CN105669929A - Engineering thermoplastic polyurethane elastomer and preparation method thereof - Google Patents

Engineering thermoplastic polyurethane elastomer and preparation method thereof Download PDF

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Publication number
CN105669929A
CN105669929A CN201610160506.8A CN201610160506A CN105669929A CN 105669929 A CN105669929 A CN 105669929A CN 201610160506 A CN201610160506 A CN 201610160506A CN 105669929 A CN105669929 A CN 105669929A
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China
Prior art keywords
diisocyanate
engineering grade
thermoplastic elastomer
dihydroxylic alcohols
little molecule
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Pending
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CN201610160506.8A
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Chinese (zh)
Inventor
战振生
张生
刘建文
王仁鸿
宋红玮
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Miracll New Material Co Ltd
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Miracll New Material Co Ltd
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Priority to CN201610160506.8A priority Critical patent/CN105669929A/en
Publication of CN105669929A publication Critical patent/CN105669929A/en
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    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30Low-molecular-weight compounds
    • C08G18/32Polyhydroxy compounds; Polyamines; Hydroxyamines
    • C08G18/3203Polyhydroxy compounds
    • C08G18/3206Polyhydroxy compounds aliphatic
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00Making granules
    • B29B9/02Making granules by dividing preformed material
    • B29B9/06Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/92Measuring, controlling or regulating
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08GMACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00Polymeric products of isocyanates or isothiocyanates
    • C08G18/06Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30Low-molecular-weight compounds
    • C08G18/32Polyhydroxy compounds; Polyamines; Hydroxyamines
    • C08G18/3203Polyhydroxy compounds
    • C08G18/3212Polyhydroxy compounds containing cycloaliphatic groups
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00Indexing scheme relating to extrusion moulding
    • B29C2948/92Measuring, controlling or regulating
    • B29C2948/92504Controlled parameter
    • B29C2948/92704Temperature

Abstract

The invention relates to an engineering thermoplastic polyurethane elastomer and a preparation method thereof. The engineering thermoplastic polyurethane elastomer is prepared from, by weight, 20-40 parts of micromolecular dihydric alcohol, 60-80 parts of diisocyanate, 0.1-2 parts of an antioxidant, 0.1-2 parts of a light stabilizer and 0.1-2 parts of a lubricating agent. The preparation method includes: adding the antioxidant, the light stabilizer and the lubricating agent into the micromolecular dihydric alcohol, and well stirring; measuring the micromolecular dihydric alcohol and diisocyanate, and then adding into a double-screw extruder; adopting a one-step double-screw reactive extrusion process, performing brace pelletizing or underwater pelletizing after discharging from a die head, and drying in a dehumidifying and drying hopper to obtain engineering thermoplastic polyurethane particles. Thermoplastic polyurethane elastomers prepared according to the method have the advantages of high hardness, high light transmittance, high bending strength, high toughness and high heat resistance.

Description

A kind of engineering grade Polyurethane Thermoplastic Elastomer and preparation method thereof
Technical field
The present invention relates to the preparation field of polyurethane elastomer, particularly relate to a kind of engineering grade Polyurethane Thermoplastic Elastomer and preparation method thereof.
Background technology
Polyurethane Thermoplastic Elastomer (TPU) is that a class heating can plastify, and chemical constitution does not have or seldom has the polyurethane of chemical crosslinking, have high intensity, high-modulus, excellent wearability and good oil resistivity in broad hardness range. But the hardness range of conventional TPU is typically in 60ShoreA-65ShoreD. When adopting traditional formula system and process to prepare, when the hardness of Polyurethane Thermoplastic Elastomer (TPU) is further continued for improving, it often shows black brittleness, it is impossible to meet normal user demand. Therefore, the engineering grade Polyurethane Thermoplastic Elastomer of the good high rigidity of a kind of toughness is provided, high bending strength, high transparency, high-fire resistance energy, good processability particularly can be provided and toughness is better, the simple engineering grade Polyurethane Thermoplastic Elastomer of production technology and preparation method thereof, become the target that industry is badly in need of solving.
Summary of the invention
The invention aims to provide a kind of engineering grade Polyurethane Thermoplastic Elastomer and preparation method thereof so that it is existing higher hardness, there is again good toughness and thermostability, and production method is simple, it is simple to automated production.
For solving the problems referred to above, the present invention provides a kind of engineering grade Polyurethane Thermoplastic Elastomer, including little molecule dihydroxylic alcohols 20-40 part; Diisocyanate 60-80 part; Antioxidant 0.1-2 part; Light stabilizer 0.1-2 part, lubricant 0.1-2 part, the above refers both to parts by weight.
Further, described little molecule dihydroxylic alcohols is 22-38 part; Diisocyanate is 68-78 part; Antioxidant is 0.2-2 part; Light stabilizer is 0.5-2 part, and lubricant is 0.3-2 part.
Further, described little molecule dihydroxylic alcohols be ethylene glycol, 1,3-PD, 1,3-butanediol, 1, one or more in 4-butanediol, 1,6-hexanediol, 1,4-CHDM, diethylene glycol, triethylene glycol, neopentyl glycol, dipropylene glycol.
Further, described little molecule dihydroxylic alcohols is one or more in BDO, 1,6-hexanediol, 1,4-CHDM, triethylene glycol.
Further, described diisocyanate is one or more in toluene di-isocyanate(TDI), methyl diphenylene diisocyanate, dicyclohexyl methyl hydride diisocyanate, hexamethylene diisocyanate.
Further, described antioxidant is BASF WithIn one or more.
Further, described light stabilizer is BASF WithIn one or more.
Further, described lubricant is one or more in E wax, PE wax, OP wax, S wax, oleamide, erucyl amide and stearic amide.
The present invention also provides for this engineering thermoplastic polyurethane method for producing elastomers, the steps include: first antioxidant, light stabilizer and lubricant to be joined in little molecule dihydroxylic alcohols, it is sufficiently stirred for, then join in double screw extruder after little molecule dihydroxylic alcohols and diisocyanate being measured, adopt one-step method twin-screw reactive expressing technique, be placed in dehumidifying, drying hopper dry obtain engineering grade thermoplastic polyurethane particle through stretching and granulation or underwater cutpellet after going out die head; Wherein, the temperature of double screw extruder is set as 120-250 DEG C, and pelletize water temperature controls at 60-90 DEG C, and baking temperature controls at 40-80 DEG C, and drying time controls at 30min-2h.
The hardness of the engineering grade Polyurethane Thermoplastic Elastomer that the present invention prepares is 81ShoreD-85ShoreD, light transmittance is 80%-95%, bending strength is 100MPa-150MPa, and Izod notched impact strength (-40 DEG C) is 50J/m-100J/m, and Vicat softening point is 85-145 DEG C.
Adopting the hardness of Polyurethane Thermoplastic Elastomer prepared by the present invention high, light transmittance is good, and bending strength is high, good toughness and have good thermostability, is applicable to multiple polyurethane products, substantially increases the range of application of Polyurethane Thermoplastic Elastomer. Engineering grade Polyurethane Thermoplastic Elastomer prepared by preparation method of the present invention is adopted to can be used for preparing phone housing, automobile lubricating cup, guide roller and optics etc., it is possible to prepare various product by traditional machining processes such as injection moulding, extrusion and calenderings.
Detailed description of the invention
Embodiment 1
The present invention provides a kind of engineering grade Polyurethane Thermoplastic Elastomer, prepared by one-step method twin screw extrusion process: first antioxidant, light stabilizer and lubricant are joined in little molecule dihydroxylic alcohols, it is sufficiently stirred for 2h at 110 DEG C, then being dosed in double screw extruder by little molecule dihydroxylic alcohols and diisocyanate, the polymer discharged from die head is cut into oval pellet by underwater cutpellet. Wherein said little molecule dihydroxylic alcohols is 1,6-hexanediol, and addition is 32 parts; Described diisocyanate is methyl diphenylene diisocyanate, and addition is 68 parts; Described antioxidant is BASFAddition is 0.3 part; Described light stabilizer is BASFAddition is 0.5 part; Described lubricant is E wax, and addition is 0.3 part. Engineering grade TPU finished product is injected performance test batten by injection machine after drying, after 100 DEG C of ripening 16h, is then cooled to room temperature tests its properties of product.
Embodiment 2
The present invention provides a kind of engineering grade Polyurethane Thermoplastic Elastomer, prepared by one-step method twin screw extrusion process: antioxidant, light stabilizer and lubricant are joined in little molecule dihydroxylic alcohols, it is sufficiently stirred for 2h at 110 DEG C, then being dosed in double screw extruder by little molecule dihydroxylic alcohols and diisocyanate, the polymer discharged from die head is cut into oval pellet by underwater cutpellet.Wherein said little molecule dihydroxylic alcohols is BDO and the mixture of 1,6-hexanediol, and addition is 14 parts; Described diisocyanate is methyl diphenylene diisocyanate, and addition is 72 parts; Described antioxidant is BASFWithAddition is 0.2 part; Described light stabilizer is BASFWithAddition respectively 1.5 parts and 0.5 part; Described lubricant is E wax and oleamide, addition respectively 0.7 part and 0.5 part. Engineering grade TPU finished product is injected performance test batten by injection machine after drying, after 100 DEG C of ripening 16h, is then cooled to room temperature tests its properties of product.
Embodiment 3
The present invention provides a kind of engineering grade Polyurethane Thermoplastic Elastomer, prepared by one-step method twin screw extrusion process: antioxidant, light stabilizer and lubricant are joined in little molecule dihydroxylic alcohols, it is sufficiently stirred for 2h at 110 DEG C, then being dosed in double screw extruder by little molecule dihydroxylic alcohols and diisocyanate, the polymer discharged from die head is cut into oval pellet by underwater cutpellet. Described little molecule dihydroxylic alcohols is 1,4-CHDM, and addition is 22 parts; Described diisocyanate is methyl diphenylene diisocyanate, and addition is 78 parts; Described antioxidant is BASFWithAddition respectively 1.6 parts and 0.4 part; Described light stabilizer is BASFWithAddition respectively 0.5 part and 0.4 part; Described lubricant is E wax and PE wax, addition respectively 0.3 part and 0.5 part. Engineering grade TPU finished product is injected performance test batten by injection machine after drying, after 100 DEG C of ripening 16h, is then cooled to room temperature tests its properties of product.
Embodiment 4
The present invention provides a kind of engineering grade Polyurethane Thermoplastic Elastomer, prepared by one-step method twin screw extrusion process: antioxidant, light stabilizer and lubricant are joined in little molecule dihydroxylic alcohols, it is sufficiently stirred for 2h at 110 DEG C, then being dosed in double screw extruder by little molecule dihydroxylic alcohols and diisocyanate, the polymer discharged from die head is cut into oval pellet by underwater cutpellet. Described little molecule dihydroxylic alcohols is 1,4-CHDM and the mixture of 1,6-hexanediol, addition respectively 22 parts and 6 parts; Described diisocyanate is dicyclohexyl methyl hydride diisocyanate, and addition is 72 parts; Described antioxidant is BASFWithAddition respectively 0.4 part and 0.6 part; Described light stabilizer is BASFWithAddition respectively 0.5 part and 0.8 part; Described lubricant is oleamide and PE wax, addition respectively 0.1 part and 0.5 part. Engineering grade TPU finished product is injected performance test batten by injection machine after drying, after 100 DEG C of ripening 16h, is then cooled to room temperature tests its properties of product.
Embodiment 5
The present invention provides a kind of engineering grade Polyurethane Thermoplastic Elastomer, prepared by one-step method twin screw extrusion process: antioxidant, light stabilizer and lubricant are joined in little molecule dihydroxylic alcohols, it is sufficiently stirred for 2h at 110 DEG C, then being dosed in double screw extruder by little molecule dihydroxylic alcohols and diisocyanate, the polymer discharged from die head is cut into oval pellet by underwater cutpellet. Described little molecule dihydroxylic alcohols is 1,4-CHDM and the mixture of 1,6-hexanediol, addition respectively 14 parts and 14 parts; Described diisocyanate is hexamethylene diisocyanate, and addition is 72 parts; Described antioxidant is BASFWithAddition respectively 0.4 part and 0.6 part;Described light stabilizer is BASFWithAddition respectively 0.3 part and 0.5 part; Described lubricant is E wax, oleamide and PE wax, addition respectively 0.5 part, 0.5 part and 1 part. Engineering grade TPU finished product is injected performance test batten by injection machine after drying, after 100 DEG C of ripening 16h, is then cooled to room temperature tests its properties of product.
Embodiment 6
The present invention provides a kind of engineering grade Polyurethane Thermoplastic Elastomer, prepared by one-step method twin screw extrusion process: antioxidant, light stabilizer and lubricant are joined in little molecule dihydroxylic alcohols, it is sufficiently stirred for 2h at 110 DEG C, then being dosed in double screw extruder by little molecule dihydroxylic alcohols and diisocyanate, the polymer discharged from die head is cut into oval pellet by underwater cutpellet. Described little molecule dihydroxylic alcohols is 1,6-hexanediol, and addition is 25 parts; Described diisocyanate is toluene di-isocyanate(TDI), and addition is 75 parts; Described antioxidant is BASFWithAddition respectively 1.2 parts, 0.3 part and 0.5 part; Described light stabilizer is BASFWithAddition respectively 0.3 part and 0.7 part; Described lubricant is E wax, erucyl amide and PE wax, addition respectively 0.3 part, 0.2 part and 1 part.
The number adopted in the application is weight portion.
The engineering grade TPU of specific embodiment 1~6 is carried out performance test, wherein:
Hardness is tested by ASTMD2240 standard;
Light transmittance is tested by ASTMD1003 standard
Bending strength is tested by ASTMD790 standard;
Izod notched impact strength (-40 DEG C) is tested by ASTMD256 standard;
Vicat softening point is tested by ASTMD1525 standard.
The main physicochemical property of table 1
Performance indications Hardness Light transmittance Bending strength Impact strength Vicat softening point
Unit Shore D % MPa J/m
Embodiment 1 82 80 150 50 85
Embodiment 2 81 81 115 57 121
Embodiment 3 85 95 100 100 145
Embodiment 4 84 86 112 93 131
Embodiment 5 83 90 105 78 109
Embodiment 6 85 81 113 66 102
The above; it it is only presently preferred embodiments of the present invention; not the present invention being done any pro forma restriction, those skilled in the art utilize the technology contents of the disclosure above to make a little simple modification, equivalent variations or modification, all fall within protection scope of the present invention.

Claims (9)

1. an engineering grade Polyurethane Thermoplastic Elastomer, it is characterised in that include little molecule dihydroxylic alcohols 20-40 part; Diisocyanate 60-80 part; Antioxidant 0.1-2 part; Light stabilizer 0.1-2 part, lubricant 0.1-2 part, the above refers both to parts by weight.
2. engineering grade Polyurethane Thermoplastic Elastomer according to claim 1, it is characterised in that described little molecule dihydroxylic alcohols is 22-38 part; Diisocyanate is 68-78 part; Antioxidant is 0.2-2 part; Light stabilizer is 0.5-2 part, and lubricant is 0.3-2 part.
3. engineering grade Polyurethane Thermoplastic Elastomer according to claim 1, it is characterized in that, described little molecule dihydroxylic alcohols be ethylene glycol, 1, ammediol, 1,3-butanediol, 1, one or more in 4-butanediol, 1,6-hexanediol, 1,4-CHDM, diethylene glycol, triethylene glycol, neopentyl glycol, dipropylene glycol.
4. engineering grade Polyurethane Thermoplastic Elastomer according to claim 3, it is characterised in that described little molecule dihydroxylic alcohols is one or more in BDO, 1,6-hexanediol, 1,4-CHDM, triethylene glycol.
5. engineering grade Polyurethane Thermoplastic Elastomer according to claim 1, it is characterized in that, described diisocyanate is one or more in toluene di-isocyanate(TDI), methyl diphenylene diisocyanate, dicyclohexyl methyl hydride diisocyanate, hexamethylene diisocyanate.
6. engineering grade Polyurethane Thermoplastic Elastomer according to claim 1, it is characterised in that described antioxidant is BASF1010、1076、1098、B900 andOne or more in 168.
7. engineering grade Polyurethane Thermoplastic Elastomer according to claim 1, it is characterised in that described light stabilizer is BASF326、328、770、81、944 HesOne or more in 2020.
8. engineering grade Polyurethane Thermoplastic Elastomer according to claim 1, it is characterised in that described lubricant is one or more in E wax, PE wax, OP wax, S wax, oleamide, erucyl amide and stearic amide.
9. the engineering grade method for preparing thermoplastic polyurethane elastomer described in a claim 1, it is characterized in that, the steps include: first antioxidant, light stabilizer and lubricant to be joined in little molecule dihydroxylic alcohols, it is sufficiently stirred for, then join in double screw extruder after little molecule dihydroxylic alcohols and diisocyanate being measured, adopt one-step method twin-screw reactive expressing technique, be placed in dehumidifying, drying hopper dry obtain engineering grade thermoplastic polyurethane particle through stretching and granulation or underwater cutpellet after going out die head; Wherein, the temperature of double screw extruder is set as 120-250 DEG C, and pelletize water temperature controls at 60-90 DEG C, and baking temperature controls at 40-80 DEG C, and drying time controls at 30min-2h.
CN201610160506.8A 2016-03-21 2016-03-21 Engineering thermoplastic polyurethane elastomer and preparation method thereof Pending CN105669929A (en)

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Cited By (13)

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CN106048774A (en) * 2016-06-27 2016-10-26 张勇 Production method of polyurethane elastic fibers
CN106220815A (en) * 2016-07-28 2016-12-14 东莞市雄林新材料科技股份有限公司 A kind of nano material dispersion technology for TPU
CN106854271A (en) * 2016-12-30 2017-06-16 山东诺威聚氨酯股份有限公司 Encapsulated special TPU materials and preparation method thereof
CN107880399A (en) * 2017-12-26 2018-04-06 肖彬 Automobile decoration piece polypropylene plastics and its production technology
CN108192554A (en) * 2017-12-28 2018-06-22 宁波凯耀电器制造有限公司 A kind of thermostable transparent glue and preparation method thereof
WO2018145333A1 (en) * 2017-02-10 2018-08-16 美瑞新材料股份有限公司 Thermoplastic organosilicone-polyurethane elastomer and preparation method therefor
CN108659196A (en) * 2018-03-27 2018-10-16 中科宏德(北京)科技发展有限公司 A kind of thermoplastic polyurethane elastomer and preparation method thereof
CN108912299A (en) * 2018-08-01 2018-11-30 浙江华峰热塑性聚氨酯有限公司 Roll grade high-temperature-resistant thermoplastic polyurethane elastomer and preparation method thereof
CN110218439A (en) * 2019-07-15 2019-09-10 美瑞新材料股份有限公司 A kind of tough high rigidity thermoplastic polyurethane elastomer and preparation method thereof
CN110804156A (en) * 2019-11-07 2020-02-18 中天科盛(上海)企业发展股份有限公司 High-strength anti-aging thermoplastic polyurethane elastomer and preparation method thereof
CN112519164A (en) * 2020-11-11 2021-03-19 江苏铁锚玻璃股份有限公司 Preparation method of special-shaped transparent part
CN112979904A (en) * 2021-02-23 2021-06-18 美瑞新材料股份有限公司 Low molecular weight polyurethane resin and application thereof in tackifying resin
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CN106048774A (en) * 2016-06-27 2016-10-26 张勇 Production method of polyurethane elastic fibers
CN106220815A (en) * 2016-07-28 2016-12-14 东莞市雄林新材料科技股份有限公司 A kind of nano material dispersion technology for TPU
CN106854271A (en) * 2016-12-30 2017-06-16 山东诺威聚氨酯股份有限公司 Encapsulated special TPU materials and preparation method thereof
US11530310B2 (en) 2017-01-16 2022-12-20 Miracll Chemicals Co., Ltd. Method for preparing foamed thermoplastic polyurethane elastomer product
KR102224198B1 (en) * 2017-02-10 2021-03-08 미라클 케미컬스 씨오., 엘티디. Thermoplastic silicone-polyurethane elastomer and manufacturing method thereof
WO2018145333A1 (en) * 2017-02-10 2018-08-16 美瑞新材料股份有限公司 Thermoplastic organosilicone-polyurethane elastomer and preparation method therefor
US11643498B2 (en) 2017-02-10 2023-05-09 Miracll Chemicals Co., Ltd. Thermoplastic silicone-polyurethane elastomer and method for preparing the same
KR20190104057A (en) * 2017-02-10 2019-09-05 미라클 케미컬스 씨오., 엘티디. Thermoplastic Silicone-Polyurethane Elastomer and Method for Making the Same
CN107880399A (en) * 2017-12-26 2018-04-06 肖彬 Automobile decoration piece polypropylene plastics and its production technology
CN108192554A (en) * 2017-12-28 2018-06-22 宁波凯耀电器制造有限公司 A kind of thermostable transparent glue and preparation method thereof
CN108192554B (en) * 2017-12-28 2020-07-28 宁波凯耀电器制造有限公司 High-temperature-resistant transparent adhesive and preparation method thereof
CN108659196A (en) * 2018-03-27 2018-10-16 中科宏德(北京)科技发展有限公司 A kind of thermoplastic polyurethane elastomer and preparation method thereof
CN108912299B (en) * 2018-08-01 2021-01-05 浙江华峰热塑性聚氨酯有限公司 Calendering-grade high-temperature-resistant thermoplastic polyurethane elastomer and preparation method thereof
CN108912299A (en) * 2018-08-01 2018-11-30 浙江华峰热塑性聚氨酯有限公司 Roll grade high-temperature-resistant thermoplastic polyurethane elastomer and preparation method thereof
CN110218439A (en) * 2019-07-15 2019-09-10 美瑞新材料股份有限公司 A kind of tough high rigidity thermoplastic polyurethane elastomer and preparation method thereof
CN110804156A (en) * 2019-11-07 2020-02-18 中天科盛(上海)企业发展股份有限公司 High-strength anti-aging thermoplastic polyurethane elastomer and preparation method thereof
CN112519164A (en) * 2020-11-11 2021-03-19 江苏铁锚玻璃股份有限公司 Preparation method of special-shaped transparent part
CN112979904A (en) * 2021-02-23 2021-06-18 美瑞新材料股份有限公司 Low molecular weight polyurethane resin and application thereof in tackifying resin
CN112979904B (en) * 2021-02-23 2022-10-14 美瑞新材料股份有限公司 Low molecular weight polyurethane resin and application thereof in tackifying resin

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Application publication date: 20160615