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CN-116284574-B - Polymer compatilizer and preparation method and application thereof

CN116284574BCN 116284574 BCN116284574 BCN 116284574BCN-116284574-B

Abstract

The invention provides a polymer compatilizer, a preparation method and application thereof, wherein the preparation raw materials of the polymer compatilizer comprise, by weight, 90-100 parts of polyolefin, 0.5-5 parts of silane coupling agent and 0.01-1 part of initiator, and the silane coupling agent comprises a combination of at least two double bond-containing silane coupling agents. The polymer compatilizer is solid particles at normal temperature, has the advantages of easy blending and feeding of macromolecules, has high reactivity, enhances the bonding effect on inorganic fillers, forms different coupling effects with the inorganic fillers, and synergistically enhances the compatibility and interfacial binding force between the inorganic fillers and a polymer system, thereby realizing the enhancement and toughening of the plastic composite material. In the recycled PE composition containing the polymer compatilizer, the recycled PE has good compatibility with inorganic filler and strong interfacial binding force, and the mechanical property of the PE composition is obviously improved, so that the PE composition has excellent strength, toughness and impact resistance.

Inventors

  • YU HONGJIE
  • LI XIAOBO
  • WANG JINYAO
  • ZHANG HONG
  • ZHAO ZHE

Assignees

  • 万华化学（宁波）有限公司
  • 万华化学集团股份有限公司

Dates

Publication Date
20260512
Application Date
20211221

Claims (20)

  1. 1. The polymer compatilizer is characterized by comprising the following raw materials in parts by weight: 90-100 parts of polyolefin Silane coupling agent 0.5-5 parts Initiator 0.01-1 part 0.1-1 Part of antioxidant 0.1-1 Part of lubricant; The silane coupling agent comprises a combination of a first silane coupling agent and a second silane coupling agent; the first silane coupling agent is different from the second silane coupling agent, and is each independently selected from any one of vinyl trimethoxy silane, vinyl triethoxy silane, vinyl tri (2-methoxyethoxy) silane, vinyl triisopropoxy silane, vinyl tri-t-butoxy silane, vinyl tri-t-butyl peroxy silane, vinyl triacetoxy silane or methacryloxypropyl trimethoxy silane; the mass ratio of the first silane coupling agent to the second silane coupling agent is 1 (0.5-1.5); the polymer compatilizer is prepared by the following method, which comprises the following steps: mixing polyolefin, an initiator, an antioxidant and a lubricant to obtain a mixture, and reacting the mixture with a silane coupling agent to obtain the polymer compatilizer.
  2. 2. The polymer compatibilizer of claim 1 wherein the polyolefin comprises any one or a combination of at least two of polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-propylene copolymer, or ethylene-octene copolymer.
  3. 3. The polymer compatibilizer of claim 2 wherein said polyolefin is an ethylene-octene copolymer.
  4. 4. A polymer compatibilizer according to claim 3 wherein the mass percentage of octene-based structural units in the ethylene-octene copolymer is 30-40%.
  5. 5. The polymer compatibilizer of claim 1 wherein said initiator is an organic peroxide.
  6. 6. The polymer compatibilizer of claim 1 wherein the initiator comprises any one or a combination of at least two of dicumyl peroxide, bis-t-butylperoxyisopropyl benzene, 2, 5-dimethyl-2, 5-bis (t-butylperoxy) -3-hexyne, 2, 5-dimethyl-2, 5-bis (t-butylperoxy) hexane, benzoyl peroxide, t-butyldicarbonate, or t-butyl peroxy-2-ethylhexyl carbonate.
  7. 7. The polymer compatibilizer of claim 1 wherein said antioxidant comprises a hindered phenol antioxidant and/or a phosphite antioxidant.
  8. 8. The polymer compatibilizer of claim 1 wherein said antioxidant comprises any one or a combination of at least two of pentaerythritol tetrakis (β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate), n-stearyl β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, or tris (2, 4-di-tert-butylphenyl) phosphite.
  9. 9. The polymer compatibilizer of claim 1 wherein said lubricant comprises any one or a combination of at least two of a fatty acid soap based lubricant, a silicone based lubricant, or a low molecular wax lubricant.
  10. 10. A process for preparing a polymer compatibilizer according to any one of claims 1 to 9, comprising mixing a polyolefin with an initiator to obtain a mixture, reacting the mixture with a silane coupling agent to obtain the polymer compatibilizer; The mixture also comprises an antioxidant and a lubricant.
  11. 11. The method of claim 10, wherein the temperature of the reaction is 150-250 ℃.
  12. 12. The method of claim 10, wherein the reaction is carried out in a screw extruder.
  13. 13. The method of claim 12, wherein the screw extruder has a screw speed of 250-350 rpm.
  14. 14. The method of claim 10, wherein the residence time of the melt in the screw during the reaction is from 30 to 90 s.
  15. 15. The method of claim 10, wherein the post-reaction further comprises a step of granulating.
  16. 16. The preparation method of the polymer compatilizer is characterized by comprising the steps of uniformly mixing polyolefin, an initiator, an antioxidant and a lubricant to obtain a mixture, carrying out melt reaction on the mixture and a silane coupling agent in a screw extruder, extruding and granulating to obtain the polymer compatilizer, wherein the temperature of the melt reaction is 150-250 ℃, the screw rotating speed is 250-350 rpm, and the residence time of a melt is 30-90 s.
  17. 17. A polyethylene composition comprising a combination of polyethylene, a filler, and the polymer compatibilizer of any one of claims 1 to 9.
  18. 18. The polyethylene composition of claim 17, wherein the polyethylene comprises recycled polyethylene.
  19. 19. The polyethylene composition of claim 17 wherein the filler comprises an inorganic filler.
  20. 20. The polyethylene composition according to claim 17, wherein the polyethylene composition comprises the following components in parts by weight: 40-60 parts of recycled polyethylene 30-50 Parts of inorganic filler 1-5 Parts of a polymer compatilizer.

Description

Polymer compatilizer and preparation method and application thereof Technical Field The invention belongs to the technical field of polymer materials, and particularly relates to a polymer compatilizer, a preparation method and application thereof. Background Recycling of recycled plastics is an important way to solve current environmental problems. In the use of recycled plastics, powders such as calcium carbonate, fibers, talc and the like are generally filled for the purpose of reinforcement, toughening and cost reduction. The binding capacity of high molecular weight polymers and filler powders is limited, and it is common practice in the industry to add coupling agents to the mixture system in order to improve the compatibility between the polymer and filler powder. The coupling agent commonly used at present comprises maleic anhydride graft or micromolecular silane coupling agent, for example CN107973954A discloses a reinforced modified polyethylene reclaimed material which is prepared from the following components, by weight, 30-75 parts of polyethylene reclaimed material, 10-30 parts of low-density polyethylene, 5-15 parts of maleic anhydride grafted polypropylene wax, 10-25 parts of medium-alkali glass fiber, 0.01-0.02 part of antioxidant and 0.5-2 parts of di-tert-butylperoxy diisopropylbenzene, wherein the maleic anhydride grafted polypropylene wax enables the material to have certain polarity and reactivity, thereby improving the compatibility of the polyethylene and glass fiber. CN107973955A discloses a high-toughness low-cost polyethylene filling master batch and a preparation method thereof, the components of the high-toughness low-cost polyethylene filling master batch comprise 10-20 parts of polyethylene reclaimed materials, 10-30 parts of low-density polyethylene, 2-6 parts of maleic anhydride grafted polypropylene wax, 75-85 parts of inorganic mineral filler, 1.5-1.7 parts of 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane, 0.01-0.02 part of antioxidant and 1.2-3 parts of lubricant, and the filling master batch expands the application range of regenerated plastics and has good mechanical properties. Maleic anhydride grafts such as maleic anhydride grafted polypropylene wax and the like are easy to be uniformly blended with plastic particles in a polymer system, but the maleic anhydride has weak reactivity on inorganic fillers, so that the problem of interfacial compatibility between the plastic particles and the inorganic fillers cannot be effectively solved, and the mechanical property is limited. CN107418025A discloses a calcium carbonate-containing recycled high-density polyethylene reinforced and toughened composite material, which comprises the following raw materials of 10-50 parts of calcium carbonate, 50-90 parts of recycled high-density polyethylene, 0.1-2 parts of silane coupling agent, 1-30 parts of maleic anhydride grafted polyethylene, 0.1-2 parts of oxidized polyethylene wax and 0.1-2 parts of antioxidant, wherein the material has good reinforcing and toughening effects on the recycled high-density polyethylene. CN102863677A discloses a special material for modified regenerated polyethylene pipes and pipe fittings and a preparation method thereof, the special material comprises 5-55% of polyethylene, 10-70% of recycled polyethylene, 5-40% of calcium carbonate, 5-40% of talcum powder, 0.5-3% of silane coupling agent, toughening agent, impact modifier, dicumyl peroxide, antioxidant 1010, polyethylene wax, calcium stearate, pigment and the like, and the material utilizes the recycled polyethylene to replace new polyethylene, thereby relieving the raw material and cost pressure existing in the production of the new polyethylene. Although the silane coupling agent has good bonding effect on the inorganic filler, the silane coupling agent is liquid, is complex in operation, inconvenient in feeding and difficult to blend uniformly with the plastic particles, so that the interfacial compatibility of the plastic particles and the inorganic filler is difficult to promote effectively. Therefore, developing a compatibilizer which is convenient to mix and can effectively improve the compatibility of inorganic fillers and plastic particles is a problem to be solved in the field. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a polymer compatilizer, a preparation method and application thereof, wherein the polymer compatilizer is a polyolefin graft, has the advantage of easy blending and feeding of macromolecules, has high reactivity, has strong bonding effect on inorganic filler, can effectively promote interfacial compatibility and bonding of plastic particles and the inorganic filler, and is particularly suitable for recycling a polyethylene system. To achieve the purpose, the invention adopts the following technical scheme: In a first aspect, the invention provides a polymer compatilizer, which is prepared from the following raw materials