Abstract
Poly(dimethyldiallylammonium chloride) (Other name: Polydadmac; PDMDAAC; PDADMAC) is a cationic polymer used in a variety of industries, including the paper industry. In the paper industry, it is often used as a retention aid, which helps to maintain an even distribution of fibers in the paper. It is also used as a sizing agent to help waterproof paper. Dimethyldiallylammonium chloride is also used to improve the strength and durability of paper.
In this article, we will discuss in detail the application and principle of action of polydiallyldimethylammonium chloride in the paper industry, as well as the related matters that need to be noted in the process of product application.
Introduction
Poly(dimethyldiallylammonium chloride) is a cationic polymer, polymerized from dimethyldiallylammonium chloride. It is a white to light yellow viscous liquid, easily soluble in water, non-flammable, strong cohesion, good hydrolytic stability, insensitive to pH changes. Poly(dimethyldiallylammonium chloride) has a high molecular weight, which gives it a number of properties that make it ideally suited for use in the paper industry.
These properties include:
The ability to bind to negatively charged particles such as fibers;
The ability to improve the wettability of fibers;
The ability to form a film on the surface of fibers;
The ability to cross-link fiber chains.
Applications in the paper industry
In the paper industry, poly(dimethyldiallylammonium chloride) can be used for a variety of purposes, including:
In retention aid applications, it can help maintain an even distribution of fibers in the paper. This is important because it helps prevent the paper from becoming brittle and fragile. It prevents negatively charged fibers from clumping together by binding to them.
In sizing agent applications, it makes the paper waterproof because it helps prevent the paper from becoming wet and fading when it comes in contact with water. It works by forming a film on the surface of the fibers, making it difficult for water to penetrate.
In reinforcing agent applications, it can be used to improve the strength and durability of paper. This is because it helps cross-link the fiber chains, making the paper more resistant to tearing and breaking. It does this by reacting with the hydroxyl groups on the fiber surface.
In dye carrier applications, it helps the dye to disperse evenly on the paper. This helps to improve the color uniformity of the paper. It does this by forming micelles, which are small aggregates of polymer molecules that can adsorb dye molecules.
In flocculant applications, it is used to remove suspended solids from paper water. This helps to improve paper quality by removing impurities. It does this by binding to the suspended solids and causing them to clump together for easier removal.
In addition to the above applications, poly(dimethyldiallylammonium chloride) can be used in other papermaking processes, such as
Coating: Can be used for paper coating to improve paper properties such as water resistance, strength and smoothness.
Fibrillation: It can be used to fibrillate paper, i.e., to break down the paper into fine fibers. This can be used to improve the absorbency of the paper or to make it more suitable for printing.
Sizing: Can be used to sizing paper, i.e. applying a substance to the paper to make it water resistant. This can be used to improve the performance of paper in applications such as packaging and printing.
Some other points to consider when using dimethyldiallyl ammonium chloride in the paper industry:
The amount of polydiallyldimethylammonium chloride used depends on the type of paper being made, the properties required and the cost.
Polydiallyldimethylammonium chloride can be used in a variety of papermaking processes, including wet-end addition, post-treatment and coating.
The use of dimethyldiallyl ammonium chloride is generally safe, but the manufacturer's instructions must be followed.
Summary
In conclusion, poly(dimethyldiallylammonium chloride) is a versatile polymer with a wide range of applications in the paper industry. It can improve the quality, performance and properties of paper in a number of ways.