JP3305543B2 - Method for producing bituminous fibrous joint plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a bituminous fibrous joint plate used for joint treatment of a concrete structure.

[0002]

2. Description of the Related Art Conventionally, bitumen boards and bitumen have been used to prevent rainwater and foreign matter from entering the joints of concrete pavements and other concrete structures such as roads and parking lots and to ensure the flatness of construction sites. Joint materials such as a fibrous plate and a foam joint plate are used. In these joint materials, the bitumen plate is formed by heating and kneading petroleum asphalt and a filler into a plate shape and covering the front and back surfaces with asphalt paper, and is commercially available under the trade name of elastite. Bituminous fibrous boards are obtained by impregnating bituminous substances such as asphalt or cutback asphalt into the fiberboard, or coating the front and back surfaces of the fiberboard.The foam joint board is made by foaming resin or rubber. It becomes.

[0003]

However, bitumen sheets have a problem that the bitumen material is softened with an increase in temperature, and when used as a joint board, the bitumen spills out onto the pavement surface and the restoration rate after compression is small. There is a point. Bituminous fibrous boards are light and easy to handle, but when impregnating bituminous substances such as asphalt into the fiberboard, the impregnation can be accelerated by reducing the pressure in the impregnation tank or by hot pressing at around 160 ° C. It is necessary to perform a process such as heat-pressure treatment for 15 minutes to accelerate the impregnation, and it takes a lot of time to impregnate the core, and thus the productivity is reduced.
This impregnation time can be shortened by impregnating the fiber with a relatively large amount of bituminous material in advance, but the increased amount of bituminous material not only increases the product cost but also increases the weight. As a result, problems such as handleability arise. Further, in the case of a foam joint board, there is a problem that the material is poor in rigidity and workability is poor.

[0004] The present invention has been made in view of such a problem, and it is an object of the present invention to reduce the amount of bitumen material impregnated in spite of impregnating the bitumen material into the core of a soft fiberboard. In addition to reducing the product cost, improve the handling and workability by reducing the weight, and also improve the cutability with the cutter and improve the workability by reducing the impregnation amount of the bituminous substance that is sticky. It is an object of the present invention to provide a method capable of efficiently producing a bituminous fibrous joint plate in a short time.

[0005]

In order to achieve the above object, a method for producing a bituminous fibrous joint plate of the present invention comprises impregnating a soft fibrous plate with a heated and melted bituminous material, and then impregnating the bituminous material impregnated fiber. The plate is heat-treated at a temperature of 170 ° C to 200 ° C. In this method, the bituminous material is heated and melted at 160 ° C to 190 ° C,
Preheat to normal temperature or 50 ℃ ~ 90 ℃ in this bituminous material
The treated soft fiber board is impregnated for several seconds by dip pickling.
Sense the bituminous material in the surface layer of the soft fibreboard and 1.9kg / m ² ~2.
It is to be attached and impregnated so as to have an impregnation amount of 8 kg / m ² .

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The base material to be impregnated with bituminous material is preferably a soft fiber board having a specific gravity of 0.20 to 0.30, which is formed by entanglement of wood fibers without adding a binder. Used. As a method for impregnating the bitumen substance into the soft fiber board, a method of doppling the soft fiber board in an impregnation tank of a bituminous substance that is being heated and melted is used .
In order to reduce the amount of bituminous material to be impregnated into the soft fiberboard, the impregnation time was shortened, and the bitumen material was fixed and retained on the surface layer without impregnating the bitumen material up to the core of the soft fiberboard. And

As a bituminous substance to be impregnated into a soft fiber board, straight asphalt having a penetration of 150 to 200 (12
Straight asphalt: paraffin wax = 9 with a blending ratio of a viscosity of about 450 centistokes at 0 ° C. and a paraffin wax (having an oil content of about 2% by weight and a viscosity at 100 ° C. of about 5 centistokes). : 1
A mixture uniformly mixed within the range of 7: 3 is used. The amount of bituminous material impregnated on the soft fiber board is to impregnate the surface layer without impregnating the core as described above in view of weight reduction and workability, etc., and the impregnation amount is 1.9 kg / m ^{2 to} 2.8. kg/
an amount in the range of m ^2.

[0008] As a means of impregnating bitumen material soft fiberboard so that such impregnation amount, the method according to Dov soaked in the impregnation vessel is suitable. At this time, it is necessary to set the temperature of the bituminous material, the impregnation time, and the temperature of the soft fiberboard.

The setting is to increase the temperature of the bituminous material from 160 ° C to 190 ° C.
C., preferably 180.degree. C., and when the asphalt: paraffin wax compounding ratio is 9: 1,
The impregnation time of about 10 to 40 seconds is required. However, when the impregnation processing is required in a shorter time, the soft fiber board is preheated in advance. That is, if the soft fiber board is heated to 50 to 90 ° C. so that its moisture content is almost completely dry, the heated soft fiber board is impregnated with a bituminous substance so as to have an impregnation amount within the above range. Processing time may be several seconds.

When the mixing ratio of straight asphalt: paraffin wax is 7: 3, when the bituminous material is impregnated at a temperature in the range of 160 ° C. to 190 ° C., preferably 180 ° C., as described above, the softness of the bitumen material becomes soft. If the fiberboard is preheated to a high temperature of 50-90 ° C, the viscosity of the bituminous material decreases and the amount of bituminous material adhering to and impregnating on the soft fiberboard becomes unnecessarily large. Is to be impregnated at room temperature (15 ° C to 25 ° C) as an air-dried state.
Depending on the processing conditions, the amount of bituminous material within the above range can be adhered to and impregnated on the soft fiberboard in a processing time of several seconds.

Further, when the soft fiberboard is soaked in the impregnation tank, the impregnation amount and the treatment time vary depending on the liquid pressure of the molten bituminous material.
Impregnate at about 10-15 cm. If the set temperature of the bitumen substance in the impregnation tank is extremely low, the viscosity inherent in the bitumen substance appears, making it difficult to adjust and control the amount of adhesion and impregnation. When set to, it is not preferable because a part of the bituminous material evaporates to generate an organic gas which may cause harm to the body. Therefore, as described above, the range of 160 ° C to 190 ° C, preferably 180 ° C is preferable. It is to be impregnated.

In this way, the bitumen substance is applied to the soft fiber board in a set amount, adhered and impregnated, and then heat-treated by a post-heating treatment method to sufficiently and uniformly reach the core, which is the unimpregnated portion of the bitumen substance, in a short time. It infiltrates and impregnates bituminous substances. As such a post-heating treatment method, a method using a dryer using parallel circulation hot air, a dryer using vertical strong hot air, a dryer using vertical ventilation hot air / steam, an autoclave, or other heating equipment Is adopted.

[0013] When the above-mentioned soft fiber board to which the bituminous substance is attached and impregnated is subjected to post-heating treatment using these heating equipment, the bitumen substance attached to and impregnated on the surface layer of the soft fiberboard becomes soft. It permeates and impregnates into the deep part of the fiberboard in a relatively short time. That is, when heated, the viscosity of the bituminous material decreases, and the bituminous material becomes fluidized, and the above-mentioned 1.9 kg / m ^{2 to} 2.8 kg /
deposited with impregnation of m ^2, as bituminous material which has been impregnated is spread and penetrate into the core portion through the gaps between the fibers of the soft fiber board, without completely filling all voids portion The soft fiber board is uniformly impregnated from the surface layer to the core with a predetermined proportion of voids remaining, and a bituminous fiber joint board with a small amount of impregnation can be manufactured in a short time.

[0014] In the above post-heating treatment method, the higher the treatment temperature is, the more advantageous the treatment temperature is in promoting the impregnation of the bituminous substance, even if the treatment is carried out using any post-heating treatment equipment. When treated, there is a risk of generating organic gas from bituminous substances and causing thermal deterioration of the soft fiber board itself,
The range of the post-heating temperature is 170 ° C to 200 ° C, preferably 18 ° C.
It is set to about 0 ° C.

In the above-mentioned post-heating method, it is necessary to supply heat more effectively in order to quickly penetrate and impregnate the bituminous substance into the core of the soft fiberboard. It is preferable to use a high-temperature steam and a heat medium such as a high-temperature pressure and a heating device to minimize heat loss, but all such heat supply means require enormous costs for capital investment. The problem is that the product cost is high. Therefore, by using a parallel circulation type hot air dryer which requires the least capital investment cost, the bitumen fibrous joint plate is manufactured at low cost by post-heating treatment in a relatively short time.

The bitumen fibrous joint plate thus heat-treated is cooled by standing or forcedly cooled. The obtained bituminous fibrous joint plate has a low specific gravity (SG 0.40-0.50) despite the fact that bitumen material is uniformly impregnated to the deep part,
It has good cutting properties and workability by a cutter and can be suitably used as a joint material. Next, specific examples and comparative examples of the present invention will be described.

[0017]

EXAMPLES (Example 1) A soft fiber board having a specific gravity of 0.22 and a thickness of 10 mm is inserted into a parallel circulation hot air drier and subjected to a preheating treatment at 100 ° C for 30 minutes. The moisture content of the soft fiber board taken out of the dryer is almost completely dry, and the temperature is heated to about 90 ° C. This heated soft fiber board is impregnated in a bitumen material impregnation tank and impregnated. Bituminous substances to be impregnated into the soft fiber board include straight asphalt having a penetration of 150 to 200,
A paraffin wax having an oil content of about 2% by weight and a viscosity at 100 ° C. of about 5 centistokes in a mixing ratio of 9: 1,
It is homogeneously mixed and heated and melted at 180 ° C. Place the soft fiber board in the bitumen material impregnation tank for 2 to 10 seconds
~ 25 ° C, moisture content 4 ~ 12% for soft fiberboard, 10 ~
When immersed in dough for 40 seconds, 2.7 ±
Bitumen material in an amount of 0.1 kg / m ² is impregnated. At that time, the unimpregnated thickness of the core is about 3 to 4 mm. Immediately after the impregnation, the soft fiber board is fed into a parallel circulation hot air dryer, and is heated at a drying temperature of 180 ° C., a wind speed of 1 m / sec for drying, and a drying time of 30 minutes. At this point, the unimpregnated portion of the core is completely impregnated. The bituminous fibrous joint plate thus obtained had a weight of about 5.0 kg / m ² , and was light in weight without impairing the required quality as a joint plate and had good cutter cutting properties.

Example 2 The procedure is the same as that of Example 1 until a soft fiber board having a specific gravity of 0.22 and a thickness of 10 mm is impregnated with a bitumen substance by dipping into a soft fiber plate.
Immediately after this impregnation treatment, the soft fiber plates are placed in parallel on a wire mesh conveyor in parallel, and from 190 ° C to 20 ° C from above and below the conveyor.
When heated by blowing a vertical strong hot air at 0 ° C. for 20 to 30 minutes, a bitumen fibrous joint board in which the bitumen substance was uniformly impregnated into the core was obtained.

Example 3 As in Example 1, a soft fiber plate was impregnated with a bituminous substance by dipping, and the soft fiber plate contained steam.
Heat treatment was performed by blowing hot air at a temperature of 0 ° C to 200 ° C. According to this heat treatment, the viscosity of the bituminous substance can be reduced more quickly than that of hot air of the same temperature that does not contain the steam, and the bituminous substance can be reduced by the steam pressure because the steam contains the steam having a larger heat capacity than the air. Is penetrated and impregnated at once from the surface layer of the soft fiber board to the core,
With a short heat treatment time of about 20 minutes, a bituminous fibrous joint plate having a light weight and good cutter cutting properties was obtained without impairing the required quality as a joint plate.

(Example 4) As in Example 1, a soft fiber plate is impregnated with a bituminous substance by dipping, and then the soft fiber plate is put in an autoclave and subjected to a high temperature and high pressure treatment at 150 ° C to 180 ° C. After doing
In 10 to 20 minutes, a bitumen fibrous joint plate in which the bitumen substance was uniformly impregnated up to the core was obtained.

Comparative Example A soft fiber board having a specific gravity of 0.22 and a thickness of 10 mm was placed in the same bitumen substance impregnating tank as in the above example for 2 to 10 seconds, or 10 to 40 seconds when no preheating treatment was performed. Alternatively, in a mixing ratio of straight asphalt: paraffin wax = 7: 3, after pre-soaking for several seconds without preheating treatment, 100
The impregnation was promoted by inserting and curing in a parallel circulation hot-air dryer at ℃. The impregnation time at this time is 24
It took about an hour, and it took a long time to produce a bituminous fibrous joint plate.

[0022]

As described above, according to the method for producing a bituminous fibrous joint plate of the present invention, the temperature is reduced to room temperature or a temperature of 50 to 90 ° C.
Heat-treated soft fiberboard is heated and melted at 160-190 ° C.
Impregnate for several seconds by dipping in molten bituminous material
Bituminous materials in the surface layer of the soft fibreboard Te to 1.9kg / m ² ~2.8kg /
deposited so that the amount of impregnation m ^2, impregnated, after accordingly,
The fiberboard impregnated with bituminous material is heated at a temperature of 170 ° C to 200 ° C.
By heat treatment to impregnate the surface layer
Since the bituminous substance penetrates into the core of the soft fiberboard, the amount of bituminous substance impregnated can be reduced and the weight can be reduced, so that the handling property during transportation and construction can be improved. Can be done, and 170-200
The post-heat treatment at ℃ enables the bitumen substance in the surface layer to be uniformly impregnated into the core of the fiberboard in a short time, and the bitumen fibrous joint plate can be manufactured efficiently and inexpensively, and is suitable for mass production. is there.

Further, since the bitumen material impregnated into the surface layer of the fiberboard is infiltrated and impregnated so as to diffuse into the interior, a small amount of bituminous material is impregnated into the entire fiberboard. It is possible to obtain a bituminous fibrous base plate having excellent workability in which voids remain between fibers so that the resilience of the fiber plate itself can be exhibited and the cutability by the cutter is good.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) D21J 1/00-1/20 E04B 1/68

Claims (1)

(57) [Claims] (1) Preheating to room temperature or a temperature of 50 ° C to 90 ° C.
The treated soft fiberboard is impregnated in a bitumen material heated and melted at 160 ° C. to 190 ° C. for several seconds by dipping into the soft fiber board to soften the soft fiberboard.
Containing bitumen material in the surface layer of 1.9kg / m ² ~2.8kg / m ² of Density Fiberboard
Deposited so that the Hitaryou, impregnated, after accordingly, by heating with the bitumen-impregnated fiber board at a temperature of 170 ° C. to 200 DEG ° C., the bituminous product is impregnated in the surface portion
A method for producing a bituminous fibrous joint plate, characterized by infiltrating into the core of a soft fibreboard .