Colorless transparent polyimide film

A technology of transparent polyimide and polyimide film, applied in the field of functional films, can solve the problems of limited comprehensive performance improvement, low refractive index and high birefringence

Inactive Publication Date: 2019-12-20
合肥中汇睿能能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, researchers at home and abroad are using the above-mentioned structural monomers and combining them to develop new formulas, and preparing high light transmittance, high modulus, relatively high glass transition temperature (Tg) and relatively low Colorless and transparent polyimide film with CTE and low heat shrinkage, but the comprehensive performance improvement of the film is limited, such as high haze, low refractive index, high birefringence, low surface hardness and other defects.
Even if the polymerized monomer and solvent are refined and pretreated before the polymerization is carried out, the improvement of its comprehensive performance is greatly limited.
In addition, in the prior art, some high mo

Method used

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  • Colorless transparent polyimide film
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  • Colorless transparent polyimide film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Ⅰ. Preparation of polyamic acid resin solution containing nitrate inorganic filler

[0048] In a nitrogen atmosphere, control the temperature of the synthesis system at 15°C, add 1.50kg of diamine 2,2'-bis(trifluoromethyl)-4 to 33.12kg of N,N'-dimethylacetamide (DMAC) solvent, 4'-Diaminobiphenyl (2,2'-TFDB) was stirred and dissolved. After 2,2'-TFDB was completely dissolved, 1.38 kg of dianhydride 3 with a diamine molar ratio of 1:1 was added in 10 times at a uniform speed. , 3',4,4'-biphenyltetracarboxylic dianhydride (s-BPDA), and stirred at 1500r / min, synthesized by polycondensation reaction for 24 hours to obtain a solid content M = 2.88kg, that is, the solid content ratio is 8wt% Polyamic acid resin solution;

[0049] Keep the polymerized polyamic acid resin solution system at 15°C and directly add 0.00288kg (0.1wt%) zinc nitrate inorganic filler powder with a pH value of 4.8, which has been pretreated at 98°C for 10h, to the polyamic acid resin solution for co-po...

Embodiment 2

[0054] The difference between this example and Example 1 is that "keep the polymerized polyamic acid resin solution system at 15°C and directly add 0.00576kg (0.2wt%) of nitric acid with a pH value of 4.8 that has been pretreated at 98°C for 10 hours. Add zinc inorganic filler powder to polyamic acid resin solution for blending".

Embodiment 3

[0056] The difference between this example and Example 1 is that "keep the polymerized polyamic acid resin solution system at 15°C and directly add 0.00864kg (0.3wt%) of nitric acid with a pH value of 4.8 that has been pretreated at 98°C for 10 hours. Add zinc inorganic filler powder to polyamic acid resin solution for blending".

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Abstract

The invention belongs to the technical field of functional films, and particularly relates to a colorless transparent polyimide film which comprises a substance A and a substance B. The substance A isa nitrate inorganic filler; the substance B is an anhydride-terminated polyamic acid resin obtained by carrying out condensation polymerization on a diamine and a dianhydride; the substance A and thesubstance B are blended and subjected to biaxial stretching and imidization treatment to obtain the polyimide film; the nitrate inorganic filler accounts for 0.1wt%-7.2wt% of the total weight of thepolyimide film. The beneficial effects of the invention are that: the solvent soluble nitrate inorganic filler is added, and the inorganic filler in the colorless transparent polyimide synthesis process is ensured not to reduce the mechanical property, the thermal property (shrinkage rate, thermal expansion coefficient and the like) and the insulating property (electrical strength, dielectric constant and the like) of the film, and achieve the high refractive index and the low birefringence parameter of the colorless transparent polyimide film, the market requirement can be better met, and theproduct application field is expanded.

Description

technical field [0001] The invention belongs to the technical field of functional films, in particular to a colorless and transparent polyimide film. Background technique [0002] In the future, the development of optoelectronic devices will gradually show the trend of light weight, large size, ultra-thin and flexible. As a traditional transparent substrate material, glass can no longer meet the development requirements of future flexible packaging technology. With the advantages of transparency, flexibility, light weight, and high impact resistance, it has become the first choice for flexible optoelectronic packaging substrate materials in the future. Polyimide film has excellent heat resistance and stability, which can meet the requirements of high temperature processes such as electrode film deposition and annealing treatment in the process of optoelectronic device processing. Therefore, the development of high transparency polyimide materials has become the focus of rese...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08K3/28C08J5/18C08G73/10
CPCC08G73/1039C08G73/1067C08J5/18C08J2379/08C08K3/28C08K2003/287
Inventor 王文静王海生
Owner 合肥中汇睿能能源科技有限公司
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