JPS6344916A - Manufacture of air filter paper - Google Patents

Abstract

PURPOSE:To carry out a neutral paper manufacturing and increase yield of superfine glass fiber by adding fiber-shaped vinylon binder to superfine glass fiber and chopped strand rayon fiber. CONSTITUTION:By using copped strand rayon fiber more hydrophilic than chopped strand glass fiber, paper can be manufactured by water. To enhance dispersing stability of superfine glass fiber and chopped strand rayon fiber in water, surface active agent or binder can be used. As both of fibers have no self-binding properties, fiber-shaped vinylon binder is added. The adding percentage is preferably 1-10%. By modifying the diameter of superfine glass fiber within a range of 0.3-4mum or changing blending ratio to 5-90 part, filtered paper of medium and high performance is manufactured.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention manufactures air filter paper using ultrafine glass fibers and chopped strand long fibers as main raw materials and wet-paper-making with water using an internal binder. In more detail, '=Ji average fiber warp diameter 3 to 4.
By using Koe's ultra-fine glass #a fiber and Chop Toss 1~Rand Rayon fiber as the main raw materials, and using a fibrous vinylon binder internally, the yield of ultra-fine glass fiber is good, so it can be used for medium to ultra-high performance applications. The present invention relates to a method for producing air filter paper that enables the production of furnace materials used in air filters of various grades up to high performance.

[Conventional technology]

Filter paper, which is used as a material for air filters, is mainly made of ultra-fine glass fibers, which are responsible for the dust collection rate (hereinafter referred to as collection rate), and chopped strand glass fiber, which is responsible for the tensile strength. However, due to the weak hydrophilicity of the glass surface, the 19th Paper and Pulp Symposium Abstracts No. 9-19 due to its disintegration and dispersibility.
(1984), sulfuric acid acid water (pt.
13.2 or less), and since glass fiber F does not have self-adhesive properties like bulbs, it is manufactured by impregnating wet paper with an acrylic emulsion binder and drying and curing it in a dryer. was.

[Problem that the invention seeks to solve]

When sulfuric acid acid water is used in wet paper making, in addition to problems such as work safety and corrosiveness of equipment, part of the ultra-fine glass fibers, which affect the collection rate, dissolves and the yield rate decreases. It is desirable to perform wet paper making at neutrality, since the performance as an air filter paper decreases.

Additionally, if an acrylic emulsion binder is added to a wet paper using the impregnation method, some of the ultrafine glass fibers that are involved in the collection rate will come out of the sheet during water replacement, resulting in a decrease in yield and a decrease in filter performance. r) It is necessary to develop an effective addition method, including the selection of a binder.

[Means and effects for solving the problems] As a result of intensive study to solve the problems, we decided to use chopped strand rayon fiber, which is more hydrophilic than chopped strand glass fiber. It was discovered that paper making using water becomes possible. If necessary, a surfactant or a sticky agent may be used in combination with the ultrafine glass fibers and chopped strand rayon fibers to enhance the dispersion stability in water. As such, vinylon fiber, acrylic fiber, acetate-1 fiber, copper ammonia fiber, etc. may be used in combination with rayon fiber.

In addition, chop toss 1-land with ultra-fine glass fiber.
Since rayon fibers do not have self-adhesive properties, it is essential to use a binder, but if a fibrous vinylon binder is added internally, the same tensile strength can be achieved with a smaller amount of binder than the conventional impregnation method. It has also been found that the filter performance is improved because the yield of ultrafine glass fibers is improved. The addition rate of the fibrous vinylon binder used is 1 to 10% (based on fibers), preferably 3 to 10% (based on fibers).
It is 6%. If the addition rate is less than 1%, the resulting sheet will have a low tensile strength, while if it exceeds 10%, the tensile strength will be high but the filter performance will be extremely deteriorated, which is not preferable.

In addition, by combining the water-neutral wet papermaking method with the internal addition of a fibrous vinylon binder, it is possible to improve the yield of ultrafine glass fibers, which are involved in the collection rate. Therefore, by changing the fiber diameter of the ultra-fine glass fiber used to 0.3 to 4p, or by changing the blending ratio to 5 to 90 parts, various grades of air filter paper from medium performance to ultra high performance can be manufactured. We also found that it is possible to separate them. If the blending ratio of ultra-fine glass fiber is less than 5 parts, many pinholes will occur in the sheet, making it impossible to ensure the collection rate, while if it is more than 90 parts, the tensile strength of the sheet will decrease, which is undesirable. .

In the present invention, there is no problem in using a water repellent to ensure water repellency or a flame retardant to ensure flame retardancy.

〔Example〕

In order to further explain the present invention in detail, specific examples will now be described.

Example] 44j $111 Glass fiber with trade name Evans 50
6 (0.54~0.68Pφ) (manufactured by Evans) 12
g, 17.8 g of chopped strand rayon fiber (trade name Corona SB2×5 (manufactured by Daiwabo Co., Ltd.)
solid content 45%) and a fibrous vinylon binder with the trade name SMM (manufactured by Unitika Kasei Co., Ltd., 0.2 g (solid content 5
0%) in the TAPPI disintegrator, add 2Q of water and boil for 30 minutes.
After disintegrating for seconds, 8 fl of water was added and the product name was SV-5.
The mixture was stirred for 5 minutes using a 38A type (manufactured by Takasaki Seisakusho) reversible agitator. Is the basis weight of the air filter paper from which this slurry liquid can be obtained approximately 75 g/rr? Collect the samples in a manner similar to that, add water to make a total volume of 4Q, stir for 3 minutes in an inverted agitator, and then use a self-made Bunkata JIS style hand paper machine (wire mesh area: 0.0191
After drying with a cylinder dryer, the texture was visually determined. This air filter paper was then flame-retardant treated with Avinon 101 (trade name, manufactured by Sansho Chemical Co., Ltd.) and water-repellent treated with TSW8251 (trade name, manufactured by Toshiba Silicon Co., Ltd.). The filter performance was evaluated.

Ratio 1 Shark Example 1-] Instead of Jotsubu 1~Stran 1-/Rayon fiber, use 8g of Jiyotsubu Stran 1/Glass fiber (made by Fiber Class Co., Ltd. with a body of 9 φ~ and a force of 11), and use water instead of O. Example 1 was carried out in the same manner as in Example 1, except that sulfuric acid acidic water with a pH of 2.5 was used.

Comparative Example 1-2 The same procedure as in Example 1 was carried out except that sulfuric acid water with a pH of 2.5 was used instead of water.

Comparative Example 1-1- The same procedure as Example 1 was carried out except that 0.3 g of 23S was used instead of 1.2.

Comparative Example]-4 The same procedure as in Example 1 was carried out except that 4.8 g of 5MM was used instead of 1.2 g.

Ratio, IR Example 1-1 Instead of using 1.2 g of 5S, a 1.5% aqueous solution of 5G-51-2 (trade name, manufactured by Tosuli Gosei Kagaku Kogyo Co., Ltd.), which is a styrene-acrylic emulsion binder, was used by an impregnation method. The same procedure as in Example 1 was carried out except that the following was used.

Example 2 Ultra-fine glass fiber with trade name Manville 100 (0.29
~0, 327a++φ) (manufactured by Manville) 4g and chopped strand 1-rayon fiber Corona 5R2X5
(manufactured by Daiwabo Co., Ltd.) using 35.6g, T A P
The same procedure as in Example 1 was carried out except that the mixture was treated with I disintegrator for 1 minute.

Example 3 Ultra-fine glass fiber with trade name Evans 504 (0,3
! 1~0.531Jnφ) (manufactured by Evans) 2g and Choptos J-Land Rayon Fiber Corona 5B2x5
The same procedure as in Example 1 was carried out except that 10 g of (manufactured by Daiwabo Co., Ltd.) was used.

Comparative Example 3-1 Evans 504 as ultra-fine glass fiber with O, Sg and Choptos J-Land Rayon Fiber Corona 5112×
The same procedure as in Example] was carried out except that 43.4 g of 5 was used.

Example 4 As an ultrafine glass fiber, the trade name Evans 510 (2,5~
The same procedure as in Example 1 was conducted except that 18 g of Chopped Soft-H Land Rayon Fiber Corona 5R2X5 (Daiwa Boseki JJQ) was used.

Comparative Example 4-1 (19 g of Evans 510 as 41 fine glass [1,
Jotupdos 1~Rand Rayon Fiber Corona SR2×
The same procedure as in Example] was carried out except that 2.3 g of No. 5 was used.

Below margin -8 = Abundant BaG3-44916 (4) [Effects of the invention] Table 1 shows the manufacturing results of the ultra-high performance air filter paper. Example 1. As shown in Example 2, if the method invented this time is used, the pressure loss is low and the dust collection rate is 0.
37zm diameter DOP smoke collection rate is also the standard 9
9.97% or more is fully satisfied, and the tensile strength of the product is also ik.
It is possible to manufacture ultra-high performance air filter paper that ensures g/15 mn or more. On the other hand, as shown in Comparative Example], -1, when paper was made using sulfuric acid acid water using chop toss 1-run 1~, the smoke collection rate of 0.3 cape diameter DO11 was extremely reduced to the standard value. It became the following. In addition, even if the similar chopped strand 1-rayon fiber shown in Comparative Example]-2 is used, when paper is made using sulfuric acid acid water, the DOP smoke collection rate of 0.37a diameter is lower than that of Comparative Example 1- As in 1, it decreased to below the standard value. Also, Comparative Example 1-3
As shown in Figure 2, even if chopped strand rayon fibers are used to make paper with water neutralization, when the addition rate of fibrous vinylon binder falls below the appropriate range of 1f@, the tensile strength of the sheet decreases extremely. On the other hand, as shown in Comparative Example]-1-4, when the amount exceeds the appropriate range, the tensile strength of Sea 1- becomes high, but the filter performance becomes high pressure loss and low collection rate.
becomes extremely worse. In addition, as shown in [Comparative Example]--5, if an emulsion type styrene/acrylic binder is used by the impregnation method instead of using the fibrous vinylon binder by the internal addition method, the binder amount is doubled and the same result is obtained. Although the tensile strength decreased, the 0.31 An diameter DOP smoke collection rate decreased.

Next, Table 2 shows the manufacturing results of medium- to high-performance air filter paper, which has a 0.3 door diameter 1] OP smoke collection rate lower than that of ultra-high-performance paper. Example 3. As shown in Example 4, if the method invented this time is used, it can be used not only for ultra-high performance.
We were also able to produce air filter paper for medium and high performance. However, as shown in Comparative Example 3-1, when the blend of ultra-fine glass fibers becomes 5-jaw, a large number of pinholes occur, resulting in an extremely poor collection rate of 0 and 37 nn diameter DOP smoke. . Furthermore, as shown in Comparative Example 4-1, when 90 parts of ultrafine glass fiber were used in Claw-1, the blending effect of the chopped strand rayon fiber was reduced, and the tensile strength of C-1 was lowered.

As shown in the figure below, the main raw materials are ultra-fine glass fibers with an average fiber diameter of 0.3 to 4 tones and chopped strand rayon fibers, and by internally adding a fibrous vinylon binder, it is neutralized by water. Paper making has become possible, and the yield of ultra-fine glass fibers has been improved, making it possible to manufacture various grades of air filter paper from medium to ultra-high performance.

Patent applicant: Sanyo Konsaku Pulp Co., Ltd. -] 2 - Procedural amendment June 13, 1988 Commissioner of the Japan Patent Office Black 1) Akira Alt 1, Indication of the case Patent application 188677 So 2, Name of the invention Air Method for manufacturing filter paper 3, relationship with the amended case Patent applicant address 1-4-5 Marunouchi, Chiyoda-ku, Tokyo Name (23/
l) Sanyo Kokusaku Valve Co., Ltd. President and CEO Tadami Nasu 4, Agent 〒1. OO Address 1-4 Marunouchi, Chiyoda-ku, Tokyo. -5 Eiraku Bi Jl/
Room 234 Telephone 214-286] Number ■ Name (701,
0) Patent Attorney Tadayuki Noma, -m-\, 6. We will amend the following points in Column 7 of the detailed explanation of the invention of the specification subject to amendment, Supplementary IT: 11).

(1) Page 2, line 16 [Summary page 9-19] [Corrected as abstract page 9-19 j.

(2) Page 3, line 73 It says "wet paper making" We will correct it to "wet paper making".

(:3) Page 4, 1st line It says "with rayon fiber" I would like to add "rayon fiber".

(4) Page 12, line 16 [I [The result is 0.3 prnJ] [The result will be 0.37sJ.

-Yo-

Claims (1)

[Claims] 1. Ultrafine glass fibers with an average fiber diameter of 0.3 to 4 μm and chopped strand rayon fibers are the main raw materials, and a fibrous vinylon binder is added internally to the fibers in an amount of 1 to 10%, and a neutral wet process is performed. A method for producing air filter paper, which comprises paper-making. 2. The method for producing air filter paper according to claim 1, wherein the blending ratio of ultrafine glass fibers and chopped strand rayon fibers is 5:95 to 90:10.