Water based adhesive

Water-based adhesive refers to the water-soluble polymer dissolved into appropriate concentration of aqueous solution, or insoluble polymer dispersed into micro-particles (emulsion) in water with the help of surfactant in the general term of adhesives;In simple terms, adhesives made of materials that can be dispersed or dissolved in water are aqueous adhesives and are often referred to as water-based adhesives.

classification

Water-based adhesives can be divided into the following categories:

1. Aqueous solution, such as starch or dextrin, cellulose and protein natural adhesives, polyvinyl alcohol, phenolic resin, urea-formaldehyde resin, melamine resin and other synthetic adhesives;

2. Emulsion or water dispersion, such as PVAc, EVA emulsion, polyacrylate emulsion, epoxy resin emulsion, butylbenzene, nitrile, neoprene latex, polyurethane emulsion, etc.

3. Aqueous dispersion, such as water-based reclaimed rubber or butyl rubber, etc.

Application area

Automobile industry: With the development of automobile industry, the relationship between automobile and adhesive is more and more close. Firstly, the "three leaks" (air leakage, rain leakage and dust leakage) of the car are solved, and the comfort of the whole car is improved. Secondly, it not only plays the role of heat insulation and vibration reduction, enhancement of automobile structure and interior and exterior decoration, but also simplifies the automobile manufacturing process, and plays a more and more important role in automobile energy saving and consumption reduction, lightweight and extension of service life. Therefore, the amount of adhesive on the car is increasing.

Packaging industry: in our country's flexible packaging industry, the proportion of water-based adhesives is still relatively high. In the past, solve-based adhesives were used, but there are serious organic solvent volatilization and residue problems in solve-based adhesives, which not only pollutes the environment, but also has a variety of health and safety risks. Today, when the green wind swept through the whole packaging and printing industry, the industry turned its attention to more environmentally friendly water-based adhesives and solvless adhesives, especially the water-based adhesives gave high hopes.

Construction industry: in the internal structure decoration, there are many building materials in the process of manufacturing and production also need to be used. At present, in order to solve the problems of pollution and the key to the human body, the construction field has gradually begun to use more environmentally friendly water-based adhesives.

Footwear industry: With the human pursuit of environmental protection and health and environmental protection policy requirements, ool-based adhesive because of a large number of volatile solvents, with heavy odor, sensitization, environmental pollution, toxic components and other shortcomings, non-toxic, pollution-free, environmentally friendly adhesive in line with international standards is gradually becoming the mainstream products. Waterborne adhesive contains no organic solvent, no pollution, is the main product to replace the traditional solvent-based adhesive.

Precautions in production

1. How to improve productivity?

The additives were classified and weighed and placed separately to ensure easy access. Clean and organize the workshop in time.

Equipped with high pressure water gun, timely cleaning reaction kettle. Equipped with post-elimination tank and storage tank. Achieve semi-continuous production.

In the heat preservation stage to complete the production of the next kettle of pre-emulsion, the specific method is: if the continuous production, the pre-emulsification raw materials will be fully added and stirred; If semi-continuous production, only the water, emulsifier and main monomer are added and stirred evenly, and the additives placed separately are added until the start of production.

Increase filtration speed. The filter is not feasible. The simple and quick method is: the 200L double-mouth plastic bucket is vertically symmetrical, slightly tilted flat on the support and equipped with plastic valves at the bottom of the barrel mouth, the lower layer of steel mesh, the upper layer of nylon filter cloth; To achieve the purpose of increasing the contact surface to improve the speed.

2. What are the effects of stirring strength on emulsion production process and product quality?

Effect of stirring intensity on the diameter of latex particles: in emulsion polymerization, the larger the stirring speed, the larger the diameter of latex particles, and the smaller the number of latex particles. This is because in the emulsion polymerization and dispersion stage, when the number of revolutions is large, the monomer is dispersed into smaller monomer beads, and the surface area of monomer beads per 1cm³ of water is larger, and the amount of emulsification adsorbed on the surface of monomer beads increases. As a result, the number of micelles per 1cm³ water decreases, and the nucleation probability decreases, so the number of latex particles Np(1cm³ water) is reduced. When the initial monomer amount is constant, the latex particle diameter will increase.

Sinograce Chemical is mainly engaged in the business of water based adhesive and other auxiliaries other product series.Good materials, advanced production technology, and fine manufacturing techniques are used in the production of chemical liquids.

Order Method

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