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Preparation method of bio-based flame-retardant and light-aging-resistant PVA (Polyvinyl Alcohol) composite material

A composite material, anti-light aging technology, applied in the field of composite materials, can solve the problem of reducing the performance of polymer materials

Active Publication Date: 2021-07-30
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Common UV absorbers such as TiO 2 , ZnS, etc. will produce strong oxidizing holes and strong reducing photogenerated electrons after absorbing ultraviolet rays. Free radicals, which reduce the performance of polymer materials and eventually lead to their decomposition

Method used

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  • Preparation method of bio-based flame-retardant and light-aging-resistant PVA (Polyvinyl Alcohol) composite material
  • Preparation method of bio-based flame-retardant and light-aging-resistant PVA (Polyvinyl Alcohol) composite material
  • Preparation method of bio-based flame-retardant and light-aging-resistant PVA (Polyvinyl Alcohol) composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Disperse 2 g of polyvinyl alcohol with a degree of polymerization of 1750 in 100 mL of deionized water, raise the temperature to 80 ° C, stir for 1 h, and naturally cool to room temperature to obtain a PVA dispersion; add 0.5 mL of glacial acetic acid and 0.1 g of PVA dispersion to 100 mL of PVA dispersion Chitosan powder was stirred at room temperature for 2 hours until the chitosan powder was completely dissolved to obtain a mixed solution; 0.25 g of phytic acid was added to the mixed solution, stirred at room temperature for 1 hour, and then ultrasonicated for 1 hour to obtain a bio-based flame-retardant PVA solution ; Add phosphor powder excited in the 200nm to 400nm band to the bio-based flame-retardant PVA solution, the quality of the added phosphor is 3% of the bio-based flame-retardant PVA solution and the phosphor powder, stir at room temperature for 4 hours, and then sonicate for 1 hour , to obtain a mixed solution; the mixed solution was transferred to a mold ...

Embodiment 2

[0037] Disperse 5 g of polyvinyl alcohol with a degree of polymerization of 1750 in 250 mL of deionized water, raise the temperature to 95 ° C, stir for 3 hours, and naturally cool to room temperature to obtain a PVA dispersion; add 2 mL of glacial acetic acid and 1 g of chitosan to 250 mL of the PVA dispersion Sugar powder was stirred at room temperature for 4 hours until the chitosan powder was completely dissolved to obtain a mixed solution; 8 g of phytic acid was added to the mixed solution, stirred at room temperature for 2 hours, and then ultrasonicated for 4 hours to obtain a bio-based flame-retardant PVA solution; The bio-based flame-retardant PVA solution is added with fluorescent powder that is excited in the 200nm-400nm band, the quality of the added phosphor is 5% of the total mass of the bio-based flame-retardant PVA solution and the phosphor powder, stirred at room temperature for 6 hours, and then ultrasonicated for 2 hours. A mixed solution was obtained; the mix...

Embodiment 3

[0039] Disperse 3.5g of polyvinyl alcohol with a degree of polymerization of 1750 in 175mL of deionized water, raise the temperature to 87.5°C, stir for 2 hours, and naturally cool to room temperature to obtain a PVA dispersion; add 1.25mL of glacial acetic acid and 0.55 g chitosan powder, stirred at room temperature for 3 hours until the chitosan powder was completely dissolved to obtain a mixed solution; 4.125 g of phytic acid was added to the mixed solution, stirred at room temperature for 1.5 hours, and then ultrasonicated for 2.5 hours to obtain a biobased barrier solution. Burn the PVA solution; add phosphor powder that is excited in the 200nm to 400nm band to the bio-based flame-retardant PVA solution, the quality of the added phosphor is 4% of the total mass of the bio-based flame-retardant PVA and the phosphor powder, and stir at room temperature for 5 hours , and then sonicated for 1.5 hours to obtain a mixed solution; the mixed solution was transferred to a mold and ...

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Abstract

The invention discloses a preparation method of a bio-based flame-retardant and light-aging-resistant PVA (polyvinyl alcohol) composite material, which comprises the following steps: dispersing polyvinyl alcohol in deionized water, heating, stirring and cooling to obtain PVA dispersion liquid; adding glacial acetic acid and chitosan powder, and stirring at room temperature until the chitosan powder is completely dissolved; adding phytic acid, stirring and performing ultrasonic treatment to obtain a bio-based flame-retardant PVA solution; adding fluorescent powder, stirring at room temperature, and performing ultrasonic treatment to obtain a mixed solution; and transferring the mixed solution into a mold, drying, and demolding to obtain the bio-based flame-retardant and light-aging-resistant PVA composite material. The composite material prepared by the preparation method has excellent flame retardant property, mechanical property, ultraviolet absorption property and the like, the influence of ultraviolet on PVA (Polyvinyl Alcohol) can be reduced, the service life is prolonged, and the light aging resistance is improved.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to a flame-retardant composite material, in particular to a preparation method of a bio-based flame-retardant and anti-light aging PVA composite material. Background technique [0002] Resin-based composite materials such as polyvinyl alcohol (PVA) have the characteristics of high specific strength, low density, fatigue resistance, shock absorption, and chemical corrosion resistance, and are widely used in various industries and people's daily life. However, its flammability also leads to the potential hidden danger of fire, which always threatens people's life safety. For this reason, the way of adding flame retardants is usually used to reduce the flammability of PVA and improve its safety in use. However, adding a large amount of flame retardant will have a great impact on the mechanical properties of the material and its inherent excellent performance. On the other h...

Claims

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Application Information

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IPC IPC(8): C09D129/04C09D105/08C09D5/22C09D5/18C08B37/08
CPCC09D129/04C09D5/22C09D5/18C08B37/003C08L2201/02C08L2201/08C08L5/08C08K3/34
Inventor 王育华张志豪宁浩哲
Owner LANZHOU UNIVERSITY
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