JPH1112378A - Two-component expanded polyurethane sealant composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition exhibiting excellent anti-sagging effect, continuous extrudability, low price and setting resistance, and useful for e.g. lighting fixtures, by mixing use of each specific principal agent liquor and curing agent liquor as the two components in specific proportions. SOLUTION: This sealant composition is composed of (A) a principal agent liquor comprising (A1 ) a polyol, (A2 ) a thixotropy-imparting agent, and a catalyst and a foaming agent, and (B) a curing agent liquor. The usage of this composition is as follows: the components A and B are mixed together using a mixing extruder in weight and molar ratios B/A of (5-100):100 and (0.8-1.2):1, respectively, and the resulting mixture is extruded to a member sealing part to effect curing along with expansion. In this case, the component A1 is a mixture of (A1 <1> ) a polyether polyol 15-70 (mmg/KOH) in OH number and 2.1-3 in average functional group number and (A1 <2> ) a polyether-based polymer polyol 15-70 in OH number prepared by graft polymerization between styrene and acrylonitrile in a weight ratio A1 <1> /A1 <2> of (90:10) to (70:30), while the component A2 is surface- treated calcium carbonate 0.03-0.15 μm in primary particle size, its amount to be used being 15-45 pts.wt. based on 100 pts.wt. of the component A1 .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-component polyurethane foam sealing material composition used as a sealing material, and a sealing material containing the sealing material composition. Excellent dischargeability, and 10 polyurethane foam after foaming and curing
The present invention relates to an inexpensive two-component polyurethane foam sealing material composition having excellent set resistance at 0 ° C. and a sealing material containing the sealing material composition.

[0002]

2. Description of the Related Art A two-component polyurethane foam formed by foaming by mixing a main component liquid composed of a polyol, a catalyst, a foaming agent and the like and a curing agent liquid composed of a polyisocyanate and the like has elasticity, durability, and resistance. It is widely known that it is useful as a sealing material because of its excellent wear properties.
Depending on the shape of the sealing surface, it is not suitable to use a pre-molded sealing material.Therefore, the sealing material may be formed by directly discharging and foaming on the sealing surface. Japanese Patent Application Laid-Open No. 7-70550 discloses a method for curing and molding by discharging, casting, and foaming on a sealing surface.

In order to apply the above method to a sealing material for a vehicle lamp, a thixotropic property that, even when the sealing material is discharged onto an inclined surface or a surface with severe unevenness, does not cause dripping until the sealing material foams and hardens, The foam which has a continuous discharge property that the sealing material can be continuously discharged to the sealing surface while being mixed by the discharger, and has a permanent compression set of 40% or less after 22 hours under 50% compression at 100 ° C. It is important to have excellent set resistance (heat resistance) at 100 ° C. Therefore, a method of adding colloidal silica, general-purpose calcium carbonate, or the like as a thixotropic agent in order to improve dripping is known. Although the addition of these thixotropic agents improves the thixotropy, there are problems that the hardness of the cured product increases and the set resistance decreases. In addition, since these thixotropic agents are powders and must be added in a large amount in order to exert their effects sufficiently, when added to the main solution, the viscosity of the main solution becomes too high and the There was a problem of causing defects.

[0004] In order to solve these problems,
As a thixotropic agent, an amine compound or a mercapto compound having high reactivity with isocyanate is added and mixed, and a weak cross-linking structure is formed by these highly reactive compounds before curing with the curing agent starts, so that dripping occurs. Attempts have been made to solve such problems. For example, Japanese Patent Application Laid-Open No. 5-1273 discloses a method of adding an amine selected from aliphatic amines, aliphatic diamines and monoalkanolamines as a thixotropic agent.
No. 430 discloses a method of adding a polyvalent mercapto compound as a thixotropic agent. However, while the disclosed methods of adding these compounds can alleviate the dripping on inclined surfaces to some extent, in these methods,
Adhesion of the composition to the mixing chamber wall of the mixing and discharging machine,
Hardening easily occurs and the nozzles are also easily clogged. Therefore, in order to continuously mix and discharge, it is necessary to clean the inside of the mixing and discharging machine with a solvent such as methyl chloride for each discharge, which is problematic in terms of productivity and cost. Therefore, development of an inexpensive polyurethane foam sealing material composition for lamps that satisfies all of the thixotropy, continuous dischargeability, and set resistance at 100 ° C. has been awaited.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive two-component polyurethane foam sealing material composition that satisfies all of the thixotropy, continuous dischargeability, and set resistance at 100 ° C. An object of the present invention is to provide a two-component polyurethane foam sealing material composition in which the mixing / discharging machine can be washed with an aqueous cleaning agent after mixing, and a sealing material for lamps containing the same.

[0006]

That is, the present invention has a main solution containing a polyol, a catalyst, a foaming agent, and a thixotropic agent, and a curing agent solution. In a two-component polyurethane foam sealing material which is directly discharged to a sealing portion of a member while being mixed by a mixing and discharging machine and foamed and cured, the polyol has an OH value of 15 to 70 mmg / KOH and an average number of functional groups of 2 And a polyether polyol having an OH value of 15 to 70 mmg / KOH and containing styrene and acrylonitrile by graft polymerization, the mixing ratio of which is polyether polyol. Weight ratio of polyol to polyether polymer polyol (polyether polyol /
Polyether-based polymer polyol),
70/30 (weight ratio), wherein the thixotropic agent is 1
A surface-treated calcium carbonate having a secondary particle diameter of 0.03 to 0.15 μm, the content of which is 15 to 45 parts by weight with respect to 100 parts by weight of the polyol, and a mixture of the base liquid and the curing agent liquid; The ratio is 5 to 100 [parts by weight] / 100 [parts by weight] of the hardener liquid and the main liquid (hardener liquid / main liquid), and the molar ratio of the hardener liquid and the main liquid (hardener liquid) / (Base solution) is 0.8 to 1.2 [mol] / 1 [mol] 2
A component-based polyurethane foam sealant composition is provided.

It is preferable that the curing agent liquid contains a polyisocyanate and a modified polyisocyanate having two or more molecular terminal isocyanate groups in a molecule.

The foam obtained by foaming and curing the above two-component polyurethane foam sealing material composition has a hardness of 5 to 30 with an Asker C type hardness tester, a compression set of 100 ° C. × 22 hours,
It is preferably 40% or less under the condition of 50% compression.

Further, it is preferable that the mixing chamber can be washed off with an aqueous cleaning agent after mixing the main agent liquid and the curing agent liquid with a stirrer.

[0010] The present invention also provides a sealing material for lamps containing the two-component polyurethane foam sealing material composition.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The two-component polyurethane foam sealing material composition of the present invention (hereinafter, referred to as the composition of the present invention) is a two-pack type sealing material composition comprising a base liquid and a curing agent liquid.

The base liquid contains a polyol, a catalyst, a blowing agent, and a thixotropic agent. The polyol used in the present invention has a polyether polyol having an OH value of 15 to 70 mmg / KOH and an average number of functional groups of 2.1 to 3 and a polystyrene polyol having an OH value of 15 to 70 mmg / KOH and styrene. It contains a polyether-based polymer polyol in which acrylonitrile is graft-polymerized.

The polyether polyols include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,3-butanediol, 1,4-butanediol, 4,4'-dihydroxyphenylpropane, 4,4'- Dihydric alcohols such as dihydroxyphenylmethane; glycerin, 1,1,
Polyhydric alcohols such as 1-trimethylolpropane, 1,2,5-hexanetriol and pentaerythritol;
Diamines such as ethylenediamine and aromatic diamine;
Polyols obtained by adding one or more alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide and styrene oxide to one or more sugars such as sorbitol; and polyoxytetramethylene oxide and the like. No. These polyether polyols may be used alone or in combination of two or more.

The OH number of these polyether polyols is from 15 to 70 mmg / KOH. This is because an OH value within the above range is preferable from the viewpoint of physical properties of a cured product obtained after foaming and curing the composition of the present invention. The OH value of the polyether polyol is preferably 20 to 40 mmg /
KOH. The number of functional groups of the polyether polyol is 2.1 to 3 on average. This is because the average number of functional groups within the above range is preferable from the viewpoint of the hardness of the obtained cured product. The average number of functional groups is preferably 2.8 to 3.0.

The above-mentioned polyether-based polymer polyol is obtained by reacting an ethylenically unsaturated monomer such as styrene and acrylonitrile in the presence of the above-mentioned polyether polyol with an azo radical initiator at a temperature of 130 to 230 ° C. Alternatively, it refers to a polymer polyol which is added together with a peroxide, is graft-polymerized, precipitates and disperses an acrylic thermoplastic resin, stabilizes the thermoplastic resin, and is present, thereby improving heat resistance. As the ethylenically unsaturated monomer to be graft-polymerized to the polymer polyol, in addition to the above, methyl acrylate and the like may be contained. These polyether polymer polyols may be used alone or in combination of two or more.

The OH value of these polyether-based polymer polyols is 15 to 70 mmg / KOH. OH
It is because the value within the above range is preferable from the viewpoint of physical properties of a cured product obtained after foaming and curing the composition of the present invention. Preferably, the OH number of the polyether polyol is between 20 and
It is 50 mmg / KOH.

In the polyol used in the present invention,
The mixing ratio of the polyether polyol and the polyether-based polymer polyol is 90/10 to 70/30 by weight ratio of the polyether polyol and the polyether-based polymer polyol (polyether polyol / polyether-based polymer polyol). (Weight ratio), preferably 85/15 to 75/25 (weight ratio). If the amount of the polymer polyol is less than 10 parts by weight, the setting resistance of the cured product after foaming and curing of the composition of the present invention is not good, and if it exceeds 30 parts by weight, the hardness of the cured product is too high.

The polyol used in the present invention includes:
A polyol other than the polyether polyol and the polyether-based polymer polyol may be contained as long as the characteristics of the polyol of the present invention in which the polyether polyol and the polyether-based polymer polyol are used in combination are not impaired. As such a polyol, the main chain is carbon-
Polyols comprising carbon bonds, for example, acrylic polyols, polybutadiene polyols, hydrogenated polybutadiene polyols and the like, and low molecular polyols such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butanediol, pentanediol and hexanediol are preferred. Is exemplified.

The catalyst used in the composition of the present invention may be, for example, an organotin compound such as dibutyltin dilaurate, dioctyltin dimaleate, stannous octylate, dibutyltin oxide, or tetrabutyl titanate. Organic titanate compounds, organometallic curing catalysts such as lead naphthenate and lead octylate, and tertiary amines such as triethylenediamine, triethylamine, N-methylmorpholine and N, N-dimethylethanolamine are used alone or in combination. be able to. When a tertiary amine is used, preferably, triethylenediamine, tetramethylenediamine and the like can be used. When a tertiary amine is used, 0.05 to 3.0 parts by weight, especially 0.5 to 3.0 parts by weight, per 100 parts by weight of the polyol.
2.0 parts by weight is preferable because good foamability is imparted.

The blowing agent used in the composition of the present invention may be CFC, CFC alternative, methyl chloride, water, etc., but it is preferable to use distilled water from the viewpoint of environmental protection. The amount of distilled water added as a blowing agent is 10
0.05 to 2.0 parts by weight, especially 0.1
The amount is preferably 1.0 to 1.0 part by weight because a good waterproof property can be obtained while securing sufficient foaming properties.

The composition of the present invention has a primary particle size of 0.03 to 0.15 μm, preferably 0.1 to 0.1 μm, as a thixotropic agent.
A surface-treated calcium carbonate having a thickness of from 0.05 to 0.10 μm is used. The surface treatment of calcium carbonate may be a general surface treatment, for example, a treatment with a higher fatty acid or a fatty acid ester. The particle size of the calcium carbonate is extremely fine as in the above range. When the primary particle size is within the above range, the dispersion of the calcium carbonate in the base liquid and in the composition after mixing is good, and the uncured composition is dispersed by the aqueous cleaning agent described below. Good because it can be easily washed. The content of the calcium carbonate is 15 to 45 parts by weight based on 100 parts by weight of the polyol. If the amount is less than 15 parts by weight, the resulting composition of the present invention will not have sufficient thixotropic properties. If the amount exceeds 45 parts by weight, the viscosity ratio of the base liquid and the curing agent liquid is too large to mix the two liquids. Because it is possible. The content of calcium carbonate is preferably 20 to 35 parts by weight based on 100 parts by weight of the polyol.
The composition of the present invention containing the above calcium carbonate has the property that foaming of the composition is delayed by the calcium carbonate and the cream time is prolonged. For this reason,
The composition of the present invention has a characteristic that when the composition is mixed, discharged, and foamed and hardened, it is not necessary to wash each time, and excellent in continuous discharging property.

As the thixotropic agent of the present invention, in addition to the surface-treated calcium carbonate, other thixotropic agents may be used in combination as long as the effect of the surface-treated calcium carbonate is not impaired. Other thixotropic agents include chemically stable compounds such as aliphatic amide wax and PTFE (polytetrafluoroethylene resin), and inorganic fillers such as silica.

In the base solution of the composition of the present invention, in addition to the above-mentioned essential components, a foam stabilizer such as a silicon-based surface-active compound, a plasticizer, and an antioxidant, as long as the effects of the present invention are not impaired. And various additives such as an ultraviolet absorber, a light stabilizer, an antioxidant, a coloring agent for a pigment or a dye, and a dispersant.

As the curing agent liquid of the present invention, a polyisocyanate used in an ordinary polyurethane resin composition can be used. Preferably, polyisocyanate and two or more molecular terminal isocyanate groups in a molecule are used. Those containing a modified polyisocyanate having the formula: Examples of such a polyisocyanate include tolylene diisocyanate, hydrogenated tolylene diisocyanate, diphenylmethane diisocyanate, polymeric polyisocyanate, polymethylene polyphenylene polyisocyanate, xylylene diisocyanate (XDI), 1,5-naphthalenedi isocyanate (N
Aromatic polyisocyanates such as DI); aliphatic polyisocyanates such as hexamethylene diisocyanate (HDI); alicyclic polyisocyanates such as isophorone diisocyanate, H ₆ XDI (hydrogenated XDI) and H ₁₂ MDI (hydrogenated MDI); A carbodiimide-modified polyisocyanate of each of the above-mentioned polyisocyanates, or an isocyanurate-modified polyisocyanate thereof, and the like can be given. Among these, a 4,4-diphenylmethane diisocyanate derivative or polymeric MDI (also known as crude MDI) is preferable. These may be used alone or in combination of two or more.

The modified polyisocyanate having two or more molecular terminal isocyanate groups in a molecule used in the curing agent liquid of the present invention is defined as a molecule derived from the polyisocyanate and the polyol and having two or more molecules in the molecule. It is a urethane prepolymer having a terminal isocyanate group. Among these, a modified polyisocyanate represented by a urethane prepolymer having two or more isocyanate groups at the terminal functional group derived from an aromatic diisocyanate and a polyol is preferable. These may be used alone or in combination of two or more.

The mixing ratio between the main agent liquid and the curing agent liquid is as follows:
The weight ratio of the hardener liquid to the main liquid (hardener liquid / main liquid) is 5 to 5.
100 [parts by weight] / 100 [parts by weight] and a molar ratio of the curing agent liquid to the main liquid (curing agent liquid / main liquid) of 0.8 to 1.
2 [mol] / 1 [mol]. When the mixing ratio is within the above range, a normal foam can be obtained and the hardness of the foam is sufficient. In particular, the weight ratio of the curing agent liquid to the base liquid is 10 to 3
0 [parts by weight] / 100 [parts by weight], and the molar ratio of the curing agent liquid to the base liquid is preferably 1.0 to 1.1 [mol] / 1 [mol].

Next, a method for producing the composition of the present invention or the sealing material for a lamp of the present invention containing the composition will be described. The following description is made with reference to the accompanying drawings, but the method for producing the composition of the present invention is not limited to the following examples. The composition of the present invention is discharged directly onto a seal portion of a member such as a lamp housing while being mixed with a base liquid and a hardener liquid by a mixing / discharging machine, and foamed and cured. The mixing and discharging machine used in the present invention can discharge while mixing the base liquid and the curing agent liquid, and the discharge speed is usually 20 to 2
00g / min and the mixing speed of the rotor is 1000-6
000 rotations / minute. The example shown in FIG. 1 shows a method for producing the composition of the present invention using the mixing and discharging machine 2 as an example.
In the example shown in FIG. 1, the main agent liquid is filled in the main agent tank 10, and the curing agent liquid is charged in the curing agent tank 12. The main agent passes through the supply line by the supply line pump 14,
The curing agent is supplied to the mixing chamber 20 via the supply line by the supply line pump 16. The main agent liquid and the curing agent liquid are stirred and mixed by the rotor 22 in the mixing chamber 20. The composition adjusted in the mixing chamber 20 is directly discharged from the nozzle 24 to a seal portion on the member, and foamed and hardened on the member.

The composition of the present invention obtained as described above comprises:
When uncured, it has excellent thixotropic properties and does not drip even if it is discharged to a seal or the like on an inclined member. Also,
As described above, the composition of the present invention contains, as a thixotropic agent, surface-treated calcium carbonate having an extremely small particle size, and has good dispersibility of the thixotropic agent in the base solution.
Also, the dispersibility of the thixotropic agent in water as a foaming agent is good. Further, the reaction between the base liquid and the curing liquid of the composition of the present invention is mild. For this reason, the composition of the present invention is continuously mixed in the process of manufacturing and applying the sealing material composition which is stirred and mixed by the rotor in the mixing chamber, is directly discharged from the nozzle to the seal portion on the member, and foams and hardens on the member. It is excellent in continuous mixing property that enables mixing and continuous ejection, and continuous ejection property. Therefore, the composition of the present invention is different from the conventional production and construction of the two-component polyurethane foam sealing material composition in that the mixing chamber and the nozzle are washed each time the mixture is discharged, and the mixing property and the discharge property of the mixture are improved. It is not necessary to secure it, and it is excellent in productivity. In addition, the composition of the present invention can be easily washed off with an aqueous detergent when it is not cured. Here, the aqueous cleaning agent refers to a cleaning agent containing water and a surfactant and containing no solvent. For this reason, in order to ensure the mixing and discharging properties of the mixture in the mixing and discharging machine, as in the production and construction of the conventional two-component polyurethane foam sealing material composition, the mixing chamber and the nozzle of the mixing and discharging machine are methyl chloride. There is no need to wash with a solvent such as, for example, and an aqueous cleaning agent can be used for washing. Therefore, the composition of the present invention does not need to use a large amount of solvent for cleaning, so that the production cost can be reduced and the composition can be produced and applied at low cost. In the cleaning in the production and construction of the composition of the present invention, for example, using the example shown in FIG. 1, a high-pressure aqueous cleaning agent is supplied from the nozzle 24 into the mixing chamber 20 and the nozzle 24 every approximately 100 discharges. Into the mixing chamber 20 by water pressure,
In addition, the uncured composition adhered to the nozzle 24 can be easily washed off.

The foam obtained by foaming and curing the composition of the present invention obtained as described above (hereinafter referred to as the foam of the present invention) has the original hardness of the foam obtained by adding a thixotropic agent,
Deterioration of basic required characteristics such as compression set is small. The cured product of the foam of the present invention is a hardness meter SRIS (Japanese Rubber Association Standard) 0101 Asker C hardness meter (Asker C hardness meter manufactured by Kobunshi Keiki Co., Ltd .; 54mm x 5.08mm)) with a hardness of 5
30, compression set (100 ° C. under sample conditions described in JIS K-6401 soft urethane foam for cushion)
× 22 hours, after 50% compression) is preferably 40% or less. The above range is preferable because when the foam of the present invention is pressed between members and used as a sealing material, the foam adheres to the members and keeps the seal portion liquid-tight, and it is difficult to settle over time. The foam of the composition of the present invention has excellent set resistance (heat resistance) at 100 ° C. as described above, and has a dense skin layer and excellent water repellency. Therefore, it can be suitably used for, for example, a sealing portion of a member which is likely to be heated and which is easily splashed with water, such as a vehicle lamp. Therefore, the composition of the present invention is useful as a sealing material for lamps.

[0030]

EXAMPLES The present invention will be described more specifically with reference to the following examples, but the present invention is not limited to the following examples. Production of sealing material composition (Examples 1 to 4)
A sealing material composition was produced using a main agent liquid comprising a catalyst, a foaming agent, a foam stabilizer, a thixotropic agent using calcium carbonate, and a curing agent liquid comprising polyisocyanate.

(Comparative Examples 1 to 9)
A sealing material composition was produced using a base liquid composed of a polyol, a catalyst, a foaming agent, a foam stabilizer, and a thixotropic agent, and a curing agent liquid composed of a polyisocyanate. Only Comparative Example 1 did not contain the thixotropic agent.

In the above Examples and Comparative Examples, the following compounds were used. Polyether polyol: polyoxyalkylene polyether polyol (EP-240, manufactured by Mitsui Toatsu Chemicals, Inc.
Polymer weight: acrylonitrile, styrene-containing polyether-based polymer polyol (POP36 / 2)
0, manufactured by Mitsui Toatsu Chemical Co., molecular weight 8415, trifunctional) Catalyst: 33% solution of triethylenediamine (L-33, manufactured by Takeda Pharmaceutical Co., Ltd.) and tetramethylethylenediamine (M
R, manufactured by Takeda Pharmaceutical Co., Ltd. at a ratio of 0.4 / 0.6 Foaming agent: Water Foam stabilizer: Polyoxyalkylene silicone polymer (SZ)
-1627, manufactured by Nippon Unicar) Thixotropic agent: The following A to D were prepared and used. A: Colloidal silica (R-202, manufactured by Nippon Aerosil Co., Ltd.) B: Light calcium carbonate (untreated, particle size: 1 μm, manufactured by Maruo Calcium Co.) C: Trimethylolpropane tristhioglycolate (TMTG, manufactured by Yodo Chemical Co., Ltd.) D) Calcium carbonate (fatty acid treatment, particle size 0.07 μm,
(Calfine MS-700, manufactured by Maruo Calcium Co., Ltd.) Curing agent: polyisocyanate (M-50, NCO% is about 32%, manufactured by Mitsui Toatsu Chemicals, Inc.)

Evaluation of Physical Properties of Sealant Composition The physical properties of the sealant compositions obtained in the above Examples and Comparative Examples were evaluated by the following methods. (1) Anti-dripping property (thixotropic property) The base liquid and the curing agent liquid were uniformly mixed, and applied to a rail having a width of 40 ° and a width of 5 mm and a height of about 5 mm by 10 mm. As for the length of the dripping, ○ indicates 6 mm or less, and X indicates 6 mm or more. (2) Continuous Mixing Using a scanning electron microscope, the bubble diameter after five consecutive discharges (discharge for 12 seconds, pause for 3 seconds) was measured and evaluated. ○ indicates that the bubbles were all less than 200 μm in diameter and X was
This indicates that at least one bubble-shaped object having a diameter of 200 μm or more was formed. (3) Foam Hardness The foam hardness was measured with an Asker C type hardness tester (Japan Rubber Association Standard 0101, manufactured by Kobunshi Keiki Co., Ltd.). (4) Foam Compression Set The volume of the sealing material composition obtained by mixing the main agent liquid and the curing agent liquid and foaming and hardening is compressed to 50%, left at 100 ° C. for 22 hours, and then remove the load to room temperature. At 30 minutes or more, and the ratio of the reduced thickness to the thickness before compression deformation was shown. The unit is [%]. Table 1 shows the results. In the table, the unit of the compounding amount of the compound of the main agent and the curing agent is [parts by weight].

[0034]

[0035]

[0036]

[0037]

The two-component polyurethane foam sealing material composition of the present invention is obtained by combining a polyether polyol and a polymer polyol in a base solution and containing a surface-treated calcium carbonate having a small particle size as a thixotropic agent. , Thixotropic, and excellent set resistance at 100 ° C. Furthermore, since the reaction between the curing agent and the thixotropic agent in the composition of the present invention is gentle, the composition is excellent in continuous discharge properties and continuous mixing properties. In addition, the inherent hardness and compression strain of the polyurethane foam are good. Further, the washing of the mixing and discharging machine after the mixing and discharging can be easily performed with the aqueous cleaning agent, which is excellent in productivity and cost.

[Brief description of the drawings]

FIG. 1 shows an example of a mixing / discharging machine for producing a two-component polyurethane foam sealing material composition of the present invention, and an example of producing a seal for a vehicle lamp.

[Explanation of symbols]

 2 Mixing and Dispensing Machine 10 Main Agent Tank 12 Hardener Tank 14, 16 Pump 18 Spindle 20 Mixing Chamber 22 Rotor (Rotor) 24 Nozzle 26 Vehicle Lighting Housing 28 Sealing Material Composition

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akihito Kanemasa 2-1 Oiwake, Hiratsuka-shi, Kanagawa Inside Yokohama Rubber Co., Ltd. Hiratsuka Factory

Claims (5)

[Claims] The present invention has a main liquid containing a polyol, a catalyst, a foaming agent, and a thixotropic agent, and a hardener liquid. In a two-component polyurethane foam sealing material that is directly discharged to a seal portion and foamed and cured, the polyol is a polyether polyol having an OH value of 15 to 70 mmg / KOH and an average number of functional groups of 2.1 to 3, An OH value is 15 to 70 mmg / KOH, which contains a polyether-based polymer polyol containing styrene and acrylonitrile by graft polymerization, and the mixing ratio is the weight of the polyether polyol and the polyether-based polymer polyol. Ratio (polyether polyol /
Polyether-based polymer polyol),
70/30 (weight ratio), wherein the thixotropic agent has a primary particle size of 0.03 to 0.15 μm
Is a surface-treated calcium carbonate having a content of 15 to 45 parts by weight with respect to 100 parts by weight of the polyol, and a mixing ratio of the main agent liquid and the hardener liquid, 5-100 parts by weight / 100 parts by weight in weight ratio (hardener liquid / base liquid) and 0. 0 in molar ratio of hardener liquid to base liquid (hardener liquid / main liquid).
A two-component polyurethane foam sealing material composition having a ratio of 8 to 1.2 [mol] / 1 [mol]. 2. The two-component polyurethane foam sealing material composition according to claim 1, wherein the curing agent liquid contains a polyisocyanate and a modified polyisocyanate having two or more molecular terminal isocyanate groups in a molecule. . 3. A foam obtained by foaming and curing the two-component polyurethane foam sealing material composition has a hardness of 5 to 30 with an Asker C type hardness meter and a compression set of 100 ° C. × 22 hours.
The two-component polyurethane foam sealing material composition according to claim 1 or 2, wherein the composition is 40% or less under a condition of 50% compression. 4. The two-component system according to claim 1, wherein the main component liquid and the curing agent liquid are mixed in a mixing chamber having a stirrer, and then the mixing chamber can be washed off with an aqueous cleaning agent. Polyurethane foam sealant composition. 5. A sealing material for a lamp, comprising the two-component polyurethane foam sealing material composition according to claim 1.