Environment-friendly polyethylene compatilizer and preparation method thereof
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A polyethylene and compatibilizer technology, applied in the polymer field, can solve the problems of unfavorable environmental protection and health, maleic anhydride is irritating, and affects the normal use of products, etc., and achieves excellent processing stability, low residue, good Environmentally friendly effects
Inactive Publication Date: 2012-07-04
SHANGHAI SUNNY
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Problems solved by technology
[0004] At present, the preparation method of functionalized grafted polyethylene mostly uses a twin-screw extruder to directly carry out reaction grafting. This method has a wide range of applications and requires less investment in equipment. However, due to the short reaction time, the grafting efficiency is low. high
The traditional method is to increase the content of functional monomers such as maleic anhydride to obtain a high grafting rate, but polyethylene molecular chains are prone to crosslinking after being initiated by free radicals, and the presence of excess maleic anhydride will also promote this reaction. , which inevitably leads to excessive cross-linking
In addition, the residual maleic anhydride monomer has a strong irritating taste, which is not conducive to environmental protection and human health.
The residual initiator may also lead to further cross-linking of polyethylene molecular chains during product storage or use, which will affect the normal use of the product
Method used
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Embodiment 1
[0035] The polyethylene uses LLDPE imported from South Korea, the initiator uses 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, the antioxidant is 168 and 1010 from CIBA Company, and the lubricant uses stearin Calcium acid, maleic anhydride is used as functional monomer. Processed by traditional technology, put the above components into the high mixer according to the proportion and mix for 3-5 minutes, discharge the material, and then extrude and granulate with the screw extruder, the processing temperature is 80-200 ℃, the screw speed is 450 rpm.
Embodiment 2
[0037] The polyethylene is LLDPE imported from South Korea, and the initiator is a compound of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and bis-tert-butylperoxycumene, with a ratio of 2:3, the functional monomer is maleic anhydride, the antioxidant is CIBA 168 and 1010, the lubricant is calcium stearate, and the anti-crosslinking agent is triphenyl phosphite. Processed by traditional technology, put the above components into the high mixer according to the proportion and mix for 3-5 minutes, discharge the material, and then extrude and granulate with the screw extruder, the processing temperature is 80-200 ℃, the screw speed is 450 rpm.
Embodiment 3
[0039] The polyethylene is LLDPE imported from South Korea, and the initiator is a compound of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane and bis-tert-butylperoxycumene, which has a single function The body uses maleic anhydride, the antioxidants are CIBA 168 and 1010, the lubricant uses calcium stearate, and the anti-crosslinking agent uses triphenyl phosphite. Put the above components into the high mixer according to the proportion and mix them for 3-5 minutes, discharge the material, and extrude it with a twin-screw extruder. Granules, the processing temperature is 80-200°C, the screw speed is 450 rpm, and the ultrasonic power is 400W.
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Abstract
The invention relates to an environment-friendly polyethylene compatilizer and a preparation method thereof. The environment-friendly polyethylene compatilizer comprises the following components in percentage by weight: 75 to 98 percent of polyethylene, 1 to 10 percent of functional monomer, 0.1 to 10 percent of initiator, 0.1 to 9 percent of anti-crosslinking agent, 0.1 to 3 percent of antioxidant and 0.1 to 3 percent of lubricating agent. The preparation method comprises the following steps of: placing the components in a highly mixing machine in a ratio; mixing; feeding the mixture into a double-screw extruder in a side feeding manner; extruding by using the double-screw extruder; and performing ultrasonic treatment to obtain the product. Compared with the prior art, the environment-friendly polyethylene compatilizer and the preparation method thereof have the advantages that: the polyethylene compatilizer with high grafting ratio is obtained by a compound initiating system and an ultrasonic technology; the problems of high monomer residual amount and serious gelling phenomenon are solved; emission of toxic substances is reduced; and the environment and healthiness of users are protected.
Description
technical field [0001] The invention relates to the field of macromolecules, in particular to an environment-friendly polyethylene compatibilizer and a preparation method thereof. Background technique [0002] As a general-purpose plastic, polyethylene is widely used for its large output, good performance and low price. However, due to its low surface energy, its molecules are chemically inert, resulting in poor adhesion, wettability, printing and dyeing properties, gas permeability, antistatic properties, and poor compatibility with other polar polymers and inorganic fillers. These shortcomings restrict the further application of polyethylene. Grafting functionalization of polyethylene can endow it with some special properties, which can well improve the interfacial properties of the blended filler material, thereby significantly improving the performance of the composite material. [0003] At present, functionalized grafted polyethylene has been widely used in the plasti...
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