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CN-120648101-B - Environment-friendly self-repairing polypropylene material and preparation method thereof

CN120648101BCN 120648101 BCN120648101 BCN 120648101BCN-120648101-B

Abstract

The invention relates to an environment-friendly self-repairing polypropylene material, which is prepared by compounding polypropylene, modified silicon dioxide and itaconic acid-acrylic acid copolymer, firstly, carrying out hydroxylation treatment on the silicon dioxide, then reacting with carboxymethyl chitosan to introduce carboxymethyl chitosan into the modified silicon dioxide, and because the carboxymethyl chitosan is introduced into the modified silicon dioxide, a large number of hydroxyl groups can be introduced into the modified silicon dioxide, more hydrogen bond sites can be formed, a high-density hydrogen bond network can be formed between the modified silicon dioxide and a large number of carboxyl groups, amino groups and other polar groups in the components such as the itaconic acid-acrylic acid copolymer and the repairing agent, stronger hydrogen bond effect is generated, the combination among the components is tighter, and after the polypropylene material is scratched and damaged, the polar groups at the scratched part are promoted to be quickly recombined through the hydrogen bond effect, so that self-repairing is realized.

Inventors

  • YANG RUI
  • CHEN LONGFAN
  • LIU YOUHUA

Assignees

  • 广东永鑫华新型材料有限公司

Dates

Publication Date
20260508
Application Date
20250718

Claims (8)

  1. 1. The environment-friendly self-repairing polypropylene material is characterized by comprising the following raw materials in parts by weight: 50-60 parts of polypropylene 5-10 Parts of modified silicon dioxide 2-4 Parts of itaconic acid-acrylic acid copolymer 0.5 To 1 part of heat stabilizer 1-2 Parts of other auxiliary agents; wherein the modified silicon dioxide is a product obtained by grafting carboxymethyl chitosan with hydroxylated silicon dioxide; The other auxiliary agents are repairing agents, dispersing agents and lubricating agents; the repairing agent is polyethyleneimine.
  2. 2. The environmentally friendly self-healing polypropylene material according to claim 1, wherein the melt index of the polypropylene is 20-100g/10min.
  3. 3. The environment-friendly self-repairing polypropylene material according to claim 1, wherein, The molecular weight of the itaconic acid-acrylic acid copolymer is 1000-50000.
  4. 4. The environment-friendly self-repairing polypropylene material according to claim 1, wherein, The heat stabilizer is one or more of a phenolic heat stabilizer, an amine heat stabilizer and a phosphite ester heat stabilizer.
  5. 5. The environment-friendly self-repairing polypropylene material according to claim 1, wherein, The lubricant is one or more selected from silicone, amide and stearic acid.
  6. 6. The method for preparing an environment-friendly self-repairing polypropylene material according to any one of claims 1 to 5, comprising the steps of: s1, mixing hydroxylated silicon dioxide with carboxymethyl chitosan, and heating for reaction to obtain modified silicon dioxide; S2, uniformly mixing the modified silicon dioxide with other components to obtain the environment-friendly self-repairing polypropylene material.
  7. 7. The method for preparing the environment-friendly self-repairing polypropylene material according to claim 6, wherein, In step S1, the temperature of the heating reaction is 65-85 ℃.
  8. 8. The method for preparing the environment-friendly self-repairing polypropylene material according to claim 6, wherein, In the step S1, the mass ratio of the hydroxylated silicon dioxide to the carboxymethyl chitosan is 1-5:2-5.

Description

Environment-friendly self-repairing polypropylene material and preparation method thereof Technical Field The invention relates to the technical field of polypropylene materials, in particular to an environment-friendly self-repairing polypropylene material and a preparation method thereof. Background The polypropylene material is widely applied due to excellent comprehensive performance and low cost, but the inherent toughness of the polypropylene material is insufficient, so that the product is easy to generate microcracks and damage under the long-term use or stress effect, the service life is seriously influenced, and the potential safety hazard is brought. The traditional method for reinforcing by adding inorganic filler often aggravates the brittleness of the material due to filler agglomeration and poor interface compatibility, and the problem of damage accumulation cannot be solved. Some existing self-repairing polypropylene technologies, such as embedding microcapsule coating repairing agent or triggering repairing by external application of heat, light and other stimuli, generally have the limitations of low repairing efficiency, harsh conditions, limited repairing times, incapability of regenerating after the repairing agent is exhausted and the like. More importantly, most of repairing agents used in the technologies are synthetic chemicals which are difficult to degrade, the preparation process is complex, the environment friendliness and the sustainability are insufficient, and increasingly strict environmental protection requirements and material biocompatibility are difficult to meet. Therefore, developing a solution of polypropylene material with high efficiency, good interface bonding and excellent environmental compatibility under mild conditions becomes a key problem to be broken through at present. Disclosure of Invention Based on the above, it is necessary to provide an environment-friendly self-repairing polypropylene material, which comprises the following raw materials in parts by weight: wherein the modified silicon dioxide is a product obtained by grafting carboxymethyl chitosan on hydroxylated silicon dioxide. Specifically, carboxymethyl chitosan is taken as a natural renewable polysaccharide derivative, the molecular chain of the carboxymethyl chitosan can be specifically degraded by chitosan enzymes secreted by microorganisms in soil to generate low molecular weight oligosaccharides or monosaccharides, and the problem of environmental residue of the traditional silane coupling agent modified material is avoided. Meanwhile, the itaconic acid-acrylic acid copolymer can realize the environment-friendly decomposition of the waste materials through the synergistic effect of biodegradation and photooxidation degradation. Further, the polypropylene has a melt index of 20-100g/10min. Further, the molecular weight of the itaconic acid-acrylic acid copolymer is 1000-50000. Further, the heat stabilizer is one or more of a phenolic heat stabilizer, an amine heat stabilizer, a phosphite ester heat stabilizer and a semi-hindered phenolic heat stabilizer. Further, the other auxiliary agent is selected from one or more of repairing agent, dispersing agent, lubricant and nucleating agent. Further, the lubricant is selected from one or more of silicones, amides, polyethylenes, stearates or esters. Further, the repairing agent is selected from one or more of polyethyleneimine, glycerol polyester and polyethylene glycol. The invention also provides a preparation method of the environment-friendly self-repairing polypropylene material, which comprises the following steps: s1, mixing hydroxylated silicon dioxide with carboxymethyl chitosan, and heating for reaction to obtain modified silicon dioxide; S2, uniformly mixing the modified silicon dioxide with other components to obtain the environment-friendly self-repairing polypropylene material. Further, in step S1, the temperature of the heating reaction is 65-85 ℃. Further, in the step S1, the mass ratio of the hydroxylated silicon dioxide to the carboxymethyl chitosan is 1-5:2-5. The invention has the following beneficial effects: the environment-friendly self-repairing polypropylene material is prepared by compounding polypropylene, modified silicon dioxide and itaconic acid-acrylic acid copolymer, wherein the silicon dioxide is subjected to hydroxylation treatment and then reacts with carboxymethyl chitosan, so that the carboxymethyl chitosan is introduced into the modified silicon dioxide; On one hand, as the carboxymethyl chitosan is introduced into the modified silica, the interface characteristic of the silica can be improved, the hydrophobic chain segment in the carboxymethyl chitosan can improve the compatibility between the modified silica and components such as polypropylene, itaconic acid-acrylic acid copolymer and the like, the interfacial tension is obviously reduced, the phenomenon of agglomeration of the modified silica is avoided, a