JPS5920701B2 - Standard sealing material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a standard sealing material, and in particular, it prevents the side surfaces of the sealant from being deformed, improves dimensional stability, and facilitates filling of joints. The purpose is to provide a standard sealing material that maintains waterproof properties for a long period of time after being filled.

Conventionally known standard sealing materials are made by extruding a rubber mixture containing rubber as the main ingredient into a string shape from an extruder, and overlaying this onto a wide supporting tape that has two to three times the double-sided releasability of the string-like sealant. Most of them are made into rolls.

However, in such conventional standard sealing materials, the end of the support tape protruding from the side surface of the sealant is folded toward the side during packaging, resulting in numerous folds and wrinkles in the tape on the side of the sealant. Due to these wrinkles, many irregularities are formed on the side surface of the sealant during storage, which significantly impairs the dimensional stability of the sealant. On the other hand, in order to avoid forming a gap between the joint wall and the sealant when filling the joint, the sealant must be pressed so that the above-mentioned unevenness disappears during the filling operation. The drawback is that the filling operation is complicated. In addition, in order to make the side surface freely deform by pressing the sealant when filling, the unevenness on the side surface disappears, and it is easy to adhere to the joint wall, a large amount of softener is added, and the pressure is applied at a rate of 1.1 mm/sec or more. The creep rate must be adjusted to have a creep rate of It has the disadvantage that it attracts dust, which worsens its appearance, and that it slumps over time, resulting in areas that lack waterproofness. In addition, sealing due to the bending and wrinkles of the support tape mentioned above; In order to prevent deformation of the side surface of the fern material, making the sealant and the support tape the same width will reduce the winding pressure when winding into a roll, the deformation and sealing during storage. Due to the interaction with the material's creef phenomenon, the sealing material protrudes from the sides and bonds across the sides of the tape, forming a mutually integrated layer at the sides, making it difficult to unwind during use. There are some drawbacks.

The inventors of the present invention have conducted various studies in order to prevent such flow deformation of the sealant toward the side surface.

However, this type of sealant needs to have good adhesion to the joint walls, as well as less shrinkage and fluidity over time. It has been learned that a sealing material that satisfies both shrinkage resistance and shrinkage resistance cannot be obtained. As a result of further various studies, the inventors of the present invention found that when the composition of the main component of the sealant, which is mainly composed of rubber, is within a specific range and the sealant produced satisfies specific properties. In addition, it has good adhesion to the joint wall and resistance to shrinkage over time, and even when the sealant is rolled up in a roll through a support tape of the same width, the sealant material flows to the sides and becomes integrated with each other. The present invention was completed by discovering the fact that a satisfactory effect can be obtained without having to do so. That is, the present invention involves superimposing a string-like viscoelastic sealing material and a supporting tape having the same width as the sealing material and having a peeling function on both sides, and winding the tape around a winding core so that the tape becomes the outermost surface. has been and before
The sealing material listed in z is at least 20% of the total weight of the rubber base material.
Machine oil (J
Swelling degree against ISK-22142 oil) is 200-8
3. A viscoelastic material in which 50 to 500 parts by weight of a filler and 20 to 250 parts by weight of a softener are added to 100 parts by weight of the rubber main material, and the creep rate is determined by the test method described below. is 0.05~0.851L7
! The present invention provides a standard sealing material characterized in that it is adjusted to have a flow shape variation ability of L/Sec.

According to the standard sealing material of the present invention, as is clear from the examples described later, flow deformation due to passage of time is extremely small, so that the sealing material does not flow and impede the unwinding property. Since it is maintained in a smooth state, good adhesion to the joint wall can be achieved.

Incidentally, the creep rate used in this specification and claims refers to the sealing material made into a flat plate of 50 x 50 x 10 uu, aluminum plates bonded to both sides of the sealing material, and a load of 400y/Cd applied to the aluminum plate at 20°C. Specifies the value of the deformation speed when applied perpendicular to .

Further, the degree of swelling refers to the value of the volume ratio of the sample piece before immersion to that after immersion when the sample piece is immersed in JISK-2214 machine oil No. 2 for 24 hours.

Rubbers used in the practice of the present invention include natural rubber (NR), isobrene rubber (IR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), polyisobutylene rubber, butyl rubber, ethylene-propylene-diene rubber, Acrylic rubber, styrene-isoprene (or butadiene)-styrene block copolymer, ethylene-1-butene copolymer, etc., which may be used alone or in combination.
More than one species can be used in combination. As the rubber, for example, a cross-linked powder rubber is added so as to account for at least 20%, preferably 30 to 70% of the total weight of the rubber base, or
Alternatively, as described below, when mixing the rubber base material with fillers, softeners, and other compounding agents, a small amount of crosslinking agent such as sulfur, sulfur compounds, zinc white, hexamethylene diamine carbamate, poly-para-dinitroso-benzene is used. In order to suppress flow deformation of the sealant, it is important to use a rubber base resin which is cross-linked by adding such as, for example, a rubber base resin whose degree of swelling with respect to machine oil is 200 to 800%.

The filler used in carrying out the present invention is one that adjusts the viscosity of the viscoelastic sealant and its shrinkage over time,
For example, organic materials such as recycled rubber, shellac, wood flour, cork powder, and/or calcium carbonate, clay, talc,
Inorganic fillers such as asbestos, pumice powder, and glass fiber are suitable. The softener imparts appropriate flexibility to the viscoelastic sealant, such as paraffin or aromatic process oil: liquid paraffin,
Paraffins such as vaseline; Aliphatic softeners such as castor oil and soybean oil; waxes such as beeswax and lanolin; and other suitable materials such as liquid polyisobutylene rubber and polybutene. These materials are made by adding 50 to 500 parts by weight of a filler and 20 to 250 parts by weight of a softening agent to 100 parts by weight of a rubber base material, and further adding carbon black, silica, etc. as necessary. Rubber reinforcing agents, other compounding agents such as anti-aging agents, colorants, and tackifying resins are added.

Therefore, the filler content is 50 to 50 parts by weight per 100 parts by weight of rubber.
It is important to maintain the range of 0 parts by weight; if it is less than 50 parts by weight, the viscoelastic sealant will become too soft and will flow out even if it is filled into the joints, impairing waterproof properties.
If it is more than 0 parts by weight, it becomes too hard and lacks adhesion to the joint wall, so it cannot follow the expansion and contraction of the building materials that make up the joint, impairing waterproof properties. In addition, in the case of a softener, if it is less than 20 parts by weight, the viscoelastic sealant will lack viscosity;
If the amount is more than 1 part by weight, the viscosity is high and the fluidity is high, so when the sealing material is wound into a roll, there will be a lot of flow deformation toward the sides, which is undesirable.

However, viscoelastic sealants consisting of these ranges are
The above-mentioned materials and additives added as needed are skillfully used, and the creep rate is 0.05 m7! L/S
It is necessary to adjust the properties to a range of ec to 0.8511/Sec.

According to the results of experiments conducted by the inventors, machine oil (
Swelling degree for JISK-22142 oil) is 200~
A viscoelastic sealant consisting of 800% rubber base material, filler, and softener has each material mixed within the above-mentioned specific range, and the creep rate of the viscoelastic sealant is 0.5 mu/Sec-0. Having a range of 85 mm/Sec means that even if it is overlapped with a support tape that has the same width as the sealant and has a peeling function on both sides and is wound into a roll around a winding core, there will be no flow deformation and the winding will not occur over time. It was found that it can be easily returned and has an excellent waterproof effect.

That is, if it is less than 0.051L1L/Sec, it will not fit well into the joint area and may impair waterproofness over time.
At 85 mm/Sec or more, the flow deformability is large, and a phenomenon occurs in which the roll-shaped sealing material causes flow deformation toward the side surface due to a slight external stress.

The viscoelastic material is manufactured using known manufacturing means such as extrusion and calender roll, for example, to a thickness of about 3 to 30 mζ and a width of about 5 to 30 m.
It is formed into a flat string with a length of 50 mm and a length of about 3 to 100 m, but it can be made into a flat string with a width of 500 to 100 mm using the manufacturing method described above.
A 0 mm sealing material raw fabric is produced, a support sheet with a peeling function on both sides is superimposed on one side, and the support sheet is wound on a core such as a paper tube with the outermost surface to obtain a raw fabric roll. The roll can be cut into a desired width to form a flat string.

The above-mentioned supporting tape (or film) with a peeling function on both sides can be made of resin-treated paper, which is made by laminating a paper material such as kraft paper with a plastic such as polyethylene resin and baking a silicone polymer on the laminated surface, or plastic. It consists of a releasable film with silicone polymer baked onto the film surface.

The standard sealing material of the present invention configured as described above is
By using a viscoelastic material blended in a specific range and a creep rate adjusted to a specific range, even if the viscoelastic sealant and support tape of the same width are overlapped and rolled into a roll,
The sealing material does not flow and deform to the sides and become integrated with each other across the support tape, so it is easy to unwind, and the sealing material and the support tape are configured to have the same width to fill the joints. It has the characteristic of being easy to use.

Further, as is clear from the examples described later, there is also the advantage that the adhesiveness to the joint wall is good. Examples of the present invention will be shown below.

The words "part of the text" indicate parts by weight. Example 1 The following formulation was mixed at room temperature and put into an extrusion molding machine maintained at 80 to 90°C to form a 5mTfL. Width 15mm
Extrude a string-like viscoelastic sealant, laminate polyethylene resin on the surface of kraft paper on one side of the extruded sealant, and superimpose a support tape with a width of 15 mm on which silicone polymer is baked on the laminated surface, A standard sealing material of the present invention was obtained by winding the tape around a paper tube with the tape facing the outermost surface.

The total length of the sealant is approximately 30 m. This characteristic is shown in Table 1. Example 2 100 parts of butyl rubber and 0.5 parts of poly-para-dinitrosobenzene were mixed and heat treated in a mixer at 140°C for 10 minutes, then 30 parts of ethylene-propylene terpolymer rubber was added and and further added 150 parts of calcium bicarbonate, 80 parts of polybutene (H-300),
Add 20 parts of hydrated silicic acid and 25 parts of petroleum-based resin, mix, mold into 10 m thick and 500 m 1 L, and coat one side with 500 m
The support sheets (same as Example 1) with a width of about 100 mm are stacked and wound around a paper tube with the sheets facing outward to obtain a raw fabric roll, and the roll and the paper tube are cut to a width of 2011 mm to form the standard form of the present invention. Obtained sealant.

Note that the total length of this sealing material is approximately 10 m. This characteristic is shown in Table 1. As is clear from the above examples, the standard sealing material of the present invention is notable for the fact that there is no flow deformation toward the side surface due to aging, and the adhesive strength is sufficient.

Claims (1)

[Claims] 1. A string-like viscoelastic sealing material and a support tape having the same width as the sealing material and having a peeling function on both sides are overlapped and wound around a core with the tape being the outermost surface, The sealing material is a machine oil (JIS K-2214 No. 2 oil) formed by adding a crosslinked powder rubber to account for at least 20% of the total weight of the rubber base material, or crosslinking the rubber base resin using a small amount of a crosslinking agent. A rubber base material having a swelling degree of 200 to 800%, and a rubber base material having a swelling degree of 200 to 800%.
50-500 parts by weight of filler, 20-25 parts by weight
It is made of a viscoelastic material to which 0 parts by weight of a softener has been added, and has a creep rate of 0.05 to 0.05 according to the test method described in the text.
A regular sealing material, characterized in that it is adjusted to have a flow deformability of 0.85 mm/sec.