SU887676A1 - Composition for treating a fibrous mat - Google Patents

Description

filtering, washing and drying burn 105-120 ° C.

The fibrous layer is treated by introducing the said composition based on an aqueous suspension of alkalulose microcrystallites with a concentration of 0.4–12%, which plays the role of an advising substance, which will be facilitated by subsequent stress reduction and drying, which is done according to the usual tech- nology.

The bonding of fibers in the layer occurs due to the highly developed and uniformly accessible surface of alkalulose microcrystallites having a high ability to form a network of hydrogen bonds, as a result of which microcrystallites introduced into the interfiber space of the fibrous layer during the subsequent increase in its co-activity in the processes of lresovain and The substances increase not only the strength of hydrogen bonds and the number of strong interfiber bonds in the layer, but also allow for the formation of a material with a closed page. Keturah filling voids .mezhdu fibers and subtends therein large iropbi.

The proposed composition does not contain coordinating substances, has a neutral pH of 7, and physiolol is harmless.

Example 1. Semi-composition.

1) Cellulose microcrystallites are obtained by hydrolysis of sulphate or sulphite cellulose with a solution of 1H. hydrochloric acid at 70-80 ° C, followed by separation of the white powder by filtration, washing with and drying with known methods.

2) The composition is obtained by stirring the cellulosic micro-crystals with water until a creamy I.P. liquid forms a paste.

The resulting product is characterized by the following qualitatively pointers:

The degree of crystallinity 85-90% The degree of polymerization

EXAMPLE 2. Receipt of paper.

In .POL071NO from voloasan chloik, wood pulp, viscose pulp with fiber length from 20 to 60 mm or mixtures of fibrous materials are impregnated with a 0.4-12% aqueous suspension of cellulosic microcrystallites under vacuum 0.1-0.2 kg / cm, pressed and dried at 105-120 ° C using the best methods, obtaining paper.

Example 3. Getting paper.

The canvas, consisting of a mixture of viscose fibers from 20 to 60 mm long and sulphate unbleached wood dellulose in a ratio of 50: 50, is treated with a composition containing 0.4% of cellulose 1m, and crystallites with SP-230,. degree of crystallinity 90% and then get the paper according to others. Measure 2, and then it is tested by standard methods for mechanical strength.

The results are as follows:

gap: the length of the number of double kinks

bursting resistance

Example 4. Getting paper. The canvas, consisting of a mixture of viscose fibers with a length of from 20 to 60; Mm and sulphate "green pulp in the ratio

50: 50, treated with a composition containing 4.5% cellulose m. Microcrystallites with SP-230, a degree of crystallinity of 90%, and then get the paper according to example py 2, and then it is tested with standard

methods for mechanical strength.

The results are as follows:

bursting length 3400 m

number of double folds290

resistance to bursting4, 1 kgf / cm

PRI me R 5. Getting paper. The canvas, consisting of a mixture of viscose fibers with a length of 20 to 60 mm and wood unbleached sulphate pulp in a ratio of 50:50, is treated with a composition containing 12% cellulose, microcrystalline crystals with SP-230, crystallinity 90%, and then get the paper in example 2, and then it is tested by standard methods for mechanical strength .. The results are as follows:

burst length

number of double kinks

resistance to bursting

PRI me R 6. Paper retrieval.

The canvas, consisting of a mixture of viscose fibers DLAY from 20 to 60 mm and wood unbleached sulphate paper in a ratio of 50: 50, is treated with a composition containing 12% cellulose m: i, red steel with SP-100, the degree of crystallinity is 85% and then get (paper for example 2, and then it is tested by standard methods for mechanical strength. The results are as follows:

discontinuous for the number of double kinks

resistance to pressure

Example 7

Production of paper with a different web composition consisting of viscose fibers 20-60 mm long or 5 viscose fibers 20 to 60 mm long and sulphite wood pulp in a ratio of 50: 50, or from viscose fibers 20 to 60 mm long and sulphate tree

Physicomechanical

cellulose (50: 50) or from viscose and cotton fibers in a ratio of 50: 50, treated with a composition consisting of 12% cellulose microcrystallites with SP-230, a degree of crystallinity of 90%, and then paper is prepared and tested for mechanical strength by standard methods.

The test results are shown in Table. one.

Table 1 Paper Properties

In ta-bl. 2 Comparative data describing the physicomechanical properties of papers, obtained by the processing fibrous layer of the proposed and limiting (according to the prototype) compositions, are given.

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table 2

Claims (1)

Claim A composition for processing a fibrous layer containing cellulose microcrystallites and water, characterized in that, in order to increase the physical and mechanical properties of the finished material, it contains cellulose microcrystallites with a polymerization degree of 100-230 in the following ratio of components, weight. %; Cellulose microcrystallites' Water