SU990927A1 - Filled fibrous material - Google Patents

Description

(St) PLATED FIBER MATERIAL

one

The invention relates to coated fiber materials - paper and cardboard, intended for the production of products with a high level of printing performance, and can be used in the pulp and paper industry.

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Fibrous materials with a coating coating are known that are resistant to the effects of a wetting solution during offset printing by introducing a kobamide resin or glyoxal into the coating suspension.

However, such coated materials have reduced gloss and surface strength after wetting.

Closest to the invention is a coated fibrous material consisting of a fibrous base and a coating coated on it containing a pigment.

dispersant, bond and structuring additive h.

As a structuring additive, coatings contain a soluble carbamide resin, in particular methylated polymethylol melamine and urea precondensate, in the following ratio of components, pigment 100, dispersant 0.66, binder plasticizer 0.0110, carbamide resin 1-5.

Known coated material has improved properties for

15 due to a certain degree of preservation of the surface strength in the state. However, the level of its printing and technical properties is insufficient due to the uneven structure of the coating, in which the distribution of the poorly soluble methylated polymethylol melamine of the urea base condensate is non-uniform. In addition, the reduced stability of aqueous solutions of carbamide resins causes deterioration of the properties of coating suspensions under the action of high shear stresses and during storage, which reduces the effectiveness of the binders and contributes to the formation of an oiled structure of the coating of the coated material. The aim of the invention is to increase the gloss and increase the strength of the surface of the material in the wet state. The goal is achieved by teM that in coated fibrous material consisting of a fibrous base and a coating coated on it containing pigment, dispersing agent, binder and structuring additive - water-soluble amino formaldehyde resin, the coating contains alumina-formaldehyde resin and resin resin and an adhesive resin. sodium or its mixture with lignosulfonate or sodium bisulfite with a modifier content of 0.2-1 mol per 1 mole of melamine in the following ratio Coatings, May, h Pigment100 Dispersant 0.2-0.4 Spray 10-18 Structural additive 0, Anionic melamine formaldehyde resin used in the coating of the coating dissolves in water indefinitely, its solutions are highly homogeneous and stable due to the long benzene ring containing chains with a large number of active sulfo groups that contribute to the dispersion of the pigments used. The viscosity of the 20 solution of the resin is preferably 10–20 cP. As a pigment, the coating of the coated coated mother ala may contain kaolin, its mixture with blanc,; chalk or satinweis. As a dispersant, the coating may contain polyphosphates, polyacrylates, or a mixture thereof. As a binder, the coating may contain synthetic latex; a mixture of them with polyvinyl alcohol, sodium carboxymethylcellulose starch, casein, and other known binders, and their combination. Used in paper and arton coating. The sulfonated mela-formaldehyde resin used in the coating of the proposed material is taken in the form of a powder or an aqueous 5 to 20 solution. EXAMPLE 1: A coating paper was applied to the base paper of bleached sulfite pulp and the weight of the pulp containing, in mac, a pigment (kaolin) 100, a dispersant (sodium polyphosphate) 0.4, a binding agent (butadiene styrene). carboxylated latex 85%, polyvinyl alcohol 10, sodium carboxyethyl cellulose sodium) (o) 17, melamine-formaldehyde resin with a content of 0.5 mol of sodium sulfonate per 1 mol of melami0, 8. on the produced paper is tested on the main indicators. The test results are presented in the table. Example 2. The base paper (TU 01-487-79) is applied twice (successively, the primer and surface layers have a coating coating containing, in hours, a): a) the primer layer is kaolin 90 pigment, blank fix 10) 1PO; dispersant {sodium polyphosphate 0.3; 90% butadiene styrene carboxylated latex, sodium carboxymethylcellulose 10) 17; melamine formaldehyde resin with a content of 0.5 mol of sodium sulfonate and 0.5 mol of lignosulfonate per 1 mol of melamine 0.5. b) surface layer - pigment (kaolin -90 ° 4, blanfix 10) 100; dispersant (sodium polyphosphate) O, .4) -binding agent (styrene butadiene latex 70%, casein 30%) 16; melamine formaldehyde resin with a content of 0.5 mol of sodium sulphonate and 0.5 mol of lignosulphonate per 1 mol of melamine 2.0. The paper produced was tested according to the main indicators. The test results are shown in the table. EXAMPLE 3- A coating paper was applied to bleached cellulose and wood pulp based on macadam: pigment (kaolin 90%, chalk 10% j 100; dispersant S polyphosphate 50%, sodium polyacrylate 50 0.2; binder (styrene-butadiene styrene latex 67%, starch 33 18; melamine formaldehyde resin containing 0.1 mol of sodium sulfonate and 0.1 mol of sodium bisulfite per 1 mol of melamine 2

The paper produced was tested according to the main indicators.

The test results are shown in the table.

PRI me R 4. A coating with a coating of: mds.ch is applied to cardboard (GOST). : pigment (kaolin) 100; dispersant (sodium polyphosphate 0; binder (styrene-carboxylated latex) 10} melamine-formaldehyde resin containing 1.0 mol of sodium sulfoanilate per 1.0 mol of melamine 6. The cardboard produced was tested according to basic indicators.

Test results are given in the table,

PRI mme R.5. For comparison, the coated material is prepared in a known manner. The conditions and coating composition are the same as in the example of the invention.

Coated fibrous material consisting of a fibrous base and a coating coated on it containing a pigment, a dispersant binder and a structuring additive — a water-soluble amino-formaldehyde resin, characterized in that the gloss of the material is increased and the surface of the material is wet. coating as aminere 1, with the difference that as a structuring additive I use methylated polymethylol melamine and an ergonomic precondensate

The paper produced was tested according to the main indicators.

The test results are shown in the table.

As can be seen from the table, the use of an amino-formaldehyde resin additive, sulfonated sodium sulfonate or its mixture with lignosulfonate or inorganic sulfonic acid salt ((bisulfite), 1, as a structural guideline allows to increase the surface strength of the coated material after wetting, as well as its strength and optical density of imprint by improving the structure of the coating layer ..

This will significantly reduce printing machine downtime for washing dust from rubber-fabric blankets, which accumulates during the printing process due to softening of the coating layer with a dampening solution.

The formaldehyde resin contains chalk amine ormaldehyde resin modified with sodium sulfonate or its mixture with lignosulfonate or sodium bisulfite with a modifier content of 0; 2-1 mole per 1 mole of melamine in the following ratio of coating components, May. h .: Pigmenttoo

Dispersant, 0,2-0, And Sv zukitsee10-18

Structuring additive0,5-679909278

Sources of information, 2. U.S. Patent No. 26l68l8

taken into account in the examination of cl. 428- 51, 1952.

1. The patent of France N 21b1 93.3. UK patent

cl. From 09 K 3/00, 1973.W 1391593, cl. C 3 P, 1975 (prototype)

Claims (1)

Claim Coated fibrous material consisting of a fibrous base and coated with a coating of pigment, a dispersant, a binder and a structuring additive is a water-soluble aminoformaldehyde resin, characterized in that, in order to increase gloss and increase the strength of the surface of the material in the wet state, coating as amino formaldehyde resin contains chalk * "amino formaldehyde resin modified with sodium sulfanylate or its mixture with lignosulfonate or sodium bisulfite containing I eat ¹ modifier 0 / 2-1 mol per 1 mol of melamine in the following ratio of coating components, May. hours: * ”' Pigment 100 Dispersant 0.2-0.4 Binder 10-18 Structuring additive 0.5 “6.