Crosslinking modified type water-soluble solid polyacrylamide and application thereof

Abstract

The invention discloses crosslinking modified type water-soluble solid polyacrylamide. The water-soluble solid polyacrylamide is at least formed through chain copolymerization of six monomers including a nonionic monomer A, a nonionic monomer B, a crosslinking agent, a modified monomer, a cationic monomer and an anionic monomer. The problems that a water-soluble amphoteric polyacrylamide product has low molecular weight, low effective substance content, poor storage stability, short expiration date and the like are solved, and a product with higher molecular weight can be obtained and is highin effective substance content, low transportation cost and not prone to hydrolysis and mildewing. The invention also discloses an application of the crosslinking modified type water-soluble solid polyacrylamide in enhancement and / or modification of natural fiber materials or semi-synthetic fiber materials and can promote improvement of drainability and help strength improvement.

Description

technical field [0001] The invention belongs to the field of water-soluble polymer materials, in particular to a cross-linked modified water-soluble solid polyacrylamide and its application. Background technique [0002] As an excellent industrial additive, polyacrylamide can be divided into three categories according to the product state: aqueous solution type, emulsion type, and solid type (or powder type). According to its chargeability, it can be divided into cationic polyacrylamide, anionic polyacrylamide, nonionic polyacrylamide and amphoteric polyacrylamide. Amphoteric polyacrylamide has a wider range of applications because it contains both anionic and cationic groups in its molecules. Compared with polyacrylamide containing a single anionic group or cationic group, it not only has the comprehensive properties of both, but also has the characteristics of obvious anti-polyelectrolyte effect and wide pH adaptability. These properties and characteristics are The wide a...

AI Technical Summary

Problems solved by technology

However, the aqueous amphoteric polyacrylamide products also have the following problems: 1. The molecular weight is low, mostly between 300,000 and 600,000. If a product with a higher molecular weight is required, the viscosity of the aqueous solution will increase with the increase of the molecular weight, which will affect the product. Fluidity, and thus affect the use (liquid transportation and dissolution become difficult); the solid content of aqueous solution products is low, basically around 15%-20% in the market, and it is very rare to exceed 25%. If the content is increased, the viscosity will also increase. rise, affect the use of

2. Because amphoteric polyacrylamide liquid products contain a lot of water, they are prone to mildew and deterioration during storage. At the same time, the ester group in its molecular structure is easily hydrolyzed, resulting in changes in the molecular structure of the polymer and affecting the use effect.

3. Amphoteric polyacrylamide liquid products, due to low solid content, lead to high transportation costs and high packaging costs

4. The shelf life of amphoteric polyacrylamide liquid products is short, and the actual shelf life of most products is only three months, and the longest is no more than six months

[0006] In the above documents and patents, the prepared polyacrylamide is an aqueous solution type, with low content of effective matter, high transportation cost, and easy hydrolysis

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