SU755930A1 - Composition for surface treatment of paper - Google Patents

Description

The invention relates to the field of pulp and paper industry and relates to the production of coated paper, for example the basis of photographic paper.

Surface treatment of paper is carried out to improve its surface structure, * this increases smoothness, reduces absorption, increases mechanical strength, and with the introduction of an optical bleach, paper whiteness increases.

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To do this, use a composition based on polyvinyl alcohol, gelatin, synthetic latex, Ma-carboxymethyl cellulose salt, starch. The use of such compositions for the surface treatment of paper does not allow _{5 to eliminate one of the main defects - metallic inclusions.

The presence of metallic impurities in the paper based on results in the formation of the finished photographic paper or black bright dot, _m which reduces the quality of photographic paper, but with a substantial content of - marriage products.

This is especially important for the basis of photographic paper intended for the manufacture of photographic paper.

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for technical purposes, as it is usually made without prior baritization.

Metallic inclusions in paper pulp fall mainly from equipment, primarily from the headset of grinding machines and pulp.

A known method of eliminating metallic inclusions in paper pulp by using grinding machines made of stainless steel for the headset [1].

However, the manufacture of a stainless steel grinding apparatus requires a large economic cost and does not completely solve the problem of metallic inclusions in paper, especially having a large mass of a square meter.

Known composition for the surface treatment of fibrous material, comprising wt.%: Urea-formaldehyde resin 1-7; water-soluble polymeric binder (CMI) 3–7 and water — the rest [2).

However, the known composition for the surface treatment of fibrous material is not

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solves the problem of eliminating metal

inclusions from the surface of the paper.

The aim of the invention is to reduce the content of metallic inclusions in paper.

The goal is achieved by the fact that the composition for surface treatment of paper, containing urea-formaldehyde resin, water-soluble polymeric binder and water, contains ortho-hydroxyphenylimine diacetic acid in the following ratio of components, wt.%: Urea-formaldehyde resin 5-10.0; water-soluble polymeric binder 3-10; ortho-oxyphenyliminodiacetic acid, 0.01-0.1; . water - the rest.

As a water-soluble polymeric ₁₅ binder, the composition may contain: Ma-carboxymethylcellulose salt, polyvinyl alcohol, gelatin, starch, and polyvinyl acetate dispersion. To increase the whiteness of the paper, the composition may contain an optical bleach.

The elimination of metallic inclusions on the paper surface occurs due to the binding (masking) of metal ions in the sizing composition with ortho-oxyphenyl-aminodiacetic acid functional groups with the formation _of durable water-soluble complexes.

Example 1. Paper - the basis of photographic paper is treated from the surface with the composition, including, wt.%: Na-carboxymethylcellulose salt 3, urea-formaldehyde resin (KS — 11) 5, ortho-hydroxyphenylimine diacetic acid 0.01 and water 91.99. Paper processing is carried out on the sizing press.

A solution of ortho-oxyphenylaminoacetic acid is prepared as follows.

Mix the solution of 6% glacial acetic acid and a solution of 4% sodium hydroxide in the ratio of 1.4: 1. The total volume of the solution is brought to 2 liters. The solution is heated to 60 ° C and dissolved under stirring.

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30 g of ortho-hydroxyphenylaminoacetic acid. The concentration of the solution of ortho-hydroxyphenyl aminodiacetic acid is 1.5%.

The results of the test paper, processed according to example 1, presented in the table.

PRI mme R 2. Paper - the basis of photographic paper treated with the surface composition, including, wt.%: Polyvinyl alcohol 5; urea formaldehyde resin 10 .; ortho-oxyphenyliminodiocetic acid 0.05 and water 84.95. Paper processing is carried out on the sizing press.

The test results of the paper treated according to Example 2 are presented in the table.

Example Paper - the basis of photographic paper is treated from the surface with a composition comprising, in wt%: gelatin 10; urea-formaldehyde resin 10; ortho-oxyphenyliminodiocetic acid 0.1 and water 79.9. Paper processing is carried out on the sizing press.

The test results of paper treated according to example 3 are presented in the table.

Example! Paper - the basis of photographic paper is treated from the surface with a composition comprising, in wt%: starch 3; carbamide resin (KS — 11) 7; ortho-oxyphenyliminodiocetic acid 0.05 and water 89.95. Paper processing is carried out on the sizing press.

To increase whiteness, the composition may contain optical bleach.

The test results of the paper treated according to Example 4 are presented in the table.

PRI me R 5. Paper - the basis of photographic paper treated with the surface composition, including, wt.%: Polyvinyl acetate dispersion 6; carbamide resin KS-11 5; ortho-oxyphenyliminodiacetic acid 0.05 and water 88.95 .. Paper processing is carried out on the sizing press. The test results of the paper treated according to Example 5 are presented in the table.

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. Example Indicators Metal inclusions, pcs. ; Smoothness with Destructive force in the longitudinal direction when wet, kgf o Absorbed vaemost with full yo worker, g / m ² Example 1 6 116 2.4 60 Prototype 24 116 2.4 60 Example 2 2 127 2.4 52 * Control 18 125 3.0 52 Example 3 four 104 2.5 42 Control 20 104 2.45 42 Example 4 four 116 2.2 ⁵⁹ Control sixteen 115 2.15 60 Example 5 four 120 2.3 55 Control 18 118 23 55

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As can be seen from the table, when processing the paper with the proposed composition, the content of metallic inclusions (Fe, C) decreased by 4 ^ -6 times. The remaining indicators of the paper remained at the same level, which indicates that the introduction of ortho-hydroxyphenyl-aminodeuxicic acid to the surface treatment paper has a positive effect on the quality indicators.

in paper, it additionally contains an aqueous solution of ortho-hydroxy-phenyl-aminodiacetic acid in the following ratio of

Claims (1)

Claim 40 Composition for the surface treatment of paper containing urea-formaldehyde resin, water-soluble polymeric binder and water, characterized in that, in order to reduce the content of metal inclusions com, weight. / about: Urea formaldehyde pitch 5-10 Water soluble polymer binder 3-10 Ortho-oxyphenyliminodiacetic acid 0.01-0.1 Water Else.