阅读说明：本技术 一种聚丙烯过滤材料的制备方法 (preparation method of polypropylene filter material ) 是由 郭玉海 胡晓环 郭煜鑫 于 2019-10-14 设计创作，主要内容包括：本发明涉及一种聚丙烯过滤材料的制备方法,采用轧光、喷涂、烘燥工序加工而成。通过喷涂液中的无机颗粒在聚丙烯纺粘非织造布表面的有序堆积形成孔径可控的微孔,孔径为0.03-0.45微米之间。该方法工艺简单易行,加工成本低,对设备要求低。(The invention relates to a preparation method of a polypropylene filter material, which is processed by calendaring, spraying and drying. The inorganic particles in the spraying liquid are orderly stacked on the surface of the polypropylene spun-bonded non-woven fabric to form micropores with controllable pore diameters, wherein the pore diameters are between 0.03 and 0.45 micrometer. The method has the advantages of simple and easy process, low processing cost and low requirement on equipment.)

1. A preparation method of a polypropylene filter material comprises the following steps:

a. And (3) calendering: the polypropylene spun-bonded non-woven fabric enters a padder consisting of a metal roller and a rubber roller to obtain calendered polypropylene spun-bonded non-woven fabric;

b. Spraying: mixing inorganic particles, acrylic acid adhesive with the solid content of 20-40% and water, uniformly stirring to prepare spraying liquid, and spraying the spraying liquid on the calendered polypropylene spun-bonded non-woven fabric to obtain a sprayed polypropylene spun-bonded non-woven fabric;

c. Drying: and drying the sprayed polypropylene spun-bonded non-woven fabric through three sections to obtain the polypropylene filter material.

2. the method for preparing a polypropylene filter material as claimed in claim 1, wherein in the step b, the inorganic particles comprise one of silicon dioxide and titanium dioxide.

3. The method for preparing a polypropylene filter material as claimed in claim 1 or 2, wherein the size of the inorganic particles is 10 to 300 nm.

4. The method for preparing a polypropylene filter material as claimed in claim 1, wherein the weight ratio of the inorganic particles, the acrylic binder and the water is 1: 0.1-0.3: 5-20.

5. The method as claimed in claim 1, wherein in the step c, the three-stage drying is performed by heating the oven at 105 ℃ and 105 ℃ for 0.5-6 minutes, heating the oven at 110 ℃ and 105 ℃ for 0.5-6 minutes, and heating the oven at 120 ℃ and 110 ℃ for 0.5-6 minutes.

6. The method for preparing the polypropylene filter material as claimed in claim 1, wherein the polypropylene spunbonded nonwoven fabric is fed into a padder consisting of metal rollers and rubber rollers, the temperature of the metal rollers is 50-120 ℃, and the pressure of the padder is 0.1-0.5 MPa.

7. The method for preparing a polypropylene filter material as claimed in claim 1, wherein the amount of the spray coating in the step (b) is 10 to 30 g/m.

8. The method as claimed in claim 1, wherein the polypropylene filter material is heated in an oven at 200 ℃ for 0.5-4 minutes before entering the padder.

9. The polypropylene filter material prepared by the preparation method of the polypropylene filter material in claim 1, wherein the pore diameter is between 0.03 and 0.45 micron.

Technical Field

The invention belongs to the technical field of filter materials, and particularly provides a novel method for preparing a high-precision polypropylene filter material.

Background

The polypropylene non-woven material can be processed by a spun-bonding method, is widely applied to the fields of packaging, cushion, filtration, medical treatment and health, building and the like, and has the characteristics of high speed and low cost. The fiber is used in the field of filtration, and is generally used in rough filtration occasions due to large pores formed by the fiber. The requirement of precision filtration cannot be met.

disclosure of Invention

The invention aims to expand the application field of the existing product and provides a preparation method of a polypropylene filter material, which is processed by calendaring, spraying and drying procedures, and the aperture is controlled by an after-finishing technology, so that the filter precision of the filter material is greatly improved. The process is simple and easy to implement, the processing cost is low, and the requirement on equipment is low.

specifically, the preparation method of the polypropylene filter material comprises the following steps:

a. And (3) calendering: the polypropylene spun-bonded non-woven fabric enters a padder consisting of a metal roller and a rubber roller to obtain calendered polypropylene spun-bonded non-woven fabric;

b. Spraying: mixing inorganic particles, acrylic acid adhesive with the solid content of 20-40% and water, uniformly stirring to prepare spraying liquid, and spraying the spraying liquid on the calendered polypropylene spun-bonded non-woven fabric to obtain a sprayed polypropylene spun-bonded non-woven fabric;

drying: and drying the sprayed polypropylene spun-bonded non-woven fabric through three sections to obtain the polypropylene filter material.

Preferably, in the step b, the inorganic particles include one of silica and titania.

Preferably, the inorganic particles have a size of 10 to 300 nm.

preferably, the weight ratio of the inorganic particles, the acrylic binder and the water is 1: 0.1-0.3: 5-20.

Preferably, the amount sprayed in step (b) is from 10 to 30 grams per square meter.

preferably, in the step c, the three-stage drying is performed by sequentially heating the mixture in an oven at 105 ℃ and 100 ℃ for 0.5 to 6 minutes, in an oven at 110 ℃ and 105 ℃ for 0.5 to 6 minutes, and in an oven at 120 ℃ and 110 ℃ for 0.5 to 6 minutes.

Preferably, in step (a), the polypropylene spunbond nonwoven is fed into a calender consisting of metal rolls and rubber rolls, the temperature of the metal rolls is 50-120 ℃, and the calender pressure is 0.1-0.5 MPa.

Preferably, the steel is heated in an oven at 200 ℃ for 0.5 to 4 minutes at 130 ℃ before entering the padder.

the aperture of the polypropylene filter material obtained by the method is 0.03-0.45 micron.

Compared with the prior art, the preparation method of the polypropylene filter material has the following beneficial effects: the invention forms micropores with controllable pore diameters by orderly stacking inorganic particles on the surface of the polypropylene spun-bonded non-woven fabric; ordered stacking is controlled by two means: calendering treatment (step a) to make the surface of the polypropylene spun-bonded non-woven fabric smooth, and simultaneously adopting a three-stage drying (step c) process to slowly evaporate water in the spraying liquid, thereby achieving the effect of regular arrangement of inorganic particles; the acrylic binder controls the bond strength between the inorganic particles, and the inorganic particles to the polypropylene spunbond nonwoven (step b).

drawings

FIG. 1 is an ordered stacking diagram of inorganic silica particles on the surface of a polypropylene spunbonded nonwoven fabric.

Detailed Description