Other chemical additives and effects in paper accessori […]
Other chemical additives and effects in paper accessories?
A: In order to meet the needs of some special applications of paper, various types of non-fibrous additives are often used in pulp or paper. According to their use, they can be roughly divided into the following categories:
1 wet strength agent. Wet strength agents are additives added to increase the wet strength of the paper, such as urea-formaldehyde resins and phenolic resins.
2 dry strength agent. Such as cationic starch, polyacrylamide and the like.
3 retention aids. Additives added to reduce the loss of fillers and fine fibers in the papermaking process, such as polyacrylamide, polyethylene oxide and polyethyleneimine.
4 defoamer. Used to eliminate foam in the papermaking process. Such as silicone oil, turpentine, tridecyl alcohol, tributyl phosphate, pentanol and octanol.
5 anti-water agent. It is mainly used in papers with high requirements for water resistance. Such as paraffin, metal soap, glyoxal, melamine waking resin and dimethylaminoethyl acrylate.
How to easily classify paper?
A: Paper can be divided into cultural paper, industrial paper, household paper and special paper according to the purpose. Cultural paper can be simply divided into non-coated paper and coated paper. Uncoated paper is called uncoated paper, such as newsprint, offset paper, xerographic paper, and writing paper. The coated paper is called coated paper, such as coated paper, calendar paper, and Asian. Glossy paper, glass cardboard, etc.