Paper weight

 

(57) Abstract:

Pulp used in the manufacture of high-grade papers, such as paper for copiers, paper base for photosensitive, and diazotype paper, paper for technical media, drawing, drawing, exercise book and writing paper. Paper pulp contains fibrous semi-finished product, the product of the interaction of rosin and monoether maleic anhydride with primary fatty alcohols C10-C18and casein ammonium, filler and coagulant. The proposed paper weight increases the degree of sizing bar method by 25-40 %, the absorbency under the one-sided wetting is reduced by 15-25%, destructive force in the dry state and the degree of retention of the filler is increased by 15-30 %. table 2.

The invention relates to pulp and paper production and can be used in the manufacture of high-grade securities (for example, paper for copiers, paper base for photosensitive, and diazotype paper, paper for technical media, drawing, drawing, exercise book and writing paper).

Known composition paper pulp, comprising a fibrous semi-finished product, Povedenie process dispersion obtained a 30% aqueous emulsion) and coagulant /1/.

A disadvantage of the known paper pulp is low hydrophobicity of the paper, as well as a low degree of retention of the filler in the finished product.

The closest of the present invention to the technical essence and the achieved positive effect is paper pulp containing, by weight.h.:

Fibrous semi-finished product - 100

The interaction product of rosin and monoether maleic anhydride with primary fatty alcohols C10-C18- 0,4-3,0

Filler - 4-20

The coagulant - 1,5-8,0

and in which the fibrous semi-finished products used coniferous sulphite bleached pulp, sulphate bleached hardwood pulp and sulphate softwood bleached pulp. In use as a filler kaolin, titanium dioxide, planfix. As rosin, modified rosin product is used, modified monoethylcellosolve ether maleic acid with primary fatty alcohols C10-C18. As coagulant use aluminium sulphate or alum /2/.

The disadvantage of this pulp is low hydrophobicity of paper and not a high degree of retention of the filler in structure increase the hydrophobicity while reducing consumption of water-repellent substances and increase the destructive efforts in the dry state and the degree of retention of the filler in neutral sizing of paper pulp (pH 6,5-6,9).

To achieve the objectives of the proposed paper pulp containing fibrous semi-finished product, filler, rosin modified product and a coagulant, and which, as modified rosin product contains the product of the interaction of rosin, monoether maleic anhydride with primary fatty alcohols C10-C18and ammonium Caseinate in the following ratio, wt.h.:

Fibrous semi-finished product - 100

The interaction product of rosin and monoether maleic anhydride with primary fatty alcohols C10-C18and ammonium Caseinate - 0,3-2,0

Filler - 4-20

The coagulant - 0,2-0,8

As the fibrous semi-finished composition may contain sulfite softwood bleached pulp, sulphate bleached hardwood pulp and sulphate softwood bleached pulp.

As filler paper pulp may contain chalk, kaolin, titanium dioxide, blantex, and as a coagulant is aluminum sulfate or alum.

Used in the proposed paper the weight of the rosin, monoether maleic anhydride with primary fatty alcohols C10-C18and ammonium Caseinate podnah resin acids 355% and has the General formula:

< / BR>
where

R1is the radical of a primary fatty alcohol C10-C18;

R2radical ammonium Caseinate General formula

+H4NCOO-CNH+4-(CH2)2-COONH+4.

The entity receiving the modified rosin product is that you first carry out a modification of rosin with monoufia obtained by the interaction of maleic anhydride with primary fatty alcohols C10-C18and then, after partial neutralization (40-50%) of 21% sodium hydroxide solution, the resulting adhesive composition is injected estimated number of prepared ammonium Caseinate. As a source of raw material for rosin, modified rosin product is used, maleic anhydride, primary fatty alcohols C10-C18, caustic soda, casein, ammonia water.

Before the introduction of the obtained adhesive composition in pulp exercise dilute it to a concentration of 3-5% water, heated to 60-70oC. the resulting aqueous adhesive emulsion is white and contains fine adhesive particle size of 0.3-0.6 μm, the pH is in the range of 9.2-9,4, viscosity B3-4 is 11 c.

Example 1 (invention). Pulp is prepared of the following composition, wt.h.:

Sulfite softwood bleached pulp ground to the 35oSR - 100

The interaction product of rosin and monoether maleic anhydride with primary fatty alcohols C10-C18and ammonium Caseinate - 0,3

Kaolin - 20

Aluminum sulfate and 0.5

From the obtained paper pulp manufacture of paper weighing 70g. The sizing of paper pulp are in a neutral medium at a pH of 6.5 to 6.9. Samples of paper experience by standard methods and determine the degree of sizing bar method, the absorbency under the one-sided wetting, destructive force in the dry state and the degree of retention of the filler.

The composition of the paper pulp are presented in table.1.

Properties of the paper are presented in table.2.

Other samples performed similarly to example 1, the aqueous modified product.

From table.2 shows that the paper made from paper pulp, containing a rosin-modified product of the interaction of rosin, monoether maleic anhydride with primary fatty alcohols C10-C18and ammonium Caseinate, have improved properties compared with the prototype. The degree of sizing bar method increased by 25-40%, the absorbency under the one-sided wetting decreased by 15-25%, destructive force in the dry state and the degree of retention of the filler is increased by 15-30%.

Paper pulp containing fibrous semi-finished product, filler, rosin modified product and the coagulant, characterized in that it as a rosin modified product contains the product of the interaction of rosin, monoether maleic anhydride with primary fatty alcohols C10-C18and ammonium Caseinate in the following ratio, wt.h.:

Fibrous semi-finished product - 100

The interaction product of rosin and monoether maleic anhydride with primary fatty alcohols C10-C18and ammonium Caseinate - 0,3 - 2,0

Filler - 4 - 20

The coagulant - 0,2 - 0,8 about

 

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