preface

With the deterioration of human living environment, reducing environmental pollution and protecting ecological environment has become a global common concern. Laws and regulations on environmental protection are becoming more and more strict. In the coating industry, no matter in production or application, there are pollution problems. Promoting the use of waterborne coatings is one of the best ways to solve this problem. As the main raw material of waterborne coatings, the waterborne resin process determines the development speed of waterborne coatings.

 

directory

Waterborne resin is an inevitable trend in the development of coatings

Waterborne of various resins and their application

Domestic paint market waterborne process

 

Problems faced by water-based resin development market

First, resin waterborne coating is the inevitable trend of development

Raw materials rise: in recent years, the price of crude oil has made the production cost of solvent-based coating enterprises increasing, more and more close to the cost of water-based paint, and some even more than the cost of water-based paint, and this trend is still continuing, more and more paint companies began to use water-based resin products.

Environmental protection and safety: solvent-based products have environmental protection and safety problems, toxic, harmful, flammable, explosive, health hazards, environmental pollution, easy to cause fire, etc., while water-based products do not have the above problems.

National Conditions: At present, China's rapid economic development, strong demand, coupled with low labor costs, attracted a large number of world-class enterprises to invest in China, known as the world's processing plant. Environmental requirements for export products create a platform for the application of waterborne paint.
Waterborne resin is an inevitable trend in the development of coatings

International situation: in Europe and the United States and other developed countries, the proportion of water-based resin is higher than solvent, industrial coatings and water-based proportion is bigger and bigger. Domestic is given priority to with solvent-based at present, on industrial coating, waterborne industrial coating still holds only about 11%. Developed countries today is the direction of our country's development, so water-based coating is bound to become the protagonist of coating.

Development of coating equipment: domestic coating equipment factory has been suitable for all kinds of water-based paint coating equipment, many of the original solvent based equipment can be slightly changed. Water-based coating equipment is more and more popular, many paint manufacturers in the design of new coating equipment, basically take into account the applicability of water-based coating.
Waterborne resin is an inevitable trend in the development of coatings
Technical progress to the development of water-based resin to provide guarantee, in Europe and the United States and other developed countries water-based coating has been very popular, its water-based technology has been relatively mature, domestic water-based resin started late, but in recent years the rapid development, after the accumulation of recent years, and foreign technology gap is also shortening.

 

Two, various resin waterborne and application status

Water-based acrylic resin

Waterborne alkyd and epoxy ester resins

Water-based saturated polyester resin

Water-based epoxy resin

Waterborne polyurethane resin

Water-based acrylic resin:

It is divided into emulsion polymeric acrylic resin and solution polymeric resin according to different water-based methods. This kind of water-based resin is the largest yield and most widely used in water-based resin

Emulsion polymerization: polymer emulsion caused by emulsification of emulsifying agent in water, mainly used in interior and exterior wall paint, wood paint, plastic paint and other industrial anticorrosive paint and finish paint, such as coil paint, etc.

Application features: good flow resistance, fast drying, poor luster and fullness, easy to produce bubbles in construction.

Solution polymerization: Initiation of polymerization into a polymer in a solvent. Through the introduction of a large number of hydrophilic monomers in the molecule neutralization into salt dispersed in water, mainly used to make amino baking paint, there are also some self-drying varieties used in wood and paper glazing.

Application features: transparent water-soluble solution, water dilution viscosity is not easy to decrease the construction of solid bottom

Waterborne alkyd and epoxy ester resins:

On the technical situation of this kind of resin, this seminar has another special lecture, here mainly talk about its characteristics and application, according to the self-drying system and baking system respectively.

Self-drying system: water-based anticorrosive coatings have been widely used, such as automotive chassis, steel structure and other industries have been quite mature application.

Characteristics: compared with solvent type, drying is slower, due to the polymerization resistance of neutralizer, oxidation cross-linking is not very effective. At present, many domestic self-drying alkyd and epoxy ester applications are baked at 80-100℃.

Baking system: this kind of resin is used for baking coating, which makes up for the deficiency of self-drying crosslinking, and can be used for protection and decoration of all kinds of metal.

Features: due to the oil contained in the molecules of this system, the wettability of pigment is good, the paint film has excellent luster and fullness, and the cost is low.
     
Water-based saturated polyester resin:

This kind of resin is also through the salt forming mechanism of water, applied in high-grade amino baking paint and coil coating

Features: this kind of resin features paint film with excellent hardness and processing properties, excellent weather resistance and anti-corrosion properties, this kind of product has been mass production, amino baking paint (electrostatic spraying) and coil coating are used

Application and Performance charts:

Waterborne epoxy resin:

There are three water-based methods: adding emulsifier, emulsifying epoxy main resin with amine curing agent, and introducing hydrophilic group on epoxy molecule. Overseas such resin was promoted in China a few years ago, but there is still a gap in drying time and final performance. In recent years, there are several professional waterborne epoxy enterprises in the application of two-component epoxy anticorrosive coatings has a considerable scale.

Domestic paint market waterborne process

Anticorrosive coatings
Domestic industrial coatings industry waterborne relatively early is some light anticorrosive coatings, such as automobile chassis (bridge, frame, water tank, fuel tank, etc.) and steel structure and other industries, in these industries has been nearly ten years of application, including spraying and immersion coating, the waterborne of these industries has been quite common, technology is becoming increasingly mature. The coating is mainly used in water-based alkyd and epoxy ester resin, which is mainly due to the water-based resin contains more polar groups, so that it shows better performance in anticorrosion.

Decorative paint

Early water-based coating gloss and fullness with solvent based products are more different, water-based coating is more applied in the bottom coating, with the continuous improvement of water-based resin technology and coating application technology, some manufacturers produce water-based decorative coating has been close to or reach the level of solvent based coating.

Automobile topcoat coating and other high-grade coatings waterborne

The waterborne coating of automobile starts from the primer, now the waterborne coating of domestic automobile bottom is very common. In the coating respect of finish paint, Europe and the United States and other developed countries have mature production lines in application. This kind of coating resin is mainly developed by a few large coating enterprises.
     

Problems faced by water-based resin development market

Coating after nearly 10 years of development, although from the resin technology to the coating application and construction technology have great progress, water-based paint market share is also increasing, but compared to developed countries, with the increasing environmental protection consciousness, the proportion of the total industrial coatings industry is relatively small, of course, there are many reasons, Here is just a technical description of the problems that need to be solved to develop the market:

Resin application technical service problem
Due to the complexity of water-based coating formula design more solvent formula, to prevent the paint recipe engineers use method and formula design, due to the resin for waterborne resin and coating, waterborne resin coating resin manufacturers must be applied technology into a certain energy, detailed and comprehensive guide paint manufacturers to develop more and better coating.

Construction technical service problems

Water-based coating construction parameters and solvent coating than also have a big gap, so paint manufacturers often need more construction services, try to overcome water-based coating in the construction process prone to problems such as hanging problems, bubble problems etc..

 

conclusion
With the continuous progress of waterborne technology, production equipment and process of continuous improvement and people's awareness of the change, can be predicted in the near future waterborne coating market will have a great growth.