Polyurethane Catalyst

In today's increasingly stringent environmental protection requirements, the limit requirements of organic mercury, lead and tin catalyst in various global environmental protection laws and regulations are getting lower and lower, even reaching the forbidden level that can not be detected. The selection of environmental protection catalysts to replace organic mercury, lead and tin catalyst has become a necessary choice for polyurethane manufacturers.

Guangzhou Yourun catalyst products are roughly divided into general purpose type and functional type, which fully meet the specific needs of various fields of polyurethane.

Bubble-free PU Catalyst
CUCAT series of Bubble-free PU Catalyst are ideal catalysts substitute for mercury catalyst in non foaming CASE field. Organic mercury catalyst has four unique characteristics: activity is slow before but fast after, no foaming and high performance. In particular, the characteristic of no foaming is the unique symbol of organic mercury. It is generally used in various isocyanate and active hydrogen systems, but the high toxicity of organic mercury makes it almost banned in the world. Years of research have proved that it is impossible to completely replace organic mercury with only one environmental protection catalyst. CUCAT series catalysts are developed by subdividing the application of organic mercury in various polyurethane systems. The catalytic effect of organic mercury can be achieved or even exceeded by selecting different CUCAT catalysts for different systems.Remarkable characteristics of CUCAT series catalysts: no foamingConventional catalysts in polyurethane industry  basically have a strong catalytic effect on the reaction between isocyanate and water, which is difficult to meet the requirements of no bubbles in most products of CASE field. At present, it is recognized that organic bismuth, whose catalytic properties are closer to that of organic mercury, can not avoid foaming, bulging and cracking even if a more stringent moisture control production process is adopted, for only controlling the moisture in raw materials is not enough, environmental factors, including trace moisture in the air, are difficult to control but have a great impact. Organic bismuth is still unsatisfactory, organic tin and amine catalysts that are more sensitive to water are even less applicable.CUCAT series catalysts are developed to meet the bubble free requirements of products in CASE field especially polyurethane elastomer. Different from the common moisture sensitive amine/tin catalysts, it does not catalyze (weakly catalyze) the reaction of trace moisture with isocyanate, so as to avoid generating CO2 bubbles. Under the working conditions of high temperature and high humidity, it can also effectively avoid the result of multi bubbles, cracking, bulging, peeling and lusterless, surface stickiness, etc.Taking CUCAT-DG02 catalyst suitable for MOCA curing as an example, its typical characteristics are very close to organic mercury. See the following charts for details:
Anti-hydrolysis PU Catalyst
Most organic metal catalysts such as bismuth, zinc and tin catalyst commonly used in polyurethane have hydrolysis failure in varying degrees. When premixed into aqueous raw materials, the catalytic activity gradually decreases until it is lost within a few days or even just a few hours. For example, the hydrolysis resistant tin catalyst with special structure has a stable storage period of only more than one month, and ordinary bismuth quickly hydrolyzes and loses catalytic activity within a few hours. As an important functional assistant, the hydrolysis failure of catalyst not only leads to inconvenient use, but also greatly hinders the innovation and development of polyurethane in some fields.After years of unremitting efforts, Yunrun has pioneered the development of AUCAT series of hydrolysis resistant eco-friendly organometallic catalysts, which can be used in all fields of polyurethane, such as foam, coating, leather, elastomer and so on. Typical characteristics are as follows:◆ Hydrolysis resistant. Stable storage in aqueous system, hydrolysis resistance, long-term storage, catalytic activity does not decay.◆ Targeted catalytic feature. It selectively catalyzes the reaction of hydroxyl and isocyanate, with high strength, no bubbles and high gloss.◆ Strong gel and high catalytic activity. Substitute for Tin catalyst, be used in all PU fields such as foam, coating, adhesive, PU leather, elastomer, etc. It is especially suitable for foam as strong gelling catalyst.◆ Eco-friendly and tin free. Meet the needs of toys, shoe materials, clothing, coatings and other export products.
PU Foam Catalyst
It mostly uses amine or the collocation of amine with strong gel metal catalyst T-9 (T-12) to product PU foam. However, tin has been strictly limited or tantamount to being banned in more and more export products such as toys, clothing, shoe materials and automobile interiors,etc. The only available eco-friendly strong gel metal catalyst without Tin is traditional organic bismuth. However, organic bismuth has many problems, such as low activity, short cream time, rapid hydrolysis and instability in aqueous material. The industry urgently needs more excellent eco-friendly metal catalysts.◆ Hydrolysis resistance without failure. It can be premixed into the aqueous material, which is conducive to the confidentiality of the formula and avoid the trouble and error of on-site addition; However, organic bismuth and tin catalyst will gradually lose their catalytic activity when added to hydrous A materials.◆ Eco-friendly, free of Tin, meeting VOC and TVOC requirements. Ensure compliance with harsh international environmental protection regulations such as REACH, ROHS, EN71-3, Standard 100 by OEKO-TEX, and meet the export requirements of foam such as toys, shoes and clothing.◆ Extend the cream time, increase the strength quickly, and do not collapse or shrink.Due to the catalytic characteristics of special thermally active metal catalysts, the flow time is not affected or extended.  It release strong gel catalytic activity at late foaming stage.◆ High catalytic activity and rapid increase the strength.The activity is higher than that of ordinary organic bismuth
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