A high-strength anti-yellowing polyurethane lamp cover and its preparation method

A technology of anti-yellowing and polyurethane, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as brittleness, affecting the normal use of floor lamps, discoloration, etc., and achieve the effect of improving coating performance

Active Publication Date: 2022-03-29
SHANGHAI HECHENG POLYMER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some existing floor lamp parts use PU products. Because the floor lamp is exposed on the ground, it is under the pressure of pedestrians passing by for a long time, and it is prone to discoloration and brittleness under sunlight, which seriously affects the normal use of the floor lamp.

Method used

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  • A high-strength anti-yellowing polyurethane lamp cover and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Prepare the shell:

[0035] Mix hydroxymethylated lignin and distilled water, add sodium hydroxide solution, adjust the pH of the system to 10.5, and raise the temperature to 88°C to obtain a lignin solution; mix cardanol and distilled water, add sodium hydroxide solution, and adjust the pH of the system to 10.5, the temperature was raised to 88° C. to obtain a cardanol solution;

[0036] Mix the lignin solution and the cardanol solution, reflux at 88°C for 100min, add distilled water and hydrochloric acid, adjust the pH of the system to 2.7, precipitate out, let it stand for 2h, filter, wash with distilled water repeatedly until neutral, and vacuum dry at 50°C for 12h to obtain Modified lignin; the consumption of cardanol is 5.0% of lignin quality;

[0037] Take polytetrahydrofuran ether diol for vacuum dehydration at 100°C, cool to 40°C, add toluene diisocyanate, stir in a nitrogen atmosphere, react at 68°C for 1 hour, cool down and vacuum defoam to obtain a prep...

Embodiment 2

[0044] (1) Prepare the shell:

[0045] Mix hydroxymethylated lignin and distilled water, add sodium hydroxide solution, adjust the pH of the system to 11, and raise the temperature to 90°C to obtain a lignin solution; mix cardanol and distilled water, add sodium hydroxide solution, and adjust the pH of the system to 11. Heat up to 90°C to obtain a cardanol solution;

[0046] Mix the lignin solution with the cardanol solution, reflux at 90°C for 120min, add distilled water and hydrochloric acid, adjust the pH of the system to 3.0, precipitate out, let stand for 2.5h, filter, wash with distilled water repeatedly until neutral, and vacuum dry at 60°C for 18h. Obtain modified lignin; the amount of cardanol is 8.5% of lignin quality;

[0047] Take polytetrahydrofuran ether diol for vacuum dehydration at 110°C, cool to 50°C, add toluene diisocyanate, stir in a nitrogen atmosphere, react at 70°C for 1.5h, cool down and vacuum defoam to obtain a prepolymer; add 4,4' -Dithiodiphenyla...

Embodiment 3

[0054] (1) Prepare the shell:

[0055] Mix hydroxymethylated lignin and distilled water, add sodium hydroxide solution, adjust the pH of the system to 11.5, and raise the temperature to 95°C to obtain a lignin solution; mix cardanol and distilled water, add sodium hydroxide solution, and adjust the pH of the system to 11.5, the temperature was raised to 95° C. to obtain a cardanol solution;

[0056] Mix the lignin solution and the cardanol solution, reflux at 95°C for 150min, add distilled water and hydrochloric acid, adjust the pH of the system to 3.2, precipitate out, let stand for 3h, filter, wash with distilled water repeatedly until neutral, and vacuum dry at 70°C for 24h to obtain Modified lignin; the consumption of cardanol is 12% of lignin quality;

[0057] Take polytetrahydrofuran ether diol for vacuum dehydration at 120°C, cool to 60°C, add toluene diisocyanate, stir in a nitrogen atmosphere, react at 75°C for 2 hours, cool down and vacuum defoam to obtain a prepoly...

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Abstract

The invention discloses a high-strength anti-yellowing polyurethane lamp cover and a preparation method thereof, comprising the following steps: (1) preparing a shell: taking polytetrahydrofuran ether glycol, toluene diisocyanate, 4,4'-dithio Diphenylamine, isophorone diamine, modified lignin mixed reaction, obtain shell; (2) get aliphatic polyester polyol, copolymer, trimerization catalyst, hexamethylene diisocyanate and mix, add resin, Coating on the surface of the shell, curing to obtain the coating, and making the lamp cover. The invention sets the shell and the coating structure, and through the setting of the centering component and its preparation process, the cardanol is used to modify the lignin, and the polyurethane component is adjusted to enhance the mechanical properties and anti-ultraviolet properties of the shell. The resin and copolymer are introduced into the acrylic polyurethane coating system to improve the coating performance and obtain a high-strength anti-yellowing ground lamp cover.

Description

technical field [0001] The invention relates to the technical field of lamp covers, in particular to a high-strength yellowing-resistant polyurethane lamp cover and a preparation method thereof. Background technique [0002] With the continuous improvement of people's living standards, people pay more and more attention to the beauty of natural and living environments, and often add light sources at night to supplement lighting and decorate. Ground lamps are lighting facilities embedded on the ground, also known as buried lamps and Tibetan grounds. They are used to illuminate the ground and vegetation on the ground, improve the aesthetics of cultural facilities and natural landscapes, and improve the safety of pedestrians. sex. Some existing floor lamp parts use PU products. Because the floor lamp is exposed on the ground, it is under the pressure of pedestrians for a long time, and it is prone to discoloration and brittleness under sunlight, which seriously affects the nor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/64C08G18/48C08G18/32C08H7/00C08L75/04C09D175/04C08G18/42C08G18/62
CPCC08G18/6685C08G18/4854C08G18/6492C08G18/4081C08G18/3855C08G18/3234C08H6/00C08L75/04C09D175/04C08G18/42C08G18/6229C08G18/4063C08G2150/00C08L2201/08
Inventor 齐文斌赵朝阳董雨磊宁忠波
Owner SHANGHAI HECHENG POLYMER TECH CO LTD
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