News Details
Epoxy chain extender
2017-2-22 17:44:39
Epoxy chain extender and PET production increased rapidly in recent years, but the production of large Numbers of waste PET is followed, according to incomplete statistics, in 2007 the national demand of about 1.6 million tons to 2 million tons of PET and PET bottle consumption is as high as 60 billion, a large number of one-time consumption of PET bottle, has brought the serious problem of recycling. From an environmental and economic considerations, the recycling of waste PET has become a top priority, how to effectively recycle these PET has become an issue of common concern to the whole society.
Recycled PET (R2PET) the most important thing is to improve the relative molecular mass, usage and chain extender on the PET to increase the reinforced adhesion molecular weight is a hotspot of current research.
PET chain extender are condensation type chain extension agent, carboxyl plus molding chain extender, hydroxyl and molding chain extender, carboxy hydroxyl and chain extender. The mouth of the commonly used oxazoline compounds and epoxy compounds are carboxyl and chain extender. Literature counterpart oxazoline type chain extension agent has made a detailed report, but less research on epoxy chain extender.
On epoxy and oxazoline class chain extender to do the contrast experiment, found that the epoxy compounds of extender chain effect is better than the mouth oxazoline compounds. Based on the ordinary free-radical suspension copolymerization of the prepared a new type of epoxy chain extender SMC, not reported in the literature, and has achieved with commercial epoxy chain extender ADR extender chain effect similar to it.
SMC synthetic route: synthetic reaction using free radical copolymerization. Main body for styrene and EMC. EMC can compound on free radical reaction, and can provide synthetic product with epoxy groups; Styrene electronic liquidity is bigger, easily induced polarization, free radicals reaction activity is higher. Dispersant for polyvinyl alcohol, to reduce the response of a large number of thermal polymerization, avoid violence. Initiator AIBN, to control the molecular weight of the product at the same time, adopt tetrachloroethane as chain transfer agent.
The experimental steps: 10% NaOH solution: styrene = 1:1, with a separatory funnel three times; With distilled water according to the 1:1, again with the separatory funnel three times; Set the water-bath water heating temperature of 60 ℃; Add 100 ml to 250 ml flask four distilled water, 0108 g dispersant polyvinyl alcohol, constant temperature and 60 ℃; 10 ml were taken to remove inhibitor of a percentage of EMC and styrene monomer, and a certain amount of AIBN initiator.
AIBN soluble in styrene and evenly mixed with EMC to join flask; Add a certain amount of tetrachloroethane; Control of reaction temperature, and gradually raise the temperature to 70 ℃, reaction to the small particles precipitate, white, and not sticky termination reaction. Time is about 5 h. Collection of polymer particles, vacuum suction filter, washing adequately with hot distilled water, remove the surface of the dispersant and monomer, dry and set aside.
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
By free radical suspension polymerization process epoxy chain extender was synthesized successfully 2 SMC styrene copolymer (SMC), monomer proportion in the ratio of monomer and SMC (mass fraction) content of EMC structural unit in the approximate linear relationship between. SMC used in recycled PET chain extender viscous, obtained the obvious effect of chain extender, after the chain extender PET characteristic viscosity.methods increased by 20% the left and right sides, extender chain effect is slightly higher than the commercial chain extender ADR.
To study the influence of various factors on the PU dispersion viscosity. In its research system, when w (DMPA) 2.4% or less, can't form a stable emulsion, so the viscosity test data error (big); When w (DMPA) > 2.4%, with the increase of dosage of DMPA, emulsion appearance by the trend of the milky white to transparent blue emulsion viscosity has been increased.
This is due to the pre polymer dispersed in water, the hydrophobic chain formation period of inward contraction nuclear emulsion particles, with carboxyl distribution of hydrophilic radical anion in the latex particle surface facing the water; Due to particles Brownian motion, the electric double layer formed by the positive and negative ions on the particle surface, can make the hydrated ion readily dispersed in water, the emulsion stability.
Along with the increase of the content of hydrophilic radical emulsion obvious changes in appearance, this is WPU particles size change caused by a macro performance (i.e. large particle size, by blocking the light, the white appearance of the emulsion is phenomenon; when reach nanoscale dispersion particle size, the light can bypass the WPU particles move on, appearance of the emulsion is transparent, blu-ray phenomenon).
According to O Lorentz electric double layer theory, the viscosity of the emulsion is not affected by the size of the dispersed particles, but by the influence of particle size were obtained. DMPA content is higher, after pre polymers into salt and water to form hydrated ion stability, at the same time, the electric double layer thickness of the hydrated ion increased, volume and enhanced interaction with water molecules, leading to the viscosity of the system increased.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Recycled PET (R2PET) the most important thing is to improve the relative molecular mass, usage and chain extender on the PET to increase the reinforced adhesion molecular weight is a hotspot of current research.
PET chain extender are condensation type chain extension agent, carboxyl plus molding chain extender, hydroxyl and molding chain extender, carboxy hydroxyl and chain extender. The mouth of the commonly used oxazoline compounds and epoxy compounds are carboxyl and chain extender. Literature counterpart oxazoline type chain extension agent has made a detailed report, but less research on epoxy chain extender.
On epoxy and oxazoline class chain extender to do the contrast experiment, found that the epoxy compounds of extender chain effect is better than the mouth oxazoline compounds. Based on the ordinary free-radical suspension copolymerization of the prepared a new type of epoxy chain extender SMC, not reported in the literature, and has achieved with commercial epoxy chain extender ADR extender chain effect similar to it.
SMC synthetic route: synthetic reaction using free radical copolymerization. Main body for styrene and EMC. EMC can compound on free radical reaction, and can provide synthetic product with epoxy groups; Styrene electronic liquidity is bigger, easily induced polarization, free radicals reaction activity is higher. Dispersant for polyvinyl alcohol, to reduce the response of a large number of thermal polymerization, avoid violence. Initiator AIBN, to control the molecular weight of the product at the same time, adopt tetrachloroethane as chain transfer agent.
The experimental steps: 10% NaOH solution: styrene = 1:1, with a separatory funnel three times; With distilled water according to the 1:1, again with the separatory funnel three times; Set the water-bath water heating temperature of 60 ℃; Add 100 ml to 250 ml flask four distilled water, 0108 g dispersant polyvinyl alcohol, constant temperature and 60 ℃; 10 ml were taken to remove inhibitor of a percentage of EMC and styrene monomer, and a certain amount of AIBN initiator.
AIBN soluble in styrene and evenly mixed with EMC to join flask; Add a certain amount of tetrachloroethane; Control of reaction temperature, and gradually raise the temperature to 70 ℃, reaction to the small particles precipitate, white, and not sticky termination reaction. Time is about 5 h. Collection of polymer particles, vacuum suction filter, washing adequately with hot distilled water, remove the surface of the dispersant and monomer, dry and set aside.
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
By free radical suspension polymerization process epoxy chain extender was synthesized successfully 2 SMC styrene copolymer (SMC), monomer proportion in the ratio of monomer and SMC (mass fraction) content of EMC structural unit in the approximate linear relationship between. SMC used in recycled PET chain extender viscous, obtained the obvious effect of chain extender, after the chain extender PET characteristic viscosity.methods increased by 20% the left and right sides, extender chain effect is slightly higher than the commercial chain extender ADR.
To study the influence of various factors on the PU dispersion viscosity. In its research system, when w (DMPA) 2.4% or less, can't form a stable emulsion, so the viscosity test data error (big); When w (DMPA) > 2.4%, with the increase of dosage of DMPA, emulsion appearance by the trend of the milky white to transparent blue emulsion viscosity has been increased.
This is due to the pre polymer dispersed in water, the hydrophobic chain formation period of inward contraction nuclear emulsion particles, with carboxyl distribution of hydrophilic radical anion in the latex particle surface facing the water; Due to particles Brownian motion, the electric double layer formed by the positive and negative ions on the particle surface, can make the hydrated ion readily dispersed in water, the emulsion stability.
Along with the increase of the content of hydrophilic radical emulsion obvious changes in appearance, this is WPU particles size change caused by a macro performance (i.e. large particle size, by blocking the light, the white appearance of the emulsion is phenomenon; when reach nanoscale dispersion particle size, the light can bypass the WPU particles move on, appearance of the emulsion is transparent, blu-ray phenomenon).
According to O Lorentz electric double layer theory, the viscosity of the emulsion is not affected by the size of the dispersed particles, but by the influence of particle size were obtained. DMPA content is higher, after pre polymers into salt and water to form hydrated ion stability, at the same time, the electric double layer thickness of the hydrated ion increased, volume and enhanced interaction with water molecules, leading to the viscosity of the system increased.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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