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A kind of polymer powder surface treatment method

A processing method and polymer technology, applied in the direction of improving process efficiency, improving energy efficiency, etc., can solve the problem of no regulation of surface characteristics, and achieve the effect of improving application effect, simple and general method, and wide application range.

Active Publication Date: 2022-07-12
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, the surface treatment of polymer powder in the prior art focuses on the spheroidization of the powder to improve the flow without regulating the surface characteristics; on the other hand, it is limited by different powder materials and requires the use of high temperature or special solvents for processing

Method used

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  • A kind of polymer powder surface treatment method
  • A kind of polymer powder surface treatment method
  • A kind of polymer powder surface treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Dissolve 30g β-cyclodextrin in 600ml deionized water, add 18g NaOH solution (0.75mol / L), stir under ice bath for 30min, add 6g p-toluenesulfonyl chloride in batches, keep stirring at 0-5°C After reaction for 5h, suction filtration to obtain pale yellow clear solution, adjust pH to 6-7 with 2mol / L hydrochloric acid, white precipitate is precipitated, refrigerate overnight, suction filter and recrystallize twice, and dry to obtain 6-OTs-β-CD.

[0058] Take 0.83g potassium carbonate and 2ml ethylenediamine in a 100ml three-necked round bottom flask, add 15ml DMF as a solvent, stir at room temperature for 2h, add 7.8g of 6-OTs-β-CD dissolved in 15ml DMF, heat up to 80°C, The reaction was stirred under nitrogen protection for 24h. After cooling, the reaction solution was poured into 200 ml of acetone for precipitation, and after suction filtration and drying, light yellow solid ethylenediamine-β-cyclodextrin was obtained.

[0059] 100 parts by mass of water, 2 parts by mass...

Embodiment 2

[0062] 100 parts by mass of aqueous medium (1wt% methanol aqueous solution), 0.4 parts by mass of polyvinylpyrrolidone with a number-average molecular weight of 150,000 g / mol, and 0.01 parts by mass of defoamer BYK-019 were heated and mixed uniformly at 90°C to obtain a treated solution;

[0063] 2 parts by mass of D 50 = 300 μm thermoplastic polyurethane powder was mixed with the aforementioned treatment solution, and mixed at 35° C. for 10 minutes. After solid-liquid separation by centrifugation, vacuum-dried at 60° C. for 4.5 hours to obtain polymer microsphere powder.

Embodiment 3

[0065] 100 mass parts of aqueous medium (8wt% ethanol aqueous solution), 5 mass parts of hydroxyethyl cellulose (number average molecular weight 20000g / mol, the viscosity of its 2wt% aqueous solution is 50mPa.s), 0.1 mass parts defoamer BYK-024 was heated and mixed evenly at 60°C to obtain a treatment solution;

[0066] 50 parts by mass of D 50 = 10 μm thermoplastic polyurethane powder was mixed with the aforementioned treatment solution, and mixed at 50 °C for 60 min. After solid-liquid separation using a screen, it was dried under normal pressure at 90 °C for 2 hours to obtain polymer microsphere powder.

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Abstract

The present invention relates to a kind of surface treatment of polymer powder, using polymer powder as raw material, comprising the following steps: Step 1: adding water-soluble polymer, aqueous medium, defoaming agent and optional amino cyclodextrin derivative Heat and mix evenly to obtain a treatment solution, the water-soluble polymer has a number average molecular weight of 20,000 g / mol to 150,000 g / mol; step 2: Mix the polymer powder and the treatment solution, and mix them evenly to obtain a powder-containing solid liquid mixture; step 3: the mixture obtained in step 2 is subjected to solid-liquid separation and drying to obtain the treated thermoplastic polymer powder. The powder roughness is reduced through the adsorption of the water-soluble polymer to the high surface energy region of the powder, no high temperature and high pressure treatment is required, and the method is simple and safe. The processed powder can be used in powder coatings, 3D printing, cosmetics, additives, medicine and other fields.

Description

technical field [0001] The invention belongs to the technical field of polymer powder, and in particular relates to a method for surface treatment of polymer powder, and the powder prepared by the method can be used in technical fields such as powder coating and 3D printing. Background technique [0002] The development of modern high-tech and new material industries, technological progress of traditional industries and product upgrades require many polymer powder raw materials. Due to the fine particle size of the powder, the large specific surface area, and the large number of surface particles, the interaction force between the surface particles and the internal particles is different. It has higher energy (surface energy) and activity than the particles inside it. Therefore, the surface properties of the powder determine the special properties of the powder, such as low sintering temperature, high sintered body strength, good filling and reinforcement properties, and un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/12C08L23/12C08L75/04C08L69/00C08L5/16C08L29/04C08L39/06C08L1/28
CPCC08J3/126C08J2405/16C08J2429/04C08J2323/12C08J2439/06C08J2375/04C08J2401/28C08J2369/00Y02P10/25
Inventor 杨杰黄岐善
Owner WANHUA CHEM GRP CO LTD
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