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Preparation method of amic acid emulsion, and method for modifying surface of glass fiber with amic acid emulsion

A glass fiber and surface modification technology, which is applied in the preparation of amic acid emulsion and the surface modification of glass fiber, can solve the problems of poor interface temperature resistance and resin bonding effect, and achieve good heat resistance, less pollution, and good The effect of interface temperature resistance

Inactive Publication Date: 2019-09-24
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the defect that the current common glass fiber sizing agent has good film-forming and clustering performance, but poor interface temperature resistance and poor binding effect with resin, and provides a preparation method of amic acid emulsion and its effect on glass fiber. surface modification

Method used

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  • Preparation method of amic acid emulsion, and method for modifying surface of glass fiber with amic acid emulsion
  • Preparation method of amic acid emulsion, and method for modifying surface of glass fiber with amic acid emulsion
  • Preparation method of amic acid emulsion, and method for modifying surface of glass fiber with amic acid emulsion

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Embodiment 1

[0032] This embodiment provides a preparation method of amic acid emulsion and its surface modification effect on glass fiber, including: 3,3',4,4'-benzophenonetetracarboxylic dianhydride, 4,4'-di Diphenyl ether, N,N'-dimethylformamide, polyvinylpyrrolidone and water. The mass percentage of each component in the total mass of the emulsion is expressed as follows:

[0033] (1) 3,3',4,4'-benzophenonetetracarboxylic dianhydride 0.2%

[0034] (2) 4,4'-Diaminodiphenyl ether 0.1%

[0035] (3) Polyvinylpyrrolidone 0.1%

[0036] (4) N,N'-dimethylformamide 25%

[0037] (5) The balance is deionized water.

[0038] The preparation method of the amic acid emulsion of this embodiment includes the following steps:

[0039] Step 1. Weigh each component raw material as required

[0040] Step 2: Dissolve 0.2g of 3,3',4,4'-benzophenonetetracarboxylic dianhydride in 25ml of N,N'-dimethylformamide at a temperature of 25℃, stir until the solid is fully dissolved, and then add 0.1g 4,4'-diaminodiphenyl ether...

Embodiment 2

[0050] This embodiment provides a preparation method of amic acid emulsion and its surface modification effect on glass fiber, including: pyromellitic anhydride, 4,4'-diaminodiphenyl ether, N,N'-dimethyl Formamide, polyethylene glycol and water. The mass percentage of each component in the total mass of the emulsion is expressed as follows:

[0051] (1) Pyromellitic anhydride 0.227%

[0052] (2) 4,4'-Diaminodiphenyl ether 0.173%

[0053] (3) Polyethylene glycol 0.05%

[0054] (4) N,N-Dimethylformamide 20%

[0055] (5) The balance is deionized water.

[0056] The preparation method of the amic acid emulsion of this embodiment includes the following steps:

[0057] Step 1. Weigh each component raw material as required

[0058] Step 2: Dissolve 0.227g of pyromellitic anhydride in 20ml of N,N'-dimethylformamide at a temperature of 20℃, stir until the solid is fully dissolved, then add 0.173g of 4,4'-diaminodiphenyl Ether, stir until the solid is fully dissolved and then stand for 5 min to o...

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Abstract

The invention belongs to the field of glass fiber impregnating compounds, and concretely relates to a preparation method of an amic acid emulsion, and a method for modifying the surface of a glass fiber with the amic acid emulsion. The milky amic acid emulsion with a solid content of 0.1-5% is prepared by controlling a molar ratio of aromatic dianhydride to 4,4'-diaminodiphenyl ether at 1.05:1 to 2:1 and a ratio of water to N,N'-dimethylformamide at 2:1 to 10:1 and adding 0.01-5% of an acidic or neutral water-soluble polymer, and the effect of modification of the surface of the glass fiber with the amic acid emulsion is determined by detecting the interfacial shear strength using a micro-debonding process. Active groups such as -COOH and -NH in the emulsion react with silicon hydroxyl groups on the surface of the glass fiber to form a strong hydrogen bond or chemical bond, and heating is performed for imidization to achieve a good interface temperature resistance and form a good compatibility with the resin in order to improve the interface properties of the fiber, so the amic acid emulsion has broad application prospects.

Description

Technical field [0001] The invention belongs to the field of glass fiber sizing agents and relates to a preparation method of amic acid emulsion and surface modification of glass fiber. Background technique [0002] Glass fiber reinforced resin-based composite materials are widely used in aerospace manufacturing, automotive parts, electronic products, light industrial machinery and other fields because of their light weight, high strength, low price, and good mechanical properties. However, the toughness of glass fiber is not strong, the elongation at break is low, and there are problems such as filament breakage during the manufacturing process. During the production process, coating and film formation are performed. The sizing agent can play two roles in it: one is Give the fiber controllable appearance performance, make the fiber into a fiber bundle with a certain width and hardness, reduce the number of filaments generated by friction during the production and processing; the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08K9/04C08K7/14C08L63/00
CPCC08G73/1071C08G73/105C08K9/08C08K7/14C08L63/00
Inventor 周晓东叶英刘媛
Owner EAST CHINA UNIV OF SCI & TECH
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