Composite polyurethane adhesives are rapidly developing as environmentally friendly materials

Although China's polyurethane industry has a considerable scale, there is still a big gap compared with developed countries. The main difference is that the overall output of polyurethane is not large. In addition, the technical level is still lagging behind some developed countries.

First, the adhesive profile

The composite polyurethane adhesive industry is a sub-sector adhesive industry in the fine chemical industry. Adhesive refers to a variety of substances that can be bonded together by adhesion. According to the China Adhesive Industry Association's classification of adhesive products, it is mainly divided into the following six categories: pressure sensitive adhesives (belts), polymer emulsion adhesives, rubber adhesives, polyurethane adhesives, hot melt adhesives and engineering adhesives.

Second, the introduction of composite polyurethane adhesive

Adhesive refers to a variety of substances that can be bonded together by adhesion. Among them, the composite polyurethane adhesive refers to an adhesive containing a urethane group (-NHCOO-) or an isocyanate group (-NCO) in the molecular chain, and is mainly used for sticking two or more film-like or sheet-like materials having different or the same properties. Connected to form a new composite adhesive.

Classification and performance

There are many types of composite polyurethane adhesive products, and the classification methods are different. There are three common classification methods:

1 According to the use, it can be divided into: packaging, leather, textile shoes, printing, transportation, home appliances and electronic products, furniture and building materials, safety protection, composite polyurethane adhesive for new energy;

2 According to the characteristics can be divided into: ultra-low temperature, foaming type, anaerobic type, electrical conductivity, high temperature resistance, high barrier, anti-aging, anti-media, anti-slip agent composite polyurethane adhesive and other major categories;

3 According to different chemical principles, it can be divided into two types: reactive composite polyurethane adhesive and non-reactive composite polyurethane adhesive. Due to environmental protection and safe production of non-reactive composite polyurethane adhesives, its market share has gradually been replaced by reactive composite polyurethane adhesives this year.

performance

Reactive composite polyurethane adhesive refers to a composite polyurethane adhesive which contains two or more chemically active components and is cured and crosslinked during use. In addition to a wide range of applications, the adhesive has the following advantages:

High bonding strength;

High temperature resistance and wide design range;

Good health and biological performance;

High process adaptability;

Strong resistance to media.

Third, the application of composite polyurethane adhesive

Composite polyurethane adhesives are mainly used in packaging, printing, leather, textile shoes, transportation, home appliances and electronics, furniture and building materials, safety protection, new energy, tobacco and so on.

Fourth, the composite polyurethane adhesive industry overview

1 Since the reform and opening up, China's composite polyurethane adhesive industry has achieved sustained, rapid and stable development, and has formed a certain scale of production, but from the internal perspective of the industry, small and medium-sized composite polyurethane adhesive manufacturers are still the main body of the industry. According to incomplete statistics, there are hundreds of composite polyurethane adhesive production enterprises in China, most of which are still small and medium-sized enterprises, scattered in 28 provinces, municipalities and autonomous regions across the country, with annual sales income of more than 50 million yuan and independent technology. There are less than 10 main enterprises; and most small-scale enterprises have low production technology and management level, small output, and low product quality, which is difficult to cope with the challenges of modern production and market competition.

2Composite polyurethane adhesives as high-end products in the industry, although due to historical reasons such as late start-up time and relatively few R&D investment, the technical level of domestic manufacturers in a few products can not compete with international enterprises, but benefit from the application of new domestic materials. The continuous expansion of the field and the rapid development of the domestic economy in the past 10 years have maintained a strong momentum of development. In the past 10 years, production and sales have grown rapidly, with an average growth rate of 20%.

3 In 2009, when the domestic industrial added value increased by 11% compared with 2008, the output of composite polyurethane adhesives applied in the field of plastic flexible packaging reached 215,000 tons, still achieving a high growth rate of 26.5%. Its sales volume only accounts for about 5.5% of the total sales of all adhesives, but sales account for more than 8% of total adhesive sales, and it has an important position in the entire adhesive industry.

V. Main development trends of the industry

At present, the development of composite polyurethane adhesive industry shows the following major trends

1 application area expansion

As a high-end adhesive, composite polyurethane adhesives are widely used in traditional packaging fields such as food, pharmaceuticals, daily chemicals, precision instruments, instruments and electronics. In the oil printing, household appliances, building materials, transportation, new energy, safety The field of protection and other fields have also begun to be widely used.

2 industry concentration increased

In recent years, users have increasingly improved the quality, performance and environmental protection requirements of composite polyurethane adhesive products, and their awareness of the brands of enterprises in the industry has been continuously strengthened, and market competition has become increasingly fierce. The industry as a whole has shown a trend of scale and intensification, and the industry concentration has been continuously improved; enterprises with strong R&D and high technology levels have expanded rapidly.

3 specialization development

With the increasing demand for domestic composite polyurethane adhesives and the continuous innovation of application methods, tailor-made special polyurethane adhesives tailored to customer performance requirements will become the development trend of high-end adhesives in the future, which will be the research and development capabilities of composite polyurethane adhesive manufacturers. The level of specialization raises higher requirements.

4 import substitution trend

In recent years, in some composite polyurethane adhesive products, domestic enterprises have made great technological progress, and can gradually replace this part of imported products, and compete with Guoxi show giants, while downstream customers have a strong point of view from the perspective of reducing their own costs. The need to replace imported products has also stimulated the development and production of domestically produced products.

Sixth, the industry market competition pattern

The number of small enterprises in the composite polyurethane adhesive industry in China is large and scattered. These enterprises are mainly engaged in products with lower technical requirements and lower profit margins. Therefore, they are at the bottom of the industry pyramid, and a few master the independent knowledge of high-end composite polyurethane adhesives. Domestic companies with property rights mainly produce products with high technological content and high profit margins, which are in the upper middle of the industry pyramid; while international giants rely on their strong R&D capabilities and brand advantages to reduce production costs by establishing joint ventures or production bases in China. At the top of the pyramid, the market share of the highest-end products is monopolized and technological R&D has a clear competitive advantage.

As a high-end product in the industry, compound polyurethane adhesives are highly demanded by the company's R&D capabilities, technical level, and sales channels. They have long been monopolized by international giants such as Henkel, Dow Corning, and 3M, and many domestic industries. The required composite polyurethane adhesives are dependent on imported or joint venture products. Since the 1990s, domestic enterprises, scientific research institutes and other enterprises have gradually entered the independent research and development of products in this field. After years of technical accumulation, they have gradually developed independent knowledge on composite polyurethane adhesive products to replace imports. For the goal.

The field of plastic flexible packaging is one of the most important applications of composite polyurethane adhesives. After years of development, composite polyurethane adhesives for plastic flexible packaging have accounted for more than 50% of the production and sales of composite polyurethane adhesives, and have a mature market. In 2009, the composite polyurethane adhesive for plastic flexible packaging produced by Chinese enterprises reached 215,000 tons. At present, the market for composite polyurethane adhesives for plastic flexible packaging in China has formed the following pattern: the top-end products of multinational companies are vacant, the concentration of domestic enterprises is increasing, the segmentation is focused on, the market share is continuously expanded, and product import substitution is gradually realized.