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Synthesis and modification method of thermoplastic polyurethanes for melt-spinning spandex

A thermoplastic polyurethane and spandex technology, applied in the field of melt-spun spandex, can solve the problems of slow rebound, large investment, and small rebound stress of melt-spun spandex

Inactive Publication Date: 2008-06-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Since melt-spun spandex uses slices as raw materials, its production process is very similar to that of polyethylene terephthalate (PET) fibers, so you can refer to PET fiber production equipment, and its equipment investment is 30-50 million yuan per thousand tons , and dry spinning due to the complexity of equipment such as solvent recovery and purification systems, the investment is relatively large, and the investment per thousand tons of equipment is generally 200 to 400 million yuan
[0012] 5) Solvents cause environmental pollution
Moreover, melt-spun spandex has less rebound stress and slower rebound

Method used

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  • Synthesis and modification method of thermoplastic polyurethanes for melt-spinning spandex
  • Synthesis and modification method of thermoplastic polyurethanes for melt-spinning spandex
  • Synthesis and modification method of thermoplastic polyurethanes for melt-spinning spandex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 100 g of polyethylene glycol (PEA-2030) with a relative molecular mass of 2030 and 2.1 g of hydroxyl-terminated silicone (8% by weight of hydroxyl group) were placed in a three-necked flask, wherein the molar ratio of PEA to hydroxyl silicone was 10:90, the above mixture was heated to 100°C, and vacuum dehydrated for more than 2 hours to remove the moisture in the raw material. Put 34.1g of 4,4'-diphenylmethane diisocyanate (MDI) in a three-necked flask reactor, heat it to 85°C to melt it completely, and then start stirring, and add dehydrated hydroxyorganosilicon and PEA-2030, react at 85°C for 1.5h to make a prepolymer. 2.2g of 4,4'-diaminodiphenyl sulfone was dissolved in 8.0g of 1,4-butanediol (the molar fraction of aromatic diamine in the chain extender was about 10%), and then the Add the mixed chain extender to the above prepolymer, and stir quickly to make the mixed chain extender and prepolymer mix evenly. When the viscosity of the mixture increases, quickly p...

Embodiment 2

[0046] According to the method described in Example 1, the molar ratio of hydroxy silicone to PEA was 10:90, and the molar fractions of 4,4'-diaminodiphenylsulfone in the chain extender were 5%, 15%, and 20%, respectively. 25% thermoplastic polyurethane.

Embodiment 3

[0048] The thermoplastic polyurethane obtained in Examples 1 and 2 was used to measure the hardness of the synthesized TPU sample bar with a rubber durometer produced by Qianzhou Measuring Instrument Factory in Wuxi County, Jiangsu Province, and at least 3 points were measured on each sample, and the average value was calculated. Figure 2 shows the influence of different mole fractions of 4,4'-diaminodiphenylsulfone in the mixed chain extender on the hardness of TPU.

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Abstract

The invention relates to a synthesis and moidification method for thermaoplastic polyurethane for melt-spinning spandex, which comprises the steps of: (1) dehydration of the macromolecular diol; (2) preparation of prepolymers; (3) preparation of thermaoplastic polyurethane TPU; (4) aging. By introducing a proper proportion of a soft segment containing silicon-oxygen bonds and a hard segment containing a urea structure and rigid chains into theTPU, the invention greatly improves the performances of the melt-spinning spandex fiber.

Description

technical field [0001] The invention belongs to the field of melt-spinning spandex, in particular to a method for synthesizing and modifying thermoplastic polyurethane (TPU) for melt-spinning spandex. Background technique [0002] Melt-spun spandex is one of the research hotspots in the field of materials in the world at present. There are hundreds of related patents, mainly focusing on slice polymerization, additive preparation, equipment, oil agent, improvement of fiber heat resistance, resilience, elongation, etc. On the other hand, they are just some achievements in research. [0003] Judging from the current performance of melt-spun spandex, the performance of the product has been technically equivalent to that of dry-spun spandex fiber, and has the following characteristics: [0004] 1) Low modulus [0005] In the low deformation area, the melt-spun spandex has less tension, that is, the modulus is lower. This performance is finally reflected in the clothing, that i...

Claims

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Application Information

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IPC IPC(8): C08G18/28C08G18/10D01F6/70
Inventor 余木火韩克清胡定一刘结
Owner DONGHUA UNIV