News Details
Chain extender for polyurethane performance impact test
2017-2-24 23:21:19
Chain extender for polyurethane performance impact test, a more modern aircraft laminated transparent is composite laminated glass, the middle layer materials mainly with polyvinyl butyral (PVB), polyurethane (PU) and silicone and vinyl terpolymer. PVB film was once one of the most widely used transparent middle layer materials, the domestically produced PVB material basically has "413" and "813" two brands.
PVB film with organic transparent materials such as organic glass (PMMA), polycarbonate (PC) and so on the adhesive performance is poor and PVB body phase of plasticizing agent easy PC board surface erosion, its use range decreases. PU film is in the 1970 s the United States first developed a kind of adhesive material, its elasticity is inherent, don't need to add plasticizer for flexibility. The PU film was used to glue the PC board, eventually found it with inorganic glass, PMMA and PC has good adhesive performance.
PU film in foreign countries has been widely used in aircraft windshield. The gulf war, the use of the F - 111 multi-purpose fighter windshield is made up of two layers of tempered glass and PU middle tier. With aromatic diisocyanate as TDI, MDI synthesis of PU elastomer containing aromatic two urea bridge bond, easy to oxidize to hair color under uv irradiation of quinone structure, lower the product transparency. And aliphatic diisocyanate not containing benzene ring, under uv irradiation, no oxidation become yellow, can be used to make transparent resistance to yellowing of the PU products.
For more than ten years, foreign researchers recently launched a series of transparent PU elastomer, affecting the PU transparency and mechanical properties of many factors are discussed in this paper, the optimized synthesis of formula and technological conditions; Domestic also conducted active exploration in this area. However, there have been reports of H12MDI based PU more partial to research the mechanical properties, a systematic analysis of chain extender on H12MDI based the structure and the bonding performance of transparent PU less reported. Laminated glass is in use process, subjected to the change of environmental temperature, reciprocating fatigue deformation, glass is easy to degumming. As a result, the middle layer material and base material of adhesive performance directly affect the service life of laminated glass.
Study the structure of chain extender on the mechanical properties of transparent PU elastomer H12MDI, optical properties and the influence of the bonding performance, some rules are obtained conclusion law of sex. In addition, with 1 HNMR and 13 CNMR characterization of the polymer structure, and the NMR spectrum belongs; And X-ray photoelectron spectroscopy (XPS) and atomic force microscope (AFM) to study the PU/PMMA stripping interface, interfacial chemical reaction mechanism is proposed.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
PU synthetic method references, PTMEG, H12MDI and catalyst to join with a thermometer and agitator three-necked flask, stir heating temperature to 80 ℃, reaction 4 h, which made the PU pre polymers. Pre polymers and chain extender under 35 ℃ vacuum mixed in proportion to the bright, made of PU castable. After vacuum degassing of the castable into ptfe mold, curing 6 h under 95 ℃, the curing completely, place 7 days after testing the samples at room temperature mechanical properties.
The floating roller stripping ASTMD3167 according to the standard sample preparation. Peel strength, stress and tear strength test on the GT - the AT - 3000 tensile test machine. Polymer structure on AV600 type nuclear magnetic resonance apparatus was tested. Experiment with deuterium generation of chloroform as solvent, four methyl silane as internal standard. Deuterium generation of chloroform hydrogen chemical shift set in 7.24 x LO - 6, chemical shift is set in 7.7 x 10 carbon atoms - 5, displacement of other atoms with them as reference.
PU/PMMA sabotage interface using DigitalInstru - mentsMetrologyGroup atomic force microscopy. PU/PMMA interface element composition and chemical state analysis conducted on ESCALab250 type X ray photoelectron spectrometer. Of excitation source used for monochrome power is 150 w AlK alpha x-rays, experiments using can appear a fixed mode, each element of the narrow scanning spectrum used fully to 30 eV, step length is 0.05 eV. Spectra of charged effect with C1s from hydrocarbon correction (284.8 eV) peak.
PMMA/PU/PMMA composite plate and ultraviolet-visible absorption curve on Varian5000UV - Vis - NIR spectrophotometer. Experiments, which had cured PU pouring into two layer 3 mm mold made of acrylic glass panel, 95 ℃ curing 6 h. Place 1 week after the test. Light transmittance and fog light transmittance model using WGT - S mist tester. Contact Angle type using OCA20 video optical contact Angle measuring instrument testing.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
PVB film with organic transparent materials such as organic glass (PMMA), polycarbonate (PC) and so on the adhesive performance is poor and PVB body phase of plasticizing agent easy PC board surface erosion, its use range decreases. PU film is in the 1970 s the United States first developed a kind of adhesive material, its elasticity is inherent, don't need to add plasticizer for flexibility. The PU film was used to glue the PC board, eventually found it with inorganic glass, PMMA and PC has good adhesive performance.
PU film in foreign countries has been widely used in aircraft windshield. The gulf war, the use of the F - 111 multi-purpose fighter windshield is made up of two layers of tempered glass and PU middle tier. With aromatic diisocyanate as TDI, MDI synthesis of PU elastomer containing aromatic two urea bridge bond, easy to oxidize to hair color under uv irradiation of quinone structure, lower the product transparency. And aliphatic diisocyanate not containing benzene ring, under uv irradiation, no oxidation become yellow, can be used to make transparent resistance to yellowing of the PU products.
For more than ten years, foreign researchers recently launched a series of transparent PU elastomer, affecting the PU transparency and mechanical properties of many factors are discussed in this paper, the optimized synthesis of formula and technological conditions; Domestic also conducted active exploration in this area. However, there have been reports of H12MDI based PU more partial to research the mechanical properties, a systematic analysis of chain extender on H12MDI based the structure and the bonding performance of transparent PU less reported. Laminated glass is in use process, subjected to the change of environmental temperature, reciprocating fatigue deformation, glass is easy to degumming. As a result, the middle layer material and base material of adhesive performance directly affect the service life of laminated glass.
Study the structure of chain extender on the mechanical properties of transparent PU elastomer H12MDI, optical properties and the influence of the bonding performance, some rules are obtained conclusion law of sex. In addition, with 1 HNMR and 13 CNMR characterization of the polymer structure, and the NMR spectrum belongs; And X-ray photoelectron spectroscopy (XPS) and atomic force microscope (AFM) to study the PU/PMMA stripping interface, interfacial chemical reaction mechanism is proposed.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
PU synthetic method references, PTMEG, H12MDI and catalyst to join with a thermometer and agitator three-necked flask, stir heating temperature to 80 ℃, reaction 4 h, which made the PU pre polymers. Pre polymers and chain extender under 35 ℃ vacuum mixed in proportion to the bright, made of PU castable. After vacuum degassing of the castable into ptfe mold, curing 6 h under 95 ℃, the curing completely, place 7 days after testing the samples at room temperature mechanical properties.
The floating roller stripping ASTMD3167 according to the standard sample preparation. Peel strength, stress and tear strength test on the GT - the AT - 3000 tensile test machine. Polymer structure on AV600 type nuclear magnetic resonance apparatus was tested. Experiment with deuterium generation of chloroform as solvent, four methyl silane as internal standard. Deuterium generation of chloroform hydrogen chemical shift set in 7.24 x LO - 6, chemical shift is set in 7.7 x 10 carbon atoms - 5, displacement of other atoms with them as reference.
PU/PMMA sabotage interface using DigitalInstru - mentsMetrologyGroup atomic force microscopy. PU/PMMA interface element composition and chemical state analysis conducted on ESCALab250 type X ray photoelectron spectrometer. Of excitation source used for monochrome power is 150 w AlK alpha x-rays, experiments using can appear a fixed mode, each element of the narrow scanning spectrum used fully to 30 eV, step length is 0.05 eV. Spectra of charged effect with C1s from hydrocarbon correction (284.8 eV) peak.
PMMA/PU/PMMA composite plate and ultraviolet-visible absorption curve on Varian5000UV - Vis - NIR spectrophotometer. Experiments, which had cured PU pouring into two layer 3 mm mold made of acrylic glass panel, 95 ℃ curing 6 h. Place 1 week after the test. Light transmittance and fog light transmittance model using WGT - S mist tester. Contact Angle type using OCA20 video optical contact Angle measuring instrument testing.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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