JPH0565634B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to glass fiber paper, and particularly to glass fiber paper with excellent properties such as flexibility. [Prior art] Glass fiber paper is nonflammable or flame retardant, and unlike wood pulp fiber paper, synthetic fiber paper, etc., it does not emit harmful gas when burned or carbonize and turn black. It is widely used as a variety of interior materials, exterior materials, skin materials, etc. Therefore, most conventional glass is made by cutting glass fibers into short lengths and wet-forming them, and using an appropriate binder to bond the glass fibers together,
It shows strength. In addition, as a method for producing mineral fiberboard made of rock wool, etc., a method has been proposed in which rock wool, etc. is suspended in water, aluminum hydroxide is added to this slurry, and the paper is made (Tokuko Sho). 51−38349). [Problems to be Solved by the Invention] In the above method for producing glass fiber paper, synthetic resins such as vinyl chloride have been used as binders for a long time. Even if it is made of flame-retardant resin, harmful gases will be generated when it comes into contact with high-temperature flames. In addition, mineral fiberboard obtained by adding aluminum hydroxide during papermaking of mineral fiber (method described in Japanese Patent Publication No. 51-38349) is both hard and brittle, making it difficult to use as glass fiber paper. is not suitable. [Means for Solving the Problems] In order to solve the above problems, the present invention uses alumina sol as a binder to bind glass fibers of a specific length or diameter, and the average diameter is 20 to 50 parts by weight of glass fibers with a length of 4 to 13 μm and 3 to 25 mm, 60 to 30 parts by weight of glass fibers with an average diameter of 0.4 to 1.5 μm, and alumina sol.
A glass fiber paper characterized by containing 10 to 40 parts by weight in terms of Al ₂ O ₃ . The present invention will be explained in more detail below. The glass fibers constituting the glass fiber paper of the present invention are of two types: large diameter ones with an average diameter of 4 to 13 μm, and thinner ones with an average diameter of 0.4 to 1.5 μm. Those with a large diameter having an average diameter of 4 to 13 μm and a length of 3 to 25 mm are used. As the large-diameter glass fibers, it is preferable to use chopped strands obtained by cutting long glass fibers into lengths within the above-mentioned range. In addition, if the average diameter of the large diameter glass fibers is smaller than 4 μm, it becomes extremely difficult to manufacture the long glass fibers that are the material for the tip strands, resulting in increased costs.
If the diameter is larger than 13 μm, the filament is likely to break, resulting in increased irritation to the skin. Furthermore, if the length of the large-diameter glass fiber is shorter than 3 mm, the strength of the glass fiber paper will be reduced. On the other hand, if the length is longer than 25 mm, it becomes difficult to manufacture glass fiber paper. That is, as described below, the glass fiber paper of the present invention is generally produced by a papermaking method, but if the fiber length is greater than 25 mm, it becomes difficult to uniformly disperse it in the papermaking water. This makes it difficult to obtain highly homogeneous glass fiber paper in which the fibers are evenly dispersed. Furthermore, when the content of the large-diameter glass fibers is less than 20 parts by weight, the bending resistance of the glass fiber paper decreases and it becomes brittle. Moreover, if it exceeds 50 parts by weight, the air permeability of the glass fiber paper will decrease. Fine glass fibers with an average diameter of 0.4 to 1.5 μm are
It is contained in a proportion of 60 to 30 parts by weight. If the diameter of the fine glass fibers is smaller than 0.4 μm, the manufacturing cost is high, leading to an increase in the cost of the glass fiber paper. Furthermore, if the average diameter of the small diameter glass fibers exceeds 1.5 μm, the air permeability of the glass fiber paper will decrease. Furthermore, if the content of small-diameter glass fibers exceeds 60 parts by weight, the bending resistance of the glass fiber paper decreases and becomes brittle, while if it is less than 30 parts by weight, the glass fiber paper becomes brittle. Air permeability begins to decrease. As the small-diameter glass fibers, it is preferable to use so-called short glass fibers produced by a centrifugal force method, a flame method, or the like. Note that the method for producing this short glass fiber is not limited in any way. The glass compositions of the above-mentioned large diameter and small diameter glass fibers are not limited in any way in the present invention, and are appropriately selected in consideration of the intended use of the glass fiber paper. The content of alumina sol in the glass fiber paper of the present invention is 10 to 40 parts by weight in terms of alumina. If the alumina sol content is less than 10 parts by weight, the bonding force between the glass fibers will decrease, and the strength of the glass fiber paper will decrease. while 40
If the amount is more than 1 part by weight, the glass fibers will be too strongly bonded to each other, making the glass fiber paper rigid and reducing its bending resistance. Note that alumina sol is, as is well known, several micrometers to
It is an alumina hydrate (boehmite type) with a colloid size of several hundred μm, and is a liquid pair in which colloid particles are dispersed in water using anions in the water as a stabilizer. This alumina sol is therefore dispersed in water, which is a dispersion medium, but in the glass fiber paper of the present invention, water, which is a dispersion medium, and all the OH groups and structural water that constitute boehmite are removed as H ₂ O. 10 parts by weight converted to alumina (Al ₂ O ₃ )
It contains ~40 parts by weight. As described below, the glass fiber paper of the present invention usually has
It is obtained by drying a glass fiber paper product to which an alumina sol solution has been adhered, and in this drying process, most of the water as a dispersion medium has evaporated. Furthermore, most of the so-called structured water that is strongly bound to the boehmite particles remains, and it is therefore presumed that the boehmite exists as hydrated aluminum oxide. An example of a manufacturing method for the glass fiber paper of the present invention will be described below. To produce the glass fiber paper of the present invention, large diameter glass fibers selected to have an average diameter and length within the above range and small diameter glass fibers selected to have a diameter within the above range are immersed in water. disperse. In one embodiment of the manufacturing method, the glass fibers dispersed in water are made into a paper, and the paper product is immersed in an alumina sol solution to adhere the alumina sol to the glass fibers. In another embodiment of the manufacturing method, an alumina sol solution is applied to the paper-formed glass fibers by appropriate spraying means such as spraying. In yet another embodiment of the manufacturing method, glass fibers are dispersed in water containing alumina sol when performing the above-mentioned papermaking. (Alternatively, after dispersing the glass fibers in water, the alumina sol solution is added to the water.) Then, by forming the glass fibers into paper, a glass fiber paper product to which the alumina sol is attached is obtained. Glass fiber paper is obtained by drying the paper product thus obtained at a temperature of 100 to 250°C, preferably 120 to 200°C. [Function] The glass fiber paper of the present invention includes large glass fibers of a predetermined length and a predetermined diameter and thin glass fibers of a predetermined diameter, and these glass fibers are bonded with an alumina sol. be. Since the large-diameter glass fibers and the small-diameter glass fibers are blended in an appropriate ratio, the glass fiber paper has excellent flexibility. Furthermore, since it contains fine-diameter glass fibers, the diffused reflection properties are increased, thereby suppressing light transmission and improving concealment. The alumina sol used as a binder has extremely high binding strength, and therefore the strength of the glass fiber paper is also high. Moreover, since the content ratio is appropriate, the glass fiber paper does not become excessively rigid and has excellent flexibility. [Examples] Examples will be described below, but the present invention is not limited to the following examples unless it departs from the gist thereof. Examples 1 and 2 Glass fibers with an average diameter of 6 μm and a length of 6 mm
50 parts by weight of glass fibers (short glass fibers) with an average diameter of 0.8 μm were dispersed in water, and the fabric weight was 60.
g/m ² (Example 1) and 100 g/m ² (Example 2). This paper product was immersed in a solution of Nissan Chemical's Alumina Sol 200 (trade name) to adhere the alumina sol, and then dried at 160°C for 5 minutes.
A glass fiber paper was obtained. The glass fiber paper thus obtained consists of glass fibers with an average diameter of 6 μm and a length of 6 mm, and an average diameter of 0.8 μm.
glass fiber and alumina sol in the proportions shown in Table 1. The properties of this glass fiber paper were measured and were as shown in Table 1. Comparative Example 1 Glass fibers with an average diameter of 9 μm and an average length of 13 mm and softwood pulp with an average length of 2 mm were uniformly suspended in water, aluminum hydroxide was added to the water, and the mixture was stirred. Dry for 30 minutes at °C. Table 1 also shows the measurement results of the properties of the obtained glass fiber paper. From Table 1, it is recognized that the glass fiber paper according to the example is nonflammable and has an appropriate degree of air permeability. (Incidentally, shoji paper is required to have an air permeability of 8 seconds or more to prevent stains from sticking to it, and all of the examples in this example meet this required level.) Being rich is allowed.

[Table] [Effects] As detailed above, the glass fiber paper of the present invention has the following effects:
It is made by combining large-diameter glass fibers with a predetermined diameter and length with thin-diameter glass fibers with a predetermined diameter using alumina sol, and by appropriately selecting the proportions of these fibers, making it extremely flexible. It has excellent air permeability. In addition, since it contains small-diameter glass fibers, light transmission is suppressed due to diffuse reflection, resulting in high hiding performance. Furthermore, since the fibers are bonded together sufficiently by the alumina sol, the strength of the glass fiber paper is also high. Furthermore, it is nonflammable since it contains virtually no organic matter.

Claims (1)

[Claims] 1 20 to 50 parts by weight of glass fibers with an average diameter of 4 to 13 μm and a length of 3 to 25 mm, an average diameter of 0.4 to 1.5 μm
A glass fiber paper comprising 60 to 30 parts by weight of glass fibers and 10 to 40 parts by weight of alumina sol in terms of Al ₂ O ₃ .