Present Situation And Future Innovation Of Neoprene Adhesive

The adhesives have been developed rapidly since the advent of the last century in 50s because of their high quality, low cost, wide range of applications and strong applicability.

Later, it slowed down. The reason is the toxicity and flammability of solvents. People are worried about the harm and safety of adhesives.

Some developing countries, such as China, did not limit the harmful substances of neoprene adhesive until July 2002.

The current situation and development direction.

Since the implementation of the standards in July 1, 2002, there are rules and regulations, and the production enterprises are bound to stop doing whatever they want.

From no control to control is undoubtedly a great progress.

It is only the lowest market limit, not the environmental protection standard.

Conform to the trend of environmental protection, there is no "three benzene" chloroprene rubber, it seems to be environmentally-friendly, in fact, no "three benzene" is not necessarily harmless, may not fully comply with environmental protection requirements.

It should be noted that environment-friendly adhesives should be neither toxic to the human body nor pollute the environment. The two elements are both worthy of the name.

As for the green adhesive, the standard is higher.

The bonding effect is also good.

Environmental labeling product certification technical requirements (HBC18-2003) (adhesives) limit the harmful substances more strictly. No toxic organic solvents such as benzene, toluene, xylene or halogenated hydrocarbon can be added during the production process.

However, this environment-friendly neoprene adhesive is expensive because of its high price.

Because the GB18583 standard only stipulates the limit of harmful substances, but there is no requirement for bonding performance. It is not difficult to meet the requirements simply, but the adhesive property is low and the market will not recognize it.

There is no difficulty in reaching the standard and keeping the quality, but the rising cost and poor freezing resistance are the bottlenecks. Some enterprises have not used the GB18583 standard to limit the availability of chlorinated solvents, and use a lot of low quality and cheap 1,2 one or two chloroethane. Although the test is in line with the standard, the toxicity is very high. In fact, it is the toxic pfer of "three benzene" to the standard, and the harm can not be underestimated.

The amount of 1,2 one or two chloroethane in every ton of adhesive is as high as 300-400kg.

GB19340-2003 the standard for adhesives for shoes and bags, made strict provisions on the total amount of halogenated hydrocarbons and the amount of n-hexane, and can be referenced.

The result of our experiment is a clear example.

Up to the standard glue and containing 10% 1,2 one or two chloroethane, the solid content must be 18.5%, which is frozen at less than 14 14 degrees.

Toluene is slightly toxic and can only be used in limited quantities, and its dosage in the US and European regulations does not exceed 5%.

Annual output of neoprene adhesive

Up to now, the substitute adhesive with the same performance as solvent chloroprene adhesive has not yet appeared. Although SBS adhesive instead of a small part of neoprene adhesive, it can not be completely replaced because of its poor durability.

Moreover, the performance of domestic waterborne neoprene adhesive will increase to a practical stage. It will take a long time. Even on that day, the solvent chloroprene adhesive will coexist with water chloroprene adhesive for a long time.

Market economy is the survival of the fittest. Solvent chloroprene adhesive is superior in performance and cheap in price.

The unique advantages are sticky retention period, fast curing at room temperature, rapid strength development, high shear strength (see Table 2), good flexibility, temperature resistance 4O -80 C (177 C), good durability (indoor use 1020, outdoor 3-5 years).

Wide range of applications, can be bonded to a variety of materials.

Shear strength of neoprene adhesive

Solvent chloroprene adhesive, as long as the environmental pressure of solvents, when new development opportunities, a new way, friendly environment, improve performance, be eliminated is always avoided, old trees will also open new flowers.

     1.4、低质低价恶性竞争严重

Over the past two years, the price of crude oil has skyrocketed and chemical raw materials have risen fiercely, resulting in the spread of low-grade chloroprene adhesives in the market.

Some inferior products have deceived consumers in the name of "environmental protection".

The price of solvent is very large, and the price of the adhesive is reasonable. It is puzzling that the price of individual products is still low.

It is not hard to imagine that if we do not reduce the solid content and do not use high toxic and cheap solvents, we will produce low price products.

Low price competition is a vicious competition of mutual pressure and mutual destruction. It destroys the normal market order and makes more enterprises fight against the fierce low-end market. The result is a serious impediment to the development of neoprene adhesive.

     1.5、生产技术正在推陈出新

The production of neoprene adhesive is mostly small and medium enterprises, most of which are workshop manufacturers. They still use the manufacturing methods in the 80s of last century. They are obsolete, backward in technology, crude in equipment, too high in energy consumption, low in efficiency and low in quality.

Basically homogeneity, imitation and low-grade.

Whether it is rubber mixing or direct dissolution, most of which use a single feeding method, which seems convenient and time-consuming, but also affects the quality of products.

The solvent used in the traditional process is mainly benzene, and the primary feeding method has no drawbacks.

However, according to the GB18583 standard, the amount of toluene is less than 200kg per ton, and the rest should be acetic ether, cyclohexane, butanone, acetone, solvent gasoline and so on.

Considering the cost, the proportion of solvent naphtha is relatively large, and the old technology is still conservative. It is bound to be slow in dissolution rate, long in dissolution time and poor in solubility.

Especially in low temperature winter and spring seasons, the problem is even bigger. The neoprene adhesive has poor bonding effect and poor storage stability. The reason is neoprene is not completely dissolved.

It is gratifying to note that in recent years, some enterprises have improved greatly in scale, production environment and technology.

Shandong, a rubber adhesive company mainly composed of chloroprene adhesive, has a shady and green plant. The factory building is large and spacious and well ventilated.

The agitator has a reflux condensing device, no solvent evaporation, and the pipeline is pumped by metering and adding solvent. The adhesive is directly pumped into the storage tank to fill the filling machine with semi-automatic filling. The whole plant can hardly smell when it is running normally in addition to the chloroprene rubber material. It is basically clean production.

In addition, Guangdong, Shenzhen, Chengdu and other provinces and cities of chloroprene adhesive production enterprises mostly adopt high-speed shear production technology, dissolution is fast, time is shortened, only 4-5h, and the efficiency is very high.

1.6. Water nitrogen butadiene is significantly different from foreign countries.

Neoprene latex has been developed since the 80s of last century and has been successfully applied to water-based neoprene adhesive.

Its characteristics are non-toxic, environment-friendly, non combustible and safe, saving resources, representing the development direction of neoprene adhesive.

However, the water chloroprene adhesive is drying too slowly, and the adhesive needs to wait for a long time. The initial adhesive strength can not be compared with that of the solvent type, and the frost resistance is poor.

At the same time, the bonding effect of impermeable materials such as metals, plastics and rubber is not ideal.

The development of water-based chloroprene adhesive abroad is relatively early.

Domestic water-based neoprene is still in its infancy. It will take some time to produce products with good quality and low cost.

      2、氯丁胶粘剂的展望

The development of neoprene adhesive should also keep pace with the times, implement Scientific Outlook on Development, base on unremitting innovation, and thoroughly improve the solvent type neoprene adhesive, reduce pollution, save resources and environment friendliness.

Accelerate the development of waterborne neoprene adhesive, overcome difficulties in performance, and commercialization as soon as possible.

      2.1、采用先进生产技术 <