Method of production of paper pulp

FIELD: textiles, paper.

SUBSTANCE: method comprises grinding the cellulose to a given degree of fineness and preparing suspensions of the ground cellulose and calcium carbonate. Then, the suspension of calcium carbonate is processed by the modifying agent, the suspensions of fibre and the processed calcium carbonate are mixed to obtain the fibre mass. The fibre mass is added to the sizing component and the auxiliary material to produce paper pulp. The modifying agent is used as nanopowders of oxide or hydroxides of aluminium or their mixtures with its amount of 0.5-2.5% by weight of calcium carbonate. The sizing component is used as alkyl ketene dimer, and the auxiliary material is used as cationic starch in an amount of 0.3-0.4 and 0.5-0.7%, based on dry substance in the paper pulp respectively.

EFFECT: increase in degree of retention of filler.

2 cl, 5 ex, 1 tbl

 

The invention relates to the manufacture of filled paper types for printing, for example printing, offset, newsprint, and can be used in the pulp and paper industry.

In the manufacture of filled paper as fillers are calcium carbonate, titanium dioxide, kaolin, talc, bentonite and many other inorganic materials. In patent literature notes the use as fillers in paper pulp pre-treated colloidal inorganic particles of compounds such as oxide and aluminum hydroxide (WO 2004/092482, D21H 17/69, publ. 28.10.2004).

You can also use crushed aluminum hydroxide Al(Oh)3as the filler in the paper pulp, and as a component of the coating composition (US, 2010/0175844, D21H 19/36,17/69, publ. 15.07.2010). Al(Oh)3combines well with other inorganic compounds, such as calcium carbonate used for these purposes.

A method of producing a pigment comprising particles of titanium dioxide coated particles of phosphate or aluminum oxide (RU, 2008135143, SS 1/36, publ. 10.03.2010). Modification of titanium dioxide mentioned particles is carried out by chemical precipitation, and the thus obtained pigment propose to use as a component in the coating composition�.

The closest analogue of the proposed invention is a method of manufacturing a printing paper by making paper pulp using as a filler of calcium carbonate and forming from it a paper web (Pat. RU №2213822, D21H 23/02, publ. 10.10.2003). In the method paper weight was prepared as follows. Prepare 2,2% suspension of cellulose with a degree of grinding from 26 to 280SHR, a suspension of chalk and a 2.2% solution of Na-carboxymethylcellulose (Na-CMC) with a modifying properties. This solution is treated with a suspension of calcium carbonate by introducing into the suspension and stirring the mixture for 60 min. Then it serves a mixture of salts of Na2SO4and NaCl and receive a suspension of the modified calcium carbonate. Na-CMC expend in the amount of 2.5 to 5.0% by weight of calcium carbonate.

Treated as a modifying agent to the slurry of calcium carbonate mixed with a suspension of cellulose fibers based on its consumption of 180 kg per 1 ton of paper and get filled with a fibrous mass.

It as a sizing agent is administered modified rosin glue, and, as auxiliary substances, alumina. From the resulting pulp molded paper web is dried it and get the full paper.

The disadvantages of this method are the low degree of uderzenie� filler in paper.

New technical result from the use of the invention is to increase the degree of retention of the filler.

These results are achieved in that in the method of producing filled paper pulp for the manufacture of different kinds of paper to use as filler of calcium carbonate, comprising grinding the pulp to a given degree of grinding, the preparation of suspensions of milled cellulose and calcium carbonate, the processing of a suspension of calcium carbonate as a modifying agent with the quantity of 0.5-2.5% by weight of calcium carbonate, the mixture of fiber suspensions and treated calcium carbonate with pulping, adding a sizing component and auxiliary substances with obtaining paper pulp according to the invention as a modifying agent used nanopowders oxide or of aluminum hydroxides or their mixtures, as a sizing component used dimer of alkylbetaine, and as auxiliary substances - cationic starch in amounts of 0.3-0.4 and 0.5-0.7% based on the dry substance in the paper pulp, respectively. The amount of the modified calcium carbonate in the paper stock in the calculation of its dry matter is 18-22%.

The method is as follows.

In a container of water with stirring serves Carbo�at calcium in the amount of 180-190 g/DM 3and get the suspension of the filler. It is stirred for 20-40 minutes and then stirring it serves the modifying agent in the form of nano-powders of aluminum oxide, of aluminum hydroxides or their mixtures with the quantity of 0.5-2.5% by weight of calcium carbonate and from 5 to 25 g per 1 kg of calcium carbonate in the tank and get the suspension modified calcium carbonate. After additional stirring for 10-15 min it is pumped to the feed tank equipped with a stirrer.

A mixture of bisulfite pulp, consisting, for example, from 70 to 80% coniferous and 20-30% leaf fibres at concentrations of 2.2-2.5% is milled to the consistency of grind 23-290SHR and sent to the pool of known volume.

Next, the slurry is mixed at their predetermined ratio and get the dispersion of the fiber. Into it while stirring consistently administered component sizing emulsion dimer of alkylbetaine in the amount of 0.3-0.4% and the auxiliary substance in the form of cationic starch in an amount of 0.5 to 0.7% based on the dry substance in dispersion and receive a paper weight.

From this mass in a paper machine the paper web is formed of 80 g/m.

The following examples illustrate the capabilities of the proposed method.

Example 1. In the mixer of a given size are prepared suspension of calcium carbonate with its concentration�th 185 g/DM 3. It serves a nanopowder of aluminum oxide in the amount of 25 g per 1 kg of calcium carbonate and receive a suspension of the modified filler.

Preparing a suspension of cellulose fibers, ground to the fineness of grind 260FR.

Both dispersions, given their ratio are mixed, the resulting mixture was added an emulsion of a dimer of alkylbetaine and cationic starch in amounts of 0.3 and 0.6 wt.% accordingly, based on dry substance of the mixture and get a paper weight. The content of calcium carbonate and aluminum oxide in the amount of approximately 18% based on the mass of solids.

Example 2. Unlike example 1, a suspension of calcium carbonate is prepared with a content of 180 g/DM, it injected a nanopowder of aluminum hydroxide in the form of boehmite in an amount of 5 g per 1 kg of calcium carbonate. Cellulose is milled to 290FR.

Both dispersion at a given quantitative ratio are mixed, the resulting mixture was added an emulsion of a dimer of alkylbetaine and cationic starch in an amount of 0.4 and 0.5%, based on dry substance of the mixture and get a paper weight. The content of calcium carbonate and boehmite is 22% based on the mass of solids.

Example 3. Unlike example 1, a suspension of calcium carbonate is prepared with the content of 190 g/DM3it is administered nanopowder of aluminum hydroxide in the form of hydrogel�TA in an amount of 15 g per 1 kg of calcium carbonate. Cellulose fiber is milled to 230SHR and from them prepare a suspension. Both suspensions are mixed, a mixture of dimer emulsion of alkylbetaine and cationic starch in an amount of 0.35 and 0.7%, respectively, based on dry substance of the mixture and get a paper weight.

The content of calcium carbonate and hydrargillite is 20% based on the mass of solids.

Example 4. In contrast to example 1 as a modifying agent used nanopowder mixture of equal amounts of alumina and boehmite in its flow rate of 20 g per 1 kg of calcium carbonate. The degree of grinding of the pulp in suspension 260SHR. Both suspensions, given their ratio are mixed, a mixture of dimer emulsion of alkylbetaine and cationic starch in an amount of 0.4 and 0.5 wt.% in the calculation of the dry substance of the mixture and get a paper weight. The content of calcium carbonate and nano powder is equal to 19% based on the mass of solids.

Example 5 (by analogy). Prepare a suspension of calcium carbonate with a concentration of 185 g/DM3. Prepare a 2.2% solution of Na-carboxymethylcellulose (Na-CMC). Preparing a suspension of cellulose with a degree of grinding of the 260FR.

A solution of Na-CMC is treated with a suspension of calcium carbonate by mixing, followed by stirring for 60 min with formation of a suspension of calcium carbonate in a solution of Na-CMC. R�similarity of this modifying agent is 2.5% based on the weight of the filler. Next, to this slurry was added a mixture of equal amounts of sulfate and sodium chloride in the amount of the mixture of 2.8% by weight of solids of Na-CMC. The treated suspension of calcium carbonate is mixed with the pulp suspension, given their ratio, a mixture of modified rosin glue in the amount of 1.1% based on the weight of dry solids in the mixture, and aluminum sulfate as excipients and get a paper weight. The content of calcium carbonate is 18% based on the mass of solids.

Of paper pulp in all the examples is formed of paper weighing 80 g/m2.

Properties of the samples of the examples given in the table.

Influence on paper properties changes of the ratio in a mixture of softwood and hardwood pulp in the ranges shown above is not found.

79,6
Table
Parameter nameExamples of execution
12345
Weight of 1 m2gat 79.380,179,780,3
Breaking length, m50905210499050605020
Fracture strength, h. D. p.7068726566
Mass fraction of ash, %the 15.417,016,316,812,2
White, %95,195,094,394,394,7
The resistance of the surface to plucking, IGT, m/s2,32,22,02,12,2
The filler retention, %85,577,381,588,467,6

1. A method of producing filled paper pulp from�otopleniya different kinds of paper to use as filler of calcium carbonate, includes grinding the pulp to a given degree of grinding, the preparation of suspensions of milled cellulose and calcium carbonate, the processing of a suspension of calcium carbonate as a modifying agent, a mixture of fiber suspensions and treated calcium carbonate with pulping, adding a sizing component and auxiliary substances with obtaining paper pulp, characterized in that the modifying agent used nanopowders oxide or of aluminum hydroxides or their mixtures with the quantity of 0.5-2.5% by weight of calcium carbonate as a sizing component used dimer of alkylbetaine, and as excipients - cationic starch in amounts of 0.3-0.4 and 0.5-0.7% based on the dry substance in the paper stock, respectively.

2. A method according to claim 1, characterized in that the amount of the modified calcium carbonate in the paper stock in the calculation of its dry matter is 18-22%.



 

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23 cl, 17 ex, 18 tbl

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