News Details
Chain extender
2017-2-20 17:28:31
Chain extender,And chain extender for polyurethane adhesives sealant synthesis is very important, directly affect the mechanical properties of the product and process performance.
Chain extender for low molecular mass containing hydroxy and amino alcohols or more functional groups, amine compounds commonly used alcohol chain extender with 1, 4 yiding diol (BDO), 1, 6 alone glycol, glycerin, trimethylolpropane, diethylene glycol (DEG), triethylene glycol, neopentyl glycol (NPG), sorbitol, diethyl amino ethanol (DEAE), etc.
Amine chain extender with MOCA and modified by formaldehyde of liquid MOCA, ethylenediamine (DA), N, N - dihydroxy (diisopropyl aniline (HPA), etc. 12 and hydroquinone (beta hydroxyethyl) ether (HQEE), used as chain extender, polyurethane adhesives its product heat resistance, hardness and elasticity than the generally used chain extender.
Necessary reagents to the production of polyurethane, polyurethane is by including two different acrylic acid ester base of aliphatic and aromatic monomer and contain binary or polyester or polyether polyols reaction to form prepolymer, application to join the chain extender resins forming. Common chain extender is small molecules containing dual or multiple hydroxyl alcohol, contain amino, and amino compounds or ethers.
Commonly used in production, some compounds containing active hydrogen end group with isocyanate prepolymer reaction, the molecular diffusion chain extension, so as to realize the resin curing forming. 2 - imidazole alkane ketone is a widely used with the amino active hydrogen chain extender.
In polyester process due to thermal degradation and hydrolysis results in the decrease of molecular weight, end carboxyl amount increase, thus lower mechanical and chemical properties of polymers. Under the condition of reactive blending add double functional group small molecule compounds.
For example: bifunctional acid derivatives, isocyanate, acid anhydride and epoxide, these double functional compounds contain easily with carboxyl, hydroxyl and reactions such as amino functional groups, can directly react with low molecular mass oligomer, form a "bridge" between the two polymer chains, a significant increase in molecular weight, improve the viscosity of the system, reduce the end carboxyl content. The end of the linear polyester mainly includes the hydroxyl and carboxyl, therefore on the polyester chain extender for selecting compounds with hydroxyl or carboxyl bonus.
Chain extension agent, also known as chain extension agent, is to be able to react with functional groups on the linear polymer chains and make the chain extension, the increase of molecular weight material. Are often used to improve mechanical properties of polyurethane, polyester and other products and process performance.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
Chain extender for polyurethane elastomer structure performance impact testing methods: the measurement of contact Angle (CA) using contact Angle tester with Finland on 5 u L deionized water titration of ethylene glycol in different surface neat polyurethane board. Water contact Angle measuring static drop method is adopted. The CA within 45 to 60 s precision of the measurement error in + / - 1 ℃. Repeat the test 6-10 times the same samples of different specimens, and then check its accuracy.
Chain extender and prepolymer molecular bonding together, increase the molecular weight, at this point, the crosslinking agent, forming a complete polymer network. Chain extender on the hard and soft block in polyurethane polymer directly impact on the distribution. The crystallization and the degree of crosslinking is also affected, depending on the structure of the chain extender and chain extender is with functions of amino or hydroxyl functionality.
Using diisocyanate, 2 oxazoline, such as chain extender, not only can synthesize all kinds of high molecular weight polymer, but also for PET, nylon and so on large-scale industrialization product chain extender viscous and blending of capacity also is of great significance. Isocyanate extender chain is mainly suitable for the basic research of polymer synthesis, 2 oxazoline is widely used in industry.
Extender chain viscous, in particular, with 2 oxazoline extender chain, such as not to extend the time of melt polycondensation, also won't appear in the solid phase polymerization and so on viscous slow, degradation reaction intensified, carboxyl content, such as faults, don't need special equipment, and has quick response speed, strong applicability, don't need to increase equipment, etc, can be in polycondensation kettle, melt spinning, screw extrusion and injection molding process, especially the 2 oxazoline ring chain extension agent such as no small molecular by-products generated after reaction.
2 oxazoline ring chain extension agent such as widespread attention at home and abroad, such as in PBT resin chain extender viscous and blending in the capacity of successful application, etc. Predictably, with the deepening of the research and development, not only 2 oxazoline chain extension agent, various chain extender in the future will be more widely used.
Amine chain extender polyurethane general strength is higher, it is mainly used for casting type thermosetting polyurethane elastomer; Alcohol strength of the chain extender polyurethane is generally relatively low, but not absolute, associated with the isocyanate, the same kind of alcohol strength of chain extender for TDI system may be poor, but used to MDI or NDI strength may be than amine. Also like HQEE, molecular structure of benzene ring, strength is very good. Alcohol regardless of thermosetting or thermoplastic polyurethane chain extender agent will use.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Chain extender for low molecular mass containing hydroxy and amino alcohols or more functional groups, amine compounds commonly used alcohol chain extender with 1, 4 yiding diol (BDO), 1, 6 alone glycol, glycerin, trimethylolpropane, diethylene glycol (DEG), triethylene glycol, neopentyl glycol (NPG), sorbitol, diethyl amino ethanol (DEAE), etc.
Amine chain extender with MOCA and modified by formaldehyde of liquid MOCA, ethylenediamine (DA), N, N - dihydroxy (diisopropyl aniline (HPA), etc. 12 and hydroquinone (beta hydroxyethyl) ether (HQEE), used as chain extender, polyurethane adhesives its product heat resistance, hardness and elasticity than the generally used chain extender.
Necessary reagents to the production of polyurethane, polyurethane is by including two different acrylic acid ester base of aliphatic and aromatic monomer and contain binary or polyester or polyether polyols reaction to form prepolymer, application to join the chain extender resins forming. Common chain extender is small molecules containing dual or multiple hydroxyl alcohol, contain amino, and amino compounds or ethers.
Commonly used in production, some compounds containing active hydrogen end group with isocyanate prepolymer reaction, the molecular diffusion chain extension, so as to realize the resin curing forming. 2 - imidazole alkane ketone is a widely used with the amino active hydrogen chain extender.
In polyester process due to thermal degradation and hydrolysis results in the decrease of molecular weight, end carboxyl amount increase, thus lower mechanical and chemical properties of polymers. Under the condition of reactive blending add double functional group small molecule compounds.
For example: bifunctional acid derivatives, isocyanate, acid anhydride and epoxide, these double functional compounds contain easily with carboxyl, hydroxyl and reactions such as amino functional groups, can directly react with low molecular mass oligomer, form a "bridge" between the two polymer chains, a significant increase in molecular weight, improve the viscosity of the system, reduce the end carboxyl content. The end of the linear polyester mainly includes the hydroxyl and carboxyl, therefore on the polyester chain extender for selecting compounds with hydroxyl or carboxyl bonus.
Chain extension agent, also known as chain extension agent, is to be able to react with functional groups on the linear polymer chains and make the chain extension, the increase of molecular weight material. Are often used to improve mechanical properties of polyurethane, polyester and other products and process performance.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
Chain extender for polyurethane elastomer structure performance impact testing methods: the measurement of contact Angle (CA) using contact Angle tester with Finland on 5 u L deionized water titration of ethylene glycol in different surface neat polyurethane board. Water contact Angle measuring static drop method is adopted. The CA within 45 to 60 s precision of the measurement error in + / - 1 ℃. Repeat the test 6-10 times the same samples of different specimens, and then check its accuracy.
Chain extender and prepolymer molecular bonding together, increase the molecular weight, at this point, the crosslinking agent, forming a complete polymer network. Chain extender on the hard and soft block in polyurethane polymer directly impact on the distribution. The crystallization and the degree of crosslinking is also affected, depending on the structure of the chain extender and chain extender is with functions of amino or hydroxyl functionality.
Using diisocyanate, 2 oxazoline, such as chain extender, not only can synthesize all kinds of high molecular weight polymer, but also for PET, nylon and so on large-scale industrialization product chain extender viscous and blending of capacity also is of great significance. Isocyanate extender chain is mainly suitable for the basic research of polymer synthesis, 2 oxazoline is widely used in industry.
Extender chain viscous, in particular, with 2 oxazoline extender chain, such as not to extend the time of melt polycondensation, also won't appear in the solid phase polymerization and so on viscous slow, degradation reaction intensified, carboxyl content, such as faults, don't need special equipment, and has quick response speed, strong applicability, don't need to increase equipment, etc, can be in polycondensation kettle, melt spinning, screw extrusion and injection molding process, especially the 2 oxazoline ring chain extension agent such as no small molecular by-products generated after reaction.
2 oxazoline ring chain extension agent such as widespread attention at home and abroad, such as in PBT resin chain extender viscous and blending in the capacity of successful application, etc. Predictably, with the deepening of the research and development, not only 2 oxazoline chain extension agent, various chain extender in the future will be more widely used.
Amine chain extender polyurethane general strength is higher, it is mainly used for casting type thermosetting polyurethane elastomer; Alcohol strength of the chain extender polyurethane is generally relatively low, but not absolute, associated with the isocyanate, the same kind of alcohol strength of chain extender for TDI system may be poor, but used to MDI or NDI strength may be than amine. Also like HQEE, molecular structure of benzene ring, strength is very good. Alcohol regardless of thermosetting or thermoplastic polyurethane chain extender agent will use.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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