Method for preparing uvioresistant polyester by nanometer titania in situ

A technology of nano-titanium dioxide and nano-titanium oxide, applied in the preparation of polyester, using nano-titanium dioxide in situ to prepare anti-ultraviolet radiation polyester, which can solve the problems of low material strength, breathability, poor durability and temperature resistance Poor performance and other problems, to achieve the effect of reducing catalytic activity, improving aging resistance, and improving hue

Inactive Publication Date: 2004-12-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention firstly abandons organic ultraviolet absorbers, but adopts inorganic nano-ultraviolet shielding agents, which completely overcomes the problems of agglomeration and uneven dispersion of ultraviolet absorbers in polymers and low streng...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In a 5000mL glass reactor with a circulating water jacket, add 2500mL of a 0.2mol L sodium silicate aqueous solution (according to SiO 2 :TiO 2 =10%, mass percent), then add 500mL of deionized water and 30 grams of sodium hexametaphosphate, heat and stir for 30 minutes, after the sodium hexametaphosphate is completely dissolved, add 300 grams of rutile nano-oxidizer with an average particle diameter of 10 nanometers Titanium, use 1mol L sodium hydroxide aqueous solution to adjust the pH value of the solution to 9.5 ± 1, heat up and stir, and when the temperature rises to 85°C, start to continuously drop the sulfuric acid aqueous solution (mass percentage) with a concentration of 10%. Maintain the pH value of reaction solution to be 9.5 ± 1 all the time, after 45 minutes, stop dripping sulfuric acid, add after 50 grams of analytical pure aluminum sulfates in reaction solution after insulation aging 5 hours (according to Al 2 o 3 :TiO 2 =5%, mass percentage), the solut...

Embodiment 2

[0027] According to the method described in Example 1, the difference is that the surface of nano-titanium oxide is coated with silicon by SiO 2 :TiO 2 =5%, mass percentage, aluminum clad according to Al 2 o 3 :TiO 2=3%, mass percent, the amount of polyvinylpyrrolidone is 15% of the amount of nano-titanium oxide.

[0028] According to the nano-titanium oxide / polyester composite material prepared by the method described in Example 1, the hue L value of the resin is 80.10, the hue b value is 6.07, the intrinsic viscosity is 0.660, the melting point is 260.1 ° C, and the carboxyl content is 20mol.t -1 , Diethylene glycol content is 0.8%.

[0029] After drying the above-mentioned nano-titanium oxide / polyester composite resin in a vacuum oven at 150° C. for 48 hours, spinning, drawing, and manufacturing, the ultraviolet shielding index UPF value of plain weave cloth with a thickness of 50 microns is 50.

[0030] With above-mentioned nano-titanium oxide / polyester composite mate...

Embodiment 3

[0032] According to the method described in Example 1, the difference is that the surface of nano-titanium oxide is coated with silicon by SiO 2 :TiO 2 =8%, mass percentage, aluminum clad according to Al 2 o 3 :TiO 2 =8%, mass percent.

[0033] According to the nano-titanium oxide / polyester composite material prepared by the method described in Example 1, the hue L value of the resin is 81.65, the hue b value is 5.66, the intrinsic viscosity is 0.659, the melting point is 262.7 ° C, and the carboxyl content is 19mol.t -1 , Diethylene glycol content is 1.1%.

[0034] After drying the above-mentioned nano-titanium oxide / polyester composite resin in a vacuum oven at 150° C. for 48 hours, spinning, drawing, and manufacturing, the ultraviolet shielding index UPF value of plain weave cloth with a thickness of 50 microns is 50.

[0035] With above-mentioned nano-titanium oxide / polyester composite material resin in vacuum oven, 150 ℃ of drying after 6 hours, carry out drawing fil...

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Abstract

A process for in-situ preparing UV-resistant polyester by use of TiO2 nanoparticles includes such steps as modifying the surface of TiO2 nanoparticle as UV shielding agent, dispersing them in diol, high-speed stirring, cyclic sand grinding, and polymerizing (or copolymerizing) with polyester and other monomer. Its advantage is high UV shielding effect.

Description

technical field [0001] The invention relates to a method for preparing polyester, in particular to a method for preparing anti-ultraviolet radiation polyester in situ by using nano-titanium dioxide. It belongs to the field of composite materials. technical background [0002] In recent years, due to factors such as intensified destruction of forest vegetation, frequent sunspot activities, and extensive use of freon refrigerants, human beings are facing increasing ultraviolet radiation. Ultraviolet rays are divided into UVC (200-280nm), UVB (280-320nm), UVA (320 ~ 400nm) three regions. UVC is absorbed by the ozone layer and has basically no damage to the human body. UVB can be absorbed by the dermis of the skin, and long-term exposure will cause erythema, inflammation, skin aging, and in severe cases, it will cause skin cancer. The penetration of UVA is much deeper than that of UVB, which can make the skin dark, and long-term accumulation will lead to skin aging. At the s...

Claims

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Application Information

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IPC IPC(8): C08G63/78C08K3/22C08L67/00
Inventor 徐宏程存康林嵩古宏晨吴亚妮
Owner SHANGHAI JIAO TONG UNIV
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