Talking about papermaking antiseptic

Due to the development of the paper industry and the growing shortage of available resources, recycling of secondary fibers is used as an important means of saving resources at home and abroad. However, the forest coverage rate in China is small, and the application ratio of wood pulp in papermaking is much smaller than that in Europe and America. In Japan and other capitalist countries such as Japan, secondary fibers (waste from foreign countries) have become a major source of papermaking raw materials. Due to the large amount of water consumed by the papermaking industry, according to statistics, the water consumption per ton of paper in China is about 300m3. To save water, many manufacturers have begun to pay attention to the large amount of papermaking white water (above 70% recovery) to reduce production costs and reduce environmental pollution. The recycling of waste paper in the breeding of a large number of bacteria, which will inevitably bring a large number of bacteria into the paper machine production system, it is easy to cause paper pulp and white water flowing through a variety of equipment and piping system in the formation of slime. In addition, with the increasing number of papermaking chemicals, the gradual promotion of neutral sizing will make it easier for the papermaking system to reproduce microorganisms than acidic systems. In coating paper processing, coatings contain starch and protein, etc. It is also easy to cause the proliferation of microorganisms. In this case, shut down cleaning can only temporarily inhibit the growth of microorganisms. Adding preservatives to the slurry and paint to inhibit or kill microorganisms is an important prerequisite for improving paper performance and ensuring production.

2, the harm of microorganisms

If the anti-corrosion method of the fiber in the slurry tank is inappropriate, anaerobic bacteria will grow in large quantities. These anaerobic bacteria produce large amounts of volatile fatty acids, such as propionic acid and butyric acid, and can also generate harmful and explosive gases such as hydrogen and hydrogen sulfide. At the same time, there are several important issues: reducing the use of fibers, contaminating the Internet with contaminated copper nets, blankets, etc., producing paper spots such as spots and holes, and even causing broken ends, increasing dust and reject rates, and making quantitative differences in paper banners. Large, affecting the quality of finished products.

3, sterilization mechanism

In the production of effective preservatives to inhibit the pollution of the slurry, the mechanism can be summarized as: destroy and destroy cell structures, such as lysogens melt cell walls, phenol changes the permeability of the cell membrane, ethanol destroys the main components of the cell, such as protein, so that Protein deterioration; Interference with genetic mechanisms, making genetic changes difficult to reproduce; Interfere with the activity of internal cell enzymes.

4, the basic requirements of fungicides

(1) Efficient, rapid, broad-spectrum bactericidal and bacteriostatic ability enables cells to be killed in a short time or to lose their ability to grow and reproduce.

(2) It should have low toxicity, easy decomposition, and certain solubility. It will decompose under certain conditions after use. It will not cause or cause environmental pollution, and it will not cause any harm to users of the product.

(3) No irritating odor, no serious pollution to the environment, no adverse effects on operators.

(4) For microorganisms that have a longer period of time, bacteria will not lose their effect on drug resistance within a short time.

5, the development direction of preservatives

Research and development of preservatives should focus on environmental protection, high efficiency, low toxicity, and good biodegradability. The use of low-toxic environmentally-friendly bactericides does not represent non-toxicity and harmlessness, but also requires a certain cost, and physical methods can be used to avoid the above shortcomings, such as the use of slime dissolution method and slush deposition method.