JPH058740B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to a lining layer vulcanization method for manufacturing a urethane rubber lined product by lining an adherend with urethane rubber fabric and steam vulcanizing it in a vulcanizer. In the first invention, the adherend surface 2 of the adherend 1 is lined with urethane rubber, and then the release layer 4 is applied to the surface of the urethane rubber.
Further, a waterproof layer 5 is formed on the surface of the release layer 4 to shield the urethane rubber lining layer 3 from the outside, and then the urethane rubber lining layer 3 is formed.
The present invention relates to a method for vulcanizing a lining layer of urethane rubber, which is characterized by vulcanizing the lining layer of urethane rubber, and peeling off the waterproof layer 5 from the release layer 4 after the vulcanization. Conventionally, urethane rubber has been used as a lining material because of its excellent wear resistance. The usual method for lining urethane rubber is to apply urethane rubber adhesive to the adherend, fit the adherend into a mold, fill it with urethane rubber fabric, and then press and heat it.・Lining products were manufactured under pressure. This is the so-called mold vulcanization method. However, lining with this method requires an expensive mold, so it is expensive for objects with complex shapes, slightly different shapes, large objects, single items, etc. could not be applied. Therefore, it would be good if vulcanization could be performed using a method similar to general rubber lining without using a mold, but if the adherend is lined with a urethane rubber fabric sheet and vulcanization is performed in a vulcanization can using high-temperature steam, The following chemical reaction occurs and carbon dioxide gas is generated within the urethane rubber fabric, making it spongy and exhibiting no abrasion resistance at all.
It had no use as a lining material. The chemical reaction between urethane rubber and water is as follows. This reaction is extremely sensitive, and even the slightest amount of water reacts, making the urethane rubber porous, completely eliminating its utility as a wear-resistant product. Therefore, we used an indirect vulcanization method (double kettle vulcanization can) in which high-temperature steam does not come into contact with the urethane rubber. Although high-temperature steam does not come into contact with the urethane rubber fabric, since the vulcanization can is double-layered, , the temperature inside the can rises very slowly, and as a result, the specified temperature
When the temperature rose from 140℃ to around 150℃, the urethane rubber lining layer was already in a state of being vulcanized at low temperatures, resulting in values that were extremely lower than the specified vulcanized rubber properties, making it impossible to put it into practical use. . Furthermore, although there is no direct contact between urethane rubber and high-temperature steam in double-vulcanized cans, the humidity inside the can is the same as that in the atmosphere, and since the humidity inside the can cannot be reduced to zero, urethane rubber As the rubber was heated, the urethane rubber reacted with the moisture inside the can, and the surface of the urethane rubber became finely porous, making it impractical. Another important drawback is that urethane rubber shrinks when it is vulcanized, and this effect cannot be ignored, especially when the adherend is large. The present invention was developed in view of the results of the prior art, and its first objective is to eliminate the need for a mold and to use a vulcanizing can method that uses normal direct steam. The purpose is to provide a method for vulcanizing a lining layer of urethane rubber in which the urethane rubber does not become porous even during vulcanization and has sufficient abrasion resistance. To provide a method for vulcanizing a lining layer of urethane rubber without shrinkage of the lining layer. The outline of the present invention is to cover the surface of the urethane rubber with a different type of elastomer that has a large difference in polarity from the lined urethane rubber and has low water permeation, thereby reducing the permeation of water into the urethane rubber during vulcanization. In addition, the cover lining rubber forming a waterproof layer can be easily peeled off from the surface of the urethane rubber after vulcanization in the vulcanizer, and the lining layer of the urethane rubber can be completely vulcanized. By using a highly hard lining rubber, shrinkage and deformation of the urethane rubber during vulcanization is prevented. An embodiment of the present invention will be described in detail below. After the surface of the adherend 1 is cleaned and treated, the adherend surface 2 of the adherend 1 is lined with urethane rubber in the usual manner, and then urethane is applied to the surface of the urethane rubber. Paints such as acrylic lacquer that have a large difference in polarity from rubber {using a solvent with a solubility index of 8.9 to 9.3 (e.g. toluene, ethyl acetate, benzene, chloroform, methyl ethyl ketone, trichloroethane, etc.) For example, a 10 to 20% solution of thermoplastic resin such as polyvinyl acetate (for example, polymethyl acrylate, polyethyl acrylate, polybutyl acrylate, etc.), cellulose diacetate, dinitrocellulose, etc.
The mold release layer 4 is formed by spraying the mold to a thickness of 100 ml and drying naturally. Next, natural rubber glue is applied to the surface of the release layer 4 to prevent chloroprene penetration, and chloroprene rubber is applied over the entire surface to form the first waterproof layer 5a. The first waterproof layer 5a is not limited to chloroprene rubber, but may also be made of materials having similar properties, such as acrylonitrile butadiene rubber, ethylene propylene rubber, natural rubber, and styrene butadiene rubber. Further, it is desirable to use chloroprene rubber with high hardness (for example, 60 to 70 degrees) in order to prevent the urethane rubber from shrinking during vulcanization.
Next, paste-like silicone rubber (RTV - liquid silicone rubber diluted in toluene) is applied to the surface of the chloroprene rubber for complete waterproofing and left to naturally vulcanize to form a silicone rubber layer. This is referred to as a waterproof layer 5b. Here, the waterproof layer 5 is composed of a chloroprene rubber layer [first waterproof layer 5a] and a silicone rubber layer [second waterproof layer 5b], but since the adherend 1 is large and the thickness of the chloroprene rubber layer is 2～
If the thickness is about 4 mm, the silicone rubber layer can be omitted because complete waterproofing can be achieved with only the chloroprene rubber layer. After the urethane rubber lining layer 3 is completely isolated from the outside in this manner, it is placed in a vulcanizing can, and the temperature of the adherend 1 is rapidly raised with high-temperature steam to vulcanize the urethane rubber. At this time, the urethane rubber tries to shrink, but the highly hard chloroprene rubber prevents it from changing its shape. After sufficient vulcanization, the adherend 1 is removed from the vulcanizing can, left to stand, and then the chloroprene rubber is peeled off.The chloroprene rubber is peeled off cleanly from the release layer 4, and the urethane rubber has the specified vulcanized rubber properties. A lining layer 3 is obtained. As described above, the present invention includes lining the surface of the adherend with urethane rubber, then forming a release layer on the surface of the urethane rubber, and further forming a waterproof layer on the surface of the release layer. Since the urethane rubber lining layer is isolated from the outside, the adherend is stored in a vulcanizing can, and then high-temperature steam is blown into the vulcanizing can to vulcanize the urethane rubber lining layer. The urethane rubber does not come into contact with steam at all, making it possible to obtain a urethane rubber lining layer with specified vulcanized rubber characteristics.Moreover, a release layer is provided, so
The waterproof layer can be easily peeled off from the release layer after vulcanization, and lining can be easily and inexpensively applied to adherends to which conventional urethane rubber lining layers could only be applied by mold vulcanization. In addition, if a highly hard waterproof layer is formed on the surface of the release layer, when the urethane rubber lining layer is vulcanized, the highly hard waterproof layer will prevent the shrinkage of the urethane rubber and prevent the adherend from shrinking. Another advantage is that dimensional changes in the lining layer can be prevented. In this respect, it is particularly effective for large-sized adherends. Example 1 Urethane rubber (formulation A) Blend example Adiprene C...100 (weight) Carbon Sheet S...30 Accelerator DM (dibenzothymazole disulfide)...1.0 Accelerator CZ...3 Activator...0.35 Sulfur... 1.5 2 Rubber paste for compound A (rubber paste for urethane, compound B) Rubber compound A (urethane rubber) fabric with MEK 20
% dissolved. 3 C compound paint (A paint that forms a release layer and prevents the transfer of vulcanizing agents, using the following thermoplastic resins.) Polystyrene, various acrylic resins, polyvinyl acetate, cellulose diacetate. (The solvent is ethyl acetate or methyl ethyl ketone.
10% solution) 4 D compound cover rubber (Example of cover lining rubber forming the first waterproof layer.) <a> Chloroprene rubber Ethobutyl...100 (weight) Anti-aging agent RD...1.0 Zinc white...5.0 Paraffin...2.0 Stearin Acid…1.0 Carbon Sheath SO…56 Carbon Sheath S…25 Process oil…10 <b> Acrylic nitrile butadiene rubber (NBR blend) NBR…100 (weight) Zinc oxide…5 Sulfur…3 Carbon Sheath S…65 DOP (plastic) agent) …15 Stearic acid …1.0 Anti-aging agent RD …0.5 Vulcanization accelerator DM (dibenzothiazole/disaluaide) …1.5 <c> Ethylene propylene rubber (EPDM blend) EPDM …100 (weight) Carbon …60 Aroma oil … 40 Zinc oxide…5 Stearic acid…1 Vulcanization accelerator TRA (dipentamethylene thiuram tetrasulfide)…1.8 PZ (zinc dimethyl dithiocarbamate)…1.5 DM (dibenzothiazole disaluaide)…1.0 Sulfur…1.2 Coumaron indene resin…5.0 Natural rubber Natural rubber…70 (weight) Recycled tire rubber…60 Zinc oxide…4.0 Stearic acid…1.0 Paraffin…1.0 Aroma oil…1.5 Anti-aging agent RD…1.0 Calcium carbonate…60 Carbon…50 Vulcanization accelerator DM (dibenzo Thiazole/disaluride) …1.0 Sulfur …2.5 <e> SBR (styrene butadiene rubber) SBR …90 (weight) Natural rubber …10 Zinc oxide …5.0 Stearic acid …1.0 Paraffin …1.0 Aroma oil …4.0 Calcium carbonate …45 Carbon …65 Anti-aging agent RD …1.0 Vulcanization accelerator DM (dibenzothiazole disaluaide) …0.3 D (diphenylguanidine)
…0.7 Sulfur Yellow …2.5 <f> Chloroprene rubber Chloroprene …100 (weight) Zinc oxide …5.0 Stearic acid …0.5 Paraffin …1.0 Aroma oil …15 Carbon …40 Calcium carbonate …35 Anti-aging agent RD …2.0 Vulcanization accelerator (2. Mercaptoimidazoline)
…1.0 5 D Rubber glue for compounding (E with rubber glue for chloroprene)
It is a combination. ) Toluene dissolved in 20% of rubber fabric of D compound 6 Cover rubber to form the second waterproof layer (Silicone rubber with F compound) RTV - liquid silicone rubber (KE40RTV with 30Phr of toluene added to form a paste) 7 Primer for adherend Undercoat (Chemrock 205) Topcoat (Chemrock 220) 8 Test method Abrade the surface of the metal adherend to be lined with sandblasting, grit or shot blasting, Next, apply one coat of primer undercoat (Chemrock 205), let it dry naturally, and then apply one coat of primer topcoat (Chemrock 220).
Apply once and let dry naturally. After the primer is completely dry, apply urethane rubber glue (compound B) twice on the primer and let it air dry. Next, the urethane rubber fabric (formulation A) is formed to a specified thickness using a calender or extruder, and then cut to match the surface of the adherend, and urethane rubber glue is applied to the adhesive surface of the urethane rubber fabric. Apply urethane rubber glue (B combination) twice and let it air dry. Next, apply urethane rubber glue (B combination) once each on the adhering surface and the adhesion surface of the urethane rubber fabric sheet, and it is optimal when dry to the touch. When the adhesiveness is reached, lining construction is carried out under the same conditions as the normal lining method. After this lining construction, let it dry naturally for about 1 hour in summer and about 2 hours in winter, and then spray C compound paint evenly over the entire surface of the urethane rubber once to form a release layer. Form. After the paint has dried, apply rubber paste for compound D (glue for compound E) twice on its surface and let it dry. Next, cut the D compound cover rubber fabric sheet to match the dimensions of the lining urethane rubber, apply rubber paste for compound D (rubber paste of compound E) twice on its surface, let it dry naturally, and then apply Rubber glue for D compound (E
Apply the compounded rubber paste once each, and when it is dry to the touch and the adhesiveness is at its optimum level, apply the cover rubber lining for the first waterproof layer under the same conditions as for general lining. Next, after the main lining is finished, after naturally drying for 4 hours in summer and 6 hours in winter, apply F-blended glue once on the surface of the cover rubber that forms the first waterproof layer so that it is as even as possible. After coating, leave for 24 hours to air dry, and after the F-compound paste has completely dried naturally, put the lining product into a steam vulcanization can and vulcanize it.
When removed from the vulcanizing can and allowed to stand for a while, when peeled off from the D compound cover rubber, the C compound paint that makes up the release layer adhered to the D compound cover rubber and peeled off, leaving the urethane rubber completely cured. This results in sulfurization. In addition, the cover rubber that forms the first waterproof layer
When using NBR, the glue used is 20 weight of chloroprene rubber dissolved in 80 weight of triol. Also, when using EPDM, the glue is
A mixture of 20 weight of dough rubber, which is a mixture of chloroprene rubber and EPDM at a weight ratio of 1:1, is dissolved in 80 weight of triol. When using natural rubber, the glue used is 20 weight of natural rubber fabric dissolved in 80 weight of triol. When using SBR, the glue used is 20 weight of SBR fabric dissolved in 80 weight of triol. When using chloroprene, the glue used is 20 weight of chloroprene fabric dissolved in 80 weight of triol. 【table】

[Brief explanation of the drawing]

The figure is a sectional view of an embodiment of the present invention, in which 1 is an adherend, 2 is an adherend surface, 3 is a lining layer of urethane rubber, 4 is a release layer, and 5 is a waterproof layer.

Claims (1)

[Claims] 1. Lining the surface of the adherend with urethane rubber, then forming a release layer on the surface of the urethane rubber, further forming a waterproof layer on the surface of the release layer, and applying the urethane rubber lining layer to the outside. 1. A method for vulcanizing a lining layer of urethane rubber, the method comprising: blocking the lining layer from the urethane rubber, then vulcanizing the lining layer of urethane rubber, and peeling off the waterproof layer from the release layer after vulcanization.