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Method for coating antireflection film on inner wall and outer wall of outer tube of all-glass vacuum solar energy heat-collecting tube

A solar collector tube, all-glass technology, applied in the field of antireflection coating on the inner and outer walls of the outer tube of an all-glass vacuum solar collector tube, can solve problems such as difficulty in implementation, achieve high uniformity, control film composition and microstructure, and improve chemical uniformity sexual effect

Inactive Publication Date: 2011-01-19
上海圣元新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method of improving the utilization rate of solar energy is generally to improve the solar absorbing coating on the surface of the inner tube of the solar collector tube, and not to improve the antireflection on the surface of the outer tube of the thermal collector tube, mainly because the vacuum method is used to coat the inner and outer surfaces of the outer tube of the thermal collector tube. The anti-reflection coating is difficult to realize in technology, especially on the inner surface of the outer tube

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] 1) SiO2 2 Sol preparation:

[0037] Take tetraethyl orthosilicate, absolute ethanol, deionized water and catalyst with the molar ratio of 1.0:20-40:1.0-2.0:0.01-0.05, and mix ethyl orthosilicate, absolute ethanol, deionized water Mix, then add the catalyst dropwise, the catalyst can be hydrochloric acid or ammonia solution, react with magnetic stirring at 20-60°C for 3-6h, and then age for 3-5 days to obtain SiO 2 Sol spare;

[0038] 2) TiO 2 Sol preparation:

[0039] Using the step-by-step hydrolysis method, take butyl titanate, absolute ethanol, deionized water, and hydrochloric acid with a substance ratio of 1:25-30:4-6:0.75-1, and hydrochloric acid, absolute ethanol, and deionized After the water is mixed, stir vigorously for 15-20 minutes, then dropwise add butyl phthalate solution at a rate of 1-2 drops per second, after the dropwise addition, place it in a sealed container at room temperature and stir for 4-8 hours, then age at room temperature After one day...

Embodiment 1

[0054] (1) Preparation of SiO2 sol

[0055] Add 114ml (0.5mol) of tetraethyl orthosilicate (TEOS), 584ml (10mol) of absolute ethanol, and 9.5ml (0.53mol) of deionized water into the reaction flask in sequence, and then add 0.415ml (0.005mol) of 37% hydrochloric acid As a catalyst, it was stirred under magnetic force for one hour at room temperature to carry out pre-hydrolysis, and then continued to stir at 30°C for two hours, then stood and aged for three days to prepare an acidic SiO2 sol for future use.

[0056] (2) TiO 2 Sol preparation

[0057] Take 730ml (12.5mol) of absolute ethanol (EtOH), 36.5mL (2mol) of deionized water, 31.25mL (0.38mol) of 37% hydrochloric acid (HCl) and stir vigorously for 15min, then add dropwise butyl titanate (Ti (OBu) 4 ) 172.5mL (0.5mol), after the dropwise addition, stir and react in a sealed container at room temperature for 4 hours, and after aging for 1d at room temperature, TiO 2 Sol.

[0058] (3) SiO 2 Sol and TiO 2 sol was pretre...

Embodiment 2

[0063] (1) Preparation of SiO2 sol:

[0064] Add 114ml (0.5mol) of tetraethyl orthosilicate (TEOS), 584ml (10mol) of absolute ethanol, and 9.0ml (0.50mol) of deionized water into the reaction flask in sequence, and then add 0.375ml (0.005mol) of 28% ammonia water As a catalyst, it was stirred by magnetic force for one hour at room temperature to carry out pre-hydrolysis, and then continued to stir for five hours at room temperature and then left to age for five days to obtain basic SiO 2 Sol spare.

[0065] (2) Preparation of TiO2 sol

[0066] Take 730mL (12.5mol) of absolute ethanol (EtOH), 36.5mL (2mol) of deionized water, 31.25mL (0.38mol) of 37% hydrochloric acid (HCl), stir vigorously for 15min after mixing, and then add dropwise butyl titanate ( Ti(OBu) 4 ) 172.5mL (0.5mol), after the dropwise addition, stir and react in a sealed container at room temperature for 4 hours, and after aging for 1d at room temperature, TiO 2 Sol.

[0067] (3) SiO 2 Sol and TiO 2 sol w...

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Abstract

The invention discloses a method for coating an antireflection film on the inner wall and outer wall of the outer tube of an all-glass vacuum solar energy heat-collecting tube, comprising the following steps: 1) preparing SiO2 sol; 2) preparing TiO2 sol; 3) coating a layer of SiO2 film on the outer tube of the solar energy heat-collecting tube by a pulling method; and 4) adopting the same coatingfilm condition and method as in step 3), and continuously coating a layer of TiO2 film on the outer tube processed in step 3). In the invention, a sol-gel method is used to coat the antireflection film on the inner wall and outer wall of the outer tube of the all-glass vacuum solar energy heat-collecting tube, the transmissivity of the outer tube after being coated with the film is improved to 96-98% to ensure that solar energy heat absorbed by the surface of an inner tube can be increased by 6-8%, thus improving the heat gain of the whole all-glass vacuum solar energy heat-collecting tube, so as to achieve the purpose of improving the heat efficiency of the all-glass vacuum solar energy heat-collecting tube.

Description

technical field [0001] The invention relates to a method for coating the inner and outer walls of the outer tube of an all-glass vacuum solar heat collection tube with an anti-reflection film, in particular to a method for coating the inner and outer walls of the outer tube of an all-glass vacuum solar heat collector tube with an anti-reflection film by using a sol-gel method. Background technique [0002] The function of the solar collector tube is to absorb the radiant energy of sunlight and convert it into heat energy, which is one of the core components of solar heat utilization. At present, a kind of solar collector tube produced in large quantities and widely used is an all-glass vacuum solar collector tube (hereinafter referred to as a solar collector tube), which includes an outer glass tube and an inner glass tube, and a solar absorbing coating is coated on the outer surface of the inner tube. , solar radiation passes through the glass outer tube and is absorbed by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/23
Inventor 杜云贵李建光郭廷玮郭祥存
Owner 上海圣元新能源科技有限公司
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