SU1407929A1 - Method of modifying cellullose nitrates - Google Patents

Abstract

The invention relates to the field of processing of cellulose nitrates and can be used to obtain low flammability plastics based on modified cellulose nitrate and low-flammable varnishes. The invention makes it possible to reduce the flammability of cellulose nitrates while maintaining the degree of substitution in nitric acid groups (decomposition temperature 227-233 ° C), to reduce the consumption of acid chloride due to the fact that cellulose nitrate is treated with phosphoric acid chloride in an amount of 0.05-0.1 mol per 1 mol of the elementary unit of cellulose nitrate 0.25-3.0 h at 20-40 ° C in hexane. i (L

Description

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QD N9

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u; fipot (ggiosits to rK jiopnCxiT-nitrols tse: tsik1loz11 | (MC)) and can be used to obtain low-flammability plastics and flammable varnishes based on modified cellulose nitrate.

The purpose of the invention is to reduce the flammability of the target product while maintaining the degree of emesheni on the nitric acid groups and reducing the consumption of chloroanhydride.

Example 1. A sample of NTS (0.1 g) is placed in a flask and treated with a solution of POClj (0.05 M) In hexane (1:20) at 20 s for 3 h, after which the reaction mixture is pressed on the filter, the product is washed with hexane, 50% ethanol, water until neutral and negative for Cl, dried.

The yield is 81.3%, the P content is 0.13%, N is 12.32%, the beginning of decomposition is 210 ° C, the product is completely soluble in ethyl acetate, acetone.

Example 2. A sample of NTS (0.1 g) is treated with a solution of POCl (0.07 M) in hexane (1:20) for 3 hours, then washed with hexane, 50% -11 th ethanol and water until neutral with litmus and negative on –C. The product is air dried, then at 80 ° C.

Yield 80.4%, P content 0.15%, N 12.22%, start of decomposition, the product is completely soluble in ethyl acetate and acetone.

Example 3. A portion of the NC (0.5 g) is treated with a solution of POCls (0.1 M) in hexane (1:20) for 15 minutes, wring out, the product is washed with hexane.

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five

five

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30% ethanol (1M and milk until neutral and negative for C1, dried at 80 C.

The content of P is 0.13%, N 12.29%, the beginning of decomposition is 220 C. The product is soluble in ethyl acetate, acetone.

Example 4. A sample of NTS (0.5 g) is placed in a flask and treated with a solution of POC1, (0.1 M) in hexane (1:20) at 20 ° C for 2 hours, drained, washed with hexane, 50% ethanol and water.

The content of P is 0.16%, N 12.09%, the beginning of decomposition is 235 ° C, the product is completely soluble in ethyl acetate, acetone.

In the known method, the temperature for the onset of decomposition of modified nitrates does not exceed 200 s (190 ° C for unmodified nitrates); 26-40 M acylation mixture per 1 mole of cellulose nitrate is used for modification.

Claims (1)

Invention Formula The method of modifying cellulose nitrates by treatment with an acid chloride, which is such that, with the aim of reducing the flammability of the target product while maintaining the degree of substitution of nitrate acid and reducing the consumption of acid chloride, phosphoric acid chlorohydride in the amount of 0.05 is used as the latter. 0.1 mol, per 1 mol of the nitrate unit cellulose, and the treatment is carried out for 0.25-3 hours at 20-40 ° C in hexane.