JPS62110999A - Production of glass fiber paper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a method for making glass fiber paper using a conventional wet paper making machine. The present invention relates to an improvement in a papermaking method when the alkalinity is 8 or more.

(Prior art) Glass fibers, which are originally inorganic fibers, have poor dispersibility in water.There is a method for temporarily dispersing glass fibers by adding an appropriate acid to papermaking process water to reduce the... to about 2 or less. However, in order to improve the dispersibility, for example, aU<, natural or synthetic polymers, Alternatively, a method using a surfactant has been discovered. However, in all of these conventional methods, the process water needs to be around acidic or neutral, and if it is alkaline, especially if it is 8 or more, it is not effective in dispersing the glass fibers.

Therefore, if you dare to make paper in an alkaline environment, in order to prevent the glass fibers from being stirred in alkaline water for a long time, for example, the interior of the papermaking chest should be kept around acidic or neutral, and only the white water used in the papermaking process should be alkaline. It is necessary to use a method that allows the water to be extracted within a short time after coming into contact with alkaline water, but in this case it is impossible to return the white water to the chest, and it is necessary to dispose of alkaline white water that corresponds to the amount of water flowing from the chest. However, it is almost impractical in terms of chemical costs and wastewater treatment costs. On the other hand, in recent years, the characteristics of glass fiber paper that are not found in other types of fibers, such as chemical resistance, weather resistance, heat resistance, and dimensional stability, have attracted attention, and its uses have expanded, and the strength of glass fiber paper, especially There is a demand for improved strength when wet, and various improvements have been made. Among them, the binder for glass fibers having a silyl group as disclosed in Japanese Patent Application No. 59-87438 is extremely effective in improving wet strength, and this effect is particularly exhibited by making paper by making the process water alkaline. However, with the above-mentioned conventional techniques, it is extremely difficult to make paper while preventing agglomeration of glass fibers, and papermaking methods that maintain good dispersion of glass fibers in a single width even in alkaline water are severely hampered.

(Structure of the present invention) Therefore, the shortcomings of the prior art are improved, the dispersion of glass fibers is maintained in a good state even in alkaline water, and the characteristics of the binder for glass fibers having a silyl group are developed, As a result of extensive research into making highly strong glass fiber paper easier to make, the present invention was developed.
1; CH3 or 02H5 R2; aliphatic hydrocarbon R3 having 4 to 24 carbon atoms; (C2H40)nH R4; (C2H4(J), TIH (however, n-1-m
is an integer from 1 to 20) It is characterized by the presence of the surfactant in some form in the slurry containing the binder for glass fibers having a group of It is also possible to obtain a highly strong glass fiber paper in which the glass fibers maintain good dispersion without agglomeration, and the adhesive strength of the binder having a silyl group to the glass N1 fibers is not impaired. It is something.

The binder having a silyl group used in the present invention is a polyvinyl alcohol binder having a 7-lyl group as disclosed in Japanese Patent Application No. 87438/1983. That is, the polyvinyl alcohol binder fiber contains 0.
A reactive substituent containing 1 to 10 moles of 7lyl group, preferably 0.2 to 3 moles, and the silyl group is an alkone group, an acyloxylyl group, or a silanol group which is a hydrolyzate thereof, or a salt thereof. It is preferable to have the following.

In the present invention, the silyl group content of polyvinyl alcohol binder fibers refers to the number of silyl groups relative to the total number of silyl groups present in the polymer molecules constituting the binder fibers and hydroxyl groups generated from vinyl acetate. It refers to the proportion of a number. Further, the fineness is preferably 10 deniers or less, more preferably 0.2 to 2 deniers. The content of the above-mentioned polyvinyl alcohol binder fibers having silyl groups in the paper stock is not particularly limited, but is preferably 5 or more in order to impart sufficient strength to the resulting glass fiber paper.

Due to its structure, the surfactant of the present invention represented by the above general formula has a positive gradient portion adsorbed to glass fibers even in alkaline water, coating the surface of the glass fJIm, and causing the glass fibers to directly interact with each other. It is understood that the binder has both the property of preventing cohesion upon contact and the property of not inhibiting the effect of the binder adhering to the glass fibers and exerting the strength of the glass fiber paper, but both of these properties, that is, the former is cationic. The latter requires an appropriate balance of hydrophilicity after adsorption to glass fibers. Therefore, the conditions for R1-R4 and X in the general formula are determined by the strength of cationicity related to X and the hydrophilicity related to R1-R4. According to the present inventors, there is no particular restriction on X, but in the case of halogens such as CI and Br, the adsorption to glass fibers is strong, and if the hydrophilicity of R1-R4 is small, the adhesion of the binder to glass fibers is (CH3)
2PO3, C2H5SO4, etc. are preferable. R1 is preferably CH3 or C2H5, and R2 preferably has 8 to 18 carbon atoms in order to obtain hydrophilicity, and unsaturated hydrocarbons are particularly preferred. Number of moles added to R3 and R4 n+m
is preferably from 2 to 7. If it is 20 or more, the hydrophilicity becomes too strong and the adsorption to glass fibers is weakened, resulting in a decrease in the dispersion ability of glass fibers.0 The effect of improving the papermaking properties of the glass fibers used is something that cannot be achieved with conventional surfactants.

Preferred specific examples of the surfactant of the present invention represented by the above general formula include polyoxyethylene 2 mol A layyl methyl ammonium methyl phosphate, polyoxy ethylene 3 mol A
morcetyldimethylammonium ethyl sulfate,
Examples include polyoxyethylene 3 moles stearylmethylammonium chloride, polyoxyethylene 2 moles laurylmethylammonium phosphate, and the like.

The rate of addition of the surfactant of the present invention to the slurry or the rate of attachment to the glass fibers is not particularly limited, and depends on the papermaking equipment used, the papermaking speed, that is, the residence time during the paper stock process, or the rate of attachment to the glass fibers. ? It is determined appropriately depending on the papermaking conditions such as the rolling method, but it is usually 0.05 to 1 for glass fiber.
．． It may be 0% by weight. In addition to glass fibers and binders, the paper stock may include various commonly used paper stocks, such as synthetic fibers such as polyvinyl alcohol, polyester, or polyethylene, natural or synthetic pulp, and natural or synthetic polymers. Additives etc. may be mixed.

(Unfortunately) Next, the present invention will be explained in more detail by "Practicing the present invention."

Example-1 90-weight waxed glass fiber of 9 μm thickness and 6IIIJ of Maki Wainaga and +11. degree 1.0 denier, fiber length 3u, silyl group 0
．． After adding 10 layers of polyvinyl alcohol binder fibers having 6 moles to the process water prepared in river 12, add polio to the glass fibers and add 2 moles of diethylene oleyl ammonium methyl phosphate to the glass fibers. Stir thoroughly to disperse, make paper using the usual method, and stitch 60 f /
m” glass fiber paper was obtained.

Example-2 Implementation (Glass fibers shown in +lJ-1 were soaked in a bath solution of 2 moles of polyoxyethylene lauryl methyl ammonium phosphate, and the sanding rate was 0.1 with respect to the glass fibers.
The liquid was squeezed to an excellent fl content and air-dried to make glass fiber paper according to Example-1.

In the same manner as in Comparative Example 1, a glass fiber paper was made by adding 0.3% of the surfactant shown below to the glass fiber.

■ Polyethylene glycol (molecules 1i400) lauryl ether ■ Dioctylsulfosuccinate Na salt ■ Stearyltrimethylammonium chloride Tenacity (breaking length) of glass fiber paper obtained in Examples and Comparisons 1+11 described above, and glass l&if
The dispersion state of is shown in Ki-1.

Margin table below 1 The tearing length in Table 1 is J in the machine direction of glass fiber paper.
Proceed to IS P-8113 and measure.

(Effects of the present invention)

Claims (1)

[Claims] When papermaking process water with a pH of 8 or more is used to make papermaking material containing glass fibers and a binder for glass fibers having a silyl group, a cationic interface represented by the following general formula [A] is used. A method for producing glass fiber paper, characterized in that paper is made by attaching an activator to the glass fibers in advance or adding it to papermaking process water. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ [In the formula, R_1; CH_3 or C_2H_5 R_2; Aliphatic hydrocarbon having 4 to 24 carbon atoms R_3; (C_2H_4O)_nH R_4; (C_2H_4O)_mH (however, n+m is 1
~20 integer) X; acid component of alkylating agent]