SU654642A1 - Composition for obtaining film dielectric - Google Patents

Description

The invention relates to the chemistry of high molecular weight compounds, more specifically to the field of producing film polymer dielectrics based on cellulose ethers, which can be widely used to create capacitors in the radio engineering industry. A known composition for the production of film dielectrics containing modified cyanoethyl cellulose is a cyanethyl acetylcellulose displaced ether with different ratios of cyanoethyl, acetyl and hydroxyl groups (cyanoethyl groups from 0.3 to 2.07; acetyl from 0.6 to 1.81; hydroxyl from 0.1 to 1.36 per glucose unit). The strength of films from Iianztiltsel. sholoza of various composition in the range of 7-9 kg / mm. Dielectric constant & rises linearly with an increase in the content of cyanethyl groups in the zfira from 3.5 to 11, while simultaneously reducing the specific volume resistance from 10 to 10 CM-CM. By selecting a specific composition of mixed ether, it is possible to vary the electrical properties of the dielectric based on it,. The method of obtaining a known foam dielectric based on mixed cyanoethyl acetyl cellulose ether is difficult because of the difficulty of synthesizing mixed cyanoethyl ethers of a given composition and it is difficult to obtain in this way certain values of the dielectric parameters of the film. A composition is also known for producing film dielectrics based on cyanoethyl cellulose and a solvent. The films obtained have high dielectric properties. However, in the process, it is impossible to vary the properties of a dielectric by a known method. The purpose of the invention is to improve the technology of manufacturing a dielectric film with an adjustable value of dielectric properties. This is achieved by combining Cyanic ester of cellulose and acetobut cellulose in solutions With the following ratio of components, weight.2 Cyanethyl ester 0,8-32 cel. Pulp Acetobutyrate 3,2-0,8 cellulose

36546424

PS butyric acid 0.7-0.9; according to the cc volume is 2.0-2.7 and the degree of polyacetic acid is 2.1-2.3 and the degree of zacin is 250-300 and the solvent, polymerization is 800-900, as well as cyac- e. Characterization of the initial components of ethylcellulose (CEP) with a degree of frost mixtures are presented in the table. Characterization of the starting cellulose ethers

Claims (4)

CEC 10.2 - - 2.0 - - EOO ABC - 41.0 19.5 - 2.3 0.7900 Example 1. Mix Equally Equally Centered solutions of cyanethylcellulose (CEC) SP 3QO and degree of substitution 2.0 and cellulose acetobutyrate (ABC) SP 900 and the degree of substitution in oil and acid groups 0.7 and acetic acid groups 2.3 in acetone and get a solution at a ratio of CEC: ABC: acetone equal to 0.8: 3.2: 96. The solution is thoroughly mixed and the film is cast onto a horizontal glass. The film is dried at 20 s in a vacuum drying cabinet for 24 hours. The strength of the film is 8.6 kg / mm, an elongation of 9%, tg, (1 KHz) 0.026; tg 8-20 ° С (1 kHz) 0.015, - at 4.7, fv at 2.0 ° С OmSM. For example 2. Similarly to Example 1, a film is obtained from a solution of the following ratio. CEC: ABC: acetoH; equal to 1.6g2.4z96, the strength of the film is 7.7 kg / m 4 elongation .6%, d so (1 KHZ) 0.040; at 2Q ° C (1 kHz) 0.013; at 20 ° C 5.5; pv at 20 ° C Ohm-cm. And pm e R, 3. Under the conditions of Example 1, a film is prepared from a solution at a ratio of CEC: ABC-acetone equal to 2.4: 1.6: 96. The strength of the film is 6.6 kg / mm, an elongation of 6.5%, tg (I KHZ) 0.058; tgffpri (1 kHz) 0.013; at 20 ° С 6.5 pv at 20 ° С Ohm-see. Example 4. Under the conditions of Example 1, a PL: filter was obtained from a solution at a ratio of CEC: ABC: acetone equal to 3.2: 0.8: 96. The strength of the film is 5.8 kg / mm, an elongation of 4.2%; tg S (1 KHZ) 0.090; tganpH (1 kHz) 0.015; e at 20 With 9.4; | Jv at 20 ° C Ohm. see Example 5. Equally concentrated solutions of cyanethyl cellulose SP 250 and a degree of substitution of 2.0 and acetobutyrate of cellulose SP 900 and a degree of substitution in oil-acid groups of 0.7 and acetic acids 6.7 4.3 0.12 0.01 0,017 14 13.0 are mixed. 7.1 7.1 0.014 0.013 3.3 17.8 groups 2.3 in acetone and get the solution with the ratio of CEZ: ABC: acetone, equal to 0.8: 3.2: 96. From the solution cast film. The strength of the film is 8.0 kg / mm, an elongation of 9.2%; tg S (1 KHZ) 0.026; tgS at 20 ° C (1 kHz1 0.015; at 20 ° C 4.7; V20 ° C .2 ohm-cm. Example 6. Equally concentrated solutions of cyanethylcellulose SP 300 and degree of substitution 2 and cellulose acetobutyrate of 800 and oil substitution are mixed acid groups of 0.7 and acetic acid groups of 2.3 in acetone and get a solution with the ratio of CEC: ABC:. acetone; equal to 0.8: 3.2: 96. A film is cast from the solution. ; elongation 9.4%; tg TH, "., y (1 KHZ) 0.026; tgS 20C (1 kHz) O ,, 015; at 20 ° C 4.6; Ovpr. 20 ° C Ohm. See Example 7 Mix equally concentrated solutions of cyanoethyl cellulose SP 300 degree s amesteni 2.0 and acetobutyrate cellulose SP 900 with a degree of substitution in butyric acid groups O, 9 in acetic acid groups 2.1 in acetone and get a solution) at a ratio of 11EC: ABC: acetone, equal to 0.8: 3.2: 96 Cast film. The strength of the film is 8.6 to g / mm 2., the elongation is 9%; tg U kgz) 0.026; tge20 ° C (1 KHZ) 0.015; at 20 With 4.7; J) vnpH 20 ° C Om. Cm. Example 8. Equal-concentrated solutions of cyanethylcellulose SP 300 are mixed with a degree of substitution of 2.7 and acetobutyrate cellulose SP 900 and a degree of substitution in the O butyl groups O, .7, in acetic acid groups 2, 3. Get the solution when the ratio of the CEC: ABC: acetone, equal to, number 3.2: 0.8: 96. Cast film. Durability of a film is 5,8 kg / mm; elongation of 4.2%; tg - khz) 0.10; tgfi 20C (1 KHZ) 0.018; - at 20 ° C 10.7; 565 The proposed technical solution makes it possible to improve the technology for producing film polymer dielectrics by combining cyanethylcellulose and cellulose acetobutyrate in acetone in various ratios, which makes it possible to adjust the dielectric properties of the mixture composition, and can vary in intervals from 4.7 to 9, 4. Claim 1. Composition for producing dielectric film based on cellulose cyanoethyl ether and solvent, which, in order to control the dielectric in film properties, the composition dipolarly contains cellulose acetobutyrate in the following ratio of components, weight,%; Cellulose cyanethyl ether 0.8-3.2 Cellulose acetobutyrate lulose 3208 Solvent Else. 2, Composition POP.1, distinguished by the fact that it contains cyanoethyl cellulose with a degree of substitution of 2.0-2.7 and a degree of polymerization of 250-300 and cellulose acetobutyrate with a degree of substitution in butyric acid of 0.7-9.9 acetic acid 2, 1-2,3 and the degree of polymerization of 800-900.