The development of structural adhesive industry-Iota

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News > Dynamic industry > The development of structural adhesive industry

The development of structural adhesive industry

Organosilicon compound has a history of 150, formal large-scale use in twentieth Century 60's.. From the point of view of history and basic research, there are still some gap between China and world advanced level, but the adoption of reform and opening up 30 years of accumulation, the gap continued to narrow. The rapid development of China construction industry, has become the building power, in the construction of the wall field, domestic silicone rubber market share will be more and more.

A, silicone structural adhesive is effects of wall materials life

1 structural silicone sealant why more attention?

The performance and life of structural silicone sealant is a topic within the industry is long-term concern, manufacturers, construction units, direct users anddesigners are concerned about. The rubber strip like sewing line of building components are small, flexible connection, and also bear the correspondingforce. Like sewing lines, the material consumption and the share of the cost is small, but crucial role.

The main building materials are inorganic, so the durability of the main material is generally guaranteed. But the silicone sealant in organic materials, durabilitythan inorganic material, so the structural silicone sealant should be the effect ofcurtain wall construction service life and structure safety control, control material.

The actual use of the adhesive properties of 2 silicone rubber structure how to deal with?

This involves two important indicators -- bond destruction area and bondingstrength, there is no doubt that we must guarantee the structure glue enoughadhesion and bonding durability. Not bonded with some typical performance:some glue us with not too much force a pull on the stripped down, and stripping surface is very smooth, not many rubber block residual, more is pulling strengthis enough, but the bond destruction area will exceed the standard.

How to solve these problems do not exist universal bonding? The glue, the current status of the industry should be such, standard materials such as glass,can guarantee the stick very well, profile anodic alumina standard, adhesive also has promise, but for various new surface treatment materials, bonding speed and effect may will be some difference.

So now the general way is in adhesive on targeted play some primer, primer andthe benefit is in the interface bonding conditions improve, avoid blindly in thecolloid added more unstable substances, the impact of the use of structural silicone sealant long-term. The primer is long time prove that a solution is veryuseful, we hope that the industry should have a consensus, don't bother. At the same time in the selection of new materials to balance the appearance and safety, the construction unit should fully understand and cooperate.

3 silicone rubber as a building material what advantages and disadvantages?

The structure of Si-O silicone rubber containing both organic and inorganicmoieties contain, this structure makes it has the properties of inorganic andorganic materials, especially in having excellent resistance to UV, performance ofheat resistance and aging resistance, so it is the building curtain wall has experienced the test of time first materials, has a history of 40 years in foreign countries, our domestic also has 30 years of history.

But the silicone rubber has shortcomings, it in acid and alkali resistance,hydrolysis resistance, chemical inertness and so on are smaller than C-C high molecular compound. So in a pH, metal catalyst under the action of the substance, also have water vapor cases (especially the product water vaportransmittance is high), silicone structural sealant can occur chemical reaction to generate a recession and aging properties.

What are the 4 structural silicone sealant aging performance?

Here is a keyword called chemical aging, physical aging is one aspect, chemical aging is one of the more the core. Aging performance is obviously variableadhesion and tensile strength, elongation, elastic recovery performance is poor,serious when colloid becomes very hard, lose their elasticity.

Aging performance also has the initial and long-term, polymer in agingdegradation process in the early period of the first is the core crosslinkdegradation, crosslinking density of this glue is dropped, strength decreased, but the polymer chain is still basic, so although his elongation increases, but therebound rate, aging has begun. But if the depth of aging, polymer has been slowly decompose, even evaporate, leaving more is packed, so flexibility is poor,will fly, hardening. So our country for both tracking and detection of curtain wallhas been put on the schedule of the industry.