WO2018209800A1

WO2018209800A1 - High-mechanical-strength activated carbon filter paper and method for producing same

Info

Publication number: WO2018209800A1
Application number: PCT/CN2017/093756
Authority: WO
Inventors: 施志泉; 施振亚
Original assignee: 南通美亚新型活性炭制品有限公司
Priority date: 2017-05-17
Filing date: 2017-07-20
Publication date: 2018-11-22
Also published as: CN107083722A

Abstract

Disclosed is a high-mechanical-strength activated carbon filter paper. The activated carbon filter paper is made of a sulphite softwood pulp, PET fibrids, a PE/PET sheath-core composite chopped fiber, and an internal sizing agent, wherein the internal sizing agent is chitosan fiber. A method for producing the activated carbon filter paper comprises (1) preparation of sulphite softwood pulp: a sulphite softwood pulp is conventionally beaten with a beating consistency of 5-7%, a crushing time of 30-60 min, and a beating degree of 40-50° SR; (2) preparation of PET pulp: a PET pulp is beaten with a beating consistency of 1-5%, a crushing time of 10-30 min, and a beating degree of 20-40° SR; and (3) mixing and stirring: activated carbon powder is mixed and stirred uniformly with the sulphite softwood pulp, PET fibrids, a PE/PET sheath-core composite chopped fiber, and a chitosan fiber, followed by blending on a paper machine with a slurry concentration on a net of 0.1-0.3%.

Description

High mechanical strength activated carbon filter paper and production method thereof

Technical field

The invention relates to the technical field of preparation of activated carbon filter paper, in particular to a high mechanical strength activated carbon filter paper and a production method thereof.

Background technique

Filter paper is an effective filter medium, and filter paper has been widely used in various fields. Depending on the type of fiber constituting the filter paper, the performance and use of the filter paper are also different. There are ordinary filter papers for general occasions, glass fiber filter papers for high temperature, and polypropylene filter papers for ultra-clean. Paint filter paper is also called V-type dry filter paper, organ-type spray cabinet filter, paint mist filter paper (folded filter paperboard). It is a new type of environmentally friendly product used in dry spray booths. It uses environmentally friendly filter paper; it makes the spray/paint no longer have water and is no longer contaminated! It can effectively filter paints, oils, glass materials, epoxy resin, asphalt, Teflon, liquefied workpieces, plastics, porcelain, dyes, coatings.

The activated carbon material is obtained by processing the amorphous carbon, has a large specific surface area, and has good adsorption capacity for gases, inorganic or organic substances in the solution, and colloidal particles. Activated carbon materials mainly include activated carbon and activated carbon fibers. As an excellent adsorbent, activated carbon material is mainly determined by its unique adsorption surface structure and surface chemical properties. Activated carbon material has stable chemical properties, high mechanical strength, acid resistance, alkali resistance, heat resistance, insoluble in water and organic solvents, and can be recycled. It has been widely used in chemical industry, environmental protection, food processing, metallurgy, pharmaceutical refining, military chemical protection. And so on. At present, modified activated carbon materials are widely used in the fields of sewage treatment, air pollution prevention and other fields, and increasingly show their attractive prospects in the treatment of environmental pollution.

The main raw material of activated carbon can be almost all carbon-rich organic materials, such as coal, wood, husk, coconut shell, walnut shell, apricot shell, jujube shell and so on. These carbonaceous materials are converted to activated carbon by pyrolysis at elevated temperatures and pressures in an activation furnace. During this activation process, huge surface area and complex pore structure are gradually formed, and the so-called adsorption process is carried out in these pores and on the surface. The size of the pores in the activated carbon has a selective adsorption effect on the adsorbate. Since the macromolecule cannot enter the pore size of the activated carbon smaller than its pores. Activated carbon is a hydrophobic adsorbent prepared from a carbon-containing material as a raw material and carbonized and activated at a high temperature. Activated carbon contains a large number of micropores, has a huge surface area, can effectively remove chromaticity and odor, and can remove most organic pollutants and certain inorganic substances in secondary effluent, including some toxic heavy metals.

The advantages of activated carbon are combined with the process of preparing filter paper, so that the filter paper has antibacterial ability, but its application range is small, and it does not have wide applicability. At the same time, the conventional sizing agent required in the process of preparing this type of filter paper easily affects the performance of the activated carbon, causing a certain deviation from the intended utility of the filter paper.

Summary of the invention

The object of the present invention is to provide a high mechanical strength, a certain antibacterial ability, and a low cost increase, and expand the use range of the activated carbon filter paper. Because chitosan fiber is used as a reinforcing sizing agent to replace the previous starch, PAE, AKD, acrylate sizing agent, the paper has little influence on the specific surface area of activated carbon, and has higher adsorption performance to solve the above background art. The problem.

In order to achieve the above object, the present invention provides the following technical solution: a high mechanical strength activated carbon filter paper, which is composed of sulfite sub-coniferous pulp, PET fibrid, PE/PET sheath core. The chopped fibers and the sizing agent are composed of the following weight percentage components:

Preferably, the in-sizing sizing agent is a chitosan fiber.

The method for producing the high mechanical strength activated carbon filter paper comprises the following steps:

(1) Preparation of sulfite sub-needle pulp, the beryllium sulfite pulp is beaten according to the conventional process requirements, the beating concentration is 5-7%, the dissolving time is 30-60 min, and the beating degree is 40-50°SR;

(2) Preparation of PET pulp, taking PET pulp, the pulping concentration is 1-5%, the dissolving time is 10-30 minutes, and the beating degree is 20-40°SR;

(3) Mixing and stirring, mixing activated carbon powder with sulfite needle blade pulp and PET fibrid, PE/PET sheath core composite chopped fiber, chitosan fiber, mixing and evenly, and copying on paper machine, paper machine net pulp The material concentration is 0.1-0.3%.

Preferably, the PE/PET sheath-core composite chopped fibers have a diameter of 10-40 nm and a length of 480-1100 nm.

Compared with the prior art, the beneficial effects of the present invention are:

(1) The activated carbon filter paper prepared by the invention has high mechanical strength, a certain antibacterial ability, and a low cost increase compared with the conventional activated carbon paper, and expands the use range of the activated carbon filter paper. Because chitosan fiber is used as a reinforcing sizing agent to replace the previous starch, PAE, AKD, acrylate sizing agent, the paper has little influence on the specific surface area of activated carbon and has high adsorption performance.

(2) In the present invention, the natural fiber has a high specific surface area by sticking, and the activated carbon powder has a high retention rate, is not easily lost, and saves cost. Synthetic fibers enhance paper stiffness and water resistance. The carbon content can be increased to 40-50%. Does not contain traditional sizing agents and does not affect the performance of activated carbon.

(3) High mechanical strength activated carbon filter paper has high mechanical strength and is suitable as a VOCs adsorption filter paper for air.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described below. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The invention provides a technical scheme: a high mechanical strength activated carbon filter paper, which comprises a composition of the following weight percentages from sulfite needlewood pulp, PET fibrid, PE/PET sheath core chopped fibers and a slurry sizing agent according to the following weight percentages; composition:

The in-sizing sizing agent is chitosan fiber. The natural fiber has a high specific surface area by sticky beating, and the activated carbon powder has a high retention rate, is not easy to be lost, and saves cost. Synthetic fibers enhance paper stiffness and water resistance. The carbon content can be increased to 40-50%. Does not contain traditional sizing agents and does not affect the performance of activated carbon.

The activated carbon filter paper prepared by the invention has high mechanical strength, certain antibacterial ability and low cost increase compared with the conventional activated carbon paper, and expands the use range of the activated carbon filter paper. Because chitosan fiber is used as a reinforcing sizing agent to replace the previous starch, PAE, AKD, acrylate sizing agent, the paper has little influence on the specific surface area of activated carbon and has high adsorption performance.

The PE/PET sheath-core composite chopped fibers used therein have a diameter of 10-40 nm and a length of 480-1100 nm. The activated carbon filter paper is loaded with activated carbon powder by using sulfite needlewood pulp and PET pulp as a carrier. The PE/PET sheath-core composite chopped fiber is used for reinforcement and bridging. The chitosan fiber acts as an antibacterial and intra-sizing sizing agent. Among them, the dry quality of sulfite softwood pulp accounts for 20-30% of the absolute dry mass of activated carbon filter paper, PET pulp accounts for 10-15%, PET chopped fiber accounts for 6-10%, and chitosan fiber accounts for 2- 5%. Therefore, the high mechanical strength activated carbon filter paper has high mechanical strength and is suitable as a VOCs adsorption filter paper for air.

Although embodiments of the invention have been shown and described, it is common to the art It is to be understood that the scope of the invention is defined by the appended claims and their equivalents.

Claims

The invention relates to a high mechanical strength activated carbon filter paper, which is characterized in that: arylene sulfite wood pulp, PET fibrid, PE/PET sheath core chopped fiber and internal sizing agent are composed according to the following weight percentage components:
A high mechanical strength activated carbon filter paper according to claim 1, wherein said intragranular sizing agent is a chitosan fiber.
A method for producing a high mechanical strength activated carbon filter paper according to claim 1, comprising the steps of:

(1) Preparation of sulfite sub-needle pulp, the beryllium sulfite pulp is beaten according to the conventional process requirements, the beating concentration is 5-7%, the dissolving time is 30-60 min, and the beating degree is 40-50°SR;

(2) Preparation of PET pulp, taking PET pulp, the pulping concentration is 1-5%, the dissolving time is 10-30 minutes, and the beating degree is 20-40°SR;

(3) Mixing and stirring, mixing activated carbon powder with sulfite needle blade pulp and PET fibrid, PE/PET sheath core composite chopped fiber, chitosan fiber, mixing and evenly, and copying on paper machine, paper machine net pulp The material concentration is 0.1-0.3%.
The method for producing a high mechanical strength activated carbon filter paper according to claim 3, wherein the PE/PET sheath core composite chopped fibers have a diameter of 10-40 nm and a length of 480-1100 nm.