JP2000119637A - Adhesive sealing material composition and sealing method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive sealing material composition exhibiting excellent watertightness and excellent in a releasability, and also provide a sealing method using the composition. SOLUTION: The objective adhesive sealing material composition comprises the following components: (A) 100 pts.wt. of a block copolymer comprising a polystyrene and a polyolefin; (B) 50-300 pts.wt. of a tackifier; (C) 50-400 pts.wt. of an inorganic filler; (D) 5-20 pts.wt. of an anti-foaming agent; and (E) 100-700 pts.wt. of a softening agent. The objective sealing method comprises direct, thermal application of the adhesive sealing material composition on a member to be sealed to form a sealing material, or attachment, to a member to be sealed, of a previously formed product obtained by discharging the adhesive sealing material composition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive sealing material composition and a sealing method using the sealing material composition, and more particularly to an adhesive used in a gap between a rear combination lamp of an automobile and an automobile body panel. The adhesive sealant composition and the sealant composition that have water tightness under the market environment conditions used and have workability at the time of lamp removal at the time of repair or disassembly, and can be peeled off at the interface destruction state. It relates to the sealing method used.

[0002]

2. Description of the Related Art Conventionally, for example, in a trimming process in an automobile assembling process, an operation of assembling a rear combination lamp to an automobile body which has been painted is performed. In this case, a gap between the rear combination lamp and the automobile body is formed. Various sealing materials are used for the purpose of watertightness, and a molded gasket obtained by punching a rubber independent foam sheet or a butyl rubber-based adhesive material which is heated and applied at 100 ° C. or higher is often used.

[0003] A molded gasket, which is punched out in advance in accordance with a desired watertight portion shape provided on the housing case side of the rear combination lamp, is used by being assembled to the housing case side of the rear combination lamp. Such a molded gasket secures watertightness by utilizing a repulsive elastic force generated by compression of a fastening point (screw) provided on the housing case side with the vehicle body (during press-fitting).

[0004] Such a conventional molded gasket is usually a sheet of an independently foamed product whose volume ratio is made three to five times by using a rubber (EPDM: copolymer of ethylene, propylene and diene) urethane resin, silicon resin or the like. Is often punched out beforehand with a metal mold, Thomson blade or the like. In this case, in order to obtain a repulsive elastic force necessary for ensuring watertightness, when the rear combination lamp is assembled, it is used by being compressed by 25 to 50% in the thickness direction of the molded product.

[0005] However, under the market environment conditions in which automobiles are used, molded articles used in a compressed state are permanently compressed due to deterioration due to heat and humidity over time,
Accordingly, the rebound resilience is relatively reduced, and the watertightness becomes poor. For example, a phenomenon that water enters the trunk room of the automobile may occur. Further, such a molded gasket is applied to a plurality of steps of about 1 mm of the vehicle body side panel in a watertight seal portion, for example, a portion of a vinyl chloride sealing material which is applied to a zero-juggle joint portion of a rear fender panel and a rear panel and modified with a brush. In many cases, the rear combination lamp is not installed sufficiently in the vehicle body structure having such a structure, and the watertightness becomes poor immediately after that, for example, water enters the trunk room of the automobile. Has become a problem.

The butyl rubber-based pressure-sensitive adhesive is used by applying heat at a temperature of 100 ° C. or more in accordance with the shape of a desired watertight portion provided on the housing case side of the rear combination lamp. Such a butyl rubber-based adhesive is
In the gap between the rear combination lamp and the car body, instead of the repulsive elastic force in the direction of the plane generated during compression as in the case of a molded gasket, a strong adhesive force between the resin surface on the housing case side of the rear combination lamp and the painted surface of the car body Is used to ensure watertightness.

[0007] The conventional butyl rubber-based pressure-sensitive adhesive generally has a rib shape (groove shape) provided on the housing case side of the rear combination lamp at a temperature of 100 ° C or more.
In accordance with the above, a bead having a cross-sectional diameter of 8 to 12 mm is applied by heating, and a watertightness in an interface region is obtained by a strong viscous adhesive force between a resin surface on a housing case side of the rear combination lamp and a painted surface of a vehicle body.

In general, a butyl rubber-based pressure-sensitive adhesive has a property of relieving stress immediately after compression, so that no rebound resilience acts.
Therefore, unlike the molded gasket, the butyl rubber-based adhesive decomposes due to heat and humidity over time in the gap between the rear combination lamp and the car body panel under the market environment conditions in which the car is used. It is not permanently compressed in its thickness direction. In addition, since the stress is immediately relaxed immediately after the compression as described above, the watertight seal portion has sufficient followability to a plurality of steps of about 1 mm of the vehicle body side panel, and there is a particular problem in the watertight reliability over time. Does not occur.

However, the butyl rubber-based adhesive is hardened by an industrial dryer or the like due to its strong adhesive strength when replacing the rear combination lamp at an automobile service factory for repair or replacement of the rear combination lamp. It is necessary to pry open the seal portion of the rear combination lamp with a plastic bar or the like and remove it from the vehicle body panel while gradually heating the adhesive portion, which is very complicated.

The butyl rubber-based adhesive material is broken (cohesive failure) while remaining and adhered to the vehicle body panel surface and the rear combination lamp housing surface when the lamp is removed. Therefore, the rear combination coated with a new butyl rubber-based adhesive material is used. When reassembling the lamp, it is necessary to manually remove the butyl rubber-based adhesive containing a large amount of sand dust, dust and oil remaining on the body panel side in order to ensure watertightness after assembly. It takes a lot of time and effort. In addition, butyl rubber-based adhesive adhered to the hands of the workers can be
In some cases, it may re-adhere to the interior trim material, resulting in poor appearance after completion of the replacement work.

Further, when dismantling or scrapping a car, a butyl rubber-based adhesive is attached deep inside the groove shape on the housing case side of the rear combination lamp mainly made of polypropylene resin or the like, and the attached butyl rubber-based adhesive is removed. Since it is extremely difficult to perform this, it is practically difficult to recover and recycle the resin material used for the rear combination lamp housing case.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to provide a pressure-sensitive adhesive composition having excellent watertightness and excellent peelability, and a sealing method using the composition.

In particular, it is preferably used between a rear combination lamp for an automobile and a gap between a vehicle body panel, has excellent watertightness, is easy to remove the rear combination lamp from the vehicle body panel, and has a body panel surface and a rear combination lamp housing. The present invention relates to an adhesive sealant composition that does not remain on a surface and a sealing method using the composition.

[0014]

Means for Solving the Problems As a result of research conducted to solve the above problems, the present inventors have found that the use of an adhesive sealing material composition composed of specific components and a special sealing method have led to the above problems. And found the present invention.

That is, the adhesive sealing material composition according to the first aspect comprises the following components: (A) 100 parts by weight of a block copolymer composed of polystyrene and polyolefin; (B) 50 to 300 parts by weight of a tackifier; Inorganic filler: 50 to 400 parts by weight (D) Antifoaming agent: 5 to 20 parts by weight (E) Softener: 100 to 700 parts by weight

According to a second aspect of the present invention, there is provided an adhesive sealing material composition according to the first aspect, wherein (A) the block copolymer comprising polystyrene and polyolefin has a molecular weight of 50,000 to 300,000. Styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-propylene-styrene block copolymer (SEPS) and styrene At least one selected from the group consisting of ethylene-butadiene-styrene block copolymer (SEBS), and (B) the adhesive agent is an aliphatic saturated hydrocarbon resin, a hydrogenated terpene resin, a terpene resin, an aromatic modified terpene resin , Aliphatic petroleum resin, hydrogenated rosin Is at least one selected from the group consisting of aromatic resins and styrenic resins,
(C) The inorganic filler is at least one selected from the group consisting of calcium carbonate, aluminum silicate, talc, silica, diatomaceous earth, aluminum sulfate, barium sulfate, calcium sulfate and carbon black, and (D) an antifoaming agent Is at least one selected from the group consisting of calcium oxide, magnesium oxide and molecular sieve, and (E) the softening agent is selected from the group consisting of paraffinic process oil, naphthenic process oil, olefinic process oil and polybutene. It is characterized by being at least one selected from.

The sealant composition according to claim 3 is the sealant composition according to claim 1 or 2, wherein the 180 ° peel strength at 23 ° C. of the member to be sealed is 10 to 50 N / 25 mm. There is a feature.

According to a fourth aspect of the present invention, there is provided a sealing method.
3. The adhesive sealant composition according to any one of (3)
The material to be sealed is directly heated and applied as a sealing material, or the adhesive sealing material composition is discharged and molded in advance and used as a sealing material for a material to be soleed. It is characterized by the following.

The sealing method according to a fifth aspect is characterized in that, in the sealing method according to the fourth aspect, the adhesive sealing material composition is applied or discharged in a bead shape.

A sealing method according to a sixth aspect is characterized in that, in the sealing method according to the fifth aspect, the sealing material is used by being compressed to 0 to 80% of the bead-shaped cross-sectional height.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The adhesive sealing material composition of the present invention comprises the following components (A) 100 parts by weight of a block copolymer comprising polystyrene and polyolefin (B) 50 to 300 parts by weight of a tackifier (C) Inorganic filler 50 to 400 parts by weight (D) Antifoaming agent 5 to 20 parts by weight (E) Softener 100 to 700 parts by weight

The component (A) includes styrene / isoprene / styrene block copolymer (SIS) and styrene / butadiene / styrene block copolymer (SB).
S), styrene-ethylene-propylene-styrene block copolymer (SEPS) and styrene-ethylene
Butadiene / styrene block copolymer (SEBS)
At least one block copolymer selected from the group consisting of:

The molecular weight is preferably from 50,000 to 300,000. Within such a range, the heating application operation and the desorption become easy. If it is less than 50,000, the cohesive strength is reduced and desorption becomes difficult, and if it exceeds 300,000, the heat coating operation becomes difficult.

Further, the styrene content in the block copolymer is preferably from 10 to 50% by weight. Within such a range, appropriate cohesive strength and elongation can be obtained. If it is less than 10% by weight, the cohesive force is reduced and desorption becomes difficult. If it is more than 50% by weight, its elongation is reduced and the stress at the time of compression is increased,
The assembling work of the lya combination lamp becomes difficult.

Particularly preferably, SEPS and SEBS are used in view of heat resistance and weather resistance of the composition.

The component (B) includes aliphatic saturated hydrocarbon resin, hydrogenated terpene resin, terpene resin, aromatic modified terpene resin, aliphatic petroleum resin, hydrogenated rosin ester, aromatic resin and styrene resin. At least one tackifier selected from the group consisting of resins and the like can be used. Particularly preferably, an aliphatic saturated hydrocarbon resin is used from the viewpoint of compatibility with the component (A) and the effect of giving tackiness. Further, the melting point of the tackifier is preferably 80 to 1 from the viewpoint of securing workability by heating and securing rebound resilience of the composition.
50 ° C. is preferred.

The component (B) is the component (A) 10
It is contained in an amount of 50 to 400 parts by weight based on 0 parts by weight. Within this range, sufficient adhesiveness and shape retention during ejection become easy. If the amount is less than 50 parts by weight, it is difficult to secure the tackiness, and if the amount is more than 400 parts by weight, it becomes difficult to maintain the shape at the time of discharge by heating.

The component (C) includes calcium carbonate, aluminum silicate (clay), talc, silica, diatomaceous earth,
At least one selected from the group consisting of aluminum sulfate, barium sulfate, calcium sulfate, and carbon black
Different inorganic fillers can be used. Further, for the purpose of reducing the specific gravity and reducing the weight, a lightweight hollow filler such as a glass balloon or a shirasu balloon may be used in combination.

The component (C) comprises the component (A) 10
It is contained in an amount of 50 to 400 parts by weight based on 0 parts by weight. Within this range, it is possible to maintain the shape at the time of heating and discharging, and secure the adhesive strength and cohesive strength. If the amount is less than 50 parts by weight, it is difficult to maintain the shape during ejection, and if it is more than 400 parts by weight, it is difficult to secure the adhesive force and the cohesive force.

As the component (D), at least one foaming inhibitor selected from the group consisting of calcium oxide, magnesium oxide and molecular sieve can be used. The content is 5 to 20 parts by weight based on 100 parts by weight of the component (A). Within this range,
An effect of preventing foaming due to moisture absorption is obtained. If the amount is less than 5 parts by weight, the effect is small, and if the amount is more than 20 parts by weight, the foaming preventing effect is not so much improved and the adhesion may be inhibited.

As the component (E), at least one softening agent selected from the group consisting of paraffin-based process oil, naphthene-based process oil, olefin-process oil and polybutene can be used. Particularly preferably, a paraffin-based process oil is used from the viewpoint of compatibility with the component (A) and heat resistance. Its content is
It is 100 to 700 parts by weight based on 100 parts by weight of the component (A). Within this range, sufficient heating / discharging workability and desorption properties can be obtained. If the amount is less than 100 parts by weight, the discharging operation becomes difficult. If the amount exceeds 700 parts by weight, the cohesive force is weakened, and the desorption becomes difficult.

Further, in addition to the above components (A), (B), (C), (D) and (E), an anti-aging agent, a softening agent and Additives such as fuel materials can also be added. The amount is preferably 0 to 5% by weight in the adhesive sealing material composition from the viewpoint of cost and performance of the composition.

As the antioxidant, naphthylamine, p-phenylenediamine, quinoline, phenol and the like can be used. The content thereof is preferably 0 to 5 parts by weight based on 100 parts by weight of the component (A). Within such a range, the antioxidant effect of the composition can be obtained. If the amount exceeds 5 parts by weight, the basic performance of the composition will be impaired, and the cost will increase.

Further, the adhesive sealing material composition of the present invention is applied to a member to be sealed at 180 ° C at 23 ° C.
The peel strength is preferably 10 to 50 N / 25 mm. Within this range, the watertightness and the detachability can be ensured. The peel strength was determined by applying a composition to a coated steel sheet, and then attaching a non-stretchable material such as a PET film from above, grasping the PER film, and peeling at 180 ° C. With tensile strength of 200mm
/ Min.

The adhesive sealing material composition of the present invention comprises the above components (A), (B) and (C), and if necessary, additives such as a filler and an antioxidant. Can be prepared by putting the mixture into a kneader set near the temperature at which is melted and thoroughly mixing.

As the kneader, for example, a Banbury mixer equipped with a heating device and a defoaming device, a pressure kneader, a Henschel mixer, a Brabender type kneader, a disper, or the like can be used. Stir until the ingredients are melt mixed and uniform. The adhesive sealing material composition thus obtained is filled and stored in a pail or drum.

The sealing method using the thus obtained adhesive sealing material composition of the present invention as a sealing material will be described below. Hereinafter, the member to be sealed is not particularly limited, but a preferred example is a rear combination lamp housing of an automobile, an automobile body panel, and the like.

First, the adhesive sealing material composition of the present invention is automatically or in a bead state having a sectional diameter of 8 to 12 mm in accordance with the position of the rib groove provided on the rear combination lamp housing side of the automobile. Manually apply heat. At this time, the adhesive sealing material composition of the present invention filled in a pail can or a drum can is, for example, a heating coating apparatus generally called a bulk melter, specifically, a casing plate portion of which is 100 ° C. or more, preferably about 1 ° C.
Heated to 50 ° C, only the adhesive sealing material directly under the casing plate is melted, and automatically or manually heated and applied to the rear combination lamp housing surface of the automobile by an application device sucked up by a constant flow gear pump or the like. .

In general, the adhesive sealing material composition is often heated and applied in a bead shape to a member to be sealed such as a rear combination lamp housing surface, but if necessary, if water tightness can be ensured. By changing the shape of the nozzle tip, it may be applied to an elliptical shape, a triangular bead shape, or other irregular (left-right asymmetric) cross-sectional shapes. The applied cross-sectional shape of the adhesive sealing material composition is not particularly limited. Absent.

When a bead shape having a larger cross-sectional diameter or a bead shape having a larger cross-sectional height is formed by heating and applying to a member to be sealed such as the rear combination lamp housing surface, the tip diameter of the discharge nozzle is preferably increased. In addition to the method of increasing the size, a coating (overcoating) may be further performed on a bead shape or an elliptical shape once heated and applied.

The adhesive sealing material composition applied to the rear combination lamp housing surface by heating is connected by a starting point and an end point of the bead shape to form a loop shape on the housing case. In this case, the adhesive sealing material composition applied at 100 ° C. or higher is melted and mixed with the adhesive sealing material at the bead application start point and the application end point at the end of application, unless cooled rapidly, and the rear combination lamp housing surface Therefore, no coating defect (pass portion at the joint) is formed because the adhesive is completely adhered.

In addition to the method of applying heat to the rear combination lamp housing surface of an automobile to form a loop shape, release paper or a release film made of polytetrafluoroethylene or the like is prepared in advance, and an adhesive is applied on them. It is also possible to obtain a loop shape required for maintaining the watertightness of a rear combination lamp of an automobile by previously applying a heat-resistant sealing material composition in the form of beads. There is no problem even if the thus obtained sealing material composition of the present invention is automatically or manually applied to the surface of the rear combination lamp housing of an automobile as a loop-shaped adhesive molded gasket.

In addition to the above method, the sealing material composition of the present invention is formed into a wire or cord, wound up in a required amount on a coil or a bobbin, and attached to the rear combination lamp housing of an automobile to form a molded gasket. There is no particular problem in terms of water tightness even if used in this manner. in this case,
As described above, since the pasting operation is performed at room temperature, the pasting start point and the pasting end point are not melted and mixed with each other to form an integral loop shape at the joint, and therefore, the pasting starting point and the end point are at least 10 mm from each other. It is desirable to affix the rear combination lamp housing in a wrapped manner in order to ensure a desired watertightness.

Next, a method of assembling the rear combination lamp housing coated with the adhesive sealing material composition to a vehicle will be described below. When assembling the automotive rear combination lamp coated with the sealing material composition of the present invention thus applied by heating or affixing to an automobile body after the vehicle body painting is completed, an assembling method is not particularly limited. No, as in the case of using the conventional gasket made of independent foamed resin or the butyl rubber-based adhesive described above, the machine is mounted on the vehicle body panel side using screws that are provided in advance on the lamp side for mounting on the vehicle body. Can be fastened.

When the sealing material composition of the present invention is used, it is preferably 0 to 80% in the direction of the height of application of the sealing material composition, particularly preferably with respect to the cross-section height of the bead when mechanically fastening the rear combination lamp. It is used after compression, preferably 20 to 50%. Sufficient watertightness can be ensured by using compressed in this range. 80
%, The composition itself breaks and it may be difficult to ensure sufficient watertightness.

Since the sealing material composition of the present invention immediately adheres to the painted surface of the automobile body and the housing surface of the rear combination lamp after the rear combination lamp is mounted on the vehicle, the sealing material composition No equipment such as curing and ovens are required to develop water tightness.Even if the vehicle is left in an outdoor pool for storing completed vehicles immediately after assembling the rear combination lamp, it can be used after rain or snowfall. When a large amount of water comes into contact with the sealing portion due to snow melting, the watertightness of the vehicle state is not affected.

The step of removing the rear combination lamp housing coated with the adhesive sealing material composition from the vehicle body is as follows. When the rear combination lamp attached to the automobile body is removed again as described above, the sealing material composition of the present invention may be an industrial dryer or a plastic bar for heating the sealing material to reduce the viscosity as in the related art. By releasing only the restraint of the mechanical fastening part without any removal tool such as the one described above, the rear combination lamp can be easily removed by ordinary manual work that does not require skill.

In this case, the adhesive sealing material composition of the present invention used in the gap between the vehicle body panel and the rear combination lamp is adhesively adhered to each contact surface. Since the cohesive force of the material is greater than its adhesive strength, the cohesive force of the present invention does not cause complete cohesive failure as in the case of using a conventional butyl rubber-based adhesive. The adhesive mass is peeled off without causing any remaining lump to adhere and remaining within the range of the stress of the elongation at break of the adhesive sealing material, resulting in interface destruction and easy peeling without remaining.

As described above, when the sealing material composition of the present invention is used, a special dismantling tool or the like is not required as in the case of using the molded gasket, and the sealing material composition can be obtained within a certain time regardless of the skill of the operator. The rear combination lamp can be easily removed from the vehicle body.

[0050]

The present invention will be described with reference to the following examples and comparative examples, but the present invention is not limited to these examples. Examples 1 to 4 and Comparative Example 1 1) Preparation of Adhesive Sealant Composition In terms of weight ratio (parts by weight) of each component shown in Table 1 below,
These components were put into a kneader set at 200 ° C.
The mixture was heated and melted for 20 minutes to prepare an adhesive sealing material composition.

[0051]

[Table 1]

However, each component in Table 1 is as follows. * 1 Product name Septon 2043; Septon 4033
(Kuraray Co., Ltd.) * 2 Trade names EPT1035; EPT4035 (Mitsui Petrochemical Co., Ltd.) * 3 Trade names High Wax 210MP; (Mitsui Petrochemical Co., Ltd.) * 4 Trade names Escolets 1002; (Exxon Chemical Co., Ltd.) * 5 Trade name: heavy calcium carbonate; (manufactured by Sankyo Flour Mills) * 6 Trade name: CML-35; (manufactured by Omi Chemical Industry Co., Ltd.) * 7 Trade name: Polyvis 30SH; (manufactured by NOF Corporation) PW-90 (Idemitsu Kosan) Company)

2) Adhesive sealant composition to vehicle body
Built-in sheet for dispensing and rear combination lamp
Le method adhesive sealant composition of the present invention thus obtained, a bulk meter called heating the coating apparatus, the casing plate portion is heated to 120 ° C.,
Using a coating device in which only the adhesive sealing material composition immediately below the casing plate portion is melted and sucked up by a constant flow gear pump, the temperature of the metal nozzle tip of the discharger is adjusted to 1 with respect to the rear combination lamp housing surface of the automobile.
The temperature was set at 20 ° C., and heat application was performed. The resin that constitutes the lamp housing is an ultra-high rigidity polypropylene resin,
In particular, no chemical surface treatment or primer application is performed on the surface.

The heat-applied adhesive sealing material composition is applied in a bead shape, and the bead shape has a perfect circular cross section and a bead diameter of 10 mm. Since the application temperature of the adhesive sealing material composition is sufficiently high at the application start point and the application end point, the adhesive sealant composition immediately melts and mixes in contact with each other to form a loop shape on the housing surface. If the bead surface temperature at the application starting point was about 60 ° C. or higher, the connection could not be visually confirmed between the application starting point and the application end point.

The rear combination lamp, on which the heat application was completed, was assembled on the vehicle body panel surface on which the vehicle body painting was completed, and was mechanically fastened to the vehicle body panel surface via four screws. The vehicle body coating at this time is a general acrylic melamine resin used for vehicle body coating, and in particular, no chemical surface treatment or primer application is performed on the outermost surface.

At the time of mechanical fastening, the adhesive sealing material
It was compressed in the cross-section height direction. In this case, the gap between the vehicle body panel and the housing was 5 mm, and the compression ratio of the adhesive sealing material composition was 50%.

Test Example A) Evaluation of Adhesive Sealant Composition The physical properties of the adhesive sealant compositions obtained in Examples 1 to 4 and Comparative Example 1 were evaluated by the following methods.

Test Example 1) Evaluation of Rebound Elasticity Each adhesive sealing material composition was maintained in a bead shape at a cross-section height of 10 mm and at 70 ° C. for 72 hours as shown in FIG. The compression recovery was evaluated according to the following criteria. ：: satisfactory level (compression recovery rate of 70% or more) △: improved but not satisfactory level (compression recovery rate of more than 0% and less than 70% ×: not improved (compression recovery rate of 0%)

Test Example 2) Evaluation of Dischargeability Dischargeability of each adhesive sealing material composition at 140 ° C. was evaluated according to the following criteria using a bulk melt system model 500 manufactured by Nordson. ：: Satisfactory level (10φ bead can be applied) △: Dischargeable or inferior to Comparative Example 1 (approximately 8φ bead can be applied)

Test Example 3) Evaluation of Repairability Each adhesive sealing material composition was sandwiched between polyethylene sheets having a thickness of 0.1 mm as shown in FIG. 2 to prepare a test piece, which was held at 70 ° C. for 72 hours. And then at room temperature (2
(0 to 25 ° C.), a peeling test was performed, and the destruction state was evaluated according to the following criteria. ○: Interfacial fracture △: Partial cohesive failure ×: Cohesive failure

Test Example 4) Evaluation of Water Tightness As shown in FIG. 3, each of the adhesive sealing material compositions was coated with an automotive paint on an electrodeposition coating and a resin plate (P).
P, ABS, PBT, AAS)
Water was put in the gap, and after holding at room temperature for 72 hours, the presence or absence of leakage was visually evaluated. ○: No water leakage

The results of Test Examples 1 to 4 are shown in Table 2 below.

[Table 2]

B) Evaluation Test of Water Tightness of Adhesive Sealing Material in Vehicle Condition 5) Evaluation of Water Tightness by Artificial Rain Machine To evaluate the water tightness of the rear combination lamp thus mounted on the vehicle body. Then, a large amount of artificial rainfall was performed on the completed vehicle using a May rain artificial rainfall machine, and the leakage of rainwater into the trunk room of the car was evaluated. The rainfall in this case was set to a rainfall equivalent to 20 mm per hour, and artificial rainfall was continuously performed for 12 hours from the start to the end of the rainfall.

The evaluation of rainwater leakage was performed by visually checking the rainwater leakage into the trunk room. Table 3 shows the results.
The vehicle used for evaluation was a general small passenger sedan type vehicle, with a uniform coating on the vehicle body panel surface, a zero joggle part joined by spot welding, or a surface structure without uneven panel steps Has become. Further, the body panel surface is asymmetrical left and right, and the surface shapes of the portions sealed with the sealing material composition are all left and right identical. In this way, a total of 70 completed lamps (140 lamps) were evaluated for water leakage, two on each side and two on each side. Here, "left lamp" in Table 2 indicates a lamp mounted on the left side when the vehicle is viewed from the rear.

[0065]

[Table 3]

Test Example 6) Evaluation of Watertightness by High-Pressure Car Wash Machine Then, apart from the artificial rainfall test, a high-pressure car wash was performed to evaluate the watertightness of a rear combination lamp mounted on the vehicle body. Was evaluated for rainwater leakage into the trunk room. A high-pressure car washer was used for high-pressure car washing, and tap water having a water pressure of 3.0 kgf / cm ² was injected to the rear of the vehicle. The distance from the nozzle tip to the lamp sealing site is about 30 cm. The injection amount in this case was set to a water amount equivalent to 27.5 liters per minute, and tap water was injected by the high-pressure car washer continuously for 10 minutes from the start to the end of the injection. The five vehicles used in the evaluation were the same as those described above.

The evaluation of rainwater leakage was performed by visually checking the rainwater leakage in the trunk room in the same manner as in the artificial rainfall machine test. Table 4 shows the results.

[0068]

[Table 4]

Test Example 7) Evaluation of Watertightness after Deterioration Deterioration Next, in order to evaluate the watertightness of a rear combination lamp mounted on an automobile body after durability deterioration, the adhesive sealing material composition of the present invention was evaluated. A small passenger sedan-type vehicle similar to the one used in Test Example 6 with the rear combination lamp installed was installed together with the vehicle in the environmental test room, and the following temperature history was given to the vehicle several times from low to high temperatures. Then, a car high-pressure car washer was performed, and rainwater leakage into the trunk room of the car was evaluated. The high-pressure car washer and injection conditions used in the test were the same as those in Test Example 2, and five vehicles were used in the evaluation. The evaluation of rainwater leakage was performed by visually checking the rainwater leakage in the trunk room in the same manner as in Test Example 1. The temperature history in the environmental test room was gradually lowered from room temperature to
After maintaining the temperature for a period of time, the temperature was gradually increased and maintained in a 90 ° C. atmosphere for 3 hours, and then the vehicle was gradually cooled to room temperature. This temperature history was defined as one cycle, and this cycle was performed continuously for a total of 10 cycles. After the completion of 10 cycles, after the vehicle returned to the room temperature state, a high-pressure car washer test was performed. Table 5 shows the results.

[0070]

[Table 5]

In the total of 80 vehicles used in Test Examples 5 to 7, none of the vehicles on the left and right sides showed water leakage in the trunk room, and the adhesive sealing material composition of the present invention was applied to the rear of an automobile. It has been found that excellent watertightness can be obtained by using the gap between the combination lamp and the body panel surface.

Test Example 8) Evaluation of Removal Next, after removing the rear combination lamp of the vehicle after the heat cycle test of Test Example 7 from the vehicle body panel surface, the painted surface of the vehicle body was cleaned and reassembly was possible. The time required to restore the condition was evaluated (vehicle numbers 1 to
5). The evaluation was performed with the trim parts in the trunk room removed in advance and the bolts at the mechanical fastening parts removed. The reason for evaluating the time required to clean the painted surface of the car body is that if the sealing material remaining on the painted surface of the car body is not sufficiently cleaned, the sealing material will not contact the adherend sufficiently evenly when the lamp is reassembled. This is because water leaks occur. Table 6 shows the evaluation results.

Vehicle (vehicle number 6) used as comparative example
Is a small riding sedan-type vehicle the same as that used in Test Example 5, and the rear combination lamp of this vehicle is a vehicle that has been sealed in advance with a butyl rubber-based adhesive. Further, this vehicle was left under the same heat cycle conditions as in Test Example 3, and the environmental durability deterioration conditions given to the sealing material were the same.

[0074]

[Table 6]

In the total of five vehicles used in Test Example 8, the removal of the rear combination lamp from the vehicle body panel surface does not require any special tools.
In each case, the work was completed manually within one minute, and there was no sealing material remaining on the painted surface of the vehicle body and the lamp housing surface. On the other hand, in the case of a vehicle using a conventional butyl rubber-based adhesive, an industrial dryer or a plastic crowbar is required for removal, and it takes 3 to 5 minutes to remove the rear combination lamp, and 25 to 5 to clean the adherend. It took 30 minutes. As described above, by using the adhesive sealing material composition of the present invention in the gap between the rear combination lamp for automobile and the body panel surface, not only excellent watertightness can be obtained, but also the work time required for lamp removal can be reduced. found.

[0076]

The sealing material composition of the present invention can be used, for example, in the gap between a vehicle body panel and a rear combination lamp to improve the rebound resilience of the sealing material composition under the market environment conditions in which the vehicle is used. Excellent watertightness is exhibited by the adhesive strength. Moreover,
By using the sealing material composition of the present invention, when the rear combination lamp is replaced or dismantled, the sealing material composition can be easily removed without remaining at the interface of the adherend (the painted surface of the vehicle body and the surface of the lamp housing). It is possible to improve the workability at the time of repairing or dismantling the lamp.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a method for testing the rebound resilience of an adhesive sealant composition.

FIG. 2 is a schematic diagram of a peel test method of the adhesive sealing material composition.

FIG. 3 is a schematic diagram of a method for testing the watertightness of the adhesive sealing material composition.

Continued on the front page (72) Inventor Yoshitomi Yanagi 1-10-1 Kyobashi, Chuo-ku, Tokyo Asahi Rubber Co., Ltd. (72) Inventor Tetsuo Fujimoto 1-1-10 Kyobashi, Chuo-ku, Tokyo Asahi Rubber Co., Ltd. (72) Inventor Shinichi Hori 2-221-1, Nihonbashi-Ningyocho, Chuo-ku, Tokyo Inside Parker Corporation (72) Inventor Shuji Mashiko 2-2-1-1, Nihonbashi-Ningyocho, Chuo-ku, Tokyo Parker Corporation (72) Inventor Masahiko Onishi 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture Inside Nissan Motor Co., Ltd. (72) Inventor Minoru Minano 2 Takaracho, Kanagawa-ku, Yokohama City, Kanagawa Prefecture Nissan Motor Co., Ltd. Meiji 2 Takaracho, Kanagawa-ku, Yokohama, Nissan Motor Co., Ltd. (72) Inventor Katsuyuki Arima 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. F-term (reference) 4H017 AA03 AA22 AA24 AA27 AA29 AA3 1 AB07 AB17 AC01 AC17 AD05 AE05

Claims (6)

[Claims] (A) 100 parts by weight of a block copolymer comprising polystyrene and polyolefin (B) 50 to 300 parts by weight of a tackifier (C) 50 to 400 parts by weight of an inorganic filler (D) Antifoaming agent 5 An adhesive sealant composition comprising 20 parts by weight (E) 100 to 700 parts by weight of a softener. 2. The adhesive sealing material composition according to claim 1, wherein (A) the block copolymer comprising polystyrene and polyolefin has a molecular weight of 50,000 to 300,000 and a styrene content of 10 to 50% by weight. Styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SB
S), styrene-ethylene-propylene-styrene block copolymer (SEPS) and styrene-ethylene
Butadiene / styrene block copolymer (SEBS)
At least one member selected from the group consisting of (B)
The adhesive agent is selected from the group consisting of aliphatic saturated hydrocarbon resin, hydrogenated terpene resin, terpene resin, aromatic modified terpene resin, aliphatic petroleum resin, hydrogenated rosin ester, aromatic resin and styrene resin. (C) the inorganic filler is at least one selected from the group consisting of calcium carbonate, aluminum silicate, talc, silica, diatomaceous earth, aluminum sulfate, barium sulfate, calcium sulfate, and carbon black. Yes,
(D) The foaming inhibitor is at least one selected from the group consisting of calcium oxide, magnesium oxide and molecular sieve, and (E) the softening agent is a paraffinic process oil, a naphthenic process oil, an olefinic process oil. And at least one member selected from the group consisting of polybutenes. 3. The sealing material composition according to claim 1 or 2, which is used at a temperature of 23 ° C. for a member to be sealed.
An adhesive sealant composition having a 0 ° peel strength of 10 to 50 N / 25 mm. 4. The adhesive sealing material composition according to claim 1, which is directly applied to a member to be sealed by heating and used as a sealing material, or the adhesive sealing material is used in advance. What is claimed is: 1. A sealing method, wherein a material formed by discharging a material composition is attached to a member to be sealed and used as a sealing material. 5. The sealing method according to claim 4, wherein the adhesive sealing material composition is applied or ejected in a bead shape. 6. The sealing method according to claim 5, wherein
Sealing material is 0-80% of its bead-shaped section height
A sealing method characterized by being used after being compressed.