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CN-122011711-A - Biodegradable polyester composite material containing tannic acid-aluminum coordination modified bamboo fibers

CN122011711ACN 122011711 ACN122011711 ACN 122011711ACN-122011711-A

Abstract

The invention provides a biodegradable polyester composite material containing tannic acid-aluminum coordination modified bamboo fibers, and relates to the technical field of composite materials. The biodegradable polyester composite material containing tannic acid-aluminum coordination modified bamboo fiber comprises, by weight, 100 parts of biodegradable polyester, 1-30 parts of modified bamboo fiber and 0.3-2 parts of compatilizer, wherein the modified bamboo fiber is tannic acid-aluminum coordination modified bamboo fiber, and the compatilizer is polyester polyurethane with side chains chemically bonded with epoxy groups. The invention adds the modified bamboo fiber and the compatilizer into the biodegradable polyester, thus obtaining the biodegradable polyester composite material with better mechanical property.

Inventors

  • HU JUNXIA
  • JIN SONGHENG
  • ZHANG JIAN
  • CUI LIYUN
  • SHAN YINGYING
  • WANG ZHONGXU

Assignees

  • 浙江农林大学

Dates

Publication Date
20260512
Application Date
20260326

Claims (10)

  1. 1. A biodegradable polyester composite material containing tannic acid-aluminum coordination modified bamboo fiber is characterized by comprising, by weight, 100 parts of biodegradable polyester, 1-30 parts of modified bamboo fiber and 0.3-2 parts of compatilizer; the modified bamboo fiber is tannic acid-aluminum coordination modified bamboo fiber; The compatilizer is polyester polyurethane with side chains chemically bonded with epoxy groups.
  2. 2. The biodegradable polyester composite according to claim 1, characterized in that said biodegradable polyester is selected from one or more of polylactic acid, polycaprolactone, polybutylene succinate, polybutylene adipate, polybutylene terephthalate and polybutylene succinate-adipate.
  3. 3. The biodegradable polyester composite material according to claim 1, wherein the modified bamboo fiber is prepared by impregnating bamboo fiber with tannic acid, then with carbonate, and finally with an aluminium salt, and reacting.
  4. 4. The biodegradable polyester composite according to claim 3, characterized in that said impregnation infiltration is performed by vacuum impregnation, pressure impregnation or atmospheric impregnation; The soaking time of the vacuum soaking method and the pressure soaking method is independently 0.5-2h; The impregnation time of the normal pressure impregnation method is 6-24 hours.
  5. 5. The biodegradable polyester composite according to claim 3, characterized in that said impregnated tannic acid is an aqueous tannic acid solution having a concentration of 1-5% by weight; the stain penetration carbonate is carbonate aqueous solution with the concentration of 0.5-5 wt%; The impregnating penetration aluminum salt is an aqueous aluminum salt solution with the concentration of 1-5 wt%.
  6. 6. The biodegradable polyester composite according to claim 3, characterized in that said carbonate is selected from one or both of sodium carbonate and potassium carbonate; the aluminum salt is selected from one or more of aluminum chloride, aluminum nitrate, aluminum sulfate, aluminum acetylacetonate and aluminum isopropoxide.
  7. 7. The biodegradable polyester composite according to claim 1, characterized in that said compatibilizing agent is prepared by the process of: mixing diisocyanate monomer and polyester diol and then reacting to obtain prepolymer with NCO group as end group; The prepolymer adopts a chain extender to carry out chain extension reaction to obtain the compatilizer; The chain extender contains a dihydroxyepoxy compound, and the weight ratio of the dihydroxyepoxy compound in the chain extender is not less than 30%.
  8. 8. The biodegradable polyester composite according to claim 7, characterized in that said diisocyanate monomer is selected from one or more of IPDI, HMDI, TDI, HDI, MDI and XDI; The number average molecular weight of the polyester diol is 600-2000g/mol.
  9. 9. The biodegradable polyester composite according to claim 7, characterized in that the NCO group content in the prepolymer is not less than 7wt%; The molar ratio of NCO groups in the prepolymer to OH groups in the chain extender is 1:1.1-1.8.
  10. 10. The biodegradable polyester composite according to claim 7, characterized in that said dihydroxyepoxy compound contains 2 hydroxyl groups and at least 1 epoxy group; the dihydroxyepoxy compound is selected from one or more of pentaerythritol diglycidyl ether, dipentaerythritol tetraglycidyl ether, glycerol monoglycidyl ether and trimethylol monoglycidyl ether.

Description

Biodegradable polyester composite material containing tannic acid-aluminum coordination modified bamboo fibers Technical Field The invention belongs to the technical field of composite materials, and relates to a biodegradable polyester composite material containing tannic acid-aluminum coordination modified bamboo fibers. Background Biodegradable polyesters such as polylactic acid and polycaprolactone have wide application prospects, but have the defects of insufficient mechanical strength, insufficient impact resistance and the like. Bamboo fibers are widely available, low in cost and high in specific strength, and have been reported for reinforcement of biodegradable polyesters. However, the surface of the bamboo fiber contains a large amount of hydroxyl groups, so that the bamboo fiber has strong agglomeration force, is not easy to disperse, has poor compatibility with biodegradable polyester, has strong hygroscopicity, and is easy to cause the hydrolysis of ester groups of the biodegradable polyester after moisture absorption. Therefore, it is necessary to modify the bamboo fibers to increase the hydrophobicity and compatibility with biodegradable polyesters. Chinese patent CN121537764a discloses a degradable polyester composite material of bamboo fiber ultra-nanometer micropowder melt blending, which adopts a pre-dispersed interface grafted bamboo fiber master batch, the pre-dispersed interface grafted bamboo fiber master batch comprises a tannic acid coordination modified layer with metal ions on the surface and a micro-nano bamboo fiber of a chemical grafted polymer layer. However, the preparation method of the pre-dispersion interface grafted bamboo fiber master batch is complex, and coordination crosslinking modification of metal ions and tannic acid is needed to be combined for chemical grafting of polymers. Therefore, the existing bamboo fiber modification technology needs to be further optimized to improve the reinforcing effect on the biodegradable polyester. Disclosure of Invention In order to solve the technical problems, the invention provides a biodegradable polyester composite material containing tannic acid-aluminum coordination modified bamboo fibers. The technical scheme of the invention is as follows: the biodegradable polyester composite material containing tannic acid-aluminum coordination modified bamboo fiber comprises, by weight, 100 parts of biodegradable polyester, 1-30 parts of modified bamboo fiber and 0.3-2 parts of compatilizer; the modified bamboo fiber is tannic acid-aluminum coordination modified bamboo fiber; The compatilizer is polyester polyurethane with side chains chemically bonded with epoxy groups. Preferably, the biodegradable polyester is selected from one or more of polylactic acid, polycaprolactone, polybutylene succinate, polybutylene adipate, polybutylene terephthalate adipate, and polybutylene succinate-adipate. Preferably, the preparation method of the modified bamboo fiber comprises the steps of impregnating the bamboo fiber with tannic acid, impregnating with carbonate, impregnating with aluminium salt, and reacting to obtain the modified bamboo fiber. More preferably, the impregnation and infiltration is performed by vacuum impregnation, pressurized impregnation or atmospheric impregnation; The soaking time of the vacuum soaking method and the pressure soaking method is independently 0.5-2h; The impregnation time of the normal pressure impregnation method is 6-24 hours. More preferably, the impregnated tannic acid is an aqueous tannic acid solution with a concentration of 1-5 wt%; the stain penetration carbonate is carbonate aqueous solution with the concentration of 0.5-5 wt%; The impregnating penetration aluminum salt is an aqueous aluminum salt solution with the concentration of 1-5 wt%. More preferably, the carbonate is selected from one or both of sodium carbonate and potassium carbonate; the aluminum salt is selected from one or more of aluminum chloride, aluminum nitrate, aluminum sulfate, aluminum acetylacetonate and aluminum isopropoxide. Preferably, the preparation method of the compatilizer comprises the following steps: mixing diisocyanate monomer and polyester diol and then reacting to obtain prepolymer with NCO group as end group; The prepolymer adopts a chain extender to carry out chain extension reaction to obtain the compatilizer; The chain extender contains a dihydroxyepoxy compound, and the weight ratio of the dihydroxyepoxy compound in the chain extender is not less than 30%. More preferably, the diisocyanate monomer is selected from one or more of IPDI, HMDI, TDI, HDI, MDI and XDI; The number average molecular weight of the polyester diol is 600-2000g/mol. More preferably, the content of NCO groups in the prepolymer is not less than 7% by weight; The molar ratio of NCO groups in the prepolymer to OH groups in the chain extender is 1:1.1-1.8. More preferably, the dihydroxyepoxy compound contains 2 hydroxyl groups and at least 1 epoxy