JPH0143618B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a base material for architectural laminate materials. The purpose is to create a base material for laminated materials that has excellent physical properties, especially high interlaminar strength, so that it can be peeled cleanly from the adhesion surface to the floor when peeled off during repositioning, and has so-called excellent peel-up properties. It is about providing. In recent years, asbestos paper is used as a base material, and a polyvinyl chloride paste is applied onto it and gelled, an appropriate pattern is printed on the surface, and then a transparent polyvinyl chloride paste is applied on top of that and heated and foamed. It has come to be widely used as a long PVC flooring material, and its fashionability and cushioning properties have attracted attention and been well received. This base asbestos paper is heat resistant,
It has excellent dimensional stability and durability, and is currently used as a suitable base material for the above-mentioned flooring materials, accounting for the majority of them. However, about 10 years have passed since the above-mentioned PVC long flooring material was introduced to Japan and became popular.
It has been pointed out that asbestos paper is unsuitable for repainting, as well as hygienic problems during its production and product handling. In other words, after pasting PVC long flooring material based on asbestos paper on the floor with adhesive, if you try to peel it off in order to replace it with a new flooring material after 5 to 10 years, the asbestos paper's interlayer strength Because the asbestos paper is small, it mainly peels between the layers of asbestos paper, leaving the lower layer of the asbestos layer with unevenness on the floor surface, which has poor peel-up properties, and the unevenness must be removed in order to apply a new flooring material. However, it requires a lot of effort and work efficiency becomes very poor. Various means are currently being proposed and implemented to improve this peel-up property, but these can be broadly classified into the following three types. The first method is to provide a floor base material with at least a two-layer structure, with a layer with strong interlaminar strength as an upper layer and a layer with weak interlaminar strength as a lower layer, and to attempt to peel uniformly at the boundary between the two layers. However, in order to create a two-layer structure, it is necessary to bond them together with an adhesive or to form them together, and the former requires an additional process of bonding, resulting in poor workability and high cost, while the latter requires the process of bonding. Because the gap between the two layers is very weak, if shearing force is applied to the floor after the flooring has been installed, it will partially peel off at the interface, creating unevenness on the top surface of the flooring. Furthermore, usually
Since adhesive is not applied to the entire surface of the floor when it is installed, some parts remain on the floor surface when it is removed, while others do not, resulting in unevenness when it is reapplied. The second method is to apply a release agent or the like to the back surface of the base material. This method also requires a coating process, which results in poor workability and high costs.Furthermore, this method imparts peel-up properties by applying a release agent to the base material to weaken the adhesion between the floor surface and the base material. Unless there are restrictions on the condition of the floor surface or the adhesive used, the adhesion to the floor surface is weak, and if shearing force is applied to the top surface of the flooring material, the area between the floor surface and the base material will be damaged. This has the drawback that it tends to peel off and cause unevenness on the upper surface of the flooring material. The third method is to use as a base material a polyvinyl chloride sheet prepared by impregnating a glass paper with excellent dimensional stability with vinyl chloride paste or emulsion. Products manufactured by this method have good peel-up properties, but the biggest problem is that before glass paper is used as a base material, polyvinyl chloride sol, polyvinyl chloride emulsion, or other synthetic resins, etc. This means that processing must be performed, which inevitably leads to drawbacks such as a complicated manufacturing method and high cost. Keeping in mind the above points and considering that asbestos is unfavorable for human health, the present inventor has developed a material that does not use asbestos, does not require secondary processing, and has excellent physical properties as a base material for laminated materials. As a result of various studies in order to obtain a material with excellent peel-up properties, they succeeded in obtaining an extremely excellent base material for laminated materials by using an agglomerated binder in a mixed fiber of glass fiber and pulp, etc. . That is, it is a base material for PVC long flooring material, which is made of 100 parts by weight of mixed fibers containing glass fiber and pulp, anionic polymer emulsion, water-soluble cationic polymer, polyvalent metal salts, or inorganic binder. A base material for laminated materials with excellent peel-up properties, characterized in that a dispersion slurry consisting of 40 to 250 parts by weight of an agglomerated binder with a particle size of about 10 μ or more obtained by adding the resulting slurry is made into paper using a wet paper-making method and dried. This led to the invention of . The greatest feature of the present invention is the addition of a large amount of agglomerated binder, which is uniformly dispersed between each fiber to produce a binder effect, improving the interlaminar strength of the base paper base material, and thus improving peel-up. This means that the quality will be significantly better. The agglomerated binder in the present invention is obtained by adding a water-soluble cationic polymer, polyvalent metal salts, or an inorganic binder to an anionic polymer emulsion such as acrylic resin or rubber latex while stirring, and has a particle size of approximately 10 μm or more. It is an aggregate of The particle size of this agglomerated binder is much larger than that of liquid binder, and the minimum particle size is approximately
Since it is 10μ or more, when a large amount of this cohesive binder is used, in addition to the above-mentioned excellent peel-up properties, it acts as a filler and has a closing effect by filling the voids between each fiber, making it difficult to paste vinyl chloride. This prevents sol leakage and uneven penetration, and also improves the smoothness of the base material surface, improving the smoothness of the final finished flooring material. Further, even if this agglomerated binder is used in large amounts, the base paper base material does not become rigid, and has excellent flexibility, making it easy to apply at bent portions. As described above, by using a large amount of agglomerated binder, the present invention increases the interlayer strength due to the inherent binder effect, significantly improves peel-up properties, and improves the packing effect, smoothness, flexibility, etc. It has become a thing of the past. The amount of the agglomerated binder added is required to be 40 to 250 parts by weight per 100 parts by weight of the mixed fibers. The reason for this is that if the amount of the cohesive binder is less than 40 parts by weight, it will be difficult to achieve the above-mentioned properties by adding a large amount, which is a characteristic of the cohesive binder, and the purpose of the present invention will not be achieved. If the temperature exceeds the above, the above-mentioned performances will improve, but conversely, the heat resistance required for processing the flooring material as a base material for PVC long flooring material will become inferior. The mixed fiber in the present invention contains glass fiber and pulp as essential components, and other synthetic fibers are mixed as appropriate. The base material of the present invention is obtained by dispersing 40 to 250 parts by weight of the agglomerated binder in water to prepare a slurry based on 100 parts by weight of this mixed fiber, making a paper using a normal wet paper making method, and drying the slurry. . Preferable results can be obtained by adjusting the mixing ratio of glass fiber in the base material of the present invention to be in the range of 10 to 50 parts by weight per 100 parts by weight of the total weight of the base material after drying. When the glass fiber mixing ratio is less than 10 parts by weight, its characteristic dimensional stability decreases, while when it exceeds 50 parts by weight, the dimensional stability improves, but on the other hand, it is not necessary as a base material for PVC long flooring. This results in poor plugging effect and leakage of polyvinyl chloride paste. Further, in the base material of the present invention, the mixing ratio of pulp is at least 100 parts by weight after drying the base material.
It is desirable that the content is 20 parts by weight or more. The reason for this is that if the mixing ratio of the pulp is less than 20 parts by weight, the plugging effect will be poor, and the yield of the agglomerated binder will further decrease, and the effect of the agglomerated binder will not be fully exhibited. In other words, although it varies depending on the particle size of the agglomerated binder, in order to improve the yield of agglomerated binder with a particle size of several tens of microns, it is necessary to physically entangle the agglomerated binder with fibrillated fibers like a bulb. There is a need to match. In other words, in the present invention, since a large amount of agglomerated binder is used, such a pulp-like fibrillated fiber material is essential. The fibrillated fiber materials mentioned above are NBKP,
These are natural pulps such as LBKP, or synthetic pulps such as thermoplastic polymers such as polyethylene and polypropylene, and heat-resistant polymers such as aromatic polyamides and aromatic polyesters. However, when using synthetic pulp of thermoplastic polymers such as polyethylene and polypropylene, it cannot be used in large quantities because it has the disadvantage of poor heat resistance, and the maximum amount is limited to 30% of the total weight. In this way, the three components of glass fiber, pulp, and agglomerated binder each exhibit their own unique effects, and only when they act synergistically with each other can a base material for laminated materials with excellent physical properties like the one of the present invention be created. You can get it. If more than 20 parts by weight of pulp is mixed in the above 100 parts by weight, the excess amount may be replaced with synthetic fibers such as polyester, nylon, vinylon, etc. For example, if 30 parts by weight of pulp is used,
This means that it may be used as is, or the pulp content may be replaced with the above synthetic fiber in an amount of 10 parts by weight or less. A more preferable base material can be obtained if the base material of the present invention is subjected to pressure treatment in a wet paper state during the manufacturing process, that is, before paper making by a wet paper making method and drying. In other words, this pressure treatment increases the adhesion area of the cohesive binder and improves various physical properties.In particular, the interlaminar strength becomes extremely high, and the peel-up properties and smoothness become even better. Furthermore, if the base material of the present invention is impregnated with a binder liquid in the wet paper state before drying as described above, it becomes possible to obtain a material with even better strength. Examples of the binder liquid include a polyvinyl alcohol aqueous solution, a vinyl acetate emulsion liquid, and an acrylic emulsion liquid. In the base material of the present invention, smoothness and other physical properties can be further improved by further applying pressure to a material that has been wet paper-made and simply dried, or a material that has been subjected to pressure or impregnation treatment as described above and dried. It is also possible to do so. The main feature of the present invention is that it uses a large amount of an agglomerated binder, which can be added in large amounts, which is considered impossible with ordinary binders. By the way, the present inventor has attempted to increase the interlaminar strength of the base material by adding a large amount of synthetic resin powder instead of the agglomerated binder, albeit experimentally. However, in this case, the strength of the wet paper is very weak using the wet papermaking method, making it difficult to make into base paper, and the surface of the finished base paper is uneven, making it impossible to use it as a base material for PVC long flooring. It turned out that something was true. As a result, they learned that it is essential to use an agglomerated binder in order to be able to add a large amount and increase interlaminar strength while obtaining surface smoothness. However, if the above-mentioned synthetic resin powder is used in a proportion of 20 parts by weight or less per 100 parts by weight of the total weight of the base material of the present invention, it can be used to form a base paper and there is no problem in using it. In addition, as a feature of using a cohesive binder, if a hydrophobic cohesive binder is used,
It can also be mentioned that the water resistance of the obtained base paper is improved, and in particular, the dimensional stability against water is very good.
Furthermore, since a large amount of agglomerated binder is used, it is possible to prevent the irritation to the skin caused by the tingling characteristic of glass fibers. As explained in detail above, the present invention is a base material produced by a wet papermaking method that contains glass fiber, pulp, and an agglomerated binder as essential components.By adding a large amount of an agglomerated binder, the interlaminar strength is extremely high. As a result, it has excellent peel-up properties and can be peeled off cleanly from the floor surface when replacing PVC flooring, leaving no unevenness on the floor surface. Furthermore, the substrate of the present invention has excellent physical properties such as packing effect, smoothness, dimensional stability, heat resistance, and strength, making it comparable to conventional asbestos paper. Furthermore, since asbestos is not used in the present invention, it goes without saying that there are no human health problems during manufacturing and handling. Example 1 Glass fibers (diameter...
A dispersion slurry of mixed fibers: 25 parts by weight of natural pulp (NBKP) beaten to SR12° (9 μ, length: 25 mm), and 25 parts by weight of vinylon fiber (thickness: 1 denier, length: 5 mm) 150 parts by weight of the following agglomerated binder in terms of solid content was added and dispersed. Agglomerated binder: 10% by weight acrylic resin emulsion is stirred at 200 rpm while 5% by weight sulfuric acid band solution is gradually added to form particles with a particle size of approximately 10 to 50μ.
aggregates were prepared. The mixed and dispersed slurry thus obtained was made into a paper using a Fourdrinier paper machine, and then 100 parts by weight of a polyvinyl alcohol aqueous solution and 10 parts by weight of a urea resin were mixed by on-machine impregnation. The mixed paper was impregnated at an impregnation rate of 15% and dried to obtain a base sheet with a thickness of about 0.5 mm. Example 2 Glass fibers (diameter...
9μ, length...13mm) 20 parts by weight, natural pulp beaten to SR12° (NBKP) 40 parts by weight, vinylon fiber (thickness...1 denier, length...5mm) 20 parts by weight, and polyvinyl alcohol swollen in water. To a mixed and dispersed slurry consisting of 20 parts by weight of powder, 100 parts by weight of the following agglomerated binder was added in terms of solid content. Agglomerated binder: A 5% by weight sulfuric acid binder solution was gradually added to a 10% by weight styrene-butadiene copolymer latex solution while stirring at 2000 rpm to prepare aggregates with a particle size of about 10 to 50μ. This dispersion slurry was made into paper in the same manner as in Example 1, impregnated and dried to obtain a base sheet with a thickness of about 0.5 mm. Example 3 Glass fibers (diameter...
A dispersion slurry of mixed fibers of 40 parts by weight of natural pulp (LBKP) beaten to SR12°, and 20 parts by weight of polyester fibers (thickness: 0.7 denier, length: 6 mm). , 100 parts by weight of the same agglomerated binder as in Example 1 was added in terms of solid content,
Paper is made using a Fourdrinier paper machine, and the weight of this wet paper is 40kg/
After being pressure treated at a pressure of ^cm2 , it is dried to a thickness of approximately 0.5mm.
A base sheet was obtained. Example 4 Glass fibers (diameter...
30 parts by weight of natural pulp beaten to SR12° (LBKP), 30 parts by weight of vinylon fiber (thickness: 1 denier, length: 5 mm), and polyvinyl alcohol swollen in water. 45 parts by weight of the same agglomerated binder as in Example 2 was added and dispersed in a dispersion-mixed slurry of 10 parts by weight of powder, and the paper was made using a circular paper machine. After pressurizing in the same manner as in Example 3, it was dried. A base sheet with a thickness of about 0.5 mm was obtained. Comparative example: Chrysotile asbestos (class 6 according to the Canadian Quebec standard grading) is beaten with a beater and the bound fibers are completely disintegrated, then styrene and
Add 18% butadiene copolymer latex, adjust the pH to 7 with sulfuric acid band, and make paper using a Fourdrinier paper machine.
After drying, asbestos paper with a thickness of about 0.5 mm was obtained. Various data were measured for the above Examples 1 to 4 and Comparative Examples, and the results are summarized in the table below.

【table】

【table】

[Table] Measurement method (i) Thickness and density according to JIS P-8118, basis weight according to JIS P
-8124, respectively. (ii) Room temperature tensile strength is only in the longitudinal direction according to JIS P-8113. (iii) Heat-resistant tensile strength is determined by leaving the product in an atmosphere at 210°C for 3 minutes, and then in the same atmosphere in the longitudinal direction according to JIS P-8113. (iv) Elongation during each tensile strength measurement conforms to JIS P-8132. (v) Tear strength is only in the lateral direction according to JIS P-8116. (vi) The interlayer strength of the base paper conforms to JIS P-8139. (vii) Peel-up properties were compared as follows. Each base material is coated with a polyvinyl chloride paste sol and heated and foamed to create a long PVC flooring material, which is then cut to a width of 30mm and glued with ethylene vinyl acetate adhesive to create a regular plywood board (width 60mm). The measurement sample was prepared by adhering a portion of the adhesive to the surface of the adhesive and air-drying it for 24 hours. The above sample was peeled off from the non-adhered portion by pulling at a speed of 100 mm/min at a peeling angle of 90 degrees. Observe the peeling state at this time with the naked eye. If the PVC layer and the base material peel off and the base material remains on the plywood, or if the base material layer peels off and the lower layer of the base material remains on the plywood, it is judged as "defective". A state in which the PVC layer and the base material did not peel off and the base material did not remain on the plywood and either the adhesive remained or nothing remained was rated as "excellent". (viii) Heat shrinkage resistance of a sample with an area of 30cm x 30cm at 210℃
for 3 minutes, and the shrinkage rate only in the longitudinal direction was measured. (ix) For expansion and contraction in water, a sample of the same size as (viii) is
It was immersed in water for a week and its shrinkage rate only in the longitudinal direction was measured. As can be seen from Tables (1), (2), and (3) above, the base material for laminated materials of the present invention has physical properties equivalent to or better than that of commonly used asbestos paper, especially in terms of interlaminar strength. As a result, it has extremely excellent peel-up properties.

Claims (1)

[Claims] 1. A base material for PVC long flooring, which comprises 100 parts by weight of mixed fibers containing glass fiber and pulp, an anionic polymer emulsion, a water-soluble cationic polymer, a polyvalent metal salt, Or, a dispersion slurry consisting of 40 to 250 parts by weight of an agglomerated binder with a particle size of about 10μ or more obtained by adding an inorganic binder etc. is made into paper using a wet paper making method and dried. Base material for laminated materials. 2 The mixing ratio of glass fibers is 100% of the total weight after drying.
The base material for a laminate material having excellent peel-up properties as claimed in claim 1, wherein the amount is in the range of 10 to 50 parts by weight. 3. The base material for a laminated material having excellent peel-up properties as claimed in claim 1 or 2, wherein the mixing ratio of pulp is 20 parts by weight or more per 100 parts by weight of the total weight after drying. 4 Claim 1: Pressure treated before drying
A base material for a laminate having excellent peel-up properties as described in item 1, 2, or 3. 5. A base material for a laminate having excellent peel-up properties as set forth in claim 1, 2, 3, or 4, which is impregnated with a binder liquid before drying. 6 Claim 1: Pressure treated after drying
A base material for a laminate having excellent peel-up properties as described in item 1, 2, 3, 4, or 5.