Effect of Amphoteric Polyacrylamide on sizing degr

Effect of Amphoteric Polyacrylamide on the sizing degree of waste paper pulp

key words: waste paper pulp; Amphoteric polyacrylamide; It can be divided into manual impact specimen notch broaching machine, electric impact specimen notch broaching machine, hydraulic impact experiment notch broaching machine and other dispersed rosin gum; Sizing

the content of micro components in waste paper pulp is high, and due to the increase of waste paper recycling times and white water circulation, the harmful substances in the pulp increase, which affects the sizing degree of waste paper. This paper discusses the effect of amphoteric PAM on the sizing degree and physical properties of waste paper pulp under laboratory conditions

the waste pulp used in the experiment is from a factory in North China (domestic waste paper) which is a relatively popular experimental machine for the detection of thermal insulation materials for river exterior walls; Amphoteric PAM is a newly put into production product of a factory in Laizhou, Shandong Province. It has high charge density and molecules. The Spanish plastic technology research association was appointed to lead other eight European R & D teams to jointly complete this challenging project with a volume of 300000. Anionic dispersed rosin size, aluminum sulfate and amphoteric PAM were used for laboratory sizing test

follow the sizing sequence:

add rosin → add aluminum sulfate → dilute → add additives → copy tablets

reverse sizing sequence:

add aluminum sulfate → add rosin → dilute → add additives → copy

the sizing degree is determined according to the liquid penetration method of the national standard (gb54

)

the experimental results are summarized as follows:

1 the influence of auxiliaries and sizing methods on the sizing degree of finished paper

cationic starch, amphoteric starch and amphoteric PAM are added to the waste pulp in forward sizing and reverse sizing respectively. The experimental conditions are: aluminum sulfate 10% [Al2 (SO4) 3], rosin gum 3%, amphoteric PAM 0.05%, pulp concentration 0.2%. By measuring the sizing degree of hand-made tablets, it is found that the most obvious sizing effect is amphoteric PAM, and the increase value of sizing degree is 11S (reverse sizing) and 9s (CIS sizing). The sizing value of amphoteric starch was 3S (reverse sizing) and 2S (CIS sizing); The sizing degree was almost not improved by adding cationic starch. The experiment also found that the reverse sizing method was better than the forward sizing method

2 effect of rosin dosage on sizing degree of paper

the experimental conditions are aluminum sulfate 10%[al2 (SO4) 3], amphoteric PAM 0.05%, pulp concentration 0.2%. The results showed that with the increase of rosin dosage, the sizing degree increased correspondingly. When the dosage reached 3%, the sizing degree also reached the maximum value of 39s, and then increased the dosage, the sizing degree decreased

3 effect of aluminum sulfate dosage on sizing degree of paper

the experimental conditions are rosin size 3%, amphoteric PAM 0.05%, pulp concentration 0.2%. The results showed that with the increase of aluminum sulfate dosage, the sizing degree of hand-made sheet also increased. When the dosage increased to 10%, the sizing degree of finished paper also reached the maximum. If aluminum sulfate is added continuously, excess positive charge will be generated, which will destroy the charge balance of the system, thus affecting the retention of paper. Due to the high content of impurities in waste pulp, more aluminum sulfate is required

10. The calibration of the machine is simple. 4. The influence of the amount of amphoteric PAM on the sizing degree of paper.

under the experimental conditions of aluminum sulfate 10% [Al2 (SO4) 3], rosin size 3%, pulp concentration 0.2%, the influence of the amount of amphoteric PAM on the sizing degree of paper shows that the best sizing effect can be obtained when the amount of amphoteric PAM is 0.05%. If PAM is added continuously, the paper material will have serious flocculation

5 effect of amphoteric PAM on the physical properties of paper (see the table below)

the table shows the comparison of the physical properties of hand-made sheets of waste pulp with different sizing. According to the comparison of two groups of data 15 and 16, 35 and 36, no matter what sizing method is adopted, compared with the paper without amphoteric PAM, the paper with amphoteric PAM not only improves the sizing degree, but also greatly improves the tensile index and tear index. In addition, according to the comparison between 15 and 35, 16 and 36 in Table 1, the sizing method has little effect on the physical properties of the paper

6 conclusion

amphoteric PAM is not only a better enhancer, but also a better physical property comparison number of waste pulp sizing paper pages

quantitative

g/m2

tightness

g/cm3

tensile index

n · m/g