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Preparation method of flexible poly-alpha-methylstyrene resin

A technology of methyl styrene and styrene derivatives, applied in the field of petroleum resins, can solve the problems of uncontrollable rigid structural groups, too strong molecular rigidity, limited application range, etc., and achieve environmental protection and glass transition temperature The effect of low cost and simple technical process

Pending Publication Date: 2022-03-25
HENGHE MATERIALS & SCI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above process has problems such as the inability to control the rigid structural groups in the product molecule, and the molecular rigidity is too strong, and its application range is limited.

Method used

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  • Preparation method of flexible poly-alpha-methylstyrene resin
  • Preparation method of flexible poly-alpha-methylstyrene resin
  • Preparation method of flexible poly-alpha-methylstyrene resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] α-Methylstyrene and 2,3,3-trimethyl-1-butene are mixed as ingredients in a mass ratio of 1:0.25, and 55% of the total mass of the total material is put into a high-pressure reactor with stirring in advance. Hexanaphthene, then add the boron trifluoride that accounts for 0.2% of total material quality, and account for the 2,6-di-tert-butyl-4-methylpyridine of 3.03% of total material quality (with boron trifluoride mol ratio being 1 : 2), put into the mixed ingredients, the feeding time is 0.5h, and react at 10°C for 0.5h to obtain the polymerization liquid. Add 3.5% calcium hydroxide and 1.0% methanol to the polymerization solution to stop the reaction; first remove catalyst and other solid by-products through a 60-mesh bag filter bed, then remove residual insolubles with an alumina bed to obtain water White resinous liquid.

[0033] The above resin liquid is preheated to 55°C, transported to a falling film evaporator protected by nitrogen, at an operating pressure of 0...

Embodiment 2

[0035] α-Methylstyrene and 2,3,3-trimethyl-1-butene are mixed as ingredients in a mass ratio of 1:0.25, and 55% of the total mass of the total material is put into a high-pressure reactor with stirring in advance. Cyclohexane, then add boron trifluoride accounting for 0.2% of the total material quality, and nitrobenzene (1:2 with boron trifluoride molar ratio) accounting for 1.82% of the total material quality, drop into the mixed ingredients, and the feeding time is 0.5 h, and reacted at 10° C. for 0.5 h to obtain a polymerization solution. Add 3.5% calcium hydroxide and 1.0% methanol to the polymerization solution to stop the reaction; first remove catalyst and other solid by-products through a 60-mesh bag filter bed, then remove residual insolubles with an alumina bed to obtain water White resinous liquid.

[0036] The above resin liquid is preheated to 55°C, transported to a falling film evaporator protected by nitrogen, at an operating pressure of 0.03MPa, at a temperatu...

Embodiment 3～6

[0038] In Examples 3 to 6, cationic copolymerization was carried out with different ratios of α-methylstyrene (α-MS) and 2-methyl-1-octene (2M1O), and the rest of the conditions were the same as in Example 2.

[0039]

[0040]

[0041] Known from above-mentioned embodiment, along with the increase of 2-methyl-1-octene content in the proportioning raw material, the degree of polymerization index of modified poly-alpha-methylstyrene resin such as Mn changes little, and softening point and glass The melting temperature decreased significantly, that is, the flexibility of its molecular structure was strengthened, and the compatibility with metallocene polyolefin and other substrates was improved; due to the influence of aromatic and aliphatic copolymerization, the regularity of its molecular structure decreased, so the color index yellowness The index fell slightly.

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Abstract

The invention relates to a preparation method of flexible poly (alpha-methylstyrene) resin, which comprises the following steps: mixing alpha-methylstyrene or a mixture of alpha-methylstyrene and styrene derivatives with C7-C9 chain aliphatic monoolefine to serve as a raw material, adding a polarity regulator, and performing cationic catalytic polymerization to obtain the flexible poly (alpha-methylstyrene) resin with proper softening point and molecular weight, extremely light color number and high flexibility. The invention relates to flexible poly-alpha-methylstyrene resin with relatively low glass transition temperature. Through cationic polymerization, a proper amount of aliphatic chain groups are introduced into an aromatic resin structure with relatively high rigidity, so that the flexibility of the aromatic resin structure is improved, the modified resin with balanced rigidity enhancing performance and toughness enhancing performance is obtained, and the modified resin can be applied to modification of metallocene polyolefin, polypropylene, APAO and the like.

Description

technical field [0001] The invention belongs to the field of petroleum resins, in particular to a preparation method of flexible poly-alpha-methylstyrene resin. Background technique [0002] Poly α-methylstyrene resin (PAMS) is a kind of monomer petroleum resin with special properties. Because of its high proportion of benzene rings in its structure, it has strong molecular rigidity, so it can be used as ABS, PVC, PP , TPU and other injection molding additives. Research by Zhang Quan, Wang Wentao and others found that in the processing of thermoplastics such as SBS and PP / SBS, poly-α-styrene resin can be used as an excellent bridging agent for SBS in PVC plastics, without destroying the original microstructure of SBS. Phase separation structure, improving the compatibility of polystyrene and butadiene without phase separation, while still retaining the characteristics of SBS thermoplastic elastomers, reducing the apparent viscosity of the blend system and improving the impa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/12C08F210/14C08F2/38C08F4/14
CPCC08F212/12C08F210/14C08F2/38C08F4/14
Inventor 杨孟君王斌孙向东
Owner HENGHE MATERIALS & SCI TECH CO LTD
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