KR102375885B1 - Sealant - Google Patents

Abstract

The present invention relates to a silylated polyurethane-based hybrid sealant composition for sealing gaps between automobiles and parts, buildings, windows, and runways, and more particularly, to a novel silylated polyurethane-based hybrid sealant with high mechanical strength and excellent elongation. will provide

Description

Silylated polyurethane-based hybrid sealant {Sealant}

The present invention relates to a sealant composition for sealing gaps between automobile parts, buildings, windows, and runways, and more particularly, to provide a new sealant having high mechanical strength and excellent elongation.

A material that is filled to maintain watertightness and airtightness against gaps or gaps, such as between automobile body and parts, between windows and window frames, between building materials and structures, and between blocks of runways, etc. And it is used for the purpose of improving the durability of the building by fixing the member with elasticity.

In particular, a sealing material having elasticity is also referred to as a sealant, and the sealant must have sufficient physical properties such as extrusion workability and curable adhesion. In addition, when fixing the gap between the window frame and the window of a building structure, there is a characteristic that must satisfy physical properties such as external temperature change, wind or long-term vibration, or elastic restoration properties.

In addition, automotive sealants are used in parts such as tail lights, headlights, windshields, windows, etc. to prevent deformation due to vibration or expansion and contraction of members in addition to airtight and watertight functions. By absorbing the above properties, physical properties such as preventing breakage are required.

Also, especially when the runway connects large concrete blocks and blocks, such as on an airplane runway, when the gap between the blocks is filled with sealant, a large stress is applied to the road surface while the airplane lands. At this time, it must have high elastic recovery properties that recover as much as the distance moved by the sealant connecting and sealing between the blocks, and must have mechanical properties such as not to be destroyed by large stress during takeoff and landing of aircraft. materiality is required. That is, a runway is the most important facility among airport facilities, and it can function as an aerodrome by having a taxiway, a terminal, a maintenance facility, and facilities necessary for handling passengers and cargo. Sufficient strength is required to withstand the weight of the aircraft on the run and the impact of landing, and the joint between the concrete plates of the runway is specially designed for movement using excellent movement capability (+100/-50%). Therefore, the sealant installed on the runway should be able to overcome the difference in the coefficient of thermal expansion between concrete and asphalt and to prevent distortion of the concrete plate during takeoff and landing of aircraft. Accordingly, since a sealant for the aviation industry used for an airport runway requires a high elongation ratio, a sealant with new properties satisfying these characteristics is required.

In addition, as sealant properties, the cured filling sealant must satisfy elasticity, which is a movement-resistant performance that does not rupture or peel even when the joint is moved. , water resistance and chemical resistance must be satisfied.

In the end, the sealant should sufficiently respond to the movement occurring in the joint, there should be no abnormal deformation when stress is generated, exhibit strong adhesion over a long period of time, and exhibit little change in water resistance, adhesion, and temperature and humidity. Physical properties such as adhesion are required.

Korean Patent Publication No. 10-1045297 (June 23, 2011)

In order to solve the above problems, the present invention provides a new sealant composition having high mechanical properties having a high elongation of 400% or more, preferably 1,000% or more, and a moisture curing sealant using the same.

In order to achieve the above object, the present invention provides a sealant composition comprising a modified polyurethane resin having a silane end-capped structure having a specific structure and a curing catalyst, and a moisture-cured sealant using the same.

In addition, the present invention provides a sealant composition for providing a sealant having sufficient elasticity and resiliency in places subject to extreme stress and strain, such as in the automobile field and on an aircraft runway.

As a result of many studies to solve the above problems,

The present inventors provide a sealant composition comprising a siloxane-modified polyurethane resin in which both ends of a polyurethane diol are end-capped with trialkoxysilane or dialkoxyalkylsilane, a filler, and a curing catalyst, whereby the elongation is 400% or more, preferably 700 % or more, more preferably 1,000% or more, has been found to provide an elastic sealant, and thus the present invention has been completed.

One aspect of the present invention is one selected from a first modified polyurethane resin in which both ends of the polyurethane diol are end-capped with trialkoxysilane and a second modified polyurethane resin in which both ends of the polyurethane diol are end-capped with alkyldialkoxysilane. Provided is a sealant composition prepared including one or two components of a modified polyurethane resin, a curing catalyst, and a filler.

In one aspect of the present invention, there is provided a sealant composition, wherein the polyurethane diol is a polyurethane diol prepared by reacting a polyester-based diol with a diisocyanate, or a sealant prepared using the same.

In one aspect of the present invention, since the polyurethane diol is a polyurethane diol prepared by including a polyester-based diol and a cyclic aliphatic diisocyanate, it has the best elongation and elasticity, and also has excellent mechanical properties. Unlike other aspects of

In one aspect of the present invention, the first modified polyurethane resin is capped with isocyanatoalkyltrialkoxysilane (NCO-R'-Si(OR ₂ ) ₃ ) at both ends of the polyurethane diol, and the The second modified polyurethane resin may be one in which both ends of the polyurethane diol are capped with isocyanate alkyldialkoxyalkylsilane (NCO-R′-Si(R″)(OR ₂ ) ₂ ). of R, R' and R″ are each independently a C1-C8 alkyl group.)

Further, in one aspect of the present invention, the sealant composition further comprises one or more additives selected from additives such as plasticizers, antioxidants, UV inhibitors, lubricants, pigments, dyes, dehydrating agents, long-term property stabilizers, and adhesion-imparting agents. can do.

In one aspect of the present invention, the long-term physical property stabilizer may be one or two or more components selected from mono, di or trialkoxysilane compounds having a reactive group selected from a vinyl group, an allyl group, a methacryl group, and an acryl group. .

In one aspect of the present invention, the adhesion imparting agent may be a silane compound containing an amine group.

In one aspect of the present invention, the curing catalyst may use a tin (Tin)-based catalyst. In addition, the capping may be capping in the presence of a tin-based catalyst.

In one embodiment of the present invention, the sealant composition may include 0.01 to 5 parts by weight of a curing catalyst and 1 to 300 parts by weight of a filler based on 100 parts by weight of the modified polyurethane diol.

In addition, the sealant composition may include 1 to 80 parts by weight of a plasticizer based on 100 parts by weight of the modified polyurethane diol.

In addition, the sealant composition may include 1 to 20 parts by weight of a long-term physical property stabilizer and 1 to 10 parts by weight of an adhesion imparting agent based on 100 parts by weight of the modified polyurethane diol.

In one aspect of the present invention, the silane end-capped modified polyurethane resin is 1 to 50 parts by weight based on 100 parts by weight of the trialkoxy end-capped modified polyurethane resin and/or the dialkoxy end-capped modified polyurethane resin. Monoalkoxy endcapped modified polyurethane resins may also be included.

The sealant according to the present invention has excellent strain resistance characteristics such as an elongation of 400% or more, preferably 700% or more, very preferably 1,000% or more, and an elastic recovery property of 90% or more. role is possible.

When the sealant has a high elongation rate as described above, it is possible to improve the adhesiveness of the sealed part of the automobile in winter and reduce the occurrence of cracks, reduce the occurrence of cracks and damage due to external impact, and also increase the elongation rate in the sealant for the aviation industry. It is good to prevent distortion of the concrete flat plate.

1 is an embodiment of a specimen for measuring the elongation of the sealant of the present invention.
Figure 2 shows a method for measuring the elasticity of the present invention.

Hereinafter, the present invention will be described in more detail through embodiments or examples including the accompanying drawings. However, the following specific examples or examples are only a reference for describing the present invention in detail, and the present invention is not limited thereto, and may be implemented in various forms.

Also, unless defined otherwise, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description herein is for the purpose of effectively describing particular embodiments only and is not intended to limit the invention.

Also, the singular forms used in the specification and appended claims may also be intended to include the plural forms unless the context specifically dictates otherwise.

Also, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

Hereinafter, the components of the present invention will be described in detail.

The present invention relates to a sealant composition comprising at least one silane-modified polyurethane resin selected from silane-modified polyurethane resins in which both ends of a polyurethane diol are ent-capped with trialkoxysilane or dialkoxysilane, a filler and a curing catalyst, and a sealant composition prepared therefrom It relates to a cured (eg cured by moisture curing, etc.) sealant.

In the present invention, the polyurethane diol is prepared by reacting a polyester diol with a diisocyanate, and the molar ratio of the polyester diol and the diisocyanate is not particularly limited as long as the structure of the prepared polyurethane diol is a terminal diol. For example, it can be prepared by preparing a molar ratio of diisocyanate and polyester-based diol in a molar ratio of 1:1.01 to 1.2.

In the present invention, the polyester-based diol is not particularly limited as long as the object of the present invention is achieved, but may have a number average molecular weight of 50 to 10,000.

The diisocyanate compound of the present invention is not particularly limited as long as it is a conventional one,

It is preferable to include an aliphatic diisocyanate or an alicyclic isocyanate, and more preferably, to include an alicyclic diisocyanate, since it has a more remarkable effect in terms of elongation and elasticity, it is more preferred.

The aliphatic diisocyanate may include, but is not limited to, butane diisocyanate, pentane diisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, lysine diisocyanate, and the like, but the present invention is not particularly limited thereto.

In addition, the alicyclic isocyanate of the present invention means a compound having a cyclic aliphatic hydrocarbon having no aromaticity in the molecule, and is not particularly limited, for example, isophorone diisocyanate, hydrogenated xylylene isocyanate, hydrogenated diphenyl Methane diisocyanate, 1, 4- cyclohexane diisocyanate, etc. are mentioned. Among the alicyclic diisocyanates, isophorone diisocyanate, hydrogenated xylylene isocyanate, hydrogenated diphenylmethane diisocyanate, or a mixture thereof, or including these is preferable, which has better weather resistance, flexibility and stretchability of the sealant. It is preferred because it is excellent.

Next, the curing catalyst of the present invention will be described.

The curing catalyst of the present invention can be used without limitation as long as the alkoxysilane end groups can be cured by condensation reaction with each other. The condensation reaction catalyst may include, for example, a tin-based catalyst, without limitation, a dialkyltin dialkylate-based catalyst, and specifically, dibutyltin dilaurate may be used, but this It is not limiting.

In the present invention, polyurethane diol can be prepared by reacting the polyester-based diol and diisocyanate in the presence of a catalyst. The reaction catalyst of the present invention may be used in the same manner as the alkoxysilane curing catalyst, or other catalysts may be used, so it is not necessary to specifically specify it in the present invention. Considering the raw material cost, it is more preferable to use the tin-based catalyst.

The molecular weight of the polyurethane diol of the present invention is not particularly limited as a weight average molecular weight, but when 5000 to 50,000 are used, sufficient mechanical strength can be provided, and at the same time, it has elastic recovery properties and at the same time has good elongation by 400%. Since an elongation of 700%, more preferably 1,000% or more can be given, it is more preferred in the present invention, but it is not necessarily limited thereto.

In addition, in the present invention, the alkoxysilane cappingdin-modified polyurethane resin comprises isocyanatoalkyltrialkoxysilane (NCO-R-Si(OR ₂ ) ₃ ) or/and isocyanate alkyldialkoxy at both ends of the polyurethane diol. It may be capped by reacting with alkylsilane (NCO-R-Si(R)(OR ₂ ) ₂ ). (In the above, each of R, R' and R″ is independently a C1-C8 alkyl group.)

The sealant composition of the present invention can provide an elastic sealant having an elongation of 400% or more, preferably 700% or more, and more preferably 1,000% or more, when cured using the same (for example, moisture curing), as measured by ASTM D412. can

The present invention also provides a sealant composition comprising a mixed modified polyurethane resin of the modified polyurethane resin end-capped with trialkoxy salan and the modified polyurethane resin end-capped with dialkoxy silane, and a sealant manufactured using the same.

The present invention also provides a sealant composition wherein the polyurethane diol is a polyurethane diol prepared by reacting a polyester diol with a diisocyanate, or a sealant prepared using the same.

In addition, since the polyurethane diol of the present invention is a polyurethane diol prepared by including a polyester diol and an aliphatic cyclic diisocyanate, it has the best elongation and elastic recovery properties and also has excellent mechanical properties. otherwise prefer

Also, in the present invention, the sealant composition may further include a filler. The filler is not particularly limited, but for example, components such as calcium carbonate, metal chloride, metal oxide, metal nitride, zeolite, talc, metal carbonate, or a filler including these components may be used, light charcoal heavy carbon, dioxide Since various materials such as titanium may be used, the present invention is not limited thereto. In the present invention, the filler may be used in an amount of 50 to 300 parts by weight based on 100 parts by weight of the modified polyurethane resin, but is not necessarily limited thereto.

In addition, the present invention may further include a plasticizer in the sealant composition. The plasticizer of the present invention increases the viscosity stability of the sealant composition, imparts excellent properties to the long-term elongation property of the sealant, and significantly increases extrudability during construction. It is preferred because it can improve construction stability. In the sealant composition of the present invention, it is preferred to use 10 to 80 parts by weight of the plasticizer based on 100 parts by weight of the modified polyurethane resin in order to achieve the object of the present invention. The plasticizer used in the present invention is not particularly limited as long as it is a plasticizer used for processing of ordinary PVC (PVC), etc. For example, phthalic acid, hydrogenated phthalic acid, trimeritic acid, epoxy, polyester, etc. DOP (PHTHALIC ACID DI-2 ETHYL-HEXYL), DIDP (PHTHALIC ACID DI-ISO DECYL), DINP (PHTHALIC ACID DI-ISO NONYL), DBP (PHTHALIC ACID DI-BUTYL), TOTM ( TRI-MERITIC ACID TRI-2 ETHYL HEXYL), DOA (ADIPINIC ACID DI-2 ETHYL HEXYL), DINCH (1,2-cyclohexanedicarboxylic acid diisononyl ester), and the like can be used. not.

In addition, the sealant composition of the present invention may further add a long-term physical property stabilizer. The long-term physical property stabilizer reacts with the alkoxysilane-capped modified polyurethane resin of the present invention, and contains a reactive group, so that curing according to change with time proceeds slowly, preventing deterioration of elongation and elasticity restoration performance due to deterioration during long-term use do it The long-term physical property stabilizer of the present invention may include, for example, a mono-, di-, or trialkoxysilane compound having a reactive group selected from a radical polymerizable vinyl group, an allyl group, a methacryl group, an acryl group, etc., specifically, vinyltriethoxy and compounds such as silane.

The long-term physical property stabilizer of the present invention may be used in an amount of 1 to 20 parts by weight based on 100 parts by weight of the modified polyurethane resin, but is not limited thereto.

In addition, the present invention may further add a silane compound having a mono or diamino group as an adhesion imparting agent for increasing the adhesion of a surface such as concrete, glass, or metal or wood, which is an adherend, using the sealant composition of the present invention. . The amino silane compound of the present invention is better because the amino group participates in curing while water cross-linking strengthens hydrogen bonding to increase adhesion with the substrate, which is an adherend, so that it has an adhesive effect and a waterproof effect. The adhesion imparting agent is used in an amount of 1 to 10 parts by weight based on 100 parts by weight of the modified polyurethane resin, but is not limited thereto.

In addition, the present invention may further include one or more additives selected from additives such as plasticizers, antioxidants, UV inhibitors, lubricants, pigments, dyes, dehydrating agents, and adhesion imparting agents in the sealant composition of the present invention. Each of the additives may be used in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of the modified polyurethane resin, but is not limited thereto.

In the present invention, the curing catalyst may be a tin (Tin)-based catalyst.

In the present invention, the sealant composition may contain 1 to 80 parts by weight of a plasticizer, 10 to 300 parts by weight of a filler, and 0.01 to 5 parts by weight of a curing catalyst based on 100 parts by weight of the modified polyurethane resin.

In the present invention, the silane end-capped modified polyurethane resin is 1 to 50 parts by weight based on 100 parts by weight of the trialkoxy end-capped modified polyurethane resin and/or the dialkoxy end-capped modified polyurethane resin is monoalkoxy end-capping. It may also include a modified polyurethane resin.

Hereinafter, the present invention will be described in more detail based on Examples and Comparative Examples. However, the following examples and comparative examples are merely examples for explaining the present invention in more detail, and the present invention is not limited by the following examples and comparative examples.

[Production Example 1] SLPU polymer

100 parts by weight of polyester diol (Songwon Industrial SS-20N, OH value; 57.33 mgKOH/g) was added to the reactor and mixed. After raising the reaction temperature to 70° C., 0.01 parts by weight of dibutyl tin dilaurate is added and mixed. 11 parts by weight of isophorone diisocyanate (IPDI, NCO/OH=0.95) was added and stirred while maintaining the reaction temperature of 82°C. If the NCO peak (2,267 ~ 2,270 cm ^-1 ) is not confirmed using FT-IR, it is used as the end point of the first-step reaction. Lower the reaction temperature to 70°C, add 3.1 parts by weight of 3-isocyanatopropyl trimethoxysilane (ICPTMS, NCO/OH=0.05), and stir while maintaining the temperature at 80°C. If the NCO peak is not confirmed using FT-IR, it is used as the end point of the two-step reaction. The temperature was lowered to room temperature, and a sample of about 1 g was dried in a convection oven at 150° C. for 1 hour, and the solid content was measured, and as a result, it was confirmed that it was 99.5%. The weight average molecular weight was 23,100 g/mol.

[Preparation Example 2] SLPU-M polymer

100 parts by weight of polyester diol (Songwon Industrial SS-20N, OH value; 57.33 mgKOH/g) was added to the reactor and mixed. After raising the reaction temperature to 70°C, 0.01% by weight of dibutyl tin dilaurate is added and mixed. Add 10 parts by weight of isophorone diisocyanate (IPDI, NCO/OH=0.95) and stir while maintaining the reaction temperature of 82°C. If the NCO peak (2,267 ~ 2,270 cm ^-1 ) is not confirmed using FT-IR, it is used as the end point of the first-step reaction. Lower the reaction temperature to 70°C, add 2.9 parts by weight of 3-Isocyanatopropylmethyl dimethoxysilane (ICPMDMS, NCO/OH=0.05), and stir while maintaining the temperature at 80°C. If the NCO peak is not confirmed using FT-IR, it is used as the end point of the two-step reaction. The temperature was lowered to room temperature, about 1 g of sample was taken, and the solid content was measured in a convection oven at 150° C. for 1 hour, and it was confirmed that it was 99.4%. The weight average molecular weight was 25,320 g/mol.

[Preparation Example 3] SLPU-A polymer

100 parts by weight of polyester diol (Songwon Industrial SS-20N, OH value; 57.33 mgKOH/g) was added to the reactor and mixed. After raising the reaction temperature to 70°C, 0.01 wt% of dibutyl tin dilaurate is added and mixed. MDI (Methylene diphenyl diisocyanate) was added in a molar ratio of NCO/OH=0.95 and stirred while maintaining the reaction temperature of 82°C. If the NCO peak (2,267 ~ 2,270 cm ^-1 ) is not confirmed using FT-IR, it is used as the end point of the first-step reaction. Lower the reaction temperature to 70°C, add 2.9 parts by weight of 3-Isocyanatopropylmethyl dimethoxysilane (ICPMDMS, NCO/OH=0.05), and stir while maintaining the temperature at 80°C. If the NCO peak is not confirmed using FT-IR, it is used as the end point of the two-step reaction. After lowering the temperature to room temperature, taking a sample of about 1 g, and measuring the solid content in a convection oven at 150° C. for 1 hour, it was confirmed that it was 99.7%. The weight average molecular weight was 25,880 g/mol.

[Example 1]

100 parts by weight of SLPU polymer, 7.9 parts by weight of plasticizer (DINCH), 1.1 parts by weight of UV stabilizer (Prosorb UV-292), 1.1 parts by weight of antioxidant (Songnox2450), 16.4 parts by weight of titanium dioxide (R5566), thickener (RHEOTHIX SG 705P) After putting 2.3 parts by weight into the mixing tank, the tank is mounted on a stirrer and stirred for 30 minutes. Then, 200 parts by weight of calcium carbonate and 0.6 parts by weight of calcium oxide are added, mixed, and the vacuum pump is operated, followed by stirring at 90° C. for 30 minutes. Next, add 46.3 parts by weight of DINCH again and proceed with cooling and stirring. Then, after releasing the vacuum, 6.2 parts by weight of a long-term physical property stabilizer (vinyltrimethoxysilane, VTMS) is added, and the vacuum pump is operated and stirred for 30 minutes. Then, 2.3 parts by weight of dibutyltin dilaurate as a curing catalyst is added at 60° C. or less, and the mixture is stirred for 30 minutes. After releasing the vacuum, the mixing tank is quickly removed, the contents are covered with a plastic cover, and then packaged within 30 minutes, and the sealant composition is sealed/packaged in the specified cartridge.

According to ASTM D412 Die C, the sealed sealant composition was put into a jig as shown in FIG. 1 and cured by water crosslinking to prepare a 25.0mm±0.25mm specimen, which was then inserted into a tensile tester and then elongated at a rate of 500mm/min. was measured. After the elastic recovery test specimen was prepared as shown in FIG. 2, elastic recovery properties were measured by the test method of KS F 4910. In addition, adhesion was measured according to the method of ASTM C794. The results are listed in Table 1.

[Example 2]

Example 1 was carried out in the same manner as in Example 1 except that 90 parts by weight of SLPU polymer and 10 parts by weight of SLPU-M polymer were used, and the results are listed in Table 1.

[Example 3]

Example 1 was carried out in the same manner except that 70 parts by weight of SLPU polymer and 30 parts by weight of SLPU-M polymer were used.

[Example 4]

It was carried out in the same manner as in Example except that 50 parts by weight of SLPU polymer and 50 parts by weight of SLPU-M polymer were used.

[Example 5]

It was carried out in the same manner as in Example 4, except that 50 parts by weight of SLPU polymer and 50 parts by weight of SLPU-A polymer were used.

[Example 6]

The same procedure was carried out in Example 4, except that 4.5 parts by weight of aminosilane (DAS) was used as an adhesion imparting agent. The results are listed in Table 1.

adhesion elastic recovery elongation Example 1 1.9N/m 71% 411% Example 2 2.1N/m 81% 752% Example 3 2.0N/m 88% 1,050% Example 4 2.1N/m 95% 1,153% Example 5 1.9N/m 84% 914% Example 6 3.1N/m 94% 1,110%

As can be seen from the above table, the product of the present invention has an elastic restoring force of 70% or more, preferably 80% or more, more preferably 90% or more, and at the same time exhibits excellent properties in adhesive force, and the elongation is It was shown to exhibit excellent elongation of more than 400% good, 700% better, and more than 1000% very good.

In addition, compared to Example 1 when the modified polyurethane resin end-capped with trialkoxysilane in the present invention was used alone, the modified polyurethane resin end-capped with trialkoxysilane and the modified polyurethane resin end-capped with dialkoxysilane In the case of Examples 2 to 4, which are sealant compositions including the mixed-modified polyurethane resin, more remarkable improvements in elastic recovery and elongation were shown, and excellent physical properties were exhibited without any loss in adhesive force.

In addition, in the present invention, compared to Examples 1 to 4 using a cyclic isocyanate, Example 5 using an aromatic diisocyanate instead of a cyclic isocyanate compared to Example 4 having the same composition ratio When having a cyclic isocyanate, in the case of elastic recovery In terms of excellent properties and elongation of 10% or more, an elongation of 100% or more exhibited excellent characteristics.

In addition, in Example 4, it was found that aminosilane as an adhesive imparting agent increased physical properties in terms of elastic recovery and elongation, and at the same time increased adhesion by 50% or more in adhesive strength.

As described above, the present invention has been described with reference to specific matters and limited examples and drawings, but these are only provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments, and the present invention is not limited to the above embodiments. Various modifications and variations are possible from these descriptions by those of ordinary skill in the art.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and not only the claims to be described later, but also all those with equivalent or equivalent modifications to the claims will be said to belong to the scope of the spirit of the present invention. .

Claims (11)

A modified polyurethane resin comprising a first modified polyurethane resin in which both ends of a polyester-based polyurethane diol are end-capped with trialkoxysilane and a second modified polyurethane resin in which both ends of the polyurethane diol are end-capped with alkyldialkoxysilane. , is manufactured including curing catalysts and fillers,
A weight ratio of the first modified polyurethane resin and the second modified polyurethane resin included in the modified polyurethane resin is 90:10 to 50:50. delete The method of claim 1,
In the first modified polyurethane resin, both ends of the polyurethane diol are capped with isocyanatoalkyltrialkoxysilane (NCO-R′-Si(OR ₂ ) ₃ ), and the second modified polyurethane resin is A sealant composition in which both ends of the polyurethane diol are capped with isocyanate alkyldialkoxyalkylsilane (NCO-R'-Si(R″)(OR ₂ ) ₂ ).
(In the above, each of R, R' and R″ is independently a C1-C8 alkyl group.) 4. The method of claim 3,
The capping is a sealant composition capped in the presence of a tin-based catalyst. The method of claim 1,
The sealant composition further comprises a plasticizer. According to any one of claims 1 and 3 to 5 selected from,
The sealant composition further comprises any one or more components selected from a long-term physical property stabilizer and an adhesion imparting agent. 7. The method of claim 6,
The long-term physical property stabilizer is one or more components selected from mono-, di-, or trialkoxysilane compounds having a reactive group selected from a vinyl group, an allyl group, a methacryl group, and an acryl group. 7. The method of claim 6,
The adhesion-imparting agent is a sealant composition comprising a silane compound containing an amine group. The method of claim 1,
The sealant composition comprises 0.01 to 5 parts by weight of a curing catalyst and 1 to 300 parts by weight of a filler based on 100 parts by weight of the modified polyurethane resin. 7. The method of claim 6,
The long-term physical property stabilizer is 1 to 20 parts by weight based on 100 parts by weight of the modified polyurethane resin, and the adhesion imparting agent is 1 to 10 parts by weight of the sealant composition. delete

Images