JPH0411636A - Corrosionproof and waterproof tape and its production - Google Patents

Abstract

PURPOSE:To obtain the title tape which can keep its excellent corrosionproofness and waterproofness for a long time by impregnating a cloth strip with a liquid compound comprising a specified binder, a curing agent therefor, a pigment, etc., and forming a resin component having a rubbery elasticity by heat curing. CONSTITUTION:A cloth strip (usually a nonwoven cloth) is impregnated with a liquid compound comprising a binder comprising a liquid polymer having at least two functional groups (e.g. polyether polyol or hydroxyl-terminated 1,4-polybutadiene), a curing agent therefor (e.g. tolylene diisocyanate urethane prepolymer), a plasticizer (e.g. dioctyl phthalate), a filler, and a pigment, and the amount of the liquid compound infiltrated is adjusted. The liquid compound is cured by reacting with heating to form a corrosionproof and waterproof tape. According to the above process, a corrosionproof and waterproof tape of excellent performances can be mass-produced inexpensively by a series of steps.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to anticorrosive and waterproof tapes that are coated on the surfaces of piping and metal walls of various plants.

Conventional technology Conventionally, petrolatum-based tapes have been known as this type of anti-corrosion and waterproof tape, and were used to coat the surfaces of plant piping and metal walls for anti-corrosion and waterproofing purposes. .

Problems to be Solved by the Invention However, in conventional petrolatum-based tapes, the melting temperature of petrolatum itself is relatively low, which causes the components to drip at high temperatures, and conversely, the tape becomes less flexible at low temperatures. Therefore, there was a problem in that the uses of the tape were greatly restricted.

In addition, petrolatum-based tapes do not have a suitable adhesive for joining the tapes together, so they must rely on the adhesive strength of the petrolatum compound itself for joining, which may cause the tape to peel off depending on the location where it is applied. , there was a problem that the rust prevention function was impaired.

In addition, because it is difficult to color conventional petrolatum-based tapes, conventional tapes of this type are not colored. Separate methods such as wrapping a new layer of colored tape have been applied to deal with the problem.
This has the problem that the number of steps increases, workability is poor, and the working time is long.

Conventionally, when manufacturing petrolatum-based tapes, impregnating nonwoven fabric with petrolatum compound requires the following steps:
It is necessary to maintain the compound in a liquid state, and for this reason, it is necessary to heat the dung compound from the outside, which poses problems such as the need for large-scale equipment.

The purpose of this invention is to solve the above-mentioned problems of the prior art, and because it is a reaction-cured product, it does not melt unlike conventional petrolatum compounds, and prevents the components from dripping at high temperatures. It is possible to maintain excellent anti-corrosion and waterproof properties for a long period of time, and it can be wrapped around pipes, etc. even in low-temperature conditions, and there is no need to worry about the tape peeling off, providing excellent anti-corrosion properties. It can last for a long time, and the tape can be easily colored, so it can be used as is in areas where coloring is required and design is required.
To provide an anticorrosion/waterproof tape that can be used, has excellent workability, and is easy to manufacture, and a method for manufacturing the same.

Means for Solving the Problems In order to achieve the above object, the first invention of the present invention is as follows:
It consists of a band-shaped base fabric and a resin component with rubber-like elasticity impregnated into the base fabric, and the resin component contains a binder made of a liquid polymer having two or more functional groups, and a curing agent for this. , the gist is an anticorrosion/waterproof tape formed by a curing reaction of a liquid compound consisting of a plasticizer, filler, and pigment.

A second invention of the present invention is a method for producing the above-mentioned anticorrosive/waterproof tape, wherein a binder made of a liquid polymer having two or more functional groups and a hardening agent thereof are added to a band-shaped base fabric. , a step of impregnating a liquid compound consisting of a plasticizer, a filler, and a pigment, and adjusting the amount of impregnation of the liquid compound, and then heating and curing the liquid compound by reaction to form a resin with rubber-like elasticity. The gist of this paper is a method for producing anticorrosion/waterproof tape, which consists of the steps of forming the ingredients and obtaining the tape.

In the above, a nonwoven fabric is usually used as the base fabric.

Here, the nonwoven fabric is obtained by arranging fibers in the form of a web (thin cotton) or mat, and bonding the fibers together using an adhesive or the fusing force of the fibers themselves. Further, instead of such a nonwoven fabric, a coarsely textured woven fabric or the like may be used.

The number of binders made of the above-mentioned liquid polymer is 2 or more, usually 2 or more.
It has 5 functional groups, preferably 2 to 4 functional groups. Examples of the functional group include a hydroxyl group, a thiol group, a carboxyl group, a bromine group, etc. Among them, it is preferable to use a hydroxyl group.

Here, specific examples of the liquid polymer include polyether polyol, polyester polyol, acrylic polyol, terminal hydroxyl group], 4-polybutadiene, hydroxyl group 1.
Examples include those having a hydroxyl group as a functional group such as 2-polybutadiene.

In order to obtain a rubbery component with good quality and high elasticity after curing, it is preferable in the present invention to use a so-called telechelic liquid polymer having a functional group at the end, but it is not limited to this. If it has a functional group,
Others can also be used.

As the curing agent for the binder, in the case of a functional group of the binder such as a hydroxyl group, a thiol group, or a carboxyl group, an isocyanate compound, an aziridine compound, an epoxyamine compound, etc. can be used; When is a bromine group, a polyamine compound or the like can be used.

Most preferably, the functional group of the binder is a hydroxyl group. This is because a binder having a hydroxyl group as a functional group has a lower viscosity than other binders, is easier to handle in liquid form, and is less expensive.

When the binder is made of a liquid polymer having a hydroxyl group, specific examples of the curing agent include TDI (tolylene diisocyanate)-based urethane prepolymer, modified MDI (diphenylmethane-4,4'-diisocyanate). , modified TDI, isopropylidene dicyclohexyl isocyanate, and the like.

Examples of the plasticizer include DOP (dioctyl phthalate), DBP (dibutyl phthalate), and DIBP.
Phthalate esters such as (diisobutyl phthalate) DHP (dioctyl phthalate), DOA
(2-ethylhexyl sepacade) Use aliphatic dibasic acid esters such as DO3 (di-2-ethylhexyl sepacade), aromatic carboxylic acid esters such as ethylene glycol benzoates, etc. .

As the filler, for example, inorganic fillers such as heavy calcium carbonate, silica powder, magnesium carbonate, aluminum silicate (fired ray), aluminum hydroxide, magnesium silicate (talc), and calcium silicate (wollus night) are used.

As the pigment, organic pigments such as azo-based and triphenylmethane-based pigments, and inorganic pigments such as chromium oxide, titanium oxide, and zinc oxide are used.

Other liquid compounds include anti-aging agents such as 2,2-methylenebis(4-ethyl-6-t-butyl)phenol, curing catalysts such as dibutyltin dilaurate,
Zinc naphthenate, carbonic acid Ca, Ba, Mg, A
I, Zn.

salts with pb, and sulfonic acids Na, Ca.

It goes without saying that rust preventive agents such as Ba and Zn salts may be added as appropriate.

The method for manufacturing the anticorrosive/waterproof tape includes a step of impregnating a base fabric such as a band-shaped nonwoven fabric with the liquid compound, and adjusting the impregnated amount of the liquid compound.
heating to ~100°C to cure the liquid compound by reaction to form a resin component having rubber-like elasticity;
This process consists of the process of obtaining anti-corrosion and waterproof tape.

The thickness of the resin component having rubber-like elasticity of the anticorrosive/waterproof tape can be adjusted as appropriate, for example, by adjusting the distance between a pair of squeezing rollers through which the liquid compound-impregnated base fabric passes. The thickness of such a resin component is 0
．． 5 to 5111 mm%, preferably 1.0 to 3.0 mm.

In addition, in the above manufacturing method, the liquid compound is liquid not only at room temperature but also around 0°C, so there is no need to heat the compound to impregnate the nonwoven fabric during tape manufacturing, which improves workability. Excellent.

By the way, when the functional group of the binder contained in the above liquid compound is a hydroxyl group, an isocyanate is used as a curing agent, or the isocyanate group of this curing agent [
NGO] and the hydroxyl group [OR3 of the binder [NCO]
/ [By changing OH, the adhesive force of the resin component having rubber-like elasticity formed from a liquid compound can be adjusted.

The ratio of such isocyanate groups to hydroxyl groups [N CO
/ [OR3 is preferably 1.0 to 2.0; when the value of this ratio approaches 1.0, the adhesive force increases, and conversely, when the value of this ratio approaches 2.0, the adhesive force decreases.

Function: According to the above-mentioned anticorrosion/waterproof tape, since the resin component having rubber-like elasticity formed by the curing reaction of the liquid compound is a reaction cured product, dripping of the component under high temperature conditions is prevented. It is possible to maintain excellent anti-corrosion and waterproof properties for a long period of time. In addition, the resin component with rubber-like elasticity allows the tape to have sufficient flexibility even at low temperatures, making it possible to wrap it around pipes, etc., so there are no restrictions on the tape's uses. .

The above-mentioned anti-corrosion/water-proof tape can be bonded using, for example, a urethane adhesive, so if the tape is to be installed in a complex shape where peeling is a concern, by using the adhesive, It can completely prevent the tape from peeling off and provide excellent anti-corrosion properties for a long period of time.

Furthermore, anti-corrosion and waterproof tapes can be easily colored by adding pigments to the components of the liquid compound, so they can be used as is in areas where coloring is required and design is required. It can be easily colored and has excellent workability.

In addition, in the manufacturing method of anti-corrosion and waterproof tape, since the liquid compound is liquid not only at room temperature but also around 0°C, it is necessary to impregnate the non-woven fabric with the compound.
There is no need to heat the compound, so workability is excellent.

According to the manufacturing method of the present invention, it is possible to mass-produce anti-corrosion and waterproof tapes with excellent performance through a series of steps, and the anti-corrosion and waterproof tapes can be supplied to the market at low cost. .

Example Next, embodiments of the invention will be described with reference to the drawings.

Example 1 Referring to FIG. 3, a liquid compound (13) having the following composition was mixed in a dipping tank (12) and stirred until uniform.

Then, the strip-shaped non-woven fabric (11) wound into a coil shape,
Guided by guide rollers (15a) to (15e), it passes through the dipping tank (12) while being sequentially rewound;
A nonwoven fabric (11) was impregnated with a liquid compound (13). At this time, the strip-shaped nonwoven fabric (11) is placed in the dipping tank (12).
), the distance between the pair of squeezing rollers (16) (1G) through which the liquid compound-impregnated nonwoven fabric passes is adjusted, and finally the resin component of the anticorrosive/waterproof tape (2) is To achieve the desired thickness,
The amount of liquid compound (13) impregnated was adjusted. Next, the liquid compound-impregnated nonwoven fabric is passed through a heating furnace (14) and heated to 50 to 100°C to form a liquid compound (13).
is subjected to a curing reaction to form a resin component having rubber-like elasticity, and the resulting anticorrosion/waterproof tape (2) is used as a guide/
Guided by rollers (15f') and (15g>,
It was wound into a coil to produce an anticorrosion/waterproof tape (2).

Liquid compound composition I Liquid polymer 94.7 parts by weight: Polyether polyol (product numbers P21 and P31, manufactured by Takeda Pharmaceutical Company Limited) Curing agent 16.72 parts by weight: Modified M
DI (trade name PM-35, manufactured by Mitsui Toatsu Chemical Co., Ltd.) Here, the ratio of isocyanate groups to hydroxyl groups [NCO]
/ [OR3-1,16 Curing catalyst 1.2 parts by weight Nidibutyltin dilaurate (trade name Stan BL, manufactured by Mitsui Toatsu Chemical Co., Ltd.) Plasticizer 286.3 parts by weight: DOP
(manufactured by Sekisui Chemical Co., Ltd.) Filler 305.5 parts by weight; heavy calcium carbonate (product name 5L-100, manufactured by Takehara Chemical Co., Ltd.) Pigment titanium dioxide 10.5 parts by weight (product name RKB-3, Bayer Corporation) 10.0 parts by weight (product name: p)
v Yellow 500, manufactured by Mikuni Shiki Co., Ltd.) Anti-aging agent 1.8 parts by weight: 2.2
--Methylenebis(4-ethyl6-t-butyl)phenol (trade name N5-5, manufactured by Ouchi Shinko Kagaku Co., Ltd.) Referring to Figures 1 and 2, a steel pipe with a diameter of 70 mm (1
) After removing water, oil, dust, rust, etc. from the surface of the tape in advance and applying a primer (3), the anticorrosion/waterproof tape (2) obtained as described above is overlapped by 50 to 60%. I tied them together and wrapped them together while pulling them tightly. Tape (2)
At the beginning and end of the winding, sealing agent (4) was applied to prevent rainwater from entering from the ends to form a complete waterproof system.

According to the anticorrosion/waterproof tape (2), since the resin component having rubber-like elasticity is a reaction cured product,
No dripping of the resin component was observed even when the product was left in a high temperature state of ℃.

Further, the tape (2) had sufficient flexibility even at a low temperature of -20°C, and it was possible to wrap the tape (2) around the pipe (1).

Moreover, since tape (2) can be bonded using urethane adhesive, peeling of tape (2) can be completely prevented even in complex-shaped construction areas where peeling of tape (2) is a concern. It was able to prevent rust and exhibited excellent rust prevention function for a long period of time.

In addition, regarding the steel pipe (1) wrapped with the anticorrosive/waterproof tape (2) according to the present invention, the temperature at 35°C and 5%
When a salt spray test (JIS22371) using salt water was conducted, no rust was observed even after one year.

Similarly, the anticorrosion/waterproof tape (2) according to the present invention
When an atmospheric exposure test (JIS Z0304) was conducted on the steel pipe (1) wrapped around the steel pipe, no rust was observed even after one year.

In addition, the anticorrosive/waterproof tape (2) is colored yellow by adding a pigment to the liquid compound (13) during its manufacture, so coloring is necessary and design is required. It can be used as is in any location, and has excellent workability.

In addition, when manufacturing tape (2), liquid compound (1
3) is liquid not only at room temperature but also around 0°C, so there is no need to heat it to impregnate the nonwoven fabric (11) with the compound (13), and it has excellent workability.

Example 2 An anticorrosive/waterproof tape (2) was produced in the same manner as in Example 1 above, except that a liquid compound (13) having the following composition was used.

Liquid compound composition ■ Liquid polymer 100.0 parts by weight = 1.4
-Polybutadiene (trade name R45-HT).

(manufactured by Idemitsu Petrochemical Co., Ltd.) Curing agent 15.04 parts by weight: Isopropylidene dicyclo-hexyl isocyanate (manufactured by Mitsui Toatsu Chemical Co., Ltd.) Here, the ratio of isocyanate groups to hydroxyl groups [N CO
Co/[OH Co-1, 25 curing catalyst
1.2 parts by weight Nidibutyltin dilaurate (trade name Stan BL) Plasticizer: DOP 300.0 parts by weight Filler 282.3 parts by weight Heavy calcium carbonate (trade name 5L-100) Pigment: Titanium oxide 15.0 parts by weight (Product name R
KB-3) Synthetic dye (yellow) 10.0 parts by weight (product name p
v Yellow 500) Anti-aging agent 1.5 parts + 2.2
--Methylenebis(4-ethyl-6t-butyl)phenol (trade name N5-5) The anticorrosive/waterproof tape (2) of Example 2 thus obtained was treated in the same manner as in Example 1 above. Steel piping (1)
When the film was wound around the film, the same effect as in Example 1 was obtained.

In particular, when the steel pipe (1) wrapped with the anticorrosive/waterproof tape (2) according to Example 2 was subjected to a salt spray test and an atmospheric exposure test, no rust was observed even after one year. The tape (2) had an excellent rust prevention function.

Example 3 An anticorrosive/waterproof tape (2) was produced in the same manner as in Example 1 above, except that a liquid compound (13) having the following composition was used.

Liquid compound composition ■ Liquid polymer 1816 parts by weight Niacrylic polyol (trade name manufactured by Oresta Mitsui Toatsu Chemical Co., Ltd.) Curing agent 16.72 parts by weight: Modified M
DI (trade name PM-35,) where the ratio of incyanate groups to hydroxyl groups [NGO]
/ [OH]-1,16 Curing catalyst dibutyltin dilaurate (trade name Stan BL) Plasticizer: DOP Filler: Ground calcium carbonate (trade name 5L-1,00) Pigment 1.2 parts by weight 297.4 parts by weight 305.5 parts by weight Titanium dioxide 10.5 parts by weight (product name R
KB-3): Synthetic pigment (yellow) 10.0 parts by weight (trade name PV Yellow 500) Anti-aging agent 1.8 parts by weight: 2.2
--Methylenebis(4-ethyl-6-t-butyl)phenol (trade name N5-5) The anticorrosive/waterproof tape (2) of Example 3 obtained in this way was used in the case of Example 1 above. Similar to steel piping (1)
When the film was wound around the film, the same effect as in Example 1 was obtained.

In addition, when the steel pipe (1) wrapped with the anticorrosive/waterproof tape (2) according to Example 3 was subjected to a salt spray test and an atmospheric exposure test in the same manner as in Example 1, both results were positive. No rust was observed even after one year had passed, and the tape (2) had a good rust prevention function.

Effects of the Invention As described above, the anticorrosion/waterproof tape according to the present invention has the following features:
It consists of a band-shaped base fabric and a resin component with rubber-like elasticity impregnated into the base fabric, and the resin component contains a binder made of a liquid polymer having two or more functional groups, and a curing agent for this. , is formed by the curing reaction of a liquid compound consisting of a plasticizer, filler, and pigment, and because it is a resin component of anticorrosive/waterproof tape or a reaction-cured product, the components may drip under high temperature conditions. In addition to being able to maintain excellent anti-corrosion and waterproof properties for a long period of time, the tape has sufficient flexibility even at low temperatures and can be wrapped around pipes, etc. Therefore, there are no restrictions on the uses of the tape.

Furthermore, since the tape can be bonded using, for example, urethane adhesive, it is possible to completely prevent tape peeling even in complex-shaped construction areas where tape peeling is a concern. It can exhibit rust prevention function for a long period of time.

In addition, since the tape is easy to color, it can be easily colored by using it directly in areas where coloring is required and design is required, and there is no need to use the conventional separate method for coloring. There is no need to apply and deal with it.
It has excellent workability.

In addition, the method for producing an anticorrosion/waterproof tape of the present invention includes adding a binder made of a liquid polymer having two or more functional groups, a hardening agent thereof, a plasticizer, and a filler to a band-shaped base fabric. , a step of impregnating a liquid compound consisting of a pigment, and adjusting the impregnation amount of the liquid compound, then heating and curing the liquid compound by reaction to form a resin component with rubber-like elasticity, which is anti-corrosive and waterproof. According to the method of the present invention, it is possible to mass-produce anti-corrosion and waterproof tapes with excellent performance through a series of steps, and it is possible to produce anti-corrosion and waterproof tapes at low cost. It is something that can be supplied to the market.

In particular, liquid droppings are not only available at room temperature, but also at 0°C.
Since it is liquid even in the vicinity, there is no need to heat the compound to impregnate the nonwoven fabric with the dung compound during tape production, resulting in excellent workability.

[Brief explanation of drawings]

The drawings show an embodiment of the invention, and FIG.
FIG. 2 is a perspective view of the waterproof tape wrapped around a steel pipe, FIG. 2 is a longitudinal cross-sectional view of the same, and FIG. 3 is a schematic process diagram sequentially showing the manufacturing process of the anticorrosive/waterproof tape. (L)...Steel pipe, (2)...Anti-corrosion/waterproof tape,
(3)...Fixing agent, (4)...Sealing agent, (1
1)...Strip-shaped nonwoven fabric, (12)...Dipping tank, (1
3)...Liquid comparan (14)...Heating furnace,

Claims (2)

[Claims] (1) Consists of a band-shaped base fabric and a resin component with rubber-like elasticity impregnated into the base fabric, and the resin component contains a binder made of a liquid polymer having two or more functional groups, and a binder made of a liquid polymer having two or more functional groups. An anticorrosion/waterproof tape formed by a curing reaction of a liquid compound consisting of a hardening agent, plasticizer, filler, and pigment. (2) A step of impregnating a band-shaped base fabric with a liquid compound consisting of a binder made of a liquid polymer having two or more functional groups, a hardening agent thereof, a plasticizer, a filler, and a pigment. After adjusting the amount of liquid compound impregnated,
A method for producing an anticorrosion/waterproof tape, which comprises the steps of heating and curing a liquid compound by reaction to form a resin component having rubber-like elasticity to obtain an anticorrosion/waterproof tape.