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Low-color-difference fiber-added nylon and forming process thereof

A molding process, nylon technology, applied in the production of bulk chemicals, etc., can solve the problems of large color difference, reduce floating fibers on the surface of fiber-added nylon, reduce surface floating fibers, improve molding quality, and improve chemical bonding and physical support. Effect

Active Publication Date: 2021-04-09
HANGZHOU UNITED TOOLS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to overcome the problem of large color difference after molding in the existing colored fiber-added nylon, and provides a low-color-difference fiber-added nylon and its molding process. The invention enriches the color of nylon by adding a modified toner, and at the same time The oxidation resistance and stability of the toner are better guaranteed; in addition, the viscosity reducer and modified glass fiber are added to increase the fluidity of nylon and enhance the bonding ability between glass fiber and nylon matrix, effectively reducing fiber addition. Floating fibers on the surface of nylon after molding, which greatly improves the molding quality of fiber-reinforced nylon

Method used

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  • Low-color-difference fiber-added nylon and forming process thereof
  • Low-color-difference fiber-added nylon and forming process thereof

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preparation example Construction

[0042] The preparation method of described modified toner is:

[0043] 1) Coating isolation layer: Pour melamine and formaldehyde into the reaction vessel at a molar ratio of 1:2.5-3, react in a water bath at 65-70°C for 2.5-3 hours, add coloring agent and absolute ethanol to the reaction vessel, Add deionized water, adjust the pH value to 5-6 with hydrochloric acid, heat at 80-85°C for 1-2h, filter to obtain the precipitate, wash it with deionized water, dry at 120-130°C for 1-2h to obtain melamine formaldehyde resin Coated toner; the mass ratio of added toner, absolute ethanol and melamine is 2:3-4:1;

[0044] 2) Prepare the porous layer: add the melamine-formaldehyde resin-coated toner to the cellulose solution with a concentration of 12-15wt%, stir evenly and perform ultrasonic dispersion, and then place the dispersion solution in an environment of -6 to -2°C Freeze for 48-60 hours; then thaw the frozen product at room temperature to obtain cellulose hydrogel, and use eth...

Embodiment 1

[0057] A low-chromatic-difference fiber-added nylon. The components of the low-color-difference fiber-added nylon are as follows in terms of mass: 65 parts of nylon, 18 parts of modified glass fibers with a length of 4 mm, 3 parts of polyacrylic acid, 2 parts of titanium dioxide, and quartz powder. 2 parts, 4 parts of modified toner, 1.5 parts of viscosity reducer.

[0058] The preparation method of described modified toner is:

[0059] 1) Coating isolation layer: Pour melamine and formaldehyde into the reaction vessel at a molar ratio of 1:2.8, react in a water bath at 68°C for 2.8 hours, add coloring agent and absolute ethanol to the reaction vessel, and add deionized water, Use hydrochloric acid to adjust the pH value to 5.5, heat at 82°C for 1.5h, filter the precipitate, wash it with deionized water, and dry it at 125°C for 1.5h to obtain the melamine-formaldehyde resin-coated toner; the added toner, The mass ratio of absolute ethanol to melamine is 2:3.5:1;

[0060] 2) ...

Embodiment 2

[0073] A low-chromatic-difference fiber-added nylon. The components of the low-color-difference fiber-added nylon are as follows in terms of mass fractions: 62 parts of nylon, 18 parts of modified glass fibers with a length of 3.5 mm, 2.5 parts of polyacrylic acid, 1.5 parts of titanium dioxide, quartz 1.5 parts of powder, 3.5 parts of modified coloring agent, and 1.2 parts of viscosity reducer.

[0074] The preparation method of described modified toner is:

[0075] 1) Coating isolation layer: Pour melamine and formaldehyde into the reaction vessel at a molar ratio of 1:2.6, react in a water bath at 66°C for 2.8 hours, add coloring agent and absolute ethanol to the reaction vessel, add deionized water, Adjust the pH value to 5.2 with hydrochloric acid, heat at 81°C for 1.2h, filter the precipitate, wash it with deionized water, and dry it at 122°C for 1.2h to obtain the melamine-formaldehyde resin-coated toner; the added toner, The mass ratio of absolute ethanol to melamine ...

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Abstract

The invention relates to the technical field of nylon preparation, and discloses low-color-difference fiber-added nylon and a forming process thereof in order to solve the problem of large color difference after forming in existing colored fiber-added nylon. The low-color-difference fiber-added nylon is prepared from the following components in parts by mass: 60-70 parts of nylon, 15-20 parts of modified glass fiber with a length of 3-5 mm, 2-4 parts of polyacrylic acid, 1-3 parts of titanium dioxide, 1-3 parts of quartz powder, 3-5 parts of a modified coloring agent and 1-2 parts of a viscosity reducer. According to the invention, the color of nylon is enriched by adding the modified coloring agent, and the oxidation resistance and stability of the coloring agent are well ensured; and besides, the viscosity reducer and the modified glass fiber are added to increase the fluidity of the nylon and enhance the binding capacity of the glass fiber and a nylon matrix, so surface floating fibers of the formed fiber-added nylon are effectively reduced, and the forming quality of the fiber-added nylon is greatly improved.

Description

technical field [0001] The invention relates to the technical field of nylon preparation, in particular to a low-color-difference fiber-added nylon and a molding process thereof. Background technique [0002] Nylon PA, which can also be polyacid, is a high polymer like other plastics, the world's first completely man-made fiber and plastic. Fiber-reinforced nylon is a kind of modified material, which is the most widely used nylon modified material, that is, glass fiber and other reinforcing materials are added to the nylon collective to enhance the mechanical properties of nylon. The molding temperature of fiber-reinforced nylon is as high as 270 Celsius, when the color of the molded product is required, toner needs to be added. When producing accessories such as color, the toner is easily decomposed and discolored at high temperature, resulting in a large deviation between the color of the product and the required color after the product is released, and appears lighter. O...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/00C08L33/02C08K13/06C08K9/10C08K9/08C08K7/14C08K3/22C08K3/36C08J5/08C08J5/10
CPCC08J5/08C08J5/10C08J2377/00C08J2433/02C08K13/06C08K9/10C08K9/08C08K7/14C08K2003/2241C08K3/36Y02P20/54
Inventor 欧阳忠王伟毅
Owner HANGZHOU UNITED TOOLS CO LTD
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