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Grafting reaction method and device

A grafting reaction and short-chain technology, applied in the field of grafting reaction methods and devices thereof, can solve the problems of incapable of mass industrial production, small addition amount, limited effect, etc. Low cross-linking possibility and small size of cross-linked product

Active Publication Date: 2016-04-20
GUANGZHOU LUSHAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods of controlling grafting side reactions have all suppressed the occurrence of crosslinking side reactions to a certain extent, but the effect is limited, and some cannot be industrialized in batches.
[0004] Commonly used methods to avoid crosslinking side reactions include adding free radical scavengers or quenchers such as antioxidants, electron donors, and polymerization inhibitors, etc., but these methods are incompatible with polyethylene grafting systems, adding The problem of small quantity and not easy to disperse

Method used

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preparation example Construction

[0032] 2) Preparation of short-chain free radicals: Extruding polyolefin through twin-screws, wherein the extrusion temperature is 200-350°C, and the rotation speed is 500-1000rpm, to obtain short-chain free radicals;

[0033] The polyolefin is preferably a blend of polyethylene and polypropylene;

[0034] 3) Side feeding: Add the premixed material obtained in step 1) to the feeding end of the twin-screw extruder, and feed the short-chain free compound obtained in step 2) into the middle and rear section of the heating zone of the twin-screw extruder. The graft polymer is obtained by extrusion, wherein the extrusion temperature is 130-250°C, and the rotation speed is 300-500rpm;

[0035] Both the feeding methods of the first screw extruder and the second screw extruder adopt weightless feeding control, and the ratio of the feeding speed of the first extruder to the feeding speed of the second extruder is 4-9:1.

[0036] The present invention provides the device of above-menti...

Embodiment 1

[0041] A grafting reaction method, comprising the following steps:

[0042] 1) Premixing: Put 88kg of linear low density polyethylene (LLDPE for short) with a melt index of 4g / 10min (190°C, 2.16kg), 0.3kg of dicumyl peroxide, 1.5kg of maleic anhydride and 0.2kg of solvent oil into the High mixer premixing to obtain premixed material;

[0043] 2) Preparation of short-chain free radicals: Feed 5 kg of high-density polyethylene (referred to as HDPE) with a melt index of 6 g / 10 min (190 ° C, 2.16 kg) to the feeding end of the first twin-screw extruder through the first loss-in-weight feeding device. ), 3kg of a mixture of copolymerized polypropylene (referred to as co-PP) with a melt index of 8g / 10min (230°C, 2.16kg) and 2kg of polyolefin elastomer (referred to as POE) with a melt index of 5g / 10min (190°C, 2.16kg) , through extrusion, to obtain short-chain free radicals;

[0044] Among them, the length-to-diameter ratio of the first twin-screw extruder is 28:1, the screw diamete...

Embodiment 2

[0048] A grafting reaction method, comprising the following steps:

[0049] 1) Premixing: Put 88kg of linear low density polyethylene (LLDPE for short) with a melt index of 4g / 10min (190°C, 2.16kg), 0.3kg of dicumyl peroxide, 1.5kg of maleic anhydride and 0.2kg of solvent oil into the High mixer premixing to obtain premixed material;

[0050] 2) Preparation of short-chain free radicals: Feed 5 kg of high-density polyethylene (referred to as HDPE) with a melt index of 6 g / 10 min (190 ° C, 2.16 kg) to the feeding end of the first twin-screw extruder through the first loss-in-weight feeding device. ), 3kg of a mixture of copolymerized polypropylene (referred to as co-PP) with a melt index of 8g / 10min (230°C, 2.16kg) and 2kg of polyolefin elastomer (referred to as POE) with a melt index of 5g / 10min (190°C, 2.16kg) , through extrusion, to obtain short-chain free radicals;

[0051] Among them, the length-to-diameter ratio of the first twin-screw extruder is 28:1, the screw diamete...

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Abstract

The invention provides a grafting reaction method and device. The method specifically comprises the steps of (1) premixing, wherein polyethylene, an initiating agent, a monomer and a dispersing agent are premixed to obtain a premixed material; (2) preparation of short-chain free radicals, wherein polyolefin is extruded through twin screw extruders at high temperature and high pressure to obtain the short-chain free radicals; (3) lateral feeding, wherein the premixed material obtained in the step (1) is fed into the feeding ends of the two screw extruders, the short-chain free radicals obtained in the step (2) are laterally fed into the middle rear sections of the two screw extruders, and a graft polymer is obtained by means of extrusion. The device comprises the first screw extruder, the second screw extruder, a first weightless feeding device and a second weightless feeding device. According to the method, through coupling of the laterally fed short-chain free radicals and main-chain free radicals obtained after a polyethylene grafting reaction, macromolecular cross-linking by-products are reduced; micromolecular free radicals and a polyethylene grafting system are good in compatibility and uniform in dispersity; fisheye defects of the graft polymer are effectively reduced.

Description

technical field [0001] The invention relates to the technical field of polymer material processing, in particular to a grafting reaction method and a device thereof. Background technique [0002] Melt grafting is a grafting method with the easiest industrial production, the lowest cost and high grafting rate in chemical modification, but the side reactions of this method are difficult to control, and the dispersion of trace additives such as monomers and initiators is difficult , becomes a defect of this method. For example, in the process of polyethylene melt grafting maleic anhydride, side reactions such as polyethylene crosslinking and monomer self-polymerization lead to crystal points, black and yellow spots and unstable melt index of polyethylene grafts. , directly affect the use of this product in some high-end application fields. [0003] In order to improve the shortcomings of melt grafting, many scholars control the degree of crosslinking side reactions in the pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F222/06C08F2/01B29C47/92B29C48/92
CPCB29C48/92B29C2948/9258B29C2948/92609B29C2948/92704C08F2/01C08F255/02C08F222/06
Inventor 王明辉余鹏唐舫成汪加胜
Owner GUANGZHOU LUSHAN NEW MATERIALS
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