CN108264626A - A kind of high resilience spandex slice - Google Patents
A kind of high resilience spandex slice Download PDFInfo
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- CN108264626A CN108264626A CN201810051419.8A CN201810051419A CN108264626A CN 108264626 A CN108264626 A CN 108264626A CN 201810051419 A CN201810051419 A CN 201810051419A CN 108264626 A CN108264626 A CN 108264626A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6603—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6607—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3212—Polyhydroxy compounds containing cycloaliphatic groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4236—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups
- C08G18/4238—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups derived from dicarboxylic acids and dialcohols
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4833—Polyethers containing oxyethylene units
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/88—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds
- D01F6/94—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polycondensation products as major constituent with other polymers or low-molecular-weight compounds of other polycondensation products
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- Chemical & Material Sciences (AREA)
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- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Artificial Filaments (AREA)
Abstract
The present invention proposes a kind of high resilience spandex slice, mainly includes：2,000 3000 repetitive unit of molecular weight contains 20 60 parts of the unbranched polyester diol of aliphatic linear of 11 or more carbon atoms；15 45 parts of the polyether polyol of molecular weight 1,000 2000；20 40 parts of diisocyanate；5 15 parts of chain extender, the chain extender are the dihydric alcohol of molecular weight 80 400；O.1 1.0 parts of antioxidant, the antioxidant are at least two in Hinered phenols, hindered amines, thio esters, phosphite ester kind antioxidant；0.1 1.0 parts of lubricant, lubricant are at least two in stearates, stearic amide class, illiteracy courage wax class, stearic acid esters, oleamide class, cyclic butylene terephthalate series lubricant agent；Further include the organic tin catalyst for accounting for other raw material gross weights 0.01 0.1%.For the present invention by controlling the molecular weight of polyester polyol, type and the type of chain extender, adjusting the aggregated structure of spandex section allows its resilience to reach more than 40%, instead of the spandex thread of dry-spinning, for requiring resilience higher special dimension.
Description
Technical field
The present invention relates to thermoplastic polyurethane material's technical fields more particularly to a kind of high resilience spandex to be sliced.
Background technology
Polyurethane elastomeric fiber, abbreviation PU fibers, the entitled Spandex in the U.S. (Spandex), West Europe are then known as ammonia
Synthetic fibre, the entitled spandex of Chinese commodity.It is elastic good that spandex has, and fiber number is thin, and strength is high, and ductility is high, and light specific gravity is soft, resistance to
The characteristics such as photosensitiveness is good and dyefastness is more excellent, and have more while its physical mechanical property and genuine milk collodion silk are sufficiently close to
Good chemically-resistant degradability, is known as " Second Skin ".
Spandex is not used alone generally, but marginally mixes in fabric.The use of spandex can improve the bullet of textile
Property and pliability, assign the good elasticity of zephyr, can also give the planarization of bottom weight, make to take fabric takes effect
Fruit is more preferably comfortable, improves the class of textile, is known as the title of " textile industry monosodium glutamate ".Therefore it is used to make high-grade elasticity extensively
Braided fabric.
At present, dry spinning is most widely used spandex fiber method in the world.The technique represents enterprise as the country
Magnificent peak spandex, Dupont (Lycra), Bayer Bitterfeld GmbH (Dorlastan) and South Korea's Hyosung etc..Dry spinning produces spandex
When, a large amount of organic solvent dimethylformamide or dimethylacetylamide can be used, is not only polluted the environment, it can also be residual
It stays in fiber, the liver of people is damaged, nowadays European Union has been forbidden to use dry method spandex manufacture underwear.
Melt spinning method rises in recent years, is a kind of production work that fibre forming is carried out using the fluid that high polymer melts
Skill, has that technological process is simple, and equipment investment is low, and production efficiency is high, and production cost is low, and production process is without solvent, in product
The advantages that without toxic solvent, and fine-denier is easily achieved, it is a kind of the most economical, environment amenable spandex produces skill
Art will at home and abroad have vast market prospect.
Fibre-grade TPU, that is, spandex section requires elasticity and modulus is reasonable, high temperature resistant, hydrolysis, and antiacid alkali is anti-ageing
Change, anti-chlorine, molecular mass and its features such as be reasonably distributed, it also has good aggregated structure, hydrogen bond and microfacies point in addition
From) and good spinning properties, the above performance apparent shadow can be generated to melt spun spandex silk and compound yarn quality
It rings.And at present melt spun spandex in elastic recovery rate, heat resistance etc. not as good as dry spinning spandex.When the resilience of spandex thread is insufficient
When, then it needs clothes to be made to reach high resiliency using a greater amount of spandex threads, this not only lowers the quality of prepared clothes,
Undoubtedly increase cost.
Invention content
To solve the shortcomings of the prior art, the present invention provides a kind of high resilience spandex slices, are cut using this spandex
The filament of piece melt-spinning has the high resilience of analogy dry spinning spandex silk, reduces prepared clothes under equal aeroelastic requirements
The dosage of spandex thread, the aesthetics of clothes prepared by raising and sense comfortable and easy to wear, have very high economic value.
Molecular weight 2000-3000 repetitive units contain the unbranched polyester diol of aliphatic linear of 11 or more carbon atoms
20-60 parts；
15-45 parts of the polyether polyol of molecular weight 1000-2000；
20-40 parts of diisocyanate；5-15 parts of chain extender, the chain extender are the dihydric alcohol of molecular weight 80-400；
0.1-1.0 parts of antioxidant, the antioxidant be Hinered phenols, hindered amines, thio esters, phosphorous acid esters antioxygen
At least two in agent；
0.1-1.0 parts of lubricant, the lubricant are stearates, and stearic amide class covers courage wax class, stearate
Class, oleamide class, at least two in cyclic butylene terephthalate series lubricant agent；
The catalyst for accounting for other raw material gross weight 0.01-0.1% is further included, the catalyst is in organic tin catalyst
It is a kind of.
Spandex section is one kind of thermoplastic polyurethane.Thermoplastic polyurethane is usually by macromolecular polyol, isocyanic acid
Ester and small molecule chain extender reaction are prepared.Macromolecular polyol glass transition temperature is low, is soft chain segment, at room temperature into flexibility
Into rubbery state；Isocyanates and the segment that small molecule chain extender is formed are into rigidity, and glass transition temperature is high, easily crystallizes, for hard section, room
Into glassy state or crystalline state under temperature；Soft segment and hard section are thermodynamically incompatible, flock together respectively, cause thermoplastic poly ammonia
Microphase-separated state in ester state of aggregation.When exposed to external forces, soft segment Molecular connectivity indices change, and hard section remains unchanged,
After removing external force, soft segment conformation be returned to before Stable conformation, therefore show high resiliency.
As the restriction to above-mentioned technical proposal, the aliphatic linear that the repetitive unit contains 11 or more carbon atoms gathers
Ester dihydric alcohol is a kind of binary of fatty acids containing 6 to 10 carbon atoms and a kind of binary aliphatic alcohol containing 4-10 carbon atom
What reaction was prepared.
As the restriction to above-mentioned technical proposal, the binary of fatty acids includes 1,6- adipic acids, 1,7- pimelic acid, 1,
8 suberic acids, 1,9- azelaic acids, 1,10- decanedioic acid, the binary aliphatic alcohol include 1,4-butanediol, 1,6- hexylene glycols, 1,7-
Heptandiol, 1,8- ethohexadiols, 1,9 nonanediols, 1,10 decanediols.
As the restriction to above-mentioned technical proposal, the degree of functionality of the polyether polyol is poly- four between 2.0-2.4
One kind in hydrogen furan polyols, PolyTHF ethylene oxide copolymerization ethoxylated polyhydric alcohol.
As the restriction to above-mentioned technical proposal, the diisocyanate is 4,4 '-methyl diphenylene diisocyanate
(MDI), one kind in paraphenylene diisocyanate (PPDI).
As the restriction to above-mentioned technical proposal, the chain extender is 1,4-butanediol, 1,4-CHDM, to benzene
One kind in diphenol dihydroxyethyl ether.
As the restriction to above-mentioned technical proposal, the antioxidant is four (β-(3,5- di-tert-butyl-hydroxy phenyl) third
Acid) pentaerythritol ester (antioxidant 1010), 3- (3,5- di-tert-butyl-hydroxy phenyl) propionic acid n-octadecane alcohol ester (antioxidant
1076), 2,6- is to di-tert-butyl p-cresol (antioxidant 264), two (dodecyl) -3,3 '-thio double propionate (antioxidant
DLTP), three (2,4- di-t-butyl) phenyl-phosphites (irgasfos 168), bis- (2,4- di-tert-butyl-phenyl) pentaerythrites two are sub-
At least two in phosphate (antioxidant THP-24), three isodecyl fat of phosphorous acid.
As the restriction to above-mentioned technical proposal, the lubricant is zinc stearate, calcium stearate, four hard acid of pentaerythrite
At least two in ester, ethylene bis stearic acid amide, illiteracy courage wax E waxes, oleamide, CBT100, CBT200.
As the restriction to above-mentioned technical proposal, the catalyst is one in stannous octoate, tin dilaurate dioctyl tin
Kind.
As the restriction to said program, also may include in hindered amines, benzophenone, the steady agent of azimidobenzene class light
One or more, such as bis- (2,2,6,6- tetramethyl -4- piperidyls) sebacates (HA-10), poly-succinic (4- ethoxys -
2,2,6,6- tetramethyl -1- piperidine ethanols) ester (BW-10LD), [[3,5- di-tert-butyl-hydroxy phenyl] methyl] butyl the third two
Sour two (1,2,2,6,6- pentamethyl -4- piperidyls) esters (UV-144), 2- hydroxyls -4 '-methoxy benzophenone (UV-9), 2- hydroxyls
Base -4- oxy-octyl benzophenones (UV-531), 2- (2H- benzotriazole -2- bases) -4,6- bis- (1- methyl-1s-phenethyl)-benzene
Phenol (UV234).
As the restriction to said program, it also may include such as antistatic agent, colorant, anti-hydrolysis agent, delustering agent, fire-retardant
Other auxiliary agents such as agent, antiseptic, processing aid.
As the restriction to above-mentioned technical proposal, known twin-screw reactive extrursion method can be used to prepare the ammonia of the present invention
Synthetic fibre is sliced.
In conclusion by controlling the molecular weight of polyester polyol, type and the type of chain extender, adjust spandex and cut
The aggregated structure of piece controls its resilience；High stability lubricant is matched to improve the processability of spandex section；Again
With high activity antioxidant systems, to improve the durability of spandex section and chlorine resistance.Under the comprehensive function of each raw material, make
The resilience of spandex thread that the spandex section prepared with this formula is weaved can reach more than 40%, and then replace the spandex of dry-spinning
Silk, for requiring resilience higher special dimension.
Specific embodiment
Below in conjunction with embodiment, technical scheme of the present invention is clearly and completely described, it is clear that described
Embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field
Those of ordinary skill's all other embodiments obtained without making creative work, belong to protection of the present invention
Range.
A kind of high resilience spandex slice composition of raw materials composition of the present embodiment：
Molecular weight 2000-3000 repetitive units contain the aliphatic linear polyester diol 20-60 of 11 or more carbon atoms
Part；
15-45 parts of the polyether polyol of molecular weight 1000-2000；
20-40 parts of diisocyanate；5-15 parts of chain extender, the chain extender are the dihydric alcohol of molecular weight 80-400；
0.1-1.0 parts of antioxidant, the antioxidant be Hinered phenols, hindered amines, thio esters, phosphorous acid esters antioxygen
At least two in agent；
0.1-1.0 parts of lubricant, the lubricant are stearates, and stearic amide class covers courage wax class, stearate
Class, oleamide class, at least two in cyclic butylene terephthalate series lubricant agent；
The catalyst for accounting for other raw material gross weight 0.01-0.1% is further included, the catalyst is in organic tin catalyst
It is a kind of.
Each raw material is matched by table 1, injection draw ratio is in 60 double screw extruder, and raw material is made to be reacted at 250 DEG C
Spandex section is made.
The present embodiment is related to the performance verification of the thermoplastic polyurethane material of the present invention.
The measure of the elastic recovery rate of monofilament：
By sample that length is 50mm using tensile testing machine along its length to be stretched under the rate of 500%/min
To 300%, then it under phase same rate is relaxed at once, takes in drawing process 150% traction stresses σ 1 and relaxation
In 150% traction stresses σ 2, and calculated with following formula：
Elastic recovery (%)=(2/ σ 1 of σ) * 100
The measure of the thermal finalization rate of monofilament：
By the sample that initial length L1 is 20mm, it is stretched to and is put at once after 100% in the baking oven that temperature is 125 ± 2 DEG C,
Constant temperature 10min, then takes out at once, releases tensile stress, is placed in the thermostatic chamber that temperature is 23 ± 2 DEG C after cooling 8h, surveys
The length L2 of random sample product.
Thermal finalization (%)={ (L2-L1)/L1 } * 100
Other performances are tested by national standard；
Testing result is as shown in table 2.
Table 1
Table 2
The spandex thread prepared using the spandex section of the present invention, the opposite spandex thread prepared with conventional spandex section are had more
Good elastic recovery and the elastic recovery of dry spinning spandex silk are suitable.
In conclusion the spandex section of the present invention has higher elasticity compared to spandex thread prepared by conventional spandex section
It replys, spandex thread prepared by dry-spinning can be replaced to be used to require elastic recovery in high dress material field, and more safety and environmental protection.
Claims (9)
1. a kind of high resilience spandex slice, it is characterised in that including following raw material component：
Molecular weight 2000-3000 repetitive units contain the unbranched polyester diol 20- of aliphatic linear of 11 or more carbon atoms
60 parts；
15-45 parts of the polyether polyol of molecular weight 1000-2000；
20-40 parts of diisocyanate；5-15 parts of chain extender, the chain extender are the dihydric alcohol of molecular weight 80-400；
0.1-1.0 parts of antioxidant, the antioxidant is Hinered phenols, in hindered amines, thio esters, phosphite ester kind antioxidant
At least two；
0.1-1.0 parts of lubricant, the lubricant is stearates, stearic amide class, cover courage wax class, stearic acid esters,
At least two in oleamide class, cyclic butylene terephthalate series lubricant agent；
The catalyst for accounting for other raw material gross weight 0.01-0.1% is further included, the catalyst is one in organic tin catalyst
Kind.
2. a kind of high resilience spandex slice according to claim 1, it is characterised in that：The repetitive unit contain 11 with
The aliphatic linear polyester diol of upper carbon atom contains 4- for a kind of binary of fatty acids containing 6 to 10 carbon atoms and one kind
What the binary aliphatic alcohol reaction of 10 carbon atoms was prepared.
3. a kind of high resilience spandex slice according to claim 1, it is characterised in that：The binary of fatty acids includes 1,
6- adipic acids, 1,7- pimelic acid, 1,8 suberic acids, 1,9- azelaic acids, 1,10- decanedioic acid, the binary aliphatic alcohol include Isosorbide-5-Nitrae-
Butanediol, 1,6- hexylene glycols, 1,7- heptandiols, 1,8- ethohexadiols, 1,9 nonanediols or 1,10 decanediols.
4. a kind of high resilience spandex slice according to claim 1, it is characterised in that：The function of the polyether polyol
It spends between 2.0-2.4, is one kind in polytetrahydrofuran polyol, PolyTHF ethylene oxide copolymerization ethoxylated polyhydric alcohol.
5. a kind of high resilience spandex slice according to claim 1, it is characterised in that：The diisocyanate for 4,4 '-
One kind in methyl diphenylene diisocyanate, paraphenylene diisocyanate.
6. a kind of high resilience spandex slice according to claim 1, it is characterised in that：The chain extender is Isosorbide-5-Nitrae-fourth two
One kind in alcohol, 1,4-CHDM, hydroquinone two hydroxy ethyl ether.
7. a kind of high resilience spandex slice according to claim 1, it is characterised in that：The antioxidant is four (β-(3,5-
Di-tert-butyl-hydroxy phenyl) propionic acid) pentaerythritol ester (antioxidant 1010), 3- (3,5- di-tert-butyl-hydroxy phenyl) third
Sour n-octadecane alcohol ester (antioxidant 1076), 2,6- to di-tert-butyl p-cresol (antioxidant 264), two (dodecyl) -3,3 ' -
Thio double propionate (anti-oxidant DLTP), three (2,4- di-t-butyl) phenyl-phosphites (irgasfos 168), bis- (2,4- bis- tertiary fourths
Base phenyl) pentaerythritol diphosphites (antioxidant THP-24), at least two in three isodecyl fat of phosphorous acid.
8. a kind of high resilience spandex slice according to claim 1, it is characterised in that：The lubricant for zinc stearate,
Calcium stearate, ethylene bis stearic acid amide, is covered in courage wax E waxes, oleamide, CBT100, CBT200 pentaerythrite four hard acid ester
At least two.
9. a kind of high resilience spandex slice according to claim 1, it is characterised in that：The catalyst for stannous octoate,
One kind in tin dilaurate dioctyl tin.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109593026A (en) * | 2018-12-13 | 2019-04-09 | 东莞理工学院 | A kind of phenol color inhibition composition and its application |
| CN109705302A (en) * | 2018-12-29 | 2019-05-03 | 河北邦泰氨纶科技有限公司 | Highlighted bubble pearl thermoplastic polyurethane of a kind of high rebound of production and preparation method thereof |
| CN110923946A (en) * | 2019-11-20 | 2020-03-27 | 苏州市雄林新材料科技有限公司 | Nano antibacterial breathable TPU (thermoplastic polyurethane) film and preparation method thereof |
| CN114790275A (en) * | 2022-05-16 | 2022-07-26 | 金俊平 | High-temperature-resistant melt-spun spandex slice with excellent mechanical properties and preparation method thereof |
| CN115197391A (en) * | 2022-08-15 | 2022-10-18 | 河北邦泰氨纶科技有限公司 | Fiber-grade polyurethane slice and preparation method and application thereof |
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