阅读说明：本技术 气动输送超吸收性颗粒的方法 (Method for pneumatically conveying superabsorbent particles ) 是由 S·鲍尔 K·鲍曼 M·滕内森 T·丹尼尔 H·R·沃尔夫 于 2019-01-28 设计创作，主要内容包括：本发明涉及一种气动输送超吸收性颗粒的方法,在气动输送之前将超吸收性颗粒与水性蜡分散体混合,所述蜡的玻璃化转变温度为至少65℃,并且相对于未处理的超吸收性颗粒,使用0.020重量％至0.20重量％的蜡。(The invention relates to a method for pneumatically conveying superabsorbent particles, the superabsorbent particles being mixed with an aqueous wax dispersion prior to pneumatic conveying, the wax having a glass transition temperature of at least 65 ℃ and 0.020% to 0.20% by weight of wax relative to untreated superabsorbent particles.)

1. A method of pneumatically conveying superabsorbent particles wherein the superabsorbent particles are mixed with an aqueous wax dispersion prior to pneumatic conveyance, the wax having a glass transition temperature of at least 65 ℃, and from 0.020% to 0.20% by weight of wax, based on untreated superabsorbent particles, is used.

2. The method of claim 1, wherein the wax has a glass transition temperature of at least 80 ℃.

3. A method according to claim 1 or 2, wherein 0.035 to 0.08% by weight of wax, based on the superabsorbent particles, is used.

4. The method of any one of claims 1 to 3, wherein the wax is a copolymer of 70 to 95 mol% of at least one ethylenically unsaturated hydrocarbon and 5 to 30 mol% of at least one ethylenically unsaturated carboxylic acid.

5. The method according to any one of claims 1 to 4, wherein the superabsorbent particles have an average particle size of from 250 to 500 μm.

6. The method of any one of claims 1 to 5 wherein the superabsorbent particles have an Average Sphericity (ASPHT) greater than 0.72.

7. The method of any one of claims 1 to 6 wherein the temperature of superabsorbent particles during pneumatic conveying is at least 40 ℃ and at least 20 ℃ below the glass transition temperature of the wax.

8. The method of any one of claims 1 to 7, wherein in pneumatic conveying the initial gas velocity corresponds to a Froude number of from 2 to 40.

9. The method according to any one of claims 1 to 8, wherein in pneumatic conveying the load of conveyed material is 1 to 30kg/kg and the load of conveyed material is the quotient of the mass flow rate of conveyed material and the gas mass flow rate.

10. A composition comprising superabsorbent particles and wax particles, wherein the wax particles are located on the surface of the superabsorbent particles, the wax particles are dispersible in water and have a glass transition temperature of at least 65 ℃, the proportion of the wax particles based on the superabsorbent particles is from 0.02 wt% to 0.2 wt%, and the absorption of the composition under 4.83kPa pressure (AUL 0.7psi) is at least 10 g/g.

11. The composition of claim 10, wherein the wax has a glass transition temperature of at least 80 ℃.

12. Composition according to claim 10 or 11, wherein 0.035 to 0.08% by weight of wax, based on the superabsorbent particles, is used.

13. The composition of any one of claims 1 to 12, wherein the wax is a copolymer of 5 to 30 mol% of at least one ethylenically unsaturated carboxylic acid and 70 to 95 mol% of at least one ethylenically unsaturated hydrocarbon.

14. The composition according to any one of claims 10 to 13, wherein the superabsorbent particles have an average particle size of from 250 to 500 μ ι η.

15. The composition of any one of claims 10 to 14 wherein the superabsorbent particles have an Average Sphericity (ASPHT) greater than 0.72.

Examples