A kind of surface polystyrene resin microsphere rich in aldehyde groups and preparation method thereof
A technology of polystyrene resin and microspheres, which is applied in the field of polystyrene resin microspheres and its preparation, and can solve the problems of high cost, cumbersome preparation process, and difficult control of the preparation process, etc.
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[0018] The invention discloses a method for preparing aldylated polystyrene resin microspheres. The method comprises the following steps:
[0019] Step 1. Pretreatment of unmodified polystyrene resin microspheres: first, dichloromethane is used to swell polystyrene resin microspheres for 5-20 hours, and then successively wash and filter with tetrahydrofuran, ultrapure water, absolute ethanol and methanol Several times, and finally vacuum-dried at 20-40°C to constant weight;
[0020] Step 2, the aldylation of polystyrene resin: get the treated polystyrene resin in step 1 and swell in carbon disulfide solution for 5-12 hours, add p-chlorobenzaldehyde under ice-water bath conditions, and treat that p-chlorobenzaldehyde is completely After dissolving, add aluminum bromide and keep it in the ice-water bath for 1-3 hours. After the ice-water bath is over, place it in an air-bath shaker at 25-40°C to react for a certain period of time; Washing and filtering with water for several ti...
Embodiment 1
[0026] Example 1: Weigh 0.5g of polystyrene resin microspheres, add dichloromethane to swell for 20 hours, wash and filter with tetrahydrofuran, ultrapure water, absolute ethanol and methanol several times in sequence, and finally vacuum-dry at 40°C to constant weight .
[0027] Aldehydation of polystyrene resin microspheres: Weigh 0.3 g of pretreated polystyrene resin white balls into a 250ml Erlenmeyer flask, add 50ml of carbon disulfide to swell for 12 hours, add 5g of p-chlorobenzaldehyde under ice-water bath conditions , after p-chlorobenzaldehyde is completely dissolved, add 2g of anhydrous aluminum bromide and continue to keep the ice-water bath for 3 hours, then place it in an air bath shaker at 40°C for 12 hours to react. The reaction was completed by suction filtration, and washed and filtered with tetrahydrofuran, dilute hydrochloric acid and ultrapure water respectively. Vacuum-dry at 40°C until constant weight to obtain aldylated polystyrene resin microspheres. ...
Embodiment 2
[0028] Example 2: Weigh 0.5g of polystyrene resin microspheres, add dichloromethane to swell for 5 hours, wash and filter with tetrahydrofuran, ultrapure water, absolute ethanol and methanol several times in sequence, and finally vacuum-dry at 20°C to constant weight .
[0029] Aldehydation of polystyrene resin microspheres: Weigh 0.3 g of pretreated polystyrene resin white balls into a 250ml Erlenmeyer flask, add 50ml of carbon disulfide to swell for 5 hours, then add 4g of p-chlorobenzaldehyde in an ice-water bath , after p-chlorobenzaldehyde is completely dissolved, add 2g of anhydrous aluminum chloride and continue to keep the ice-water bath for 1 hour, then place it in an air bath shaker at 25°C for 15 hours to react. The reaction was completed by suction filtration, and washed and filtered with tetrahydrofuran, dilute hydrochloric acid and ultrapure water respectively. Vacuum-dry at 20°C until constant weight to obtain aldehydated polystyrene resin microspheres. Its we...
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