JPH01304018A - Preparation of filter material - Google Patents

Abstract

PURPOSE:To prepare an inexpensive filter material according to a mass production system, by forming an activated fiber having a bilateral structure based on a methylol derivative of a cellulose xanthate into spun yarn and heat-treating said spun yarn along with water. CONSTITUTION:An activated fiber having a bilateral structure based on a methylol derivative of cellulose xanthate is formed into spun yarn which is, in turn, heat-treated along with water to prepare a filter material. By this method, the activated fiber developed by a no-binder cellulose nonwoven fabric manufacturing process of a pons-bonding system due to a TCF (Te X tile Continuously Formed) method is improved as one for a filter material and the mass production of the inexpensive filter material can be achieved by consistent production from a raw material to the material while bulkiness is held as it is without losing the water and safety as the filter material possessed by the nonwoven fabric.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing a filter material for filtering impurities mixed in oil or the like.

[Prior art] When cellulose fiber is used as a filter material, the cellulose fiber is not thermoplastic in its normal state and has very weak self-adhesion due to hydrogen bonds, so when it gets wet, the hydrogen bonds break and it becomes like a piece of paper. It has the disadvantage of expanding and decomposing. but,
On the other hand, this cellulose fiber has excellent hydrophilicity and water absorption, and also has advantages such as thermal stability and safety.

On the other hand, when non-woven fabrics were expanded in the field of application, research and development of methods for interlacing TA fibers, binders, etc. brought about multifaceted progress. In many cases, cellulose nonwoven fabrics are made at the expense of thermal stability and safety.However, in the process from viscose to fiberization as binderless cellulose, there are some that are made using hydrogen bonding and reinforced entangling methods and active TCF (Textil), which skillfully takes advantage of the properties of synthetic fibers,
100% regenerated cellulose produced by the Continuously Foraid method is known. This intermediate fiber, TCP-activated Fa male, is formed by spinning viscose into a spinning bath containing a methylolating agent.

TCP-activated u&fiber is cellulose xanthate, a methylolated derivative whose main component is hydroquine methyl φ cellulose xanthate (hereinafter referred to as HMCX). HMCX is a viscose spinning stage, and as shown in Figure 1, cellulose 1, HMCX 2, and hisodium cellulose xanthate (hereinafter referred to as NaCX) 3 are
It forms a three-phase structure distributed concentrically. By drawing the fiber in this state, a TCP-activated fiber having a pilateral structure as shown in FIG. 2 can be obtained.

This TCP activation 1m! The characteristic properties exhibited by i are exhibited by each constituent material. NaCX3 serves as a skeletal structural material to hold the water, and also exhibits water absorbing properties as a strongly hydrophilic component.

Nonwoven fabrics are made by dispersing these activated fibers in water to form a web.
It is made by heat pressing. In order to use this nonwoven fabric as a filter material, for example, it is first cut into strips and then twisted into strings.

However, manufacturing a filtration material by such means has the problem of increasing the number of steps.

[Object of the Invention] The object of the present invention is to solve the above-mentioned problems, to provide a filtration material that can be produced directly from activated fibers, fully utilizes the liquid filtration properties of the activated mix, and can be supplied in large quantities and at low cost. The purpose of this invention is to provide a method for manufacturing the same.

[Summary of the invention] The gist of the present invention is to achieve the above objects.

Activated fibers with a pithral structure mainly composed of a methylolated derivative of cellulose xanthate are formed by spinning,
This is a method for producing a filter material, characterized in that the spun yarn is heat-treated with water to produce a filter material.

[Embodiments of the Invention] This filtration material is manufactured by using the above-mentioned TCP activated fibers through the following steps. (1) One yarn-like yarn is formed by collective spinning.

(2) Heat treatment with water develops shrinkage and crimpability to add bulkiness for spinning, softening the active state to stable regenerated cellulose without thermoplasticity and establishing the structure of the yarn.

(3) Remove impurities by smelting and drying.

When HMCX is heated with water, it becomes viscous and diffusion occurs between the contacting fibers, and the HMCX component is converted to cellulose, which further loses its thermoplasticity and causes strong fusion due to hydrogen bonding.

the shrinkage properties of the HMCX component during its conversion to cellulose;
It exhibits crimpability, and the contractile force reaches its maximum in about 10 seconds, and the maximum contractile force is about 13 mg/d. The fibers that have been converted in this way become wavy, crimped fibers that have a pilateral cross-section, and have the ability to remove even the finest impurities as shown in their filtration properties, as well as unparalleled water retention. will have the following.

Regarding the actual use of the filter material manufactured in this way, it is suitable to apply it to an oil filter or the like. In an oil filter, an inner cylinder made of metal such as punched metal with a large number of small holes is surrounded by an inner cylinder.
! It has a structure in which the outer material is wrapped around it and the outer side is surrounded by an outer cylinder made of a cylindrical metal tube. Then, when oil is poured between the inner cylinder and the outer cylinder, impurities in the oil are filtered out as it passes through the filter material wrapped around the inner cylinder. 11! By wrapping the filter material around the inner cylinder in a honeycomb shape with a density gradient, in addition to the various passageways and large surface area obtained, a combination of the various pore spacings of yarn-like spinning and the microscopic pores of fibers can be obtained. This allows extremely large and diverse filtration to be carried out.

[Effect of the Invention 1 As explained above, the method for manufacturing the filtration material according to the present invention is an activated tJj!
By improving the nonwoven fabric for use as a filtration material, and without sacrificing the water absorption, thermal stability, and safety properties of nonwoven fabric as a filtration material, and while maintaining the same bulk properties, we have integrated production from raw materials to materials. An inexpensive filtration material can be obtained.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of cellulose at the viscose spinning stage, and Figure 2 is a cross-sectional view of an activated nonwoven fabric with a biteral structure. Patent applicant Takano Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] 1. Production of a filtration material characterized by forming activated fibers with a biteral structure mainly composed of a methylolated derivative of cellulose xanthate into a spun fiber, and heat-treating the spun fiber with water to produce a filtration material. Method.