A kind of preparation method of film grade TPU slice
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A film-level, slicing technology, applied in the field of thermoplastic polyurethane elastomer slicing, to achieve the effect of high hardness, high molecular crystallinity and high strength
Active Publication Date: 2017-12-29
上海承锡恩生物化工技术有限公司
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Abstract
Description
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Problems solved by technology
But after all, from a microscopic point of view, polyether and polyester are not really combined, and the performance of this TPU chip has not been fundamentally changed.
Method used
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Embodiment 1
[0025] A kind of preparation method of thin-film grade TPU chip, its preparation method is as follows:
[0026] (1) Copolymerize tetrahydrofuran and ε-caprolactone in a phosphotungstic acid catalyst system, 1,4-butanediol and water as initiators to obtain ester-ether copolymerized glycol, and the water content of ester-ether copolymerized glycol is 0.005%, the number average molecular weight is 1800;
[0027] (2) Mix the ester ether copolymerized glycol with a feed rate of 100kg / hr and diphenylmethane diisocyanate with a feed rate of 25kg / hr in a homogenizer, and then enter the prepolymerization reactor Obtain prepolymer; Wherein, the molar ratio of isocyanate and diol in diphenylmethane diisocyanate is 1.8:1, and the reaction temperature of prepolymerization reactor is 82 ℃, and reaction time is 110min;
[0028] (3) The prepolymer enters the prepolymer cooler, cools to 10°C, enters the homogenizer and mixes with 2-methyl-pentamethylenediamine and 1,4 butanediol to obtain the...
Embodiment 2
[0033] A kind of preparation method of thin-film grade TPU chip, its preparation method is as follows:
[0034] (1) Copolymerize tetrahydrofuran and ε-caprolactone in a phosphotungstic acid catalyst system, 1,4-butanediol and water as initiators to obtain ester-ether copolymerized glycol, and the water content of ester-ether copolymerized glycol is 0.005%, the number average molecular weight is 1800;
[0035] (2) Mix the ester ether copolymerized glycol with the feed rate of 100kg / hr and the diphenylmethane diisocyanate with the feed rate of 25kg / hr in the homogenizer, and then enter the prepolymerization reactor to obtain Prepolymer; Wherein, the mol ratio of isocyanate and diol in diphenylmethane diisocyanate is 1.8:1, and the reaction temperature of prepolymerization reactor is 85 ℃, and the reaction time is 120min;
[0036] (3) The prepolymer enters the prepolymer cooler, cools to 10°C, enters the homogenizer and mixes with 2-methyl-pentamethylenediamine and 1,4 butanedio...
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PUM
Property
Measurement
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Shore hardness
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Abstract
The invention relates to a preparation method of a film-grade TPU slice. The preparation method of the film-grade TPU slice comprises the following steps: (1) mixing tetrahydrofuran and epsilon-caprolactone ester ether copolyglycol with methylene diphenyl diisocyanate in a homogenizer, then entering mixture into a prepolymerization reactor to obtain prepolymer; (2) entering the prepolymer into a prepolymer cooler, cooling to 5-10 DEG C, entering the cooled prepolymer into a homogenizing machine to be mixed with 2-methyl-pentamethylene diamine and 1,4-butanediol to obtain a primary material; (3) entering the obtained primary material into a polymerization reactor to obtain a secondary material; (4) entering the secondary material into an ageing tank to be subjected to ageing, so that a final material is obtained; and (5) recycling a slice, entering the slice into a slice drying machine to be dried, so that the film-grade TPU slice is obtained. The film-grade TPU slice obtained by utilizing the preparation method provided by the invention has the advantages that shore hardness is 80-90A, breaking elongation is 650-700%, breaking strength is 70-75MPa and properties are excellent.
Description
technical field [0001] The invention relates to a method for preparing thermoplastic polyurethane elastomer chips by melting and extruding tetrahydrofuran and ε-caprolactone ester ether copolymerized diol, diphenylmethane diisocyanate, pentamethylenediamine and 1,4-butanediol reactants According to the method, the chip is suitable for preparing TPU films and fibers used in the clothing industry. Background technique [0002] In recent years, thermoplastic polyurethane (TPU) has been more and more used in the clothing industry, especially the film made of TPU with excellent moisture permeability is attached to the fabric, which can provide better protection, comfort and aesthetics. . The film made of TPU not only has wear resistance, good flexibility and high elasticity, but also has excellent moisture permeability and waterproof performance; the fabric compounded with this film can not only resist the invasion of rainwater and cold wind, but also protect the human body; Th...
Claims
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Application Information
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