SU1601275A1 - Composition for surface treating of paper - Google Patents

Abstract

This invention relates to the pulp and paper industry and improves the deformation properties of paper. The composition for paper treatment surfaces contains a water-soluble binder 100 wt.h. and 15-100 wt.h. carbamide-formaldehyde pigment is the product of the interaction of carbamide with the bottom residue from the distillation of methanol from over-resin water producing urea-formaldehyde resin with a formaldehyde content of 4-10%. Starch and its modifications can be used as a water-soluble binder, NA is a carboxymethyl cellulose salt, polyvinyl alcohol, etc. The composition may also contain optical brighteners, viscosity regulators, dyes. 1 tab.

Description

The invention relates to the pulp and paper industry and can be used in the manufacture of paper with a surface treatment, such as writing, printing, document.

The purpose of the invention is to improve the deformation properties of paper.

SUMMARY OF THE INVENTION The fact is that a composition for surface treatment of paper containing a water-soluble binder and a urea-formaldehyde pigment, as a urea-formaldehyde pigment, contains the product of the interaction of urea with a vat residue from the rectification of methanol from suprammol water producing a urea-formaldehyde resin with the content in it formaldehyde resin content 4-10% in the following ratio of components, ma.ch .:

Water soluble binder-joo

Urea-formaldehyde pigment 15-100 Starch and its modifications, carboxymethylcellulose Na salt, polyvinyl alcohol, etc. can be used as a water-soluble binder.

The composition for surface treatment may contain optical brighteners, viscosity regulators, dyes.

The use of the proposed composition reduces the closeness of the paper surface and the packing density of the structural elements of the fibrous matrix. This reduces the shrinkage of the paper web and its deformation during fiber swelling.

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The indicated ratio of the binder and the hydrophilic product of the interaction of urea with the bottoms residue {ensures the optimum speed and depth of penetration of the bond solution into the base paper, which also weakens the process of relaxation of local tension; paper sheet.

I The presence in the product of the interaction of a carbide with a bottom residue of reactive groups increases the adhesion of the composition to the fibrous substrate and at the same time contributes to the structure and hardening of the surface film due to the possible formation of hydrogen and chemical bonds. This provides the necessary level of strength of the surface of the coated paper to plucking.

The high whiteness and low density of the product of the interaction of urea with the bottoms residue from the rectification of methanol from the over-resin water produced by urea-formaldehyde resin allows to obtain paper with a surface treatment at a stable optical quality,

Example 1. Composition for surface treatment, comprising the following components, mac.ch .: Starch100

Product inter

act urea with vat. methanol distillation residue

from the tar pitch

production of urea-formaldehyde resin content; it contains formaldehyde

: 4% 33.4

 applied to a paper web containing 70% bleached sulphate-sheet. air cellulose and 30% coniferous sulphate pulp at a semi-sizing sizing press. Coating weight 2 g / m, base paper mass 65 g / m

The composition for the surface treatment is prepared as follows. To 1 liter of the finished starch glue of 3% concentration, 10 g of the product of the interaction of urea with the cubic gostat is added and mixed to form a homogeneous mixture. The paper is dried and calendered and, after conditioning, linear deformation, twisting angle, strength of the paper surface to match are determined. whiteness.

Example 2. Composition for surface treatment, containing the following components, mac.ch .: Starch100

The product of the interaction of urea with the bottom residue from the distillation of methanol from the resin water of the production of urea-formaldehyde resin with a formaldehyde content of 6% 66.6 in it is applied to the same paper web as in Example 1.

The composition for surface treatment is prepared as follows. To the starch suspension with a concentration of 3%, 20 g of the product of the interaction of urea with the bottoms of the distillation of methanol from the resin water is added, the mixture is stirred and heated to 70-80 ° C for 20 minutes. Then cooled, the viscosity is measured on an EZ-4 funnel.

Example 3. Composition for the surface treatment of paper, including the following components, mac. Sodium salt of carboxymethylcellulose100

Product interaction- the composition of urea with a bottoms residue from the rectification of methanol from the over-resin water produced by urea-formaldehyde resin with 10% formaldehyde content in it 15 so-called paper web as in Example 1,

The composition for the surface treatment of paper is prepared as follows. To the prepared solution of the sodium salt of carboxymethylcellulose, a 10% suspension of the product of the interaction of urea with the residue from the distillation of methanol from the resin water is added. Content of sodium salt of carboxymethylcellulose is 2 g / l.

Example 4. The composition of the bottom surface treatment of paper, containing the following components, mac.h. Carboxymethylcellulose sodium salt 100 The product of the interaction of urea with the bottom residue from methanol distillation from over-resin water of production of urea-formaldehyde resin with

its formaldehyde content of 8% 100 is applied to the paper web as in Example 1.

The composition for the surface treatment is prepared analogously to Example 1.

Example 5 (control). The composition for the surface treatment of paper, comprising the following components, mac.h:

Starch100

The product of the interaction of urea with the bottom residue from the rectification of methanol from the over-resin water produced by urea-formaldehyde resin with a formaldehyde content of 6% 150 is applied to the paper web as in Example 1-.

The surface treatment composition was prepared analogously to example 2.

Example 6 (control). The composition for the surface treatment of paper containing the following components, wt. S

Sodium salt of carboxymethylcellulose100

The product of the interaction of urea with the bottom residue from the rectification of methanol from the over-resin water produced by urea-formaldehyde resin with a formaldehyde content of 10% 10 is applied to the paper web as in Example 1.

The composition for the surface treatment of paper is prepared similarly to the example-, RU 3.

Example 7 (known). The composition for the surface treatment of paper, containing the following components, May, hours;

Starch100

Urea-°

A dehydration pigment 600 is prepared and applied to the paper web as in Example 1.

The quality of paper with a surface treatment in examples 1-7 are shown in the table.

The evaluation of the deformation properties of the surface treated paper is carried out according to standard methods for determining curl upon single-sided wetting and linear deformation after treatment with water.

As can be seen from the table, the paper with the surface treatment based on the proposed composition has improved deformation properties, has a better planar stability. When the content in the composition for surface treatment is less than 15 mash. the product of the interaction of urea with the residue of low change in the deformation properties slightly. Increasing the content of the product over 100 May. leads to deterioration of these characteristics.

Claims (1)

Invention Formula A composition for the surface treatment of paper containing a 1st water-soluble binder and a urea-formaldehyde pigment, characterized in that, in order to improve the deformation properties of the paper, it contains as a urea-formaldehyde pigment the product of the interaction of urea with the bottom residue from methanol rectification from the tar water produced by urea-formaldehyde thermide with a formaldehyde content of 4-10% in it with the following ratio of the indicated components, wt.h,: Water-soluble binder 100 Urea-formaldehyde pigment 15-100 Linear deformation in transverse direction,% .2,1 2.2 1,9 2,0 2,6 2,5 2,7 Curl. at one side wetting, hail. 46 53-59 65 79 70 96 Surface resistance to strength. I / s2,4 2.3 2.2 2.1 1.9 1.7 1.9 Whiteness,% 84.1 81.5 81.4 81.5 81.5 81.3 81.5