Chemical modification method of polymer powder

A technology of polymers and polymer particles, applied in the field of chemical modification of polymer powders

Active Publication Date: 2013-04-17
XINFENG JIANWEI CHEM INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the existing literature reports, the technology closer to the present invention is to add polymer powder to the cement mortar system, expecting to improve the flexibility or elasticity of concrete, and the process link also uses silane coupling agent to surface recycled rubber tire powder. However, it is limited to the simple physical coating of the coupling agent on the surface of the rubber powder, and does not involve surface chemical modification. The performance of the resulting concrete material should still have a large room for improvement

Method used

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  • Chemical modification method of polymer powder
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Examples

Experimental program
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Effect test

Embodiment 1

[0046] Stir and disperse 100g polymethylmethacrylate (PMMA) powder with an average particle size of 25μm to 300ml containing 5% diethylenetriamine (weight ratio, the same below), 15% KH-550 and 20% dilute hydrochloric acid (original concentration 15%) in diethylene glycol monomethyl ether solution. The ultrasonic treatment was performed with 300W power for 10min, and then placed in a 900W power microwave generator to stir, put in the cooling water inner coil, and the microwave generator was operated at half-full power. The temperature of the reaction system was controlled not to exceed 110°C for a total reaction of 20min. The polymer powder was obtained by filtration, washed with ethanol 3 times (200ml ethanol each time), and dried in vacuum. XPS measured the ratio of C / Si atoms on the surface of polymer particles to be 100:14.3. Measured with MasterSizer 2000 laser particle size analyzer (Malvern, UK), the average particle size is almost unchanged, still about 25μm.

Embodiment 2

[0050] Stir and disperse 100g polymethylmethacrylate (PMMA) powder with an average particle size of 5μm to 300ml containing 5% diethylenetriamine (weight ratio, the same below), 20% diethylenetriaminopropyltrimethoxysilane (Wolker A-1130) and 30% dilute hydrochloric acid (original concentration 15%) in diethylene glycol monomethyl ether solution. Firstly treat with 300W power ultrasonic for 10min, then put it in a 900W power microwave generator and stir, put in the cooling water inner coil, the microwave generator works at 50% full power, control the temperature of the reaction system not to exceed 110℃, and react for 30min in total . The polymer powder was obtained by filtration, washed with ethanol 3 times (200ml ethanol each time), and dried in vacuum. XPS measured the ratio of C / Si atoms on the surface of polymer particles to be 100:16.2. Measured with MasterSizer 2000 laser particle size analyzer (Malvern, UK), the average particle size is almost unchanged, still about 5...

Embodiment 3

[0052] Disperse 100g of polymethylmethacrylate (PMMA) powder with an average particle size of 780μm to 300ml containing 5% diethylenetriamine (weight ratio, the same below), 10% N,N-bis-(triethoxy) Silicon propyl) imine (G-402) and 10% dilute hydrochloric acid (original concentration 15%) in diethylene glycol monoethyl ether solution. Firstly treat with 300W power ultrasonic for 10min, then place it in a 900W power microwave generator and stir, put in the cooling water inner coil, the microwave generator works at 80% full power, control the temperature of the reaction system not to exceed 110℃, and react for 8min in total . The polymer powder was obtained by filtration, washed with ethanol 3 times (200ml ethanol each time), and dried in vacuum. XPS measured the ratio of C / Si atoms on the surface of polymer particles to be 100:21.5. Measured with the MasterSizer 2000 laser particle size analyzer (Malvern, UK), the average particle size is almost unchanged, still about 780μm.

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Abstract

The invention discloses polymer powder subjected to surface chemical grafting modification. In the polymer powder, a reactive alkoxy silane group is chemically linked to the surface of polymer powder particles, the average grain diameter of the solid particles is between 5 microns and 800 microns, and the C / Si atom proportion on the surface of the polymer particles, measured by an X-ray photoelectron spectroscopy (XPS), is 100:(6-30). The invention also discloses a preparation method of the surface modified polymer solid particles, and the method comprises microwave promoted hydrolytic condensation of a specific functional group-containing silane coupling agent in a solvent-diluted hydrochloric acid system and grafting reaction of the specific functional group to the polymer chain under microwave promotion, wherein the hydrolytic condensation of the silane coupling agent and the microwave effect can be used for improving the grafting efficiency of the surface of the polymer powder particles. The modified polymer powder prepared according to the technology provided by the invention is applied to a cement mortar system, and the impact toughness of curing concrete can be remarkably improved.

Description

technical field [0001] The invention relates to a technology for chemically modifying polymer particles, grafting an alkoxysilane coupling agent on the surface of polymer solid particles, and adopting a microwave-assisted method to promote the heterogeneous grafting reaction, that is, by means of microwave promotion , high-efficiency chemical bonding of silane coupling agents containing specific reactive functional groups to the molecular chains on the surface of polymer solid particles, to obtain polymer solid particles rich in alkoxysilane groups on the surface, so that they have surface chemical reaction functions . It belongs to the category of polymer material modification and is potentially applied in coatings, inks, adhesives, organic / inorganic composite materials and other fields. The innovation of the invention lies in the method of grafting the silane coupling agent on the surface of polymer solid particles and the microwave-assisted promotion of the solid-phase gra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/42C08J3/28C08F120/14C08F114/06C08F218/08C08F118/08C08C19/25C04B16/04C04B24/26
Inventor 杨小毛
Owner XINFENG JIANWEI CHEM INDAL
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