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Preparation method of multi-layer low-gloss black polyimide thin film

A technology for preparing black polyimide and film, applied in the direction of coating, can solve the problems of high preparation cost, complex preparation process, high production control precision requirements, etc., achieve low gloss performance, simple process, improve shading performance and The effect of insulating properties

Inactive Publication Date: 2018-05-25
GUILIN ELECTRICAL EQUIP SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, the existing multi-layer matt black polyimide film preparation methods are difficult to implement due to the complex preparation process, high production control precision requirements and high preparation costs.

Method used

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  • Preparation method of multi-layer low-gloss black polyimide thin film
  • Preparation method of multi-layer low-gloss black polyimide thin film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Ⅰ. Preparation of polyamic acid film

[0050] In a nitrogen atmosphere, controlling the temperature of the synthesis system to 10℃, add 2.39kg of aromatic diamine 4,4'-diaminodiphenyl ether (4,4) to 45kg of N,N'-dimethylacetamide (DMAC) solvent '-ODA) is stirred and dissolved. After 4,4'-ODA is completely dissolved, add 2.61kg of aromatic dianhydride pyromellitic diacid (PMDA) with a molar ratio of 1:1 to aromatic diamine in 8 times at a constant speed , And stirred at 1200r / min, synthesized by polycondensation reaction for 12h to obtain a polyamic acid resin solution with a solid content of M=5kg, that is, a solid content ratio of 10% by weight; the polyamic acid film was obtained by salivation; the thickness of the polyamic acid film in this example It is 10μm.

[0051] Ⅱ. Preparation of black blended polyamic acid resin solution

[0052] Ⅱ-1. Preparation of polyamic acid resin solution

[0053] Prepare a polyamic acid resin solution with a solid content M of 10% by weight ...

Embodiment 2

[0071] Ⅰ. Preparation of polyamic acid film

[0072] In a nitrogen atmosphere, control the temperature of the synthesis system to 22℃, add 6.38kg of aromatic diamine 2,2'-bis(trifluoromethyl)benzidine to 37.5kg of N,N'-dialkylcarboxamide solvent and stir. Dissolve, when it is completely dissolved, add 5.99kg of aromatic dianhydride 3,3',4,4'-biphenyltetracarboxylic dianhydride (BPDA) with a molar ratio of 0.98:1 to the aromatic diamine at a constant speed in 3 times ), and stirred at 1000r / min, synthesized by polycondensation reaction for 8 hours to obtain a polyamic acid resin solution with a solid content of M=12.4kg, that is, a solid content ratio of 25% by weight; a polyamic acid film is obtained by salivation; this example is a polyamic acid film The thickness is 80μm.

[0073] Ⅱ. Preparation of black blended polyamic acid resin solution

[0074] Ⅱ-1. Preparation of polyamic acid resin solution

[0075] Prepare a polyamic acid resin solution with a solid content M of 25% by wei...

Embodiment 3

[0091] Ⅰ. Preparation of polyamic acid film

[0092] In a nitrogen atmosphere, the temperature of the synthesis system is controlled to 50℃, and 7.92kg of aromatic diamine 3,4'-diaminodiphenyl ether (3,4'-ODA) is added to 25kg of N-methylpyrrolidone (NMP) solvent. Stir and dissolve. After it is completely dissolved, add 17.23 kg of aromatic dianhydride 2,2-bis(3,4-dicarboxylic acid phenyl)hexafluoro in a molar ratio of 1.02:1 to aromatic diamine at a constant speed in 5 times Propane dianhydride (6FDA), stirred at 1000r / min, synthesized by polycondensation reaction for 8 hours to obtain a polyamic acid resin solution with a solid content of M=25.15kg, that is, a solid content ratio of 50% by weight; the polyamic acid film is obtained by salivation; Example The thickness of the polyamic acid film is 30 μm.

[0093] Ⅱ. Preparation of black blended polyamic acid resin solution

[0094] Ⅱ-1. Preparation of polyamic acid resin solution

[0095] Prepare a polyamic acid resin solution with...

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Abstract

The invention discloses a preparation method of a multi-layer low-gloss black polyimide thin film. The preparation method comprises the following main steps: I, preparing a polyamide acid film; II, preparing a black blending polyamide acid resin solution; III, evenly coating the upper and / or lower surface of the polyamide acid film with the black blending polyamide acid resin solution, heating andcuring to obtain a multi-layer black polyamide acid film; IV, and stretching in two ways, conducting imidization and sizing to obtain the multi-layer low-gloss black polyimide thin film. The preparation of the black blending polyamide acid resin solution in the step II comprises the following steps: preparing the polyamide acid resin solution, a black slurry and a delustrant dispersion solution,adding a flocculant into the three, blending, stirring at the low temperature, defoaming, preheating, and agglomerating. The average particle size of a black pigment and a delustrant is 0.01-0.8 [mu]m, the delustrant is added into the condensation polymerization synthesis process of a polyamide acid resin, and the light transmittance, the glossiness, the electrical property and the physical and mechanical property of the obtained multi-layer thin film are obviously improved.

Description

Technical field [0001] The invention relates to a polyimide film preparation technology, in particular to a method for preparing a multilayer low-gloss black polyimide film. Background technique [0002] Flexible printed circuit boards (FPC) are widely used in 3C products, optical lens modules, liquid crystal display (LCD) modules and solar cells, and polyimide film (PI film for short) is often used as its substrate Or cover film material. In the application process, because the traditional PI film has high surface flatness, the surface of the film reflects most of the incident light and produces high gloss. The high gloss film surface has glare or astigmatism caused by light reflection, which causes visual discomfort and makes eyes tired when viewed for a long time. Especially the high-gloss PI film polyimide film with black, white, blue, red and other colors, the reflected light generated on the surface has a more significant impact on vision. [0003] On the other hand, when P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C08J5/18C09D179/08C09D7/65C09D7/61
CPCC08J5/18C08J7/04C08J7/0427C08J2379/08C08J2405/02C08J2405/04C08J2433/02C08J2433/26C08J2439/00C08J2479/08C08K2003/2227C08K2003/2241C08K2201/003C08L2205/03C09D179/08C08L33/26C08K3/36C08L33/02C08K3/22C08L5/02C08L5/04C08L39/00C08L79/08
Inventor 任小龙汪英周福龙朱恒斌
Owner GUILIN ELECTRICAL EQUIP SCI RES INST
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