-10% of 1,4-butylene glycol, 0.2-1% of an anti-oxidant, 0.2-1.5% of a lubricant, 0.001-0.02% of an environment-friendly catalyst, 0.2-1.0% of an ultraviolet ray absorbing agent, 0-0.8% of a hydrolysis-resisting agent, 0.1-1% of a light stabilizing agent, and 0-2% of other auxiliary agents are processed through steps such as premixing, reacting, dicing and dehydrating, and drying and curing, such that the transparent film-grade TPU is obtained. According to the invention, with the innovations on formula, equipment and technology, a defect of fisheye generation in TPU preparation processes in prior arts is solved. Factors such as a filling manner, an auxiliary agent adding manner, distributive mixing and dispersive mixing effects of an extruder, extruder retention time, and drying and curing are comprehensively considered, such that a stable product with high quality is produced.

Description

[technical field] [0001] The invention relates to the technical field of thermoplastic polyurethane elastomer (TPU), in particular to a formula and production process of transparent film grade thermoplastic polyurethane elastomer. [Background technique] [0002] The English name of thermoplastic polyurethane elastomer is Thermoplastic Polyurethane, or TPU for short. It is the three major types of polyurethane elastomers together with cast polyurethane elastomer (CPU) and mixing polyurethane elastomer (MPU). TPU is a kind of polyurethane elastomer that can be plasticized after heating and can be dissolved by solvent. Compared with cast polyurethane elastomer (CPU) and mixing polyurethane elastomer (MPU), TPU has no or little chemical structure. Chemically crosslinked, the molecular chains are essentially linear, but there is a certain amount of physical crosslinking. [0003] The earliest company to study TPU was Bayer in Germany. However, the products that were formally com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L75/04C08L75/06C08L75/08C08K5/134C08K5/526C08K5/3475C08K5/3435C08K5/20C08G18/66C08G18/42C08G18/48B29C47/92B29C71/00B29C71/02B29C48/92
CPCB29C48/92
Inventor 范年春蔡建国龙双林许海亮吴超学
Owner SHANGHAI LIANJING MATERIAL ASSETAB
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