Yellowing-resistant polypropylene plastic and preparation method thereof

A polypropylene plastic, anti-yellowing technology, applied in the field of plastics, can solve the problems of yellowing of color and limited application range of polypropylene plastic, and achieve the effects of preventing migration, good yellowing resistance, and reducing polarity

Pending Publication Date: 2022-07-29
界首市亚鑫塑业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The color turns yellow under the sun, ultraviolet rays for a long time or under the action of heat and oxygen stress, which limits the application range of polypropylene plastics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of modified zinc oxide:

[0033] Step S11, mixing 2,2,6,6-tetramethylpiperidin-4-ol and dichloromethane, then adding aqueous sodium hydroxide solution and tetrabutylammonium bromide, stirring for 30min at a temperature of 20°C, Then cool down to 0°C, then add cyanuric chloride three times with a time interval of 10min. After the addition, the reaction is stirred for 3h at a temperature of 25°C. After the reaction is completed, saturated brine is added for stirring and liquid separation. The phase is dried with anhydrous sodium sulfate, and then recrystallized with n-hexane to obtain a light-stable monomer; wherein, the mass fraction of the aqueous sodium hydroxide solution is 50%; 2,2,6,6-tetramethylpiperidine-4- The dosage ratio of alcohol, sodium hydroxide aqueous solution, tetrabutylammonium bromide and cyanuric chloride is 0.08mol:25mL:0.02g:0.004mol;

[0034] Step S12, under nitrogen protection, mix the light-stable monomer and tetrahydrofuran, add pot...

Embodiment 2

[0038] Preparation of flame retardant:

[0039] Mix nano-silica and ethanol aqueous solution, then add γ-(2,3-glycidoxy)propyltrimethoxysilane, stir for 2 h, filter and dry to obtain coupling agent modified silica; ethanol aqueous solution The volume ratio of ethanol and deionized water is 4:1; the mass ratio of nano-silica and γ-(2,3-glycidoxy)propyltrimethoxysilane is 5:1;

[0040]Under nitrogen protection, mix o-phenylenediamine and mixed solvent, then add phosphorus oxychloride, reflux for 4 hours, cool to room temperature after the reaction, wash with acetonitrile, and dry to obtain o-phenylenediamine phosphorus oxychloride; o-phenylenediamine phosphorus oxychloride; The molar ratio of phenylenediamine and phosphorus oxychloride is 1:1; the mixed solvent is made by mixing equal volumes of dichloromethane and dichloroethane; o-phenylenediamine phosphorus oxychloride and pyridine are mixed, and then 4,4' - Methylene diphenylamine, stir and react at 60°C for 30min, then add...

Embodiment 3

[0043] A preparation method of yellowing-resistant polypropylene plastic, comprising the following steps:

[0044] According to parts by weight, 80 parts of polypropylene, 2 parts of modified zinc oxide prepared in Example 1, 10 parts of the flame retardant prepared in Example 2, 5 parts of maleic anhydride grafted polypropylene, 2 parts of wollastonite and 1 part of Add dimethyl silicone oil to the mixer, stir for 3 minutes to obtain a mixture, and then extrude the obtained mixture with a twin-screw extruder, water-cooled, cut into pellets, and then dried in an oven at 60 °C for 2 hours, and then injected with an injection molding machine. Injection molding, the injection temperature is 210 DEG C, to obtain a yellowing-resistant polypropylene plastic.

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PUM

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Abstract

The invention relates to an anti-yellowing polypropylene plastic and a preparation method thereof, and belongs to the technical field of plastics, the anti-yellowing polypropylene plastic comprises the following raw materials by weight: 80-90 parts of polypropylene, 2-3 parts of modified zinc oxide, 10-12 parts of a flame retardant, 5-6 parts of a compatilizer, 2-3 parts of a filler and 1-3 parts of a lubricant; the preparation method comprises the following steps: mixing the raw materials, extruding by using a double-screw extruder, water-cooling, pelletizing and carrying out injection molding. In order to delay or inhibit the aging process of polypropylene, 2, 2, 6, 6-tetramethylpiperidine-4-alcohol containing a hindered amine structure is selected as a raw material, a modifier containing the hindered amine structure is grafted on the surface of zinc oxide through substitution, addition and other reactions in sequence, the surface polarity of zinc oxide is reduced, the dispersity of zinc oxide in polypropylene is improved, and meanwhile, the aging resistance of polypropylene is improved. The migration of the modifier can be prevented; the anti-yellowing effect is good.

Description

technical field [0001] The invention belongs to the technical field of plastics, and in particular relates to a yellowing-resistant polypropylene plastic and a preparation method thereof. Background technique [0002] Polypropylene (PP), which has high impact resistance, strong mechanical properties, resistance to various organic solvents and acid and alkali corrosion, is widely used, although polypropylene has good electrical properties and high-frequency insulation and It is not affected by humidity, but there are unstable tertiary carbon atoms in the polypropylene chain. In the presence of oxygen, only a small amount of energy is required to remove the hydrogen on the tertiary carbon atom to become a tertiary carbon radical. Tertiary carbon free radicals are very active, which can cause various reactions in the molecular chain, including chain growth and chain degradation, resulting in the loss of the original properties of polypropylene and the aging of polypropylene mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L51/06C08K9/06C08K3/36C08K3/22C08K5/5399
CPCC08L23/12C08L2201/08C08K2201/011C08K2003/2296C08L51/06C08K9/06C08K3/36C08K3/22C08K5/5399
Inventor 苏伟
Owner 界首市亚鑫塑业科技有限公司
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