News Details
Amide chain extender
2017-2-21 11:57:01
Amide chain extender, the melting point determination. With more than a Tory mettler instrument FP900 mettler Toledo melting point determination.
The determination of nitrogen content. 1. 1 ~ 1. 2 g sample put in drying of the alimentary canal, and in turn add CuSO40. 8 g, K2SO47g, sulfuric acid (98%), 13 ml, digestion in electric furnace, in response to the digestive tube material turn green.
Turn the power off and remove the digestive tube, wait for after its cooling add 75 ml of distilled water, then add FOSSTECA - TOR nitrogen determination apparatus, alkaline, start the nitrogen determination apparatus, through distillation device release ammonia and collect to 25 ml, 4% boric acid solution, hydrochloric acid standard solution titration to absorb fluid from green to light purple, based on the consumption volume of hydrochloric acid standard solution to calculate the nitrogen content of the sample.
Infrared spectrum analysis.
According to synthetic product with KBr will quality than 1:100 into mortar porphyrization tabletting, use WQF - 510 type Fourier transform infrared spectroscopy (FTIR) to FTIR characterization of synthetic products. Test condition is: the TGS detector, 4 cm - 1 resolution, scanning 32 times, scanning range is 4000 ~ 400 cm - 1.
1 H nuclear magnetic resonance (NMR) analysis. Varianinova500M nuclear magnetic resonance instrument, used to deuterium generation of water as solvent, using 5 mm sample tube, spectral width is 11. 99 KHZ, 99. 536 k data points, relaxation delay time of 3 s.
Melting point determination. Repeated the experiment many times according to the main reaction conditions, the synthetic product melting process were determined, measured its melting range is 171 ~ 172.
Test before and after the modification of diamine activity method is to measure its reaction with isocyanate gel time. Gel time starts timing refers to the two-component mixed raw material, to the time when the mixture is no longer flow. Gel and the longer that the smaller its reactivity, the shorter the gel time shows its reactivity.
Before the trial, the sample under test must be plus or minus 0 at 25 degrees Celsius. Place more than 8 h 5 degrees Celsius. D - 2000, of the test were and chain extender were about 50 g, in a 250 ml of disposable plastic cup, according to the - NCO / - NH = 1. 05 by decrement method according to proper MDI polyether polyols half prepolymer to join the plastic cup, mingled with a knife quickly stirring the mixture, stir in the start timing, when to the mixture flow when the time is no longer gel time.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
In the PU elastomer products, the use of crosslinking agent, is usually divided into two categories, including NH2 - and - OH. It contains - NH2 is MOCA (moga) is given priority to, and the toxicity is lower than it contains - C2H5, - SCH3, COO - and so on secondary amine (a phenyl or two phenyl) compounds.
Still up by the dosage of MOCA; While containing - OH for fatty alcohols (such as 1, 4 - butanediol) and aromatic alcohol (such as HQEE, its ehrs, etc.) as its dominant.
Based on participating in the activity levels of different reactants, and operability in the process of preparation and considering the factors such as physical property indexes of the product, according to the practice in industry is roughly formed two series. With TDI and contain - NH2 (MOCA) crosslinking agent series; With MDI and contain - OH (HQEE, its ehrs) crosslinking agent series.
The entity with its ehrs HQEE two products on the market, mainly based on the preparation of PU products performance requirements of different; As well as the processing conditions.
From product structure itself, due to the two HQEE - OCH2CH2OH is in the position of an axis of symmetry, so after with - NCO crosslinking in the polymer structure and its ehrs situation is different, relatively HQEE extension of the performance is better than its ehrs, whereas its ehrs tensile performance better than HQEE.
Practice has proved that, compared with its ehrs HQEE in its ehrs with longer life. Due to the low melting point of its ehrs (its ehrs with a mixture of HQEE also presents the characteristics of the low melting point), it also provides a greatly convenient for casting molding. Practice has proved that HQEE and its ehrs, either used alone, or in accordance with the different proportion of mixed together to use, can obtain satisfactory results.
With isocyanate - NCO activity in the products is different, in order to control the reaction speed, in the process of preparation of PU products, in addition to the care of certain factors, reaction with - NCO, NH2, OH compound options, is a key factor.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
The determination of nitrogen content. 1. 1 ~ 1. 2 g sample put in drying of the alimentary canal, and in turn add CuSO40. 8 g, K2SO47g, sulfuric acid (98%), 13 ml, digestion in electric furnace, in response to the digestive tube material turn green.
Turn the power off and remove the digestive tube, wait for after its cooling add 75 ml of distilled water, then add FOSSTECA - TOR nitrogen determination apparatus, alkaline, start the nitrogen determination apparatus, through distillation device release ammonia and collect to 25 ml, 4% boric acid solution, hydrochloric acid standard solution titration to absorb fluid from green to light purple, based on the consumption volume of hydrochloric acid standard solution to calculate the nitrogen content of the sample.
Infrared spectrum analysis.
According to synthetic product with KBr will quality than 1:100 into mortar porphyrization tabletting, use WQF - 510 type Fourier transform infrared spectroscopy (FTIR) to FTIR characterization of synthetic products. Test condition is: the TGS detector, 4 cm - 1 resolution, scanning 32 times, scanning range is 4000 ~ 400 cm - 1.
1 H nuclear magnetic resonance (NMR) analysis. Varianinova500M nuclear magnetic resonance instrument, used to deuterium generation of water as solvent, using 5 mm sample tube, spectral width is 11. 99 KHZ, 99. 536 k data points, relaxation delay time of 3 s.
Melting point determination. Repeated the experiment many times according to the main reaction conditions, the synthetic product melting process were determined, measured its melting range is 171 ~ 172.
Test before and after the modification of diamine activity method is to measure its reaction with isocyanate gel time. Gel time starts timing refers to the two-component mixed raw material, to the time when the mixture is no longer flow. Gel and the longer that the smaller its reactivity, the shorter the gel time shows its reactivity.
Before the trial, the sample under test must be plus or minus 0 at 25 degrees Celsius. Place more than 8 h 5 degrees Celsius. D - 2000, of the test were and chain extender were about 50 g, in a 250 ml of disposable plastic cup, according to the - NCO / - NH = 1. 05 by decrement method according to proper MDI polyether polyols half prepolymer to join the plastic cup, mingled with a knife quickly stirring the mixture, stir in the start timing, when to the mixture flow when the time is no longer gel time.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
In the PU elastomer products, the use of crosslinking agent, is usually divided into two categories, including NH2 - and - OH. It contains - NH2 is MOCA (moga) is given priority to, and the toxicity is lower than it contains - C2H5, - SCH3, COO - and so on secondary amine (a phenyl or two phenyl) compounds.
Still up by the dosage of MOCA; While containing - OH for fatty alcohols (such as 1, 4 - butanediol) and aromatic alcohol (such as HQEE, its ehrs, etc.) as its dominant.
Based on participating in the activity levels of different reactants, and operability in the process of preparation and considering the factors such as physical property indexes of the product, according to the practice in industry is roughly formed two series. With TDI and contain - NH2 (MOCA) crosslinking agent series; With MDI and contain - OH (HQEE, its ehrs) crosslinking agent series.
The entity with its ehrs HQEE two products on the market, mainly based on the preparation of PU products performance requirements of different; As well as the processing conditions.
From product structure itself, due to the two HQEE - OCH2CH2OH is in the position of an axis of symmetry, so after with - NCO crosslinking in the polymer structure and its ehrs situation is different, relatively HQEE extension of the performance is better than its ehrs, whereas its ehrs tensile performance better than HQEE.
Practice has proved that, compared with its ehrs HQEE in its ehrs with longer life. Due to the low melting point of its ehrs (its ehrs with a mixture of HQEE also presents the characteristics of the low melting point), it also provides a greatly convenient for casting molding. Practice has proved that HQEE and its ehrs, either used alone, or in accordance with the different proportion of mixed together to use, can obtain satisfactory results.
With isocyanate - NCO activity in the products is different, in order to control the reaction speed, in the process of preparation of PU products, in addition to the care of certain factors, reaction with - NCO, NH2, OH compound options, is a key factor.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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