JPS6344915A - 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 acrylic fiber. CONSTITUTION:By using chopped strand acrylic 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 acrylic 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 Field of Application] The present invention is an air filter paper that uses ultrafine glass fibers and chopped strand long fibers as main raw materials and is wet-paper-made using water using an internal binder. This article relates to the method, and more specifically, the main raw materials are ultrafine glass fibers with a qz uniform fiber diameter of 0.3 to 4 μm and chopped strand acrylic fibers, and by using an In II type vinylon binder internally added. 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 from medium performance to ultra-high performance because the yield of glass fiber is good.

[Conventional technology]

The filter paper used as the furnace 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 fibers, which are responsible for the tensile strength. Although it is wet paper-made,
Because the hydrophilicity of the glass surface is weak, due to its dispersion and dispersion properties, sulfuric acid acidic water (pH 3
.

[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, some of the ultrafine glass fibers that are involved in the collection rate dissolve, reducing the yield and causing air pollution. Since the performance as a filter paper deteriorates, it is desirable to make wet paper in a neutral condition.

In addition, if an acrylic emulsion binder is added to the wet paper by the impregnation method, a portion of the 14-fine glass fibers M1, which are involved in the collection rate, will come out from the sheets 1 to 1 during water replacement, resulting in a decrease in yield. However, since the filter performance deteriorates, it is necessary to develop an effective addition method, including the selection of a binder. As a result of intensive study to solve the following problems, we found that chopped strand acrylic is more hydrophilic than chopped strand glass fiber. We have discovered that paper making using water is possible by using a fiber cutter.Additionally, if necessary, an ultra-fine glass fiber cutter and chop 1-strand acrylic fibers can be disintegrated in water to improve the dispersion stability. A surfactant or a sticky agent may be used in combination, and vinylon fiber, rayon fiber, acetate fiber, copper ammonia fiber, etc. may be used in combination with acrylic fiber as the chopped 1-land long fiber.

In addition, along with ultra-fine glass fiber, chop toss 1 to land
Since acrylic fibers do not have self-adhesive properties, it is essential to use a binder. However, 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 3%, 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 poor, 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 increase the yield of ultrafine glass fibers, which are involved in the collection rate, by -1. Therefore, by changing the fiber diameter of the ultrafine glass fiber used from 0.3 to 477 In or by changing the blending ratio from 5 to 90 parts, various grades of air filter paper from medium performance to ultra high performance can be produced. We also found that it is possible to differentiate between the two. If the blending ratio of ultra-fine glass fibers is less than 5 parts, many pinholes will occur in the sheet and the collection rate cannot be ensured, while if it is more than 90 parts, the tensile strength of the sheets will be low. 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.

As an example of ultra-fine glass fiber, the product name Evans 506 (0.54
~0, 6877Illφ) (manufactured by Evans Corporation) (manufactured by Evans Corporation) (12 g), chop 1 strand of acrylic fiber (trade name: Al0L-1,5X5 (manufactured by Asahi Kasei Industries, Ltd.) 11.5
g (70% solids).

Put 1.2 g (solid content 50%) of the trade name SMM (manufactured by Unitika Kasei Co., Ltd.) as a fibrous vinylon binder into a TAPPI disintegrator, add 2Q of water and disintegrate for 30 seconds, then add 8Q of water and make the product under the trade name SV. The mixture was stirred for 5 minutes using a reversible agitator model -538A (manufactured by Takasaki Seisakusho). The air filter paper from which this slurry liquid is obtained is sampled so that its basis weight is about 75 g/i, water is added to make the total volume 4a, and after stirring for 3 minutes in an inverted agitator, it is made into a homemade round JIS style hand paper. Air filter paper was made using a device (wire mesh area: 0.0191rr11, mesh spacing: 75 mesh), and after drying using a cylinder dryer, the formation was visually determined.

Furthermore, this air filter paper is manufactured under the product name Avinon 101.
After flame retardant treatment (manufactured by Sanso Chemical Co.), the product name is TS.
After water-repellent treatment using Id8251 (manufactured by Toshiba Silicon Corporation), filter performance was evaluated using a self-made flat sheet filter paper evaluation device.

Comparative Example 1-1 Chopped strand glass fiber (9 tiles 1φ~6 mm +
The same procedure as in Example 1 was carried out, except that 8 g of 1) H2,5 sulfuric acid acid water was used instead of water.

Comparative Example 1-2 The same procedure as in Example 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 in Example 1 was carried out except that 0.3 g of -3S was used instead of 1.2 g.

Comparative Example 1-4 The same procedure as in Example 1 was carried out except that 4.8 g of Sl-4S,+ was used instead of 2 g.

Comparative Example 1-1 -5S 1.2. , instead of using a styrene-acrylic emulsion binder, product name 5G-5]-2(
East 111i Synthetic Chemical Industry Association'? J,) The same procedure as in Example 1 was carried out except that a 1.5% aqueous solution was used in the impregnation method.

Example 2 Product name Manville +00 (as a glass fiber wholesaler)
0,24'1~O, 432μIIφ) (manufactured by Manville)
4g and chopped strand 1/acrylic fiber Al0
I-1,5X 5 (manufactured by Kakasei Kogyo Co., Ltd.) at 22. ! '1
The same procedure as in Example 1 was carried out, except that the sample was treated using a T A fl [) I separation machine for 1 minute.

Example 3 Ultra-fine glass fiber with trade name Evans 504 (0,3
9-0, 53 pmφ) (manufactured by Evans) 2g and chopped strand acrylic fiber AIO+! ,
The same procedure as in Example was carried out except that 25.8 g of 5×5 (manufactured by Kakasei Kogyo Co., Ltd.) was used.

Comparative Example 3-1 0.5 g of Evans 504 as ultra-fine glass delicate, and Land Acrylic JA [Aio+-1,
The same procedure as in Example 1 was carried out except that 27.9 g of 5×5 was used.

Example 4 As an ultrafine glass fiber, the trade name Evans 510 (2,5~
The same procedure as Example J was carried out except that 18 g of chopped strand 1 x acrylic fiber Al0I-], sx 5 (manufactured by Kakasei Kogyo Co., Ltd.) were used.

Comparative Example 4-1 1.9 g of Evans 510 as ultrafine glass fiber and Chop Toss 1 to Rand acrylic fiber Al0I-1,5
The same procedure as in Example]- was carried out except that 1.5 g of ×5 was used.

Margin below = 8- Quantity mouth UG3-44915 (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 newly invented method θ- is used, the pressure loss is low, and the 0.3 voice diameter DOP smoke collection rate, which represents the dust collection rate, is also the standard 9.
9.97% or more, and the tensile strength of the product is 1.
We can manufacture ultra-high-performance air filter paper with a weight of 15 kg/15 nwn or more. On the other hand, as shown in Comparative Example 1-1, when paper is made using sulfuric acid acid water using chopped 1-land glass fiber, the smoke collection rate (0, Jan diameter D01) is extremely low and falls below the standard value. became. Also,
As shown in Comparative Example 1-2, even if chopped toss 1-land acrylic fibers were used to make paper using sulfuric acid acid water, the smoke collection rate of 0.3 voice diameter DOP was the same as Comparative Example 1-1. It decreased to below the standard value. Also, Comparative Example 1-3
As shown in Figure 2, even if chopped strand acrylic fibers are used to make neutral paper using water, if the addition rate of the fibrous vinylon binder falls below the appropriate amount range, SEE! However, when the tensile strength of Sea 1- becomes extremely low, and on the other hand, as shown in Comparative Example 1-4, the tensile strength of Sea 1- becomes high, but the filter performance deteriorates due to high pressure loss and low trapping. The collection rate becomes extremely poor. Furthermore, as shown in Comparative Example 1-5, 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 amount of binder is doubled and the tensile strength is similar to that of the fibers. Although the strength increased, the OP smoke collection rate decreased with a diameter of 0.3ρ.

Next, Table 2 shows the manufacturing results of medium/high performance air filter paper, which has a 0.3 chamber diameter Dot3 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 but also for
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 ultrafine glass fibers exceeds 5 parts, a large number of pinholes occur, resulting in an extremely low smoke collection rate of 0.3P diameter DO. Furthermore, as shown in Comparative Example 4-1, ultrafine glass fibers
If it is more than 0 parts + r or 1 part, the blending effect of the chopped toss 1-land acrylic fiber becomes less and the tensile strength to Sea 1 becomes lower.

As shown in 1-1 above, the ultra-fine glass fiber H with an average fiber diameter of 0.3 to 4p (and chopped 1 strand acrylic fiber) was
By using λ material and internally adding fibrous vinylon binder, it is possible to make paper with water neutrality, and the yield of ultrafine glass fiber is good, so it is possible to make various grades from medium performance to ultra high performance. It became possible to manufacture air filter paper.

Special a′ (Applicant: Sanyo Kokusaku Valve Co., Ltd. Procedural Amendment June 311, 1988

Claims (1)

[Claims] 1. Ultrafine glass fibers with an average fiber diameter of 0.3 to 4 μm and chopped strand acrylic fibers are the main raw materials, and a fibrous vinylon binder is added internally to the fibers in an amount of 1 to 10% to form a neutral wet process. 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 acrylic fibers is 5:95 to 90:10.