JPH07197003A - Adhesive composition and method for bonding fiber to rubber - Google Patents

Abstract

PURPOSE:To obtain an adhesive compsn. which can bond a chloroprene rubber to a fiber and uses no org. solvent by compounding an RFL adhesive with an org. compd. having specific groups. CONSTITUTION:This adhesive compsn. contains a resorcinal-formalin-latex adhesive (an RFL adhesive) and an org. compd. having blocked isocyanate groups. When a fiber is bonded to a chloroprene rubber with the compsn., the blocking agent of the blocked isocyanate group separates from the compd. in the vulcanization step, allowing the resulting free isocyanate groups to react with active hydrogen atoms of the rubber to form cross-linking. Thus, the adhesion between the fiber and the rubber is enhanced. Since the compsn. is a water- base one, no org. solvent is used and bad influences on health are avoided.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a chloroprene rubber,
In particular, a W-type chloroprene-based rubber, or a rubber and a fiber in which a chloroprene-based rubber and a vulcanizable diene-based rubber are blended, and resorcin-formalin-latex-based adhesive (hereinafter referred to as RFL-based adhesive) without using cement. Abbreviated), and an adhesive composition used therefor.

[0002]

2. Description of the Related Art Chloroprene rubber is manufactured by DuPont.
It is a synthetic rubber with the oldest history developed in the 1930s, and is roughly classified into G type which is vulcanized by sulfur and W type which is slow in crystallinity and vulcanized by metal oxide. Chloroprene-based rubber is excellent in weather resistance, durability, chemical resistance, etc., flame retardant, is most commonly used, and is used in a large amount. In addition, unlike other special rubbers, it does not show a big defect with respect to certain specific properties, and the overall property is well balanced. It is soluble in organic solvents such as benzene, carbon tetrachloride and chlorobenzene. Further, since it is expensive to produce, it is often used by blending it with a diene rubber. At present, chloroprene rubber is often used alone or in a blend with other rubbers for automobile hoses and the like. In such an automobile hose, the above chloroprene rubber is used as a main material, and synthetic fibers are used as a reinforcing material. Therefore, in manufacturing a hose, it is essential to bond the synthetic fiber with the chloroprene rubber or the blend rubber of the chloroprene rubber and the diene rubber.

As a bonding mechanism for bonding rubber or rubber or fibers and rubber when manufacturing a rubber product, firstly, there is a chemical bond due to a chemical reaction between the rubber and fibers as an adherend. Adhesion can be mentioned. The second is adhesion by hydrogen bonding, and the condition is that there is a functional group that causes hydrogen bonding between the rubber and the adherend. Among these, in the adhesion of unvulcanized rubber and fiber,
There are mechanical adhesion by entanglement of fiber fiber and adhesive (anchoring effect), unevenness of fiber surface or penetration into fiber fiber, and chemical adhesion. In mechanical adhesion, the adhered rubber was dissolved with a solvent Examples include rubber glue and, for chemical adhesion, treatment of fibers with an RFL adhesive.
In the case of treating fibers with RFL adhesives, generally,
Hydrogen bonds were formed between the resorcinol-formalin (RF) and the fiber, the latex (L) and the unvulcanized rubber were co-vulcanized, and the anchoring effect produced by the RFL penetrating into the adhered fiber was integrated. Will be things. However, among chloroprene rubbers, W type chloroprene rubbers and rubbers obtained by blending diene rubbers and W type chloroprene rubbers are known to be difficult to bond to synthetic fibers such as nylon.

Conventionally, as a method of adhering a chloroprene rubber or a rubber obtained by blending a chloroprene rubber and a diene rubber to a fiber, generally, an RFL initial condensate and a chloroprene rubber latex, or an RFL initial condensate and a vinylpyridine styrene are used. A method has been adopted in which a mixed solution with a butadiene copolymer rubber latex is prepared, fibers are treated with such a mixed solution to be integrated with unvulcanized rubber, and vulcanized and adhered. However, the adhesion level is not sufficient to satisfy the durability of rubber products such as hoses, and the use of special rubber cement is indispensable for satisfying such durability. The rubber cement referred to here has a rubber to be adhered (adhered rubber) dissolved in an organic solvent and further has a free isocyanate group such as chlorinated rubber, phenol resin, methylene diisocyanate (MDI) or tolylene diisocyanate (TDI). An adhesion aid such as a polyisocyanate compound is added, which is applied to the adherend rubber and used for adhesion to fibers.

[0005]

However, in this method using cement, since an organic solvent is used, not only is there a risk of fire in the manufacturing process,
There are also health problems for people involved in this process. In addition, there is a problem that the storage stability is extremely poor because the adhesion aid having high reactivity as described above is added. In addition, there is one more process for producing cement, and for the above reasons, W does not use cement.
Good adhesion between the type of chloroprene rubber and the fiber has been desired.

Conventionally, for adhesion of organic polymer materials, particularly synthetic polymer materials such as polyester, nylon, polyvinyl chloride and polypropylene, which are generally difficult to adhere, polyisocyanate compounds having a free isocyanate group, or Urethane prepolymers and the like have been used, but these free isocyanate groups easily react and change in quality due to moisture, etc., and if they change, the adhesiveness decreases, and in addition, a highly volatile organic solvent is used. Since it is contained in a large amount, there is a risk of ignition and the organic solvent itself is harmful to the human body. Therefore, it was considered to block the end of the isocyanate group of the organic compound having an isocyanate group and use this as an adhesiveness improving agent. An organic compound having a blocked isocyanate group whose end is blocked is described in JP-B-63-51474 and described as an adhesion improver. Here, in the examples, an adhesion improver, which is a solution of an organic compound having a blocked isocyanate group whose end is blocked with various blocking agents, is prepared, and a nylon cord is dipped in this solution, and then RFL or the like. It has been disclosed to apply an adhesive containing a and to embed it in natural rubber. However, as the adhered rubber, only natural rubber that can be easily adhered is considered, and rubber that is a blend of a W-type chloroprene rubber that is difficult to adhere or a diene rubber that is even more difficult to adhere is considered. No, R is the adhesion improver
Blending with a FL adhesive is not considered.

Further, methylene diisocyanate (MD
An RFL adhesive composition obtained by adding an ethylene urea adduct in which I) is adducted with ethyleneimine to an RFL adhesive is a polyester and a styrene-butadiene rubber (SB
It is used for adhesion with R type rubber). However, it is not used for bonding chloroprene rubber to fibers.

Further, although the treatment method varies depending on the fiber to be adhered, when aramid such as Kevlar whose fiber surface is inactive is used as the adhered fiber, usually a two-bath treatment is carried out. Since aramid is inactive, a solution having an epoxy group and an isocyanate compound are used together in one bath to activate the fiber surface, and adhesion is performed in two baths using an RFL adhesive. . However, also in this case, the adhesion between the chloroprene rubber and the fiber is not considered. Furthermore, a solution having an epoxy group, an isocyanate compound, and a blend are used for adhesion of polyester to natural rubber and synthetic rubber other than chloroprene rubber, and are known as DuPont's prescription D417. However, none of them takes into consideration the adhesion between the chloroprene rubber and the fiber, which are difficult to bond, or the rubber blended with the diene rubber, and the fiber.

[0009]

SUMMARY OF THE INVENTION The present invention uses cement to bond the adhesive force between W-type chloroprene rubber and fiber, which are difficult to bond, or a blend of W-type chloroprene rubber and diene rubber, and fiber. It was made to improve without doing. That is, in the present invention, it is an object of the present invention to provide an adhesive composition containing an RFL-based adhesive and an organic compound having a blocked isocyanate group whose end is blocked with various blocking agents in place of conventionally used cement. To aim. Further, the present invention is
Using the above adhesive composition, the fibers to be adhered are dipped in this, water is evaporated in the drying step, and then heat treatment is carried out at a dissociation temperature of the terminal blocking agent plus a temperature of 40 ° C. or less, so that the RFL system is obtained. Resorcin in the adhesive, formalin is resinified, the blocking agent is dissociated by further heat treatment in the vulcanization step, to form a crosslink between the adhesive composition of the present invention and the chloroprene rubber and the fiber It is an object to provide a bonding method for bonding rubber.

That is, the first invention is used for adhering a fiber and a chloroprene rubber containing an RFL adhesive and an organic compound having a blocked isocyanate group in which an isocyanate group end is blocked with an organic compound. It is an adhesive composition. Further, the content of the organic compound having a blocked isocyanate group is preferably 20 to 200 parts by weight based on 100 parts by weight of the solid content of the RFL adhesive. When the content of the organic compound is within this range, the adhesive strength is low when it is less than 20 parts by weight, while
This is because if it exceeds 0 parts by weight, not only the adhesive strength is lowered but also the treated fiber becomes hard. The content of the organic compound is particularly preferably 30 to 100 parts by weight.

A second aspect of the invention is to vulcanize and bond a fiber treated with an organic compound having a blocked isocyanate group having an isocyanate group terminal blocked with a blocking agent and an RFL adhesive to a chloroprene rubber. This is a method of adhering fibers and rubber. Here, in the treatment method, the fiber is dipped in an adhesive composition containing an organic compound having a blocked isocyanate group in which an end of an isocyanate group is blocked with a blocking agent, and an RFL adhesive, and the moisture is added in a drying step. Is vaporized, heat-treated thereafter, and further heat-treated in the vulcanization step to vulcanize and adhere to the chloroprene rubber. In addition, the fiber is preliminarily dipped in an RFL adhesive to evaporate water in the drying step and then heat treated,
An organic compound having a blocked isocyanate group in which the end of the isocyanate group is blocked with a blocking agent, and RF
It is dipped in an adhesive composition containing an L-based adhesive to evaporate water in a drying step, then heat-treated in the same manner as described above, and further in a vulcanization step similar to the above, the fiber and chloroprene treated as described above. It is preferable to vulcanize and bond a system rubber.

Furthermore, after the fibers are dipped in the adhesive composition, water is evaporated in the drying step, and the heat treatment is performed after the heat treatment is performed at a dissociation temperature of the blocking agent plus a temperature of 40 ° C. or less. The fiber and the chloroprene rubber are vulcanized and adhered in the vulcanization step. That is, the fiber is dipped in the RFL adhesive composition containing the organic compound having a blocked isocyanate group, and heat treated for a short time of about 1 to 2 minutes at a dissociation temperature of the blocking agent plus 40 ° C or lower. Then, the resorcin / formalin of the RFL adhesive composition containing the organic compound having a blocked isocyanate group is resinified. Since the heat treatment time is as short as about 1 to 2 minutes, even if the heat treatment is performed at a temperature of the dissociation temperature of the blocking agent plus 40 ° C. or less, the block agent is not all dissociated, but the heat treatment temperature is the same as the above. It is preferably below the dissociation temperature of the blocking agent.

The blocking agent is dissociated by heating in the vulcanization step, and the isocyanate group generated by this is combined with the active hydrogen of the chloroprene rubber to form the organic compound having the blocked isocyanate group of the present invention. A cross-link is formed between the RFL-based adhesive composition containing the above and the chloroprene-based rubber.

The present invention will be described in detail below.

The fiber used for bonding the fiber of the present invention and rubber may be any synthetic fiber, preferably nylon, polyester or the like. In particular, the effect is remarkable when nylon fiber is used.

The rubber used to bond the fiber and rubber of the present invention is a W type chloroprene rubber, and when blended with other synthetic rubber, the effect is remarkable. Examples of the rubber to be blended include diene rubbers such as butadiene rubber (BR), styrene rubber (SR), and styrene-butadiene rubber (SBR). In particular, when chloroprene rubber having a blend ratio of 50/50 with SBR, which is difficult to bond, is bonded to the fiber, the adhesive property is remarkably improved.

The adhesive used in the adhesive composition of the present invention is
It is a so-called RFL type adhesive which is a mixture of resorcin-formalin-latex and is used in an aqueous solution state. As the RFL, it is possible to use a general-purpose product, for example, “Adhesion Handbook Second Edition”, published by Nikkan Kogyo Shimbun Co., Ltd. (published on November 10, 1980), p.648-
Examples include those described on page 649.

Examples of the organic compound having a blocked isocyanate group contained in the adhesive composition of the present invention include MDI whose end is blocked with a blocking agent such as phenol,
Basically, those having an urethane skeleton and containing isocyanate groups whose side chains and terminals are blocked with a blocking agent similar to MDI, and aromatic compounds such as toluene diisocyanate, whose side chains and terminals are similar to MDI And the like can be mentioned. The compound preferably has two or more isocyanate groups, and more preferably has three or more isocyanate groups in the molecule. The amount of the organic compound having a blocked isocyanate group added to the RFL is 2 parts with respect to 100 parts by weight of the solid content of the RFL adhesive.
It is preferably from 0 to 200 parts by weight. The reason why the content of the organic compound is within this range is that if the amount is less than 20 parts by weight, the adhesive force is low, while if it exceeds 200 parts by weight, not only the adhesive force is lowered but also the treated fiber becomes hard. Because. The content of the organic compound is 30 to 1
It is particularly preferable that the amount is 00 parts by weight.

Specific examples of the terminal blocking agent for the isocyanate group which constitutes the organic compound having a blocked isocyanate group include phenol, malonic acid diethyl ester, acetoacetic acid ester, acetylacetone,
Examples thereof include sodium acid sulfite, ε-caprolactam, ethyleneimine, and methylethylketoxime.

Table 1 shows typical end-blocking agents and their dissociation temperatures. These blocking agents differ in the dissociation temperature at which they dissociate from the isocyanate group of the isocyanate compound, so the temperature applied during heat treatment differs depending on what kind of organic compound having a blocked isocyanate group is selected, This results in different thermal stability of the fibers. Next, the blocking agent is dissociated by vulcanization to bond the fiber and rubber. When the fiber is heat-treated at high temperature, the shrinkage during vulcanization is smaller. Therefore, the use of a blocking agent having a high dissociation temperature enables the heat treatment of the fiber at a high temperature, so that the shrinkage of the fiber during vulcanization can be suppressed. Therefore, when a blocking agent having a high dissociation temperature is used, the effect is remarkable.

Table 1 ────────────────────────────── Blocking agent Dissociation temperature (℃) ──────── ────────────────────── Phenol 170-180 Malonic acid diethyl ester 130-140 Acetoacetic acid ester 〜140 Acetylacetone 〜150 Sodium acid sulfite 40〜50 ε-caprolactam 120-160 ───────────────────────────────

In the method for adhering fibers and rubber according to the present invention, the fibers are dipped in an adhesive composition containing the organic compound having a blocked isocyanate group according to the present invention and an RFL adhesive, and moisture is added in a drying step. Is evaporated, and then heat treatment is performed for a short time at a dissociation temperature of the blocking agent of the organic compound having a blocked isocyanate group plus a temperature of 40 ° C. or less. The fibers thus treated are embedded in a chloroprene-based rubber to be integrated, and heated in a vulcanization step to vulcanize for a short time to bond the chloroprene-based rubber and the fibers. As a result, the adhesion between the fiber and the chloroprene rubber is improved. It is considered that this is because the isocyanate group generated by the dissociation of the blocking agent in this vulcanization step reacts with the active hydrogen of the chloroprene rubber and co-crosslinks.

The method for adhering fibers and rubber using the adhesive composition of the present invention includes one-bath treatment and two-bath treatment. First, the one-bath treatment will be described. In one bath treatment,
The fibers are directly immersed in or impregnated with an adhesive composition containing an organic compound having a blocked isocyanate group of the present invention and an RFL adhesive, or the above adhesive composition is applied onto the fibers, and then in a drying step. After evaporating the water,
Heat treatment is carried out for a short time at a dissociation temperature of the blocking agent plus 40 ° C. or less, after which it is bonded to a chloroprene rubber and vulcanized in a vulcanization step to be integrated.

Next, the two bath treatment will be described. In the two-bath treatment, first, as a primary treatment, the fiber is dipped in or impregnated with an RFL adhesive, or the above adhesive is applied onto the fiber, and then the same drying and heat treatment as in the one-bath treatment are performed.
Next, as a two-bath treatment, the fiber after the one-bath treatment is dipped, impregnated, or applied onto the fiber in the adhesive composition of the present invention, and the same drying and heat treatment as the one-bath treatment is performed. To do. The fiber thus obtained is bonded to the chloroprene rubber to be bonded and vulcanized in the vulcanization step to be integrated.

In either one-bath or two-bath treatment, the heat treatment after dipping, impregnating or coating the fibers with the adhesive composition of the present invention and evaporating the main sentence in the drying step, It is necessary not to exceed the dissociation temperature of the blocking agent + 40 ° C. Since the adhesive composition of the present invention is water-based, for example, in the case of a one-bath treatment using a blocking agent having a dissociation temperature of 120 ° C., the fiber treated with the adhesive composition of the present invention is dried at 100 It is necessary to heat-treat at 160 ° C. or lower after evaporating water at 120 ° C. and drying. In the case of the two-bath treatment method, the one-bath treatment is RF
Since only L is required, in this case, for example, RF
The fiber treated with L is dried at 100 to 130 ° C.
To evaporate water to dry, then 120-230 ℃
The heat treatment can be performed to some extent. This is because it is not necessary to consider the dissociation temperature of the blocking agent, and the fiber can be heated to the upper limit temperature at which it can be treated. In order to reduce the shrinkage of the fiber during vulcanization, the heat treatment temperature may be high. Thereafter, the adhesive composition of the present invention is dipped, impregnated with, or applied onto the fibers, which have been subjected to one-bath treatment as described above, and after drying in the drying step, the dissociation temperature of the blocking agent plus 40 ° C. or less. Heat treatment is performed for a short time at the temperature.

Attaching the adhesive composition of the present invention to fibers,
The reason why the heat treatment temperature after drying in the drying step is set to the dissociation temperature of the blocking agent plus 40 ° C. or lower as described above is as follows. When the drying heat treatment temperature exceeds the dissociation temperature of the blocking agent plus 40 ° C., all the blocking agents dissociate from the blocked isocyanate in the heat treatment step. As a result, in the subsequent vulcanization step in which the fiber and the rubber are integrated and vulcanized, a co-crosslinking reaction does not occur between the chloroprene rubber and the isocyanate, and good adhesion cannot be obtained. Therefore, when the fiber is heat-treated, the blocking agent does not completely dissociate from the blocked isocyanate, and at the time of vulcanization of the fiber and the rubber in the vulcanization step, at least a part of the undissociated blocked isocyanate is an adhesive on the fiber surface. This is because it is necessary to treat the layer so that it remains in the layer. Further, the heat treatment at the dissociation temperature of the blocking agent plus 40 ° C. or lower is preferably a short time, specifically about 1 to 2 minutes. If the heat treatment is performed for too long, the blocking agent gradually dissociates, and then, in the vulcanization step of vulcanizing by integrating the fiber and rubber,
This is because a co-crosslinking reaction does not occur between the chloroprene rubber and the isocyanate, and good adhesion cannot be obtained.

The fibers which have been subjected to the above heat treatment are bonded to the chloroprene rubber to be bonded and vulcanized in the vulcanization step to be integrated. Vulcanization may be performed under normal conditions, and the conditions are not particularly limited.

[0028]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these.

Example 1 An RFL adhesive composition containing the following fibers, a chloroprene rubber, and an organic compound having a blocked isocyanate group was used to prepare the following test specimens for peeling test, An RFL adhesive composition containing an organic compound having a blocked isocyanate group of the present invention and a conventional RFL adhesive of Comparative Example or an organic compound having only a blocked isocyanate group are subjected to the following adhesion peeling test. We compared the adhesive strength with. (1) As the fiber used in this example, 66 nylon fiber cord (1890d / 1) was used. (2) The chloroprene rubber used in this example is shown in Table 2
A chloroprene rubber / SBR blend rubber having the composition shown in was used.

Table 2 ───────────────────────────────── Rubber composition parts by weight ──────── ───────────────────────── W type chloroprene rubber 60 Styrene-butadiene-rubber (SBR) 40 Carbon black 50 Process oil 25 Anti-aging agent 2 Oxidation Magnesium 4 Zinc white 5 Accelerator 22 0.5 Sulfur 0.8 Stearic acid 2 ────────────────────────────────── ─

(3) An RFL adhesive composition containing an organic compound having a blocked isocyanate group of the present invention is
The composition shown in Table 3 was prepared and used.

[0032]

[Table 1]

(4) The adhesion test between the fiber and rubber was conducted as follows. After dipping in the adhesive composition shown in Table 3,
In the drying step, water was evaporated at 100 ° C. for 1 minute and heat-treated at the temperature and time shown in Examples 1 to 3 to embed the nylon cords in parallel with the rubber having the composition shown in Table 1.
Vulcanized at 0 ° C. for 45 minutes. Using the test piece thus obtained, the adhesion peeling test between the fiber and the rubber is performed in accordance with the adhesion peeling test of JIS K6301, and the adhesion peeling force (Kgf / 25 mm) is measured and the peeling state is observed. (Rubbing rate) was performed.

(Example 1) As the adhesive composition of the present invention, the adhesive compositions shown in A to E of Table 3 were used, and the above 66 nylon cords were dipped in them and dried at 100 ° C for 1 minute. Then, heat treatment was performed for 2 minutes at 140 ° C., which is 20 ° C. higher than the dissociation temperature of the blocking agent of the blocked isocyanate. The cord obtained here was embedded in rubber as shown in Example 1 (4), and the above-mentioned adhesion peeling test was conducted. The results are shown in Table 4.

Table 4 ────────────────────────────────── Comparative Example 1 Comparative Example 2 Inventive Example 1 bottle Inventive Example 2 Inventive Example 3 ────────────────────────────────── Treatment liquid A E B C D Adhesive strength 4.3 1.5 9.9 6.7 7.0 (Kgf / 25mm) Rubber coverage 10 5 60 30 40 (%) ───────────────────── ────────────────

As shown in Table 4, the adhesive compositions of Examples 1 to 3 of the present invention in which a blocked isocyanate compound was added to RFL showed high adhesive strength. On the other hand, in Comparative Example 2 containing only the blocked isocyanate compound as the adhesive component, the rubber coverage was extremely low. It was revealed that when the mixing ratio of RFL and the blocked isocyanate compound was within the range of the examples of the present invention, the adhesive force and the rubber coverage were high.

Example 2 Each of the adhesive compositions A and B shown in Table 3 was diluted to 1/2 with soft water and adjusted so that the solid content was 5%. The diluted solutions were designated as A ′ and B ′, respectively, and two-bath treatment was performed using them, and the adhesive strength between the one-bath treatment performed in Example 1 and the two-bath treatment performed in Example 2 was compared. The reason why the adhesive was diluted to 1/2 in performing the two-bath treatment is to match the amount of the adhesive adhered to the fibers with the one-bath treatment. Specifically, the above 66 nylon was immersed in the liquid A ′ in advance and then dried at 100 ° C. for 1 minute. After that, heat treatment is performed at 160 ° C. for 1 minute, and then, it is immersed in the liquid B ′ and dried at 100 ° C. for 1 minute.
Heat treatment was performed at 0 ° C. for 1 minute. The nylon cord treated as described above was embedded in rubber in the same manner as in Example 1 (4), and an adhesive peeling test was conducted. From the adhesion peeling test, the result that the adhesion peeling force after the two-bath treatment was 11 kgf / 25 mm and the rubber coverage was 90% was obtained. It is a high value as compared with the results of Examples 1 to 3 of the present invention in which the one-bath treatment was performed only with the solution B of Example 1,
It was shown that the two-bath treatment further improved both the adhesive peeling force and the rubber coverage.

Example 3 The dissociation temperature shown in Table 1 was 150.
Using an adhesive composition F containing a blocked isocyanate compound blocked with a blocking agent at 0 ° C., heat treatment conditions after dipping the nylon cord were changed to prepare a test piece in the same manner as in Example 1, and adhesion was performed. A peel test was performed. The heat treatment after dipping was performed at 100 ° C. for 1 minute, the heat treatment temperature after this was 125 ° C., 150 ° C., 175 ° C., and 200 ° C., and the treatment time was 2 minutes for each. The results are shown in Fig. 1.

As shown in FIG. 1, 200 ° C., which is outside the scope of the present invention and is 40 ° C. or more higher than the dissociation temperature of the blocking agent.
When the heat treatment was carried out at, the adhesive force sharply decreased. On the other hand, at 125 to 175 ° C., which is within the range of the present invention, no sharp decrease in adhesive strength was observed. The sudden decrease in the adhesive force outside the scope of the present invention is considered to be because the blocking agent is dissociated as the heat treatment temperature increases, and the isocyanate group does not act effectively when vulcanized and bonded to the rubber.

[0040]

When the RFL adhesive composition containing the blocked isocyanate group-containing organic compound of the present invention is used, when the fiber and the chloroprene rubber are bonded with this RFL adhesive composition. In the vulcanization step, the blocking agent is dissociated from the organic compound having the blocked isocyanate group contained in the RFL adhesive composition, reacts with the isocyanate group and the active hydrogen of the chloroprene rubber to crosslink, and This improves the adhesion between the fiber and the chloroprene rubber. Further, the blocked isocyanate of the present invention
The RFL-based adhesive composition containing an organic compound having a styrene group is an aqueous solution, and thus the cement using an organic solvent, which has been indispensable for bonding a chloroprene-based rubber and a fiber, becomes unnecessary. This makes it possible to improve safety in handling and avoid adverse effects on the health of the handler. Furthermore, since the step of preparing the cement can be omitted, it is possible to reduce the cost.

[Brief description of drawings]

FIG. 1 is a diagram showing a relationship between a heat treatment temperature and an adhesive force of an adhesive composition of the present invention.

Claims (6)

[Claims] 1. A chloroprene rubber and a fiber containing a resorcin-formalin-latex (RFL) adhesive and an organic compound having a blocked isocyanate group in which the end of the isocyanate group is blocked. An adhesive composition, which is used for adhesion of 2. The adhesive composition according to claim 2, wherein the content of the organic compound having a blocked isocyanate group is 20 to 200 parts by weight based on 100 parts by weight of the solid content of the RFL adhesive. 3. A fiber and a rubber for bonding a fiber treated with an organic compound having a blocked isocyanate group having an isocyanate group terminal blocked with a blocking agent and an RFL adhesive to a chloroprene rubber. Adhesion method. 4. A fiber is dipped in an adhesive composition containing an organic compound having a blocked isocyanate group having an isocyanate group terminal blocked with a blocking agent, and an RFL adhesive, followed by drying and heat treatment, and then a chloroprene-based adhesive. The method for adhering fiber and rubber according to claim 2 or 3, which is vulcanized and adhered to rubber. 5. An adhesive comprising an RFL adhesive and an organic compound having a blocked isocyanate group in which the end of the isocyanate group is blocked with a blocking agent after the fiber is previously dipped in the RFL adhesive and dried and heat treated. The method for adhering fibers and rubber according to claim 5, wherein the fibers and the chloroprene rubber are vulcanized and adhered to each other by immersing the composition in the agent composition, followed by drying and heat treatment. 6. When a fiber is dipped in an adhesive composition containing an organic compound having a blocked isocyanate group and an RFL adhesive and then heat treated for drying, the dissociation temperature of the blocking agent plus a temperature of 40 ° C. or lower. The method for adhering fibers and rubber according to any one of claims 3 to 5, wherein vulcanization adhesion is performed with chloroprene rubber after the dry heat treatment.