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CN-117702465-B - Sisal fiber-based ultraviolet absorber, preparation method and wood-plastic composite material

CN117702465BCN 117702465 BCN117702465 BCN 117702465BCN-117702465-B

Abstract

The invention discloses a sisal fiber-based ultraviolet absorber, a preparation method and a wood-plastic composite material. The preparation method of the sisal fiber-based ultraviolet absorber comprises the steps of S1, carboxylating sisal fibers, S2, amination, and S3, grafting the carboxylated sisal fibers with the ultraviolet absorber to obtain the sisal fiber-based ultraviolet absorber. The wood-plastic composite material is formed by compounding sisal fiber based ultraviolet absorbent and high polymer material. The invention adopts normal temperature acidification and microwave rapid synthesis, uses water as a dispersion medium, does not use an organic solvent, has mild conditions, is easy to purify and is easy to industrialize. The ultraviolet absorber matrix 2, 4-dihydroxybenzophenone (UV-0) is bonded to sisal fibers, is applied to the wood-plastic composite material, has good dispersibility, is not easy to migrate, and can improve the ultraviolet aging resistance of the wood-plastic composite material.

Inventors

  • YU SHUJUAN
  • JI JIAWEI
  • LI QILONG

Assignees

  • 宿迁学院

Dates

Publication Date
20260512
Application Date
20231214

Claims (7)

  1. 1. A method for preparing sisal fiber-based ultraviolet light absorber, comprising: S1, carboxylation treatment is carried out on sisal fibers; s2, performing amination treatment on carboxylated sisal fibers; S3, grafting an ultraviolet absorber on the aminated sisal fiber to obtain a sisal fiber-based ultraviolet absorber; in the S1, the method of performing a carboxylation treatment on the sisal fibers includes: Adding sisal fiber into a mixed solution composed of TEMPO, sodium bromide, sodium hypochlorite and water, regulating the pH to 8-11, reacting for 1-4h at room temperature, washing and drying after the reaction is finished to obtain carboxylated sisal fiber; in the S2, the method of performing an amination treatment on carboxylated sisal fibers comprises: Dispersing carboxylated sisal fibers and polyethyleneimine or 2, 5-diaminobenzenesulfonic acid or L-arginine in water, and reacting under microwave conditions to obtain aminated sisal fibers; in the S3, the method for grafting the ultraviolet absorbent on the aminated sisal fiber comprises the following steps: mixing paraformaldehyde with water, regulating pH to 3-5, sequentially adding methanol or ethanol solution of 2, 4-dihydroxybenzophenone and aminated sisal fiber, and reacting under microwave condition to obtain sisal fiber-based ultraviolet absorbent.
  2. 2. The method for preparing a sisal fiber-based ultraviolet light absorber according to claim 1, wherein the mass ratio of carboxylated sisal fibers to polyethyleneimine is 1:0.1-1.
  3. 3. The method for preparing sisal fiber-based ultraviolet light absorber according to claim 1, wherein the reaction is performed at 90-100 ℃ and power of 500-600W for 30-50min in S2.
  4. 4. The method for preparing sisal fiber-based ultraviolet light absorber according to claim 1, wherein in S3, the reaction is performed at 50-70 ℃ and a power of 500-600W.
  5. 5. The method for preparing sisal fiber-based ultraviolet light absorber according to claim 1, wherein a mass ratio of the aminated sisal fiber to the 2, 4-dihydroxybenzophenone is 1:0.05-0.6.
  6. 6. Sisal fiber-based ultraviolet light absorber, characterized in that it is prepared by the preparation method according to any one of claims 1 to 5.
  7. 7. The ultraviolet aging resistant wood-plastic composite material is characterized by being formed by compounding the sisal fiber-based ultraviolet absorber described in claim 6 with a high polymer material.

Description

Sisal fiber-based ultraviolet absorber, preparation method and wood-plastic composite material Technical Field The present invention relates to the field of materials. More particularly, the invention relates to a sisal fiber-based ultraviolet absorber, a preparation method and application thereof. Background In recent years, with the continuous cavitation of the ozone layer in the earth's atmosphere, the intensity of ultraviolet radiation on the ground has been increasing, which has a very adverse effect on humans and their living environment. In addition, the high polymer material can accelerate the photo-oxidative aging of the material after being irradiated by ultraviolet light for a long time, thereby shortening the service life of the material. In order to reduce the aging phenomenon of the polymer material caused by the ultraviolet light, the addition of an ultraviolet absorber to the polymer material is an effective method. The sisal fiber has high strength and corrosion resistance, has a wider application range, can be used as a wood-plastic composite material, is used for wood-plastic floors, outdoor fences and the like, is compounded with a high polymer material such as PE, PP, PVC to prepare the wood-plastic composite material, and is easy to age after being exposed to ultraviolet light for a long time, so that the service life of the wood-plastic composite material is shortened. At present, the ultraviolet light aging prevention of the common wood-plastic composite material is to add a low molecular weight or macromolecular organic ultraviolet light absorber, wherein the low molecular ultraviolet light absorber is easy to decompose during the thermal processing in the preparation process, is unevenly dispersed in a macromolecular matrix, and is easy to migrate in the later use process of the composite material, thereby influencing the ultraviolet aging resistance of the material. Therefore, there is a need to design a solution that overcomes the above drawbacks. Disclosure of Invention An object of the present invention is to provide a sisal fiber-based ultraviolet absorber, a preparation method thereof and a wood-plastic composite material, wherein the sisal fiber-based ultraviolet absorber can be used for improving ultraviolet aging resistance of the wood-plastic composite material. To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, there is provided a method for preparing a sisal fiber-based ultraviolet light absorber, comprising S1, carboxylating sisal fibers, S2, aminating the carboxylated sisal fibers, and S3, grafting the aminated sisal fibers with an ultraviolet light absorber to obtain the sisal fiber-based ultraviolet light absorber. Further, in the step S1, the method for performing carboxylation treatment on the sisal fibers comprises the steps of adding the sisal fibers into a mixed solution composed of TEMPO, sodium bromide, sodium hypochlorite and water, adjusting the pH to 8-11, reacting at room temperature for 1-4h, washing and drying after the reaction is finished to obtain carboxylated sisal fibers. Further, in the step S2, the method for performing amination treatment on carboxylated sisal fibers comprises dispersing carboxylated sisal fibers and polyethylenimine, 2, 5-diaminobenzenesulfonic acid or L-arginine in water, and reacting under microwave conditions to obtain the aminated sisal fibers. Further, the mass ratio of carboxylated sisal fibers to polyethyleneimine is 1:0.1-1. Further, the reaction is carried out for 30-50min at 90-100 ℃ and the power of 500-600W. Further, in the step S3, the method for grafting the ultraviolet absorbent on the aminated sisal fibers comprises the steps of mixing paraformaldehyde with water, adjusting the pH to 3-5, sequentially adding a methanol or ethanol solution of 2, 4-dihydroxybenzophenone and the aminated sisal fibers, and reacting under a microwave condition to obtain the sisal fiber-based ultraviolet absorbent. Further, the reaction is carried out at 50-70 ℃ and a power of 500-600W. Further, the mass ratio of the aminated sisal fiber to the 2, 4-dihydroxybenzophenone is 1:0.05-0.6. According to another aspect of the present invention, there is also provided a sisal fiber-based ultraviolet light absorber, prepared by the preparation method. According to another aspect of the invention, the invention also provides an ultraviolet aging resistant wood-plastic composite material which is formed by compounding the sisal fiber-based ultraviolet absorber and a high polymer material. The invention at least comprises the following beneficial effects: according to the invention, carboxylation treatment and amination treatment are sequentially carried out on sisal fibers, and then an ultraviolet absorber is grafted to obtain the sisal fiber-based ultraviolet absorber, so that the preparation process is environment-friendly, low in energy consumption, eas