SU1684385A1 - Method of producing paper pulp - Google Patents

Description

one

(21) 4705566/12

(22) 06/15/89

(46) 10/15/91. Bul №38

(71) Ural Forestry Institute. Leninsky Komsomol and Central Paper Research Institute

(72) G.I.Maltsev, A.Ya.Ageev B.N. Driker, V.S.Sobolev, Yu.V.Kuznetsova, A.M.Gofman, L.A.Kozlov, M.T.Ivanov and T .P Awl

(53) 676.49 (088.8)

(56) USSR Copyright Certificate Ms 711219, cl. D 21 D 3/00, 1977.

(54) METHOD OF PREPARING THE PAPER MASS

(57) The invention relates to the pulp and paper industry and allows us to increase the mechanical strength of the paper while increasing the retention of the filler in the paper pulp. Rosin glue, kaolin and chemically treated coagulant are introduced into the suspension of ground sulphate bleached pulp. After stirring, the resulting mixture is neutralized with sodium hydroxide solution to a pH of 7.2-7.7. Chemical treatment of the coagulant is carried out with sodium salt of nitrilotriphosphonic acid or sodium salt of hydroxyethylidene diphosphonic acid in the amount of 1.6-2.5% of the mass of dry coagulant. Aluminum sulphate or aluminum alum is used as a coagulant. 3 hp f-ly 2 tab.

The invention relates to the pulp and paper industry and can be used in the manufacture of base paper for technical types of paper, for example, for self-copying paper and for other sized sized paper.

, / Invention - increase.) Ches (fy paper strength with simultaneous increase of filler retention in paper pulp.

SUMMARY OF THE INVENTION The essence of the invention is that in a method for producing paper pulp, including chemical treatment of coagulant based on an inorganic aluminum salt, adding to suspension a bleached sulphate pulp filler with a kanifikol glue and chemically treated coagulant, mixing the resulting mixture and then neutralizing it with hydroxide hydroxide. sodium chemical

Coagulant treatment is carried out with sodium salt of nitrilotriphosphonic acid (NTF) or sodium salt of hydroxyethylidene diphosphonic acid (HEDP), and the mixture is neutralized to pH 7.2-7.7.

The use of the proposed compound in paper sizing allows the glue to be deposited in a neutral or weakly alkaline medium while simultaneously improving the consumer properties of the paper.

In the proposed method, the following components are used: bleached pulp sulphate (GOST 16762-82), gum paste from gum rosin (OST 13-114-84) of the following composition: resin acids 93-94 .; fatty acids 1-1.5; unwashed substances 6-7; aluminum sulphate (GOST 12966-85) ammonium alumina alum (OST

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95-28-79), sodium salt of nitrilotriposphosphonic acid (TU-6-02-1171-79), sodium salt of hydroxyethylidene diphosphonic acid (TU 6-09-20 13-78).

The proposed method is carried out as follows.

7-8% suspension of sulphate bleached pulp is milled in a roll to the degree of grinding 65 ° SR. Kaolin, rosin glue and chemically treated coagulant are added to the ground pulp. The chemical treatment of the coagulant is carried out by treating the 6% coagulant solution with a 0.4% aqueous solution of NTF or HEDP. After stirring, 1N is added to the mass. sodium hydroxide solution to pH 7.2-7.7. The result is a 1-1.5% suspension.

Specific examples of the production of paper pulp are given in table. one.

From the resulting paper pulp on the LOA-2 apparatus, the paper is ebbed, pressed and dried at 100-105 ° C. The result is a base paper for self-copying paper weighing 48 g / m2.

The resulting paper is tested in accordance with GOST.

Qualitative indicators of the resulting paper are given in table. 2

As can be seen from the table, 1 and 2, the proposed method allows to increase the mechanical strength, ash content and opacity of the paper.

Claims (4)

1. A method for producing paper pulp, including chemical treatment of coagulant based on an inorganic aluminum salt, introduction of a filler into the suspension of bleached sulphate bleached pulp, roasting glue and chemically treated coagulum, mixing the mixture and its subsequent neutralization with sodium hydroxide solution, characterized in that,; In order to increase the mechanical strength of the paper while increasing the retention of the filler in the paper pulp, chemical treatment of the coagulant is carried out with sodium salt of nitrilotriphosphonic acid or sodium salt of hydroxyethylidene diphosphonic acid in the amount of 1.6-2.5 from the mass of dry coagulant, and the mixture is neutralized to a pH of 7.2-7.7. 2. A method according to claim 1, characterized in that aluminum sulphate or alumina alum is used as a coagulant. 3. Method pop. 1, characterized by the fact that kaolin is used as a filler, 4. Method pop. 1, characterized in that the rosin glue takes in the amount of 1.5-2.0% of a weight of absolutely dry cellulose, about- o- n- 9- 100 ,five 0.08 U) 100 , , 0.09 (2) 100 2, C to five too 1.3 100 t, 7 100 2.0 ten SOUTH), 5 .five 0.1 (2.5) о.об 0, 1 (2) 0.09 (2) O.OL (1,) Kovva sizing degree, g / m M, H 11.2 1:, 5 11.3 11.2 11.i j 1Л1П 12100 12150 12200 .4201 11.2 4.4 11.9 12.5 79O 8.5 75 voo 7.9 7E 7820 8000 3.1 8, " 7 JOO 3.0 75 75 zoe 3, 48 o - 100 2.0 ten IOC 2.0 100 .4 100 2, no 2.0 ten 10 (1 2.0 ten Y. 2, f ten 0.06 ° table 2 .3 50 four 00 five 12.82ft, 9 909P9S50 p, 09.1 540С5) 5 8.21,1 6933 20.5 9100 5300 3.9 52 22 8200 525G i, 2 6P 6 19 In 150 I 200 5050 4.4 55 .300 h, I I .3 100RO . five 20P 4.2 60