Polyurethane Catalyst

Polyurethane catalysts are specialized chemicals that enhance the production of high-quality polyurethane systems. By reducing the activation energy required for chemical reactions, these PU catalysts enable faster reactions at lower temperatures. The polyurethane compound remains unchanged after the reaction, efficient and sustainable in the manufacturing process.


These PU catalysts play a crucial role in increasing reaction rates and managing gelling times. They help balance side reactions, particularly the water reaction, which is vital for controlling gas formation and foaming. This precise control leads to improved product consistency and performance in polyurethane applications.


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.


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


Polyurethane catalysts applications

◆ Coatings: PU accelerators improve the flow and cure characteristics of PUR and PIR systems, leading to enhanced coating performance and durability.

◆ Adhesives: Catalysts contribute to better adhesion properties, making them indispensable in the formulation of high-strength adhesives.

◆ Sealants & Elastomers: Polyurethane catalysts ensure better foam yield and ease of handling, which is crucial for effective sealing and elastomer production.

◆ Rigid Foam: In rigid foam production, catalysts help in achieving the desired cellular structure and physical properties.

◆ PU Flexible Foam: PU catalysts play a vital role in the creation of flexible foams used in various applications, from furniture to bedding.

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Organic Metal PU Catalyst
Organic Metal PU Catalyst
General purpose organic metal catalyst includes organotin catalysts TCAT series, organic bismuth catalyst BCAT Series, organic zinc catalyst ZCAT series, bismuth and zinc composite catalyst BX series and other organometallic catalyst, a total of four series PU catalyst.Organic Bismuth Catalysts (BCAT Series)◆ Environmental Compliance: Adhere to stringent international environmental standards.◆ Reaction Promotion: Effectively accelerate NCO/OH reactions while minimizing side reactions with water, reducing CO2 emissions compared to organotin catalysts.◆ Catalytic Activity: Exhibit high catalytic activity, albeit slightly lower than organotin catalysts.◆ Hydrolytic Stability: Prone to hydrolysis and inactivation in water, yet more stable than certain other catalysts.◆ Curing Profile: Organobismuth catalyst offers short flowable times initially with a gradual increase in strength later on.Organotin Catalysts (TCAT Series)◆ High Catalytic Activity: Known for their strong activity in hydrogen-isocyanate reactions.◆ Moisture Sensitivity: Ideal for moisture-curing systems, including polyurethane moisture curing and MS adhesives and sealants.◆ Foam System Application: Widely used as a gel catalyst in polyurethane foam systems.◆ Hydrolysis Resistance: Display higher stability in aqueous systems compared to standard metal catalysts.◆ System Compatibility: Compatible with various PU systems without compromising transparency.Organic Zinc Catalysts (ZCAT Series)◆ Environmental Protection: Meet the requirements of international environmental protection regulations.◆ Catalytic Activity: Generally weak and often used in conjunction with bismuth catalysts; special catalysts like ZCAT-T50 possess higher activity for standalone use.◆ Post-Curing Reaction: Typically weak promoters of post-curing; special catalysts like T50 enhance post-curing at a faster rate.◆ Flow Time Influence: Organozinc catalyst has a minimal impact on flow time.Bismuth-Zinc Composite Catalysts (BX Series)◆ Customizability: Formula ratios can be tailored to suit specific application requirements, offering flexibility in formulation.◆ Special Types and Metal Content: Capable of producing special types and varying metal content to support differentiated formulation needs.
Functional PU Catalyst
Functional PU Catalyst
Different from the general purpose catalyst, the functional eco-friendly catalyst is a series of polyurethane catalysts developed to replace organic mercury, lead and tin catalyst in various applications of polyurethane or to meet certain specific catalytic requirements according to the reaction characteristics and molding process of various isocyanates and active hydrogen:Series NameSignificant CharacteristicsApplication FieldCUCAT seriesIt is an eco-friendly metal catalyst that is insensitive to water and does not target and catalyze (weakly catalyze) the reaction between water and isocyanate, which is environmentally friendly and similar to the catalytic characteristics of organic mercuryAll fields, especially CASE fieldAUCAT seriesHydrolysis resistant, non foaming, eco-friendly, free of tinAll fieldsWCAT seriesOne component moisture curing catalyst, non foaming,  high activity at low temperatureCoating, adhesive, sealantFOCAT seriesInnovative eco-friendly catalyst for polyurethane foam; Catalytic activity is slow before and fast after; The catalytic activity in aqueous material is stable and does not fail; substitute for tin catalyst.Foam
Bubble-free PU Catalyst
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
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.
Moisture-cured PU Catalyst
Moisture-cured PU Catalyst
In view of the toxicity of T-12 (dibutyltin dilaurate) and its harm to the environment, the international environmental protection regulations have more and more stricter requirements on its limit, and it have been banned in some fields such as toys and clothing. In the fields where it can still be used, the prepared work should be done in advance for its elimination and substitution. T-12 also has some disadvantages, such as loss of catalytic activity at low temperature, foaming and cracking in application of elastomer.WCAT is a series of catalysts developed for many shortcomings of T-12, such as high toxicity, many bubbles, low activity at low temperature, etc. In the application of one-component moisture-cured polyurethane, WCAT has many characteristics, such as reducing viscosity, reducing bubbles, shortening curing time, greatly improving the curing speed at low temperature and fast curing in winter.
PU Foam Catalyst
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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HOT SERRCH TAGS
ZCAT catalyst, zinc catalyst, FOCAT catalyst, WCAT catalyst, tin free catalyst, anti-hydrolysis catalyst, AUCAT catalyst, non-foaming catalyst, CUCAT catalyst, bismuth catalyst, BCAT catalyst
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