JPH0147506B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adhesive composition for bonding carpet fabric and backsheet for the production of carpet tiles. The purpose of this product is to create an excellent carpet tile manufacturing adhesive that can be bonded directly to the backsheet without lining the carpet fabric in advance, and that is less likely to cause fraying or peeling of the carpet fabric around the periphery of the carpet tile. To provide a composition. Carpet tiles with a relatively small square or diamond shape, or a complex shape with appropriate thickness and weight can be laid by simply arranging them on the floor without any gaps, making installation easier and easier. Recently, it has become popular due to its economical nature as it allows only the damaged parts to be replaced easily. In addition to providing cushioning properties, carpet tiles also require a back sheet with appropriate thickness and weight so that they will not easily float up and leave the floor even if stepped on or rubbed.
Conventionally, the backing agent, which is made of asphalt, vinyl chloride resin, polyethylene resin, atactic polypropylene resin, etc., as the main resin component, and contains a considerable amount of filler, is heated and melted on the back side of the carpet, which is pre-backed with rubber latex or the like. It is manufactured by coating with According to this conventional method, it is not only extremely difficult to make the film thickness of the back sheet uniform, but also wrinkles and curls are likely to occur in the carpet, and only carpet fabrics with high heat resistance can be used. However, even if a coating machine equipped with a special cooling device is used, the processing speed is slow and post-processing is not possible immediately after coating, so this method has very poor workability in practice. In addition, the adhesive strength between the backing material such as rubber latex of the carpet fabric and the back sheet is not sufficient, so the carpet fabric may fray from the periphery of the carpet tile when cutting it into the desired shape or after years of use. There were some drawbacks such as the film becoming flaky and starting to peel off. The present inventors have conducted extensive research into an adhesive composition for manufacturing carpet tiles that solves the above-mentioned drawbacks and firmly adheres carpet fabric and backsheet of uniform thickness, and as a result, they have arrived at the present invention. In other words, while the hot melt adhesive applied to the back side of the carpet fabric is in a molten state,
In the carpet tile, in which backsheets containing polyolefin as the main resin component and having a thickness of at least 1 mm are superimposed, the two are bonded together using a pressure roll, and after cooling, the backsheet is cut into the desired shape, the hot melt adhesive A is styrene-based. , 20 to 60% by weight of an ABA type block copolymer in which B is a rubber type,
An adhesive composition for manufacturing carpet tiles, comprising 20 to 60% by weight of aromatic petroleum resin and 10 to 40% by weight of aliphatic petroleum resin, and containing other additives as necessary. It is related to. Cheap asphalt compositions and vinyl chloride resins are known as materials for carpet tile backsheets, but these produce bad odors during processing, so they should not be used unless large-scale deodorization equipment is installed. Can not. Therefore, in the present invention, polyolefin, especially inexpensive atactic polypropylene (APP), is used as the main resin component, and normally 50 to 500 parts by weight of calcium carbonate, clay, etc. are used per 100 parts by weight of APP.
Fillers containing fillers such as silica, talc, barium sulfate, and zinc white are used. Using these materials, at least one
A sheet having a thickness of mm and a predetermined width may be continuously manufactured, and this may be rolled up or cut into a desired length. The carpet fabric used in the present invention is generally a cut type tufted carpet, a loop type tufted carpet, a needle punch carpet, etc., but is not particularly limited to the type of carpet. In the past, carpets were lined with synthetic rubber latex compound, etc., with the primary purpose of fixing piles, etc., and to prevent molten packing agents from flowing into the interior of the carpet fabric. However, this method requires a large vulcanization and drying device for vulcanization and drying, and the high temperature and long processing time tend to damage the carpet, creating problems in terms of workability and economy. Therefore, it is known that for some types of carpets, a hot melt adhesive such as an EVA adhesive is used to back the carpet or to bond it to the base fabric using the laminating method or the sandwich method. Since the main resin component of the back sheet is APP, polyolefin has difficulty in adhesion, and the fiber base material of the carpet material is not fully fixed, resulting in poor durability and being used only for certain carpets. The hot melt adhesive method is not used for carpet tiles, which are subject to the harshest conditions for fraying of piles and peeling of backsheets, as they are cut into small pieces and used. It was empty. The present invention has been made based on the discovery that strong adhesion and good workability can be obtained by using a combination of specific resins in a specific ratio as an adhesive composition for manufacturing carpets. He completed his invention. Examples of ABA type block copolymers in which A is styrene and B is rubber are styrene, isoprene,
Styrene block copolymer (SIS), styrene
Zutadiene-styrene block copolymer (SBS)
etc. are known, but in the present invention, these
Obtained by graft polymerization, etc. by combining 10 to 40% of the styrene monomer as A of the ABA type block copolymer and 60 to 90% of isoprene and butadiene rubber as the rubber component of B.
ABA type block copolymers (elastomers) can be suitably used. However, it has been confirmed through experiments that even if the same elastomer is used, other rubber-based copolymers do not provide the same effects as the present invention. The ABA type block copolymer may be added in an amount of 20 to 60% by weight, preferably 30 to 50% by weight. If it is less than 20% by weight, the adhesive properties and flexibility of the adhesive layer will be poor, and if it is more than 60% by weight, the melt viscosity will be too high and it will be difficult for the adhesive to flow into the gaps between the fibers of the carpet material. This is undesirable because the fixation of piles etc. becomes poor. Next, aromatic petroleum resins include C ₅ - _{C 9} copolymer resins and C ₉ petroleum resins, but in the present invention,
_C9 petroleum resins with a softening point of 60 to 120°C can be used satisfactorily. When these resins are added in an amount of 20 to 60% by weight, optimal cohesive force is imparted to the adhesive when it is heated and melted, heat resistance creep is improved, and viscosity is lowered, which not only improves coating properties but also improves pile fixation. Becomes good. Next, as aliphatic petroleum resins, C ₄ to C ₅ fractions (mainly C ₅ fractions) obtained by cracking naphtha are used.
An aliphatic petroleum resin obtained by cationic polymerization of is used, and those having a softening point of 60 to 120°C are particularly preferred. By using this resin, the open time can be extended, making it suitable for lamination.
10 as it can also improve adhesion and flexibility.
It is necessary to add more than 40% by weight, but if it is added more than 40% by weight, the heat-resistant creep will be insufficient or the adhesive will become too strong, making it easier for the adhesive to adhere to the blade when cutting carpet tiles, making it difficult to work. It is inappropriate because it harms sexuality. The adhesive composition for manufacturing carpet tiles according to the present invention may contain plasticizers, waxes, fillers, antioxidants, and various other additives within the range that does not impede the purpose of the present invention. good. The best effect can be obtained when the adhesive composition for manufacturing carpet tiles according to the present invention (hereinafter referred to as adhesive composition) has a melt viscosity of 30 to 300 poise at 170°C. If it is more than this, the painting workability will be impaired and the penetration into the base fabric will be insufficient, which will have a negative effect on the adhesion.If it is less than this, the penetration into the base fabric will be large enough to cause seepage. However, this is not preferable because the film thickness decreases, resulting in poor adhesion and poor creep properties. A roll coater method or the like can be used to apply the adhesive composition of the present invention to the back side of the carpet fabric supplied from the storage roll, but extrusion processing is preferred due to the processing speed and ease of adjusting the amount of application. The orifice method is optimal. While the adhesive applied to the back of the carpet fabric is still in a molten state and retains its tackiness, a backing sheet supplied from a storage roll is superimposed on the applied surface and sent to a pair of nip rollers to apply pressure. is added and then cooled to complete the bond between the carpet fabric and the backsheet. Afterwards, it may be rolled up for storage, but it can be immediately cut into a desired shape, so carpet tiles can be manufactured continuously. When the adhesive composition of the present invention is used, carpet fabrics do not need to be lined in advance, and there is no risk of pollution, so special equipment is not required, and the hot melt adhesive method allows extremely efficient production. This is possible. The carpet tile manufactured according to the present invention is
The pile system is tightly fixed and fixed, does not peel off or loosen from the back sheet, does not show signs of aging even after long-term use, has excellent durability such as being able to withstand bending, and has excellent adhesive application amount. It is also economical because it requires less amount of water than the solution method. Furthermore, the uniformity of the thickness of the backsheet, which affects the quality of the carpet tile, can be achieved easily by manufacturing the backsheet in advance using optimal manufacturing equipment, so any thickness can be easily achieved. Next, typical examples of the present invention will be shown and explained in detail along with comparative examples. In the examples, % and parts indicate weight % and parts by weight. Example 1 SIS (14% styrene, 86% isoprene, trade name Califrex TR1107, manufactured by Shell Chemical Co., Ltd.) 35%, aromatic petroleum resin (softening point 95°C, trade name Neopolymer S, manufactured by Nippon Petrochemicals Co., Ltd.) 45%, fat The adhesive composition of the present invention, which is blended with 20% of family petroleum resin (softening point: 94°C, trade name: Quinton C100, manufactured by Nippon Zeon Co., Ltd.) and mixed by heating and melting, is melted at 170°C in a melting tank.
A 100% nylon-based fabric is tufted using a polypropylene split yarn plain weave fabric as the first base fabric, which is extruded from a discharge port with a gap of about 1 mm using a gear pump and supplied from a storage roll, and has a thickness of about 7 mm.
35 parts of APP (average molecular weight 8000, trade name Sumichikku SK11 manufactured by Sumitomo Chemical Co., Ltd.), heavy 50 parts of calcium carbonate, 7 parts of EVA (vinyl acetate 20%, MI150, trade name Evaflex 420 manufactured by Mitsui Polychemical Co., Ltd.), and 8 parts of rosin ester (softening point 80℃) in a kneader.
After melt-mixing at 130°C, calender processing was performed, and a back sheet having a thickness of 2 mm and a width of 500 mm was overlapped with the adhesive side and bonded with a nip roll at a pressure of 0.5 kg/cm ² . The processing speed was approximately 40 m/min. Note that the processing speed in conventional coating and cooling methods is 8 to 10 m/min. Thereafter, it was cut into squares of 45 x 45 cm to obtain carpet tiles. Example 2 As an adhesive composition of the present invention, SBS (styrene
28%, butadiene 72%, trade name Cauliflex
TR1102 manufactured by Ciel Chemical Co., Ltd.) 40%, aromatic petroleum resin (product name Neopolymer S) 40%, aliphatic petroleum resin (softening point 70℃, product name Quinton B170)
It was manufactured in the same manner as in Example 1 except that a 20% compound (manufactured by Nippon Zeon Co., Ltd.) was used. Comparative Example 1 As a hot melt adhesive, EDPE (Mooney viscosity ML ₁₊₄ (100℃) 60, product name Mitsui EPT2070
Mitsui Petrochemical Co., Ltd.) 35%, aromatic petroleum resin (Neopolymer S) 45%, aliphatic petroleum resin (Quinton (100) 10%, naphthenic oil (product name: Cielflex 371JY, manufactured by Ciel Chemical Co., Ltd.) Everything was manufactured in the same manner as in Example 1, except that a compound with a concentration of 10% (especially used because it is necessary to improve solubility) was used. Comparative Example 2 As a hot melt adhesive, SBR (Mooney viscosity ML ₁₊₄₎ was used. (100℃) 60, product name Hiker 2001 (manufactured by Nippon Zeon) 35%, aromatic petroleum resin (Neopolymer S) 45%, aliphatic petroleum resin (Quinton)
C100) and 10 parts of naphthenic oil (Cielflex 371JY) were used, but everything was produced in the same manner as in Example 1. Comparative Example 3 EVA (vinyl acetate 28%,
MI150 Product name Evaflex 220 (manufactured by Mitsui Polychemical Co., Ltd.) 45%, Rosin ester (Rosin Glycerin Ester S.P95℃ Product name Super Ester)
S100 (manufactured by Arakawa Chemical Co., Ltd.) 40% and microcrystalline wax (15%) were used in the same manner as in Example 1. Comparative Example 4 As a hot melt adhesive, a mixture of 15% SIS (Califlex TR1107), 60% aromatic petroleum resin (Neopolymer S), and 25% aliphatic petroleum resin (Quinton (100)) was used. All products were manufactured in the same manner as in Example 1. Comparative Example 5 As a hot melt adhesive, 70% SBS (Califlex TR1102), 15% aromatic petroleum resin (Neopolymer S), and 15% aliphatic petroleum resin (Quinton) were used.
B170) was manufactured in the same manner as in Example 1, except that a 15% compound was used. Comparative Example 6 As a hot melt adhesive, 35% SIS (Califlex TR1107), 20% aliphatic petroleum resin (Quinton (100)), and polyterpene resin (softening point 100) were used.
℃, trade name YS Gin PX1000 (manufactured by Yasushi Oil Co., Ltd.) 45%
It was produced in the same manner as in Example 1 except that the compound (used in place of the aromatic petroleum resin) was used. Comparative Example 7 Hot melt adhesive: 35% SIS (Califlex TR1107), 50% aromatic petroleum resin (Neopolymer S), 15% rosin ester (Superester S100) (used in place of aliphatic petroleum resin) The product was manufactured in the same manner as in Example 1 except that the compound blended in Example 1 was used. Various measurements were performed on these Examples and Comparative Examples, and the results are shown in Table 1. The test method is as follows. ◎Test Method ΓAppearance Inspection Method The produced carpet tiles were observed for seepage of adhesive onto the tufted surface and for the occurrence of wrinkles and unevenness. Γ Tuft bond strength measurement method One pile from the prepared carpet tile was tested using an Instron tensile tester (pulling speed
500 mm/min), five pieces were measured, and the average value of the stress was taken as the tuft bonding strength. Method for measuring adhesive strength of Γ fabric/backing machine The lining side of a test piece cut into a 3 cm wide strip from the prepared carpet tile was reinforced with canvas, and subjected to an Instron tensile tester (pulling speed 500 mm/min) to measure fabric/backing strength. The T-peel stress between the backing agents was measured. Γ Creep test method A test material was prepared in the same way as the fabric/lining machine adhesion measurement method, a part of the fabric/backing material interface was peeled off, and the material was placed in an electric furnace at 60°C with a load of 200 g/cm applied at an angle of 180 degrees. The sample was left in a container for 24 hours, and the degree of progress of peeling was measured. Γ Flex crack resistance test method A rectangular test piece with a width of 50 mm and a length of 150 mm was cut out from the prepared carpet tile, and the test piece was bent 180 degrees 10 times to observe the occurrence of cracks and peeling. Γ Cutting aptitude test method Cut the created carpet tile into a square with a width of 30 cm and a length of 30 cm using an NT cutter. At that time, the suitability for cutting is evaluated by observing the presence or absence of adhesion to the cutter and the presence or absence of falling off of the pile at the same edge. 【table】

Claims (1)

[Claims] 1. While the hot melt adhesive applied to the back side of the carpet fabric is in a molten state,
In carpet tiles, in which backsheets containing polyolefin as the main resin component and having a thickness of at least 1 mm are superimposed, the two are bonded together using a pressure roll, and after cooling, the sheets are cut into the desired shape, the hot melt adhesive A is styrene-based. , 20 to 60% by weight of an ABA type block copolymer in which B is a rubber type,
An adhesive composition for manufacturing carpet tiles, comprising 20 to 60% by weight of aromatic petroleum resin and 10 to 40% by weight of aliphatic petroleum resin, and containing other additives as necessary. .