Ultrahigh-flowability dynamic vulcanized thermoplastic elastomer and preparation method thereof

A thermoplastic elastomer and dynamic vulcanization technology, applied in the field of thermoplastic elastomer materials and their preparation, can solve the problems of limited oil absorption capacity of EPDM rubber, lower temperature resistance of finished products, lower system viscosity, etc., and achieve excellent physical and mechanical properties, Good heat resistance and improved modulus

Inactive Publication Date: 2019-10-15
江苏金陵奥普特高分子材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although dynamically vulcanized thermoplastic elastomer materials have excellent performance in many aspects, their flow properties are poor, and it is not easy to be used for injection molding of large devices and precision injection molding of small devices, which largely limits their use in high-end fields. application in
The root cause of its poor fluidity is that the mass percentage of EPDM in the system exceeds 50%. Although the "phase inversion" is achieved during the dynamic vulcanization process, the fluidity of the product is still poor. , In the process of injection molding finished products, problems such as lack of glue, injection flow lines and weld lines are prone to occur, resulting in high defective and scrap rates
[0004] In order to solve this problem, there is a method of reducing the viscosity of the system and increasing the fluidity of the system by adding a large amount of extender oil, but this method not only leads to a significant decrease in the physical and mechanical properties of the elastomer such as tensile strength and elastic modulus, but also due to the ternary Ethylene-propylene rubber has limited oil absorption capacity, and a large amount of extender oil is likely to cause a risk of oil bleeding
[0005] In addition, there is also a method to reduce the viscosity of the system and increase the fluidity of the system by adding POE, a low-viscosity elastomer. However, due to the low glass transition temperature and softening temperature of POE, the temperature resistance of the finished product is reduced, and the surface is easy to stick. Requirements for quality finished products on temperature resistance and product appearance

Method used

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  • Ultrahigh-flowability dynamic vulcanized thermoplastic elastomer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Weigh 1Kg EPDM rubber (Mooney viscosity 60, ethylene content 66%, the third monomer ethylidene norbornene content 5%), 0.5Kg homopolypropylene (melt index is 10g / 10min) , 0.2Kg ultra-high fluidity atactic polypropylene (melt index: 100 g / 10min (230°C.2.16kg)). Add it into the high-speed stirring pot, then add 2g of antioxidant, 15g of lubricant and 0.3Kg of superfine calcium carbonate, turn on the high-speed stirring pot for homogenization and mixing for 1min (set the speed at 500r / min), pass the resulting mixture through the twin-screw After processing by the extruder, intermediates are obtained;

[0037] 2) Add 2g of cross-linking agent p-bis-tert-butyl peroxide cumene (BIPB), 10g of auxiliary cross-linking agent triallyl isocyanurate (TAIC) in the intermediate obtained in step (1), 10g light stabilizer and 15g lubricant are added in the high-speed mixer, after stirring at a high speed for 1min (the setting speed is 500r / min), the resulting mixture is processed by...

Embodiment 2

[0039] 1) Weigh 1Kg of EPDM rubber (Mooney viscosity 60, ethylene content 66%, third monomer ethylidene norbornene content 5%), 1Kg homopolypropylene (melt index is 10 g / 10min) , 0.5Kg ultra-high fluidity atactic polypropylene (melt index is 100g / 10min (230 ° C. 2.16kg)) into the high-speed stirring pot, then add 2g of antioxidant, 15g of lubricant and 0.3Kg of Ultrafine calcium carbonate, open the high-speed stirring pot homogenization and mix 1min (setting rotating speed is 500r / min), after gained mixture is processed by twin-screw extruder, obtain intermediate;

[0040] 2) Add 2g of cross-linking agent p-bis-tert-butyl peroxide cumene (BIPB), 10g of auxiliary cross-linking agent triallyl isocyanurate (TAIC) in the intermediate obtained in step (1), 10g light stabilizer and 15g lubricant are added in the high-speed mixer, after stirring at high speed for 1min (the setting speed is 500r / min), the resulting mixture is processed by a twin-screw extruder, and 150g paraffin oil i...

Embodiment 3

[0042] 1) Weigh 1Kg EPDM rubber (Mooney viscosity 60, ethylene content 66%, the third monomer ethylidene norbornene content 5%), 0.5Kg homopolypropylene (melt index is 10g / 10min) , 0.2Kg ordinary random polypropylene (melt index is 15g / 10min (230 ℃.2.16kg)) joins in the high-speed stirring pot, then adds the superfine calcium carbonate of 2g antioxidant, 15g lubricant and 0.3Kg, Turn on the high-speed stirring pot for homogenization and mixing for 1min (the setting speed is 500r / min), and after the resulting mixture is processed by a twin-screw extruder, an intermediate is obtained;

[0043] 2) Add 2g of cross-linking agent p-bis-tert-butyl peroxide cumene (BIPB), 10g of auxiliary cross-linking agent triallyl isocyanurate (TAIC) in the intermediate obtained in step (1), 10g light stabilizer and 15g lubricant are added in the high-speed mixer, after stirring at a high speed for 1min (the setting speed is 500r / min), the resulting mixture is processed by a twin-screw extruder, an...

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Abstract

The invention relates to an ultrahigh-flowability dynamic vulcanized thermoplastic elastomer and a preparation method thereof. The preparation method comprises the following steps: after homogenizingand mixing ethylene-propylene-diene monomer, atactic polypropylene, fillers and a first aid into a high-speed stirring pot for 1 to 2 minutes, performing plasticizing granulation in a double-screw extruding machine to generate an intermediate; and after homogenizing and mixing the obtained intermediate, a crosslinking agent, an assistant crosslinking agent and a second aid into a high-speed mixingmachine for 1 to 2 minutes, adding filling oil through a liquid feeding port of the high-speed mixing machine and performing dynamic vulcanized granulation through the double-screw extruding machineto prepare the ultrahigh-flowability dynamic vulcanized thermoplastic elastomer which has ultrahigh flowability, excellent physical and mechanical properties and high elasticity, and has important significance in broadening the application field of thermoplastic elastomers.

Description

technical field [0001] The invention relates to a thermoplastic elastomer material and a preparation method thereof, in particular to a dynamic vulcanized thermoplastic elastomer with ultra-high fluidity and a preparation method thereof. Background technique [0002] Dynamic vulcanization thermoplastic elastomer material has excellent weather resistance, ozone resistance, ultraviolet resistance and good high temperature performance, electrical performance, impact performance, and it can be processed without traditional vulcanization process, and can be processed with standard thermoplastic processing equipment It has the advantages of simple processing, continuous production, low processing cost, and recyclable leftovers. Its consumer market is mainly the automobile industry, and it has also been widely used in wires and cables, special hoses, industrial components, home appliances, and mechanical parts. Its fields are gradually expanding, and its usage is increasing year by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08L23/12C08L91/06C08K3/26C08K5/14C08K5/3492C08K13/02
CPCC08K2003/265C08L23/12C08L23/16C08L2201/08C08L2205/025C08L2205/035C08L2207/14C08L91/06C08K3/26C08K5/14C08K5/34924C08K13/02
Inventor 陈忠基吴佳骏
Owner 江苏金陵奥普特高分子材料有限公司
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