CN103911900B - Soybean protein and filler turning property toughener are with the use of the method improving offset paper ash content - Google Patents

Abstract

A method for increasing the ash content of offset paper through the combined use of soybean protein and filler conversion enhancer, comprising the following steps: ①. Slowly add soybean protein into water at 50-70°C, stir thoroughly for 20-40min, and prepare a percentage concentration of 1 % solution; ②, add the soybean protein with a concentration of 1% obtained in ① into the bleached chemical mechanical pulp pulper according to the amount of 1-4kg/t pulp; ③, add soybean protein in ② to the bleaching The chemical mechanical pulp is added to the pulp mixing tank in a proportion of 20% by mass fraction; ④, the filler conversion enhancer is added to the diluted ground calcium carbonate according to the amount of 1-4kg/t pulp, and fully mixed; ⑤, the ④ The obtained ground calcium carbonate modified by the filler-transforming enhancer is added to the slurry obtained in ③. Compared with other methods, the production process of increasing the ash content of offset paper through the combined use of soybean protein and filler conversion enhancer has the advantages of high paper ash content, large paper thickness, paper stiffness, and high surface strength.

Description

The method of increasing the ash content of offset paper by using soybean protein and filler conversion enhancer in combination

technical field

The invention relates to the technical field of papermaking, in particular to a method for increasing the ash content of offset paper through the combined use of soybean protein and a filler conversion enhancer.

Background technique

At present, the general method to increase the ash content of offset paper is to use cationic starch and dry strength agent in combination. Because in the case of increasing ash content, cationic starch and dry strength agent can only ensure the tensile strength and tear strength of the paper remain unchanged. If the ash content If the increase is large, the thickness, surface strength, and stiffness of the paper will all decrease, resulting in a decrease in the quality of the paper.

Contents of the invention

In order to solve the disadvantages of the existing process, such as low increase in ash content and decrease in paper thickness, surface strength, stiffness, etc., the present invention proposes a production process for increasing the ash content of offset paper through the combined use of soybean protein and filler conversion enhancer.

Technical scheme of the present invention comprises the following steps:

①. Slowly add soybean protein powder into water at 50-70°C, stir well and evenly to form a solution with a concentration of 1% by mass;

②. Add the soybean protein solution prepared in ① with a concentration of 1% into the bleached chemical mechanical pulp pulper according to the amount of 1-4kg/t pulp;

③. Add the bleached chemical mechanical pulp with soybean protein added in ② to the pulp mixing tank at a mass fraction of 20%, that is, the pulp ratio (NBKP+LBKP):BCTMP=80:20;

④. Add the filler conversion enhancer to the ground calcium carbonate with a mass concentration of 10%-20% after dilution according to the amount of 1-4kg/t slurry, and mix thoroughly;

⑤. Add the ground calcium carbonate obtained in ④ to the slurry obtained in ③ according to the amount of 100-200kg/t slurry, mix well and enter the paper machine.

The above scheme is further preferably:

The filler transfer enhancer is cationic thermosetting resin, cationic high polymer or modified polymer silicon solution.

Compared with other methods, the production process of increasing the ash content of offset paper through the combined use of soybean protein and filler conversion enhancer has the advantages of high paper ash content, large paper thickness, paper stiffness, and high surface strength. Soybean protein and filler conversion enhancer are used together in offset paper, the ash content of the paper is increased by 3-4 percentage points, the ratio of bleached chemical thermomechanical pulp is increased by 3-5 percentage points, the thickness of the paper is unchanged, and the stiffness is increased by 20%. Surface strength increased by 10%.

Description of drawings

Fig. 1 is a production process block diagram among the present invention.

detailed description

With reference to Fig. 1, a kind of soybean protein and the method for improving the ash content of offset paper by cooperating use of filler transfer enhancing agent comprise the following steps: comprising the following steps:

①. Slowly add soybean protein powder into water at 50-70°C, fully stir (rotate at 300 rpm and stir for 20-40min), and evenly prepare a solution with a concentration of 1% by mass;

②. Add the soybean protein solution prepared in ① with a concentration of 1% into the bleached chemical mechanical pulp pulper according to the amount of 1-4kg/t pulp;

③. Add the bleached chemical mechanical pulp with soybean protein added in ② to the pulp mixing tank at a mass fraction of 20%, that is, the pulp ratio (NBKP+LBKP):BCTMP=80:20;

④. Add the filler conversion enhancer to the ground calcium carbonate with a mass concentration of 10%-20% after dilution according to the amount of 1-4kg/t slurry, and mix thoroughly;

⑤. Add the ground calcium carbonate obtained in ④ to the slurry obtained in ③ according to the amount of 100-200kg/t slurry, mix well and enter the paper machine.

Our company's 9# machine cultural paper production line applies this process, adding soybean protein solution to the BCT pulp pulper according to the amount of 0.8-1.2kg/t pulp, and adding 2-3kg/t filler conversion enhancer to the ground calcium carbonate feeding material tube, all materials are mixed and mixed and then enter the paper machine for subsequent operations. Compared with the offset paper obtained by the existing process (the existing process is the method of using cationic starch and dry strength agent together to increase the ash content), the offset paper produced is The ash content increases by 3%-5%, the paper thickness remains unchanged, the stiffness increases by 20%, and the surface strength increases by 10%. The ratio of BCT pulp is increased by 3-5%, and the comprehensive cost per ton of paper is reduced by 8.5 yuan.

Claims (1)

1. a soybean protein and filler turning property toughener are with the use of the method improving offset paper ash content, it is characterised in that, comprise the following steps:

1., by soybean protein powder slowly join in the water of 50-70 DEG C, stir and be made into the solution that mass percent concentration is 1%;

2., the soy bean proteinous soln that the percentage concentration joined in 1. is 1% is joined in bleached chemi-mechanical pulp pulping engine by the consumption that 1-4kg/t starches;

3., the bleached chemi-mechanical pulp adding soybean protein in 2. is joined in pond with slurry in the ratio of massfraction 20%, namely proportioning (NBKP+LBKP): BCTMP=80:20;

4., by filler turning property toughener join in the grinding calcium carbonate that the rear mass concentration of dilution is 10%-20% by the consumption that 1-4kg/t starches, fully mix; Described filler turning property toughener is cationic thermosetting resin, cation superpolymer or polymer-modified silicon solution;

5., by 4. gained join by the consumption that 100-200kg/t starches 3. in gained slurry through the modified grinding calcium carbonate of filler turning property toughener, after mixing, enter paper machine.