SU779479A1 - Composition for coating paper and cardboard - Google Patents

Description

I

The present invention relates to paper and paper production and can be used for the development of coated paper types I. cardboard.

A known composition for coated paper and paperboard, containing (in parts by weight): mineral pigment 100, the binder is a mixture of natural macromolecular compounds (casein, starch} 2-15 and copolymevinyl acetate with ethylene 3-25 1..

Use in combination with a natural high-molecular compound polymer copolymer provides a fairly high quality paper and cardboard. However, the composition indicated is not stable over time due to the possible hydrolysis and bacterial destruction of natural high molecular weight compounds.

In addition, the preparation of the composition is a complex multistep process (includes the stages of swelling, dissolving at high temperature, cooling). ,:

The closest analogue of the present invention to the technical essence and the achieved effect is a composition for paper melting and a toria containing (in mass parts): kao LIN 80-100; dispersant 0.01-0.5; copolymer of vinyl acetate with ethenbm 5-25 in the form of 40-60% aqueous dis5 Persia C2

This composition has enough-: MY stability properties during use and storage, Gives paper and cardboard high whiteness

To and smoothness, but will not allow to receive paper and a cardboard with high while,. resistance to tearing out wet abrasion, which reduces the quality of the finished printed product 15 II. The purpose of the present invention

, is an increase in the resistance of the material surface to wet abrasion.

20

This goal is achieved in that the composition for coated paper and paperboard containing pigment, dispersant, copolymer | of vinyl acetate with ethylene and water, according to the invention, additionally contains a mixture of methyl esters of N. — oximethyl derivatives of melamine at the following ratio of components (in parts):

thirty

Pigment100

Dispersant0,2-0,4

Copolymer of vinyl acetate with ethylene 15-25

A mixture of methyl esters

N - oxime. Strong pro, derived melamine 1-3

water 77-238. As the mineral pigment, the composition may contain kaolin, titanium dioxide, blanc fix, chemically precipitated chalk, satinweis, etc., commonly used in coating compositions.

As a dispersant, sodium hexameta or pyrophosphate, polyphosphates and other phosphates, as well as polyols of organic acids, for example acrylic acid, can be used.

A copolymer of vinyl acetate with ethylene may contain 5-50 wt.h. ethylene, preferably 8-15%. The copolymer is used in the form of a 40-60% aqueous dispersion.

In the proposed composition, the mixture of methyl esters of N-hydroxymethyl prodme melamine serves as a modifier of the surface of the particles of the mineral pigment and cellulose fiber of the paper, the base on which the coating is applied. The modification improves adhesion between the polymer and the surfaces of the pigment and cellulose fiber, which leads to an increase in the hydrolytic stability of the adhesive bond.

Use the specified mixture of methyl esters, manufactured by domestic industry according to GOST 9255-59 and having the technical name of methazine.

Introduction of methazine c. less than 1 May.%, does not provide the required level of increase in surface resistance to pulling and wet abrasion. The introduction of methazine in excess of 3% leads to the formation of oily stains on paper.

Example.4 5.6 g of water is mixed with 2 ml of lb% -i o solution of sodium dispersant hexametophosphate and, with intensive stirring, 109 g of bleached fractionated kaolin with 8% moisture content are poured. After careful dispersion, the kaolin dispersion is mixed with 1 g of metazine and, with stirring, small portions give 36 g of copolymer dispersions with a dry content; thing The paste is mixed again. After mixing, the pH of the paste is adjusted to 6.5-8.5 and filtered.

Table 1 shows the quantitative ratio of the components of the composition (in mass. 4) in terms of absolutely dry substances.

Example 2. A paste is prepared according to the technology described in Example 1, using components according to the ratios presented in Table 1 in the following amounts.

Water9 0.6m Kaolin bleached fractionated (8% Moisture) .109 g

Sodium pyrophosphate, 10%,

solution of 3 ml

Metazin2g

The dispersion of a copolymer with a solids content of 50% 40 g. Table 1 shows the proportion of 1 components of the composition (in parts by weight) in terms of absolutely dry substances.

Example 3. The paste is prepared according to the technology described in Example 1. The quantitative composition of the incoming components is as follows: Water 1208.8 ml

Sodium hexametaphosphate, 10% solution4 ml

Kaolin bleached fractionated with 8% nay moisture 109 g Metazine -3 g

Disperse copolymer 60% on 42 g

Table 1 shows the quantitative ratio of the components of the composition (in mass parts x) in terms of absolutely dry substances.

Example4. (reproduced by prototype). Chalking paste is prepared according to the technology described in Example 1, using the ratio of components shown in Table 1.

The quantitative composition of the incoming components is as follows:

Water. 149 ml

Sodium hexametaphosphate, 10% solution2 ml

Kaolin (10% humidity) 109 g Copers copolymer. dry matter content 50% 40 g

Table 1 shows the quantitative / ratio of components (in the mass of x) in terms of absolutely dry substances.

57794796 Compositional composition of coating pastes, wt.h.

Table

Kaolin bleached fractionated

Dispersant

a / hexametaphosphate

on three

b / pyrofsfat

sodium copolymer

with ethylene

Metazin Water

Coated paper samples using the compositions for chalk and in examples 1-4 are prepared as follows.

A ready coating composition in the amount of g / m is applied to the base paper in a laboratory setting.

Test results of coated samples of whiteness,% 86.0 86.0 Smoothness, with Vecco 140 150 150 Spray gun,% 41.8 40.5 Optical print density 1.75

100 100 100

0.4 0.2

0.3

25 20

20

2 3

1,122.3,238.45 180.30 77.4

Sample with raw coating is placed in a drying oven with temperature.

80-100 ° C and dried to a moisture content of 5%. Next, the samples are calendered on a laboratory calender in three passes. The test results of coated paper using the proposed

composition presented in table 2.

Claims (2)

T and l and c and 2 1,70 density of the water measured on SP-800, to. and after abrasion of the coated sample in it 86.0 86.0 GOST 7680-76 150 150 GOST 12795-67 41.0 41.0 The ratio of the amount of ink on the print to the number on the form with the thickness of the layer of paint on the form 1.5- 2.0 microns on Fogre 1.70 According to GOST 20807-75 with 1.75 thickness of the paint layer on the form 1.5-2.0 microns, //.-g:;., -.- 777947 Test results of coated specimens indicate that the introduction of methazine into the composition, posV9lit, increases the surface resistance to plucking by 30%, and the surface resistance to wet abrasion by 60%. At the same time, the printing and technical properties of the coated samples, expressed in terms of smoothness, ink transfer and optical density -V, -, - - of the print, are not reduced. OTftPTiaTifA. MO rumWatnf eT. The invention Composition for coating paper and paperboard containing a pygmyut, a dispersant, a copolymer of vinyl acetate with ethylene and water, in order to increase. 9-8 nor the resistance of the surface of the material to plucking, it additionally contains a mixture of methyl esters of N-hydroxymethyl chalk derivatives in the following ratio of components (in mass parts): pigment (yo; dispersant) 0.2-0.4 sepoli er vinyl acetate with ethylene 15-25; a mixture of methyl esters of N - hydroxymethyl derivatives of melamine 1-3 and IMJlbMOlA IIUUH water 77-238 .. Sources of information. taken into account in the examination. 1. Younger I 42-7649, 15 "l. 39 O 122, 1969.. 2. US patent 371b504, cl. 260-8, 1973 (prototype).