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  • ●必看! [05-10] ● Must see! The relationship between waterproof coating thickness and waterproof life
  • ●现代建筑工地为什么要用【聚氨酯发 [03-21] ● Why use modern polyurethane construction site
  • ●如何在屋顶操作聚氨酯喷涂 [09-10] ● How to operate polyurethane spray on the roof
  • ●详解聚氨酯发泡机操作规程 [05-07] ● Detailed operation rules of polyurethane foaming machine
  • ●购买防水涂料需要重点关注的性能指 [05-10] ● The performance indicators that need to focus on when buying waterproof coatings
  • ●喷涂硬泡聚氨酯外墙防水保温施工流 [05-16] ● Waterproof thermal insulation construction flow for spraying rigid foam polyurethane exterior
  • ●哪些因素会影响聚氨酯发泡质量 [05-07] ● What factors will affect the quality of polyurethane foam
  • ●保温材料阻燃性能不合格成冷库安全 [05-05] Insufficient flame retardant performance of insulation materials to become safe in cold storage
  • ●怎么解决聚氨酯发泡机空泡现象 [05-08] ● How to solve the cavitation phenomenon of polyurethane foaming machine
  • ●聚氨酯保温材料行业未来发展前景可 [05-12] ● The future development prospects of polyurethane thermal insulation material industry are promising
  • ●异氰酸酯与聚脲弹性体性能的关系 [08-17] The relationship between isocyanate and polyurea elastomer performance
  • ●聚氨酯发泡机混合器中物料的流场分 [05-18] ● Flow field analysis of materials in mixer of polyurethane foaming machine
  • ●使用聚氨酯喷涂机白料时要细致什么 [05-10] ● What to be careful when using polyurethane sprayer white material
  • ●温度控制是解决聚氨酯发泡机的空泡 [05-08] ● Temperature control is to solve the cavitation of polyurethane foaming machine
  • ●「聚氨酯产品」地铁防水工程复合防 [07-24] ● "Polyurethane Products"
  • ●聚氨酯喷涂作业时“应该”和“不应 [10-29] ● "should" and "should not" when spraying polyurethane
  • ●影响聚氨酯喷涂施工出方率的几个因 [10-29] ● Several factors affecting the yield of polyurethane spraying construction
  • ●聚氨酯喷涂施工的常见问题及原因 [10-29] ● Common problems and reasons of polyurethane spraying construction
  • ●聚氨酯防腐应用以及储存 [10-21] ● Application and storage of polyurethane anticorrosion
  • ●聚氨酯防腐漆在出现剥落现象 [10-21] ● The polyurethane anticorrosive paint is peeling off
  • ●聚氨酯防腐的主要涂覆方法 [10-21] ● Main coating methods for polyurethane anticorrosion
  • ●聚氨酯防腐的涂装工艺 [10-21] ● Polyurethane anticorrosive coating process
  • ●如何提高聚氨酯防腐的性能 [10-21] ● How to improve the anticorrosive performance of polyurethane
  • ●聚氨酯防腐适用领域以及特点 [10-21] ● Application areas and characteristics of polyurethane anticorrosion
  • ●聚氨酯高压喷涂设备的主要优点 [10-19] ● Main advantages of high pressure polyurethane spray equipment
  • ●聚氨酯发泡机选购前的对比方法 [09-19] ● Comparison method before purchasing polyurethane foaming machine
  • ●聚氨酯发泡机特点和工作流程介绍 [09-19] ● Introduction of polyurethane foam machine characteristics and work flow
  • ●聚氨酯高压发泡机和低压发泡机的区 [08-08] ● The area of polyurethane high pressure foaming machine and low pressure foaming machine
  • ●「耐高温材料」聚氨酯硬泡的发展方 [07-25] ● Development method of "high temperature resistant material" polyurethane rigid foam
  • ●「ws15」喷涂型聚氨酯应用指南 [07-25] ● "ws15" Spraying Polyurethane Application Guide
  • Analysis of "PVC material" polyurethane delayed catalyst
    来源:http://motokone.com发布时间: 2019-07-25 13:53 Author: Polyurethane foam machine Source: http: //motokone.com Published: 2019-07-25 13:53
    「Pvc material」
    Polyurethane delay catalyst is an extremely special type of catalyst in polyurethane catalysts. This type of catalyst can provide the catalytic activity required for curing of polyurethane, and at the same time, it can extend the product life and provide more operating time for construction. Unlike inhibitors, polyurethane delayed catalysts are relatively delayed, not retarded. Compared with conventional catalysts, the front-stage activity is lower, and the overall activity is comparable. It cannot play the role of delayed response in a system without the addition of a catalyst.
    According to different uses, we divide the delayed catalysts into two categories: delayed catalysts for foams, delayed catalysts for CASE
    (CASE stands for Polyurethane Coating, Polyurethane Sealant, Polyurethane Adhesive and Polyurethane Elastomer)
    Polyurethane foam includes polyurethane rigid foam, soft foam, semi-rigid foam, self-skinning and other products. The main reactions that have been touched include foaming, gelling, and trimering. Therefore, the commonly used catalysts for polyurethane foam are mainly divided into two types: delayed foam catalyst and delayed gel catalyst.
    There are mainly delayed gel catalysts. The commonly used delayed foaming catalyst is mainly GST-225, which is a glycol solution of modified bis (dimethylaminoethyl) ether, which can delay the milky time, increase the flowability in the early stage, and accelerate the late maturation.
    Delayed gel catalysts include GST-8154 (modified triethylene diamine solution), GST-300, and so on. In particular, GST-8154 is more commonly used. It is widely used in rigid foam, soft foam, semi-rigid foam, and self-skinning. It can also be seen in local microcellular elastomer formulations.

    A new type of delayed catalyst. This type of product is different from the common catalysts on the market. It is a type of delayed catalyst specially developed by Gusite Chemicals. The main products are GST-215 and so on. It has the characteristics of low foaming efficiency, good delay effect and strong gel effect, that is, it can provide early mobility and accelerate post-maturation to accelerate demoulding. It can be used in combination with most catalysts, and can replace the use of organotin in local formulations to increase early activity without affecting later maturity.
    Compared with foam catalysts, the catalysts required by CASE must have the characteristics of fast gelation speed, micro-foaming and even non-foaming. Common catalysts mainly include GST-12 ((organic bismuth), phenylmercury acetate, etc .. Therefore, the delay of CASE use The catalyst should be comparable to tin catalysts in terms of catalytic activity, and it is difficult to reach the mercury effect in foaming efficiency, and it should be as close as possible to the effect of dibutyltin dilaurate.
    At the same time, the application scope of CASE is different from the consumption of foam. The raw materials and processes used are cumbersome. The choice of polyether polyester varieties, the different isocyanates, the temperature, and the sequence of the synthesis steps will all lead to huge differences in results. Therefore, the choice of CASE products on the delayed catalyst cannot be confused, and the demand is based on many factors.
    The following figure is a comparison of the catalyst-free cured product and the cured product catalyzed by Gust Chemical Delayed Catalyst. It can be seen that the use of a suitable delayed catalyst can achieve the high efficiency and low foaming of tin-mercury products.
    「Pvc material」