Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Polyamic acid solution and its preparation method and application

A technology of polyamic acid and solution, which is applied in the direction of single-component synthetic polymer rayon, textiles and papermaking, and fiber chemical characteristics, which can solve the problems of difficult to control product quality decline, narrow molecular weight distribution of polyamic acid solution, and gel particles. Low content and other problems, to achieve the effect of not easy to defect, reduce bad spots and defects, and improve quality

Active Publication Date: 2021-05-11
CHINA PETROLEUM & CHEM CORP +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is that in the prior art, the polyamic acid stock solution is uneven and there are many gel particles, and the technical process is difficult to control the decline in product quality. The molecular weight distribution of the amic acid solution is narrow and the gel particle content is very low, it is easy to control stably in the subsequent processing process, and the product is not easy to produce defects, and high-performance polyimide products can be obtained

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Polyamic acid solution and its preparation method and application
  • Polyamic acid solution and its preparation method and application
  • Polyamic acid solution and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Dissolve 23.38g (116.77mmol) of diphenyl ether diamine (ODA) in 273.94g of N,N-dimethylacetamide (DMAc), stir at 25°C, after complete dissolution, add 24.96g (114.43mmol) Perphthalic dianhydride (PMDA), fully reacted to obtain prepolymer solution 1 (dianhydride, diamine molar ratio 0.98, solid content 15%, the same below). Using the same method, 19.41g (96.92mmol) ODA, 289.68g DMAc, and 31.71g (145.38mmol) PMDA were used to prepare prepolymer solution 2 (molar ratio 1.50, solid content 15%). Add 11.36 g of prepolymer solution 2 to prepolymer solution 1 at a rate of 22.0 g / h, and stir thoroughly at 25° C. to obtain a final polyamic acid solution (molar ratio 0.994, solid content 15%). The apparent viscosity of the final solution was measured to be 290 Pa·s, and the molecular weight distribution was 1.44. After passing the solution through a 2 μm glass fiber filter membrane, the filter screen was irradiated by ultraviolet fluorescent lamps without foreign matter.

Embodiment 2

[0044]Dissolve 2002.4g (10mol) ODA in 23089.0g DMAc, stir at 25°C, after complete dissolution, add 2072.1g (9.5mol) PMDA, and obtain prepolymer solution 1 (molar ratio 0.95, solid content 15 %). In the same way, 1001.2 g (5 mol) ODA, 14944.0 g DMAc, and 1635.9 g (7.5 mol) PMDA were used to prepare prepolymer solution 2 (molar ratio 1.50, solid content 15%). 2757.5 g of prepolymer solution 2 was added to prepolymer solution 1 at a rate of 460 g / h, and fully stirred at 25° C. to obtain a final polyamic acid solution (molar ratio 0.99, solid content 15%). The measured apparent viscosity of the final solution was 248 Pa·s, and the molecular weight distribution was 1.42. After passing the solution through a 2 μm glass fiber filter membrane, the filter screen was irradiated by ultraviolet fluorescent lamps without foreign matter.

Embodiment 3

[0046] Dissolve 2002.4g (10mol) ODA in 27837.0g N-methylpyrrolidone (NMP), stir at 0°C, after completely dissolving, add 1090.6g (5mol) PMDA, and obtain prepolymer solution 1 (mol) after fully reacting Ratio 0.5, solid content 10%). In the same way, 1001.2g (5mol) ODA, 28641.6g NMP, and 2181.2g (10mol) PMDA were used to prepare prepolymer solution 2 (molar ratio 2.0, solid content 10%). Add 31,824.0 g of prepolymer solution 2 to prepolymer solution 1 at a rate of 10,000.0 g / h, and stir thoroughly at 0° C. to obtain a final polyamic acid solution (molar ratio 1, solid content 10%). The measured apparent viscosity of the final solution was 168 Pa·s, and the molecular weight distribution was 1.38. After passing the solution through a 2 μm glass fiber filter membrane, the filter screen was irradiated by ultraviolet fluorescent lamps without foreign matter.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
tensile strengthaaaaaaaaaa
elastic modulusaaaaaaaaaa
Login to View More

Abstract

The invention provides a polyamic acid solution and its preparation method and application, which mainly solves the problem in the prior art that the polyamic acid stock solution is uneven and there are many gel particles, and the technical process is difficult to control the decline in product quality. The present invention provides a polyamic acid solution, comprising a mixed solution of a prepolymer solution 1 and a prepolymer solution 2; wherein, the prepolymer solution 1 is composed of X moles of diamine and Y moles of dianhydride The reactants are obtained by reacting; the prepolymer solution 2 is obtained by reacting reactants including Z moles of diamine and K moles of dianhydride; the X, Y, Z, and K satisfy: 0.5≤Y / X≤0.98, The technical solution of 1.02≤K / Z≤2.0 can better solve this problem and can be used in the industrial production of polyimide materials.

Description

technical field [0001] The invention relates to a polyamic acid solution with narrow molecular weight distribution and homogenization, its preparation method and application. Background technique [0002] Polyimide is a kind of polymer with excellent comprehensive performance, which has excellent heat resistance, low temperature resistance, self-lubrication, radiation resistance and flame retardancy, as well as excellent mechanical properties and dielectric properties . [0003] The main chain of ordinary polyimide contains a large number of imide ring structures. Due to the electronic polarization and crystallinity, there is a strong force between the polyimide molecular chains, which makes the polyimide molecular chains tightly packed. As a result, it is insoluble and infusible and difficult to process and shape, which seriously affects its application value. In order to solve the solubility problem, the precursor of polyimide-polyamic acid solution is usually synthesize...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10C08J5/18C08L79/08D01F6/74
CPCC08G73/1071C08J5/18C08J2379/08D01F6/74
Inventor 崔晶孙旭阳陈雪刘京妮陈大为
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com