Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing styrene/isoprene in-situ toughened polypropylene

A technology of isoprene and polypropylene, which is applied in the field of in-situ toughened polypropylene preparation, can solve the problems of heavy odor, decrease of melting index, sacrifice of tensile strength and modulus of polypropylene matrix, etc., and achieve good performance, low cost effect

Inactive Publication Date: 2013-01-30
EAST CHINA UNIV OF SCI & TECH
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN102504406A uses bis-tert-butyl peroxide as vulcanizing agent, sulfur as co-vulcanizing agent, and ethylene-vinyl acetate copolymer as toughening agent to modify polypropylene. The impact strength of the product obtained in this invention is higher than that of pure polypropylene It has increased by about one time, and the melt index has also dropped significantly. The toughening agent is uniformly dispersed in the polypropylene matrix with a smaller particle size, but due to the use of sulfur, the smell is very heavy
However, the patented process is complicated, and the nanoparticles increase the cost
[0006] Chinese patent CN101698722A provides a method for preparing ethylene-propylene rubber grafted maleic anhydride modified polypropylene toughening masterbatch, the impact strength of the product can be increased by 20 times, but the addition of ethylene-propylene rubber is 15 to 25 parts, which is bound to Tensile strength and modulus of sacrificial polypropylene matrix
[0007] Chinese patent CN102432762A provides a method for preparing grafted polypropylene with high melt strength, using maleic anhydride, isoprene, and styrene as modified monomers, and the melt index of the obtained product can be reduced by up to 85%. The sag value at 190°C is 12-19.5cm, and the melt strength is greatly improved, but the invention does not involve the mechanical properties of the product

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing styrene/isoprene in-situ toughened polypropylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] At room temperature, 0.030kg of isoprene, 0.030kg of styrene and 0.003kg of di-tert-butyl peroxide are mixed uniformly; the temperature of the nine-stage heating barrel of the twin-screw extruder is preset to 70°C along the extrusion direction. , 170℃, 200℃, 200℃, 200℃, 200℃, 200℃, 200℃, 205℃, the screw speed is 100r / min; when the heating cylinder temperature reaches the set temperature, the 3kg melt index is 2.20g / 10min Polypropylene pellets from the first section of the extruder are fed into the extruder at a feed rate of 0.1kg / min; at the same time, styrene, isoprene and di-tert-butyl peroxide are fed from the metering pump The liquid feed port of the third stage is injected at a rate of 0.002kg / min; vacuum devolatilization is performed at the eighth stage of the extruder. The obtained samples were pelletized, prepared, and tested for melt index and mechanical properties. The results are shown in Table 1.

Embodiment 2

[0028] At room temperature, 0.045kg of isoprene, 0.015kg of styrene and 0.0024kg of di-tert-butyl peroxide are mixed uniformly; the temperature of the nine-stage heating barrel of the twin-screw extruder is preset to be 70°C along the extrusion direction. , 170℃, 200℃, 200℃, 200℃, 200℃, 200℃, 200℃, 205℃, the screw speed is 100r / min; when the heating cylinder temperature reaches the set temperature, the 3kg melt index is 2.20g / 10min Polypropylene pellets from the first section of the extruder are fed into the extruder at a feed rate of 0.1kg / min; at the same time, styrene, isoprene and di-tert-butyl peroxide are fed from the metering pump The liquid feed port of the third stage is injected at a rate of 0.002kg / min; vacuum devolatilization is performed at the eighth stage of the extruder. The obtained samples were pelletized, prepared, and tested for melt index and mechanical properties. The results are shown in Table 1.

Embodiment 3

[0030] At room temperature, 0.015kg of isoprene, 0.015kg of styrene and 0.0012kg of di-tert-butyl peroxide are mixed uniformly; the temperature of the nine-stage heating barrel of the twin-screw extruder is preset to 70°C along the extrusion direction. , 170℃, 200℃, 200℃, 200℃, 200℃, 200℃, 200℃, 205℃, the screw speed is 100r / min; when the heating cylinder temperature reaches the set temperature, the 3kg melt index is 2.20g / 10min Polypropylene pellets from the first section of the extruder are fed into the extruder at a feed rate of 0.1kg / min; at the same time, styrene, isoprene and di-tert-butyl peroxide are fed from the metering pump The liquid feeding port of the third stage is injected at a speed of 0.001kg / min; vacuum devolatilization is performed at the eighth stage of the extruder. The obtained samples were pelletized, prepared, and tested for melt index and mechanical properties. The results are shown in Table 1.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
melt flow indexaaaaaaaaaa
melt flow indexaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing styrene / isoprene in-situ toughened polypropylene, and relates to a method for preparing styrene / isoprene in-situ toughened polypropylene by reactive extrusion. According to the method, raw materials comprise polypropylene, styrene, isoprene and a peroxide initiator. The method is characterized by comprising the following steps of: adding the polypropylene from a main charging hole of a first section of an extruder; injecting styrene, isoprene monomers and the peroxide initiator into a third section of the extruder by a metering pump; and performing melt grafting at the reaction temperature of between 170 and 230 DEG C to obtain the in-situ toughened polypropylene material with high melt strength, wherein the toughness of the polypropylene can be improved obviously under the condition of the low using quantity of the monomers, the breakage elongation can be increased to 65 percent, and tensile strength of the polypropylene is equal to and even higher than that of pure polypropylene; and by the method, a toughening effect of a blending system of the polypropylene and 5 percent of butadiene-styrene-butadiene (SBS) can be achieved. According to the method, a process is simple, easy to control, low in cost and environment-friendly, and the product can be used for foaming and can be used as engineering stressed materials to be applied to the field of automobile industry.

Description

Technical field [0001] The invention relates to a method for preparing in-situ toughened polypropylene, in particular to a method for preparing styrene and isoprene co-grafted polypropylene by reactive extrusion. Background technique [0002] Polypropylene (PP) has become increasingly important in the plastic family for its excellent heat resistance and environmental friendliness. However, the semi-crystalline structure of PP leads to its low-temperature brittleness and poor impact performance, which limits its application in the field of engineering stressed materials. Therefore, the toughening modification of polypropylene in order to improve its toughness becomes the key technology. [0003] At present, the methods of toughening and modifying polypropylene are blending toughening, shape control toughening, cross-linking toughening, low foaming toughening, etc. Among them, blending modification is the most common, which uses similar solubility parameters. Reaction principle: Two...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F212/08C08F236/08C08F4/34B29C47/00B29C47/92B29C48/92
Inventor 夏浙安胡吉霞陈建定王彦华丁锐
Owner EAST CHINA UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com