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CN-121975334-A - Heat-resistant polylactic acid-based degradable photo frame material and preparation method thereof

CN121975334ACN 121975334 ACN121975334 ACN 121975334ACN-121975334-A

Abstract

The invention belongs to the technical field of polymer composite materials, and particularly relates to a heat-resistant polylactic acid-based degradable photo frame material and a preparation method thereof. The preparation method comprises the following steps of S1, preparing modified lignin by taking lignin and bromododecane as raw materials, preparing benzene ring-containing polylactic acid by taking the modified lignin and D-lactide as raw materials, and finally carrying out surface grafting treatment on the benzene ring-containing polylactic acid to obtain modified polylactic acid resin, S2, adding the modified polylactic acid resin, polybutylene succinate, talcum powder, an auxiliary agent and an antioxidant into a stirring kettle for heating and stirring to obtain a mixture, and S3, extruding and molding the mixture, and cooling to obtain the heat-resistant polylactic acid-based degradable photo frame material. The invention ensures that the composite material has good heat resistance and obviously improves the impact strength through the synergistic effect of the components.

Inventors

  • YE KANGMIN
  • WU MEIFANG

Assignees

  • 兰溪市壹品阁工艺品有限公司

Dates

Publication Date
20260505
Application Date
20260326

Claims (10)

  1. 1. A preparation method of a heat-resistant polylactic acid-based degradable photo frame material is characterized in that, The method comprises the following steps: S1, preparing modified lignin by taking lignin and bromododecane as raw materials, preparing benzene ring-containing polylactic acid by taking the modified lignin and D-lactide as raw materials, and finally carrying out surface grafting treatment on the benzene ring-containing polylactic acid to obtain modified polylactic acid resin; S2, adding the modified polylactic acid resin, the polybutylene succinate, the talcum powder, the auxiliary agent and the antioxidant into a stirring kettle, and heating and stirring to obtain a mixture; and S3, extruding and molding the mixture, and cooling to obtain the heat-resistant polylactic acid-based degradable photo frame material.
  2. 2. The method for preparing a heat-resistant polylactic acid-based degradable photo frame material according to claim 1, wherein, The step S2 comprises, by weight, 80-90 parts of modified polylactic resin, 20-30 parts of polybutylene succinate, 10-20 parts of talcum powder, 2-4 parts of auxiliary agent and 0.2-0.4 part of antioxidant.
  3. 3. The method for preparing a heat-resistant polylactic acid-based degradable photo frame material according to claim 1, wherein, The preparation method of the modified lignin comprises the steps of uniformly mixing 4-8 parts by weight of bromododecane and 90-100 parts by weight of isopropanol in a high-pressure reaction kettle, adding 4-8 parts by weight of lignin and 0.2-0.4 part by weight of potassium carbonate, heating to 120-130 ℃ and refluxing for 50-60 hours, washing with deionized water, and freeze-drying to obtain the modified lignin.
  4. 4. The method for preparing a heat-resistant polylactic acid-based degradable photo frame material according to claim 1, wherein, The preparation method of the benzene ring-containing polylactic acid comprises the steps of mixing 50-60 parts by weight of D-lactide and 0.2-0.4 part by weight of stannous octoate under the protection of argon, adding 2-4 parts by weight of modified lignin, heating to 100-110 ℃ for reaction for 40-50 hours, washing with methanol, and drying in vacuum to obtain the benzene ring-containing polylactic acid.
  5. 5. The method for preparing a heat-resistant polylactic acid-based degradable photo frame material according to claim 1, wherein, The surface grafting treatment comprises the steps of adding 1.4-1.8 parts by weight of EDC/NHS coupling reagent into 400-500 parts by weight of MES buffer solution, uniformly mixing to obtain mixed solution, adding 8-10 parts by weight of benzene ring-containing polylactic acid into the mixed solution, stirring for 2-4 hours, filtering, washing with water, transferring to 400-500 parts by weight of 10mg/mL chitosan acetic acid solution, stirring for 3-5 hours, carrying out solid-liquid separation, washing solids with deionized water, and drying.
  6. 6. The method for preparing a heat-resistant polylactic acid-based degradable photo frame material according to claim 1, wherein, The talcum powder is silane surface modified carbon doped talcum powder; The preparation method of the silane surface modified carbon-doped talcum powder comprises the steps of preparing carbon-doped talcum powder by taking carboxylated double-wall carbon nanotubes and talcum powder as raw materials, and then carrying out surface modification treatment on the carbon-doped talcum powder by using a silane coupling agent to obtain the silane surface modified carbon-doped talcum powder.
  7. 7. The method for preparing a heat-resistant polylactic acid-based degradable photo frame material according to claim 6, wherein, The preparation method of the carbon-doped talcum powder comprises the steps of adding 0.2-0.4 part by weight of sodium dodecyl benzene sulfonate into 90-100 parts by weight of deionized water, uniformly mixing, adding 1-3 parts by weight of carboxylated double-wall carbon nano tubes, performing ultrasonic dispersion for 50-60 min, adding 8-10 parts by weight of talcum powder, stirring for 60-80 min at a speed of 1000-1200 rpm, performing suction filtration, washing with deionized water, and performing freeze drying to obtain the carbon-doped talcum powder.
  8. 8. The method for preparing a heat-resistant polylactic acid-based degradable photo frame material according to claim 6, wherein, The surface modification treatment comprises the steps of adding 2-4 parts by weight of a silane coupling agent into a mixed solution of 80-90 parts by weight of deionized water and 10-20 parts by weight of absolute ethyl alcohol, adjusting the pH to 5-6, adding 8-10 parts by weight of carbon-doped talcum powder, stirring at 70-80 ℃ for surface modification for 2-4 hours, filtering, washing with absolute ethyl alcohol, and drying.
  9. 9. The method for preparing a heat-resistant polylactic acid-based degradable photo frame material according to claim 6, wherein, The silane coupling agent is gamma-glycidol ether oxypropyl trimethoxy silane.
  10. 10. A heat-resistant polylactic acid-based degradable photo frame material, characterized in that the material is prepared by the preparation method according to any one of claims 1-9.

Description

Heat-resistant polylactic acid-based degradable photo frame material and preparation method thereof Technical Field The invention belongs to the technical field of polymer composite materials, and particularly relates to a heat-resistant polylactic acid-based degradable photo frame material and a preparation method thereof. Background The photo frame is similar to a square, the inside of the photo frame is fastened to be empty, and a common photo is just placed in a blank, so that the photo frame is mainly used for positioning four sides of the photo and enhancing the attractiveness of the photo frame, is beneficial to protecting the quality of the photo, and can prevent the photo from changing color, yellowing and the like. The novel photo frame is mainly characterized by comprising (1) no softening and deformation of indoor and window edges due to sun exposure, (2) no easy breakage due to falling, (3) fine and smooth and matte surface, printing and gold stamping, and (4) environmental protection and degradability, and is suitable for literature, gifts and decorative photo frames. The main stream photo frame materials in the market are wood photo frames, glass photo frames, metal photo frames, plastic photo frames and the like, wherein the plastic photo frames have the characteristics of light materials, rich colors, various shapes, low price, difficult breaking, convenient carrying and the like. Polylactic acid is a bio-based degradable polymer material prepared from renewable biomass resources through processes such as fermentation, polymerization and the like, can be completely decomposed into water and carbon dioxide by microorganisms under proper conditions, does not cause long-term pollution to the environment, has high transparency and high glossiness, and is good in finished product light transmittance, good in heat stability and capable of being processed in various modes such as injection molding, film blowing, extrusion and the like, and is increasingly used in creative home and living goods due to good comprehensive performance. The invention discloses a plastic-wood composite photo frame which is prepared from the following raw materials, by mass, 100 parts of polyvinyl chloride plastic particles, 45 parts of wood powder, 24-30 parts of attapulgite clay with an average particle size of 30-50 mu m, 1-1.2 parts of mesoporous molecular sieve, 5-8 parts of chlorinated polyethylene, 1-2 parts of foaming agent, 1.8-2 parts of lead salt heat stabilizer, 3.2-4 parts of metal soap heat stabilizer and 1.2 parts of epoxy plasticizer. The main material of the photo frame in the patent technology is polyvinyl chloride plastic, the degradation performance is poor, and meanwhile, the heat resistance is further improved. Therefore, how to use polylactic acid as a main raw material, and prepare the lactic acid-based photo frame material by modifying and introducing functional components, so that the material has good high temperature resistance, can realize a degradable target, and becomes a direction needing important research. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a heat-resistant polylactic acid-based degradable photo frame material and a preparation method thereof; according to the invention, lignin and bromododecane are used as raw materials to prepare modified lignin, then the modified lignin and D-lactide are used as raw materials to prepare benzene ring-containing polylactic acid, the benzene ring-containing polylactic acid is subjected to surface grafting treatment to obtain modified polylactic acid resin, and the modified polylactic acid resin is mixed with polybutylene succinate, talcum powder, auxiliary agent, antioxidant and other components to be extruded and molded, so that the polylactic acid-based degradable photo frame material is prepared, and through the synergistic effect of the components, the composite material is ensured to have good heat resistance and the impact strength is obviously improved. In a first aspect of the present invention, there is provided a method for preparing a heat resistant polylactic acid based degradable photo frame material, comprising the steps of: S1, preparing modified lignin by taking lignin and bromododecane as raw materials, preparing benzene ring-containing polylactic acid by taking the modified lignin and D-lactide as raw materials, and finally carrying out surface grafting treatment on the benzene ring-containing polylactic acid to obtain modified polylactic acid resin; S2, adding the modified polylactic acid resin, the polybutylene succinate, the talcum powder, the auxiliary agent and the antioxidant into a stirring kettle, and heating and stirring to obtain a mixture; and S3, extruding and molding the mixture, and cooling to obtain the heat-resistant polylactic acid-based degradable photo frame material. As a preferable technical scheme of the invention, the temperature rising and stirring condit