A kind of technology that produces cross-linking side reaction in the process of controlling grafting reaction
A technology of grafting reaction and reaction process, applied in the field of preparation technology of polymer functional materials, can solve the problems of increased viscosity, difficulty in extrusion, poor flow performance, etc., achieves high grafting rate, improves application effect, and broadens application field effect
Active Publication Date: 2021-04-06
NANJING TANGCHENG PLASTIC
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Problems solved by technology
Melt-grafting of polyethylene with maleic anhydride is a common method to improve the polarity of polyethylene. However, the problem with the melt-grafting method is that polyethylene will undergo cross-linking reactions under the action of maleic anhydride and peroxides. The cross-linking reaction causes the viscosity of the system to increase greatly, the flow performance becomes poor and extrusion is difficult
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Embodiment
[0018] The process of controlling the cross-linking side reaction during the grafting reaction process, the polyolefin resin to be modified is first added to the hopper of the single-screw extrusion reaction plastic extruder, and plasticized and extruded.
[0019] In the embodiment, after the feeding and plasticizing section is completed, three metering devices are respectively installed in sequence from the second screw channel of the melting reaction section, and the second metering device is installed after the first metering device every two screw channels , After the second metering device, a third metering device is set every two screw grooves.
[0020] EXAMPLE Add the initiator according to the formula in the first metering device, add the polar group according to the formula in the second metering device, add the crosslinking inhibitor according to the formula in the third metering device, three metering devices turned on at the same time. Reactive extrusion, drawing,...
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The invention belongs to the technical field of polymer materials, and relates to a technique for controlling side reactions of crosslinking in the process of grafting reaction, which is characterized in that in the process of melting grafting reaction, the method of sequentially adding auxiliary agents is used to control the process of melting and grafting. The cross-linking side reaction that occurs during the technical reaction, the auxiliary agent includes an initiator, a polar group and a cross-linking inhibitor. The present invention controls the cross-linking side reactions that occur during the melting grafting reaction by sequentially adding initiators, polar groups, and cross-linking inhibitors, and effectively controls the cross-linking side reactions under the condition of increasing the grafting rate. . The maleic anhydride grafted polyethylene produced by the method of the invention has a relatively high grafting rate, which improves the application effect of this type of polymer functional material and broadens the application field.
Description
technical field [0001] The invention belongs to the field of polymer materials, and relates to a preparation process for producing a polymer functional material containing polar groups through grafting reaction by extrusion melting method. Background technique [0002] Polyolefin resins are widely used as general-purpose resins due to their excellent thermal properties, mechanical properties and processing properties. However, the non-polarity of polyolefin resins makes it poorly compatible with polar materials, resulting in poor adhesion, dyeability, hydrophilicity, and compatibility with organic and inorganic fillers, which limits the use of polyolefin resins. application of resins. Through the functional modification of the polyolefin resin, the adhesion, compatibility and dyeing performance between it and other polymer materials can be improved, and the application range of the polyolefin resin is broadened. [0003] Grafting modification of polyolefin is one of the im...
Claims
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IPC IPC(8): C08F255/02C08F222/06C08F2/01
CPCC08F2/01C08F255/02C08F222/06
Inventor 沈文祥
Owner NANJING TANGCHENG PLASTIC