CN112680162A - Sealant and preparation method and application thereof - Google Patents
Sealant and preparation method and application thereof Download PDFInfo
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- CN112680162A CN112680162A CN202011544581.7A CN202011544581A CN112680162A CN 112680162 A CN112680162 A CN 112680162A CN 202011544581 A CN202011544581 A CN 202011544581A CN 112680162 A CN112680162 A CN 112680162A
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Abstract
The invention discloses a sealant and a preparation method thereof, and relates to the technical field of high polymer materials. The sealant comprises a base agent and a hardening agent, wherein the base agent comprises the following components in parts by weight: 80-120 parts of modified silicone resin, 10-40 parts of plasticizer, 2.5-5 parts of aging inhibitor, 10-16 parts of color paste, 1.5-3 parts of thixotropic agent, 15-35 parts of light calcium carbonate, 25-45 parts of heavy calcium carbonate and 1-3 parts of bonding auxiliary agent; the hardening agent comprises the following components in parts by weight: 90-110 parts of plasticizer, 100-125 parts of light calcium carbonate, 20-40 parts of heavy calcium carbonate, 2-6 parts of catalyst and 1-3 parts of bonding auxiliary agent. The sealant prepared by mixing the base agent and the hardening agent is packaged by using double rubber tubes, and when the sealant is used, the two components are uniformly mixed under the action of the helical blades in the mixing tube, so that the defect that the common two-component modified silicone sealant needs to be secondarily mixed by using mixing equipment is overcome. The product has the advantages of convenient construction and the like, and is suitable for waterproof sealing of building joints.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a sealant and a preparation method and application thereof.
Background
The fabricated building is a building in which prefabricated elements are assembled at a construction site. The building has the advantages of higher quality, higher construction speed, lower energy consumption in the construction process, less pollution and the like. The application rate of the assembly type building in developed countries such as Europe, America and Japan reaches more than 70 percent, and the assembly type building becomes a mainstream mode of building development.
The exploration research of the fabricated building is started in China as early as 50-60 years in the 20 th century. But after the 80 s, the prefabricated buildings have gradually grown slightly. The reason for this is mainly two points: firstly, the related technology in China is immature at the moment, and the related matching standard is incomplete; and secondly, the problems of leakage of the outer wall, poor sound insulation and seismic performance and the like are gradually exposed in the use process of the building due to the lack of a proper outer wall joint waterproof process and sealing material, and further development of the fabricated building in China is hindered. After 2015, with the development of science and technology and the increasing of domestic energy-saving and environment-friendly calls, a series of policies for encouraging and promoting the development of prefabricated buildings are issued from the center to governments in various regions, and the prefabricated buildings enter the rapid development period in China.
The joint between the external wall panels of the fabricated building is a dynamic joint, and the size of the joint is constantly changed due to temperature change, wind power, earthquake and drying shrinkage deformation of the panels. At present, a plurality of defense lines are adopted in the waterproof design of the outer wall of the fabricated building, wherein sealing and waterproofing are the first defense line, and various sealants are embedded and filled in seams to form a stable waterproof layer; the second defense line is used for constructing water resistance, and the seam is designed to be suitable for size and structure, so that the acting force of water movement can be reduced; the airtight strip on the inner side of cast-in-place concrete or exterior wall cladding of the shear wall structure belongs to a third defense line.
The modified silicone sealant is a preferred sealing material for sealing the outer wall of the fabricated building due to the properties of good adhesion, excellent weather resistance, good stress relaxation property and displacement resistance, no pollution around seams, surface finishing and the like. At present, in the market of domestic assembled exterior wall sealants, both single-component modified silicone sealants and two-component modified silicone sealants exist, and the single-component modified silicone sealant has the advantages of simple and convenient construction and high construction speed, but has the defects of slow deep curing and large temperature and humidity influence; the two-component modified silicone sealant has the advantages of high deep curing speed, simple color mixing, low-temperature construction and the like, but the construction process is relatively complicated, the construction speed is low, and the surface drying time is long.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the two-component sealant which has short surface drying time, high curing speed, good mechanical property and good bonding property.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the sealant comprises the following components in parts by weight: 80-120 parts of modified silicone resin, 10-40 parts of plasticizer, 2.5-5 parts of aging inhibitor, 10-16 parts of color paste, 1.5-3 parts of thixotropic agent, 15-35 parts of light calcium carbonate, 25-45 parts of heavy calcium carbonate and 1-3 parts of bonding auxiliary agent;
the hardening agent comprises the following components in parts by weight: 90-110 parts of plasticizer, 100-125 parts of light calcium carbonate, 20-40 parts of heavy calcium carbonate, 2-6 parts of catalyst and 1-3 parts of bonding auxiliary agent.
Research shows that when the proportion of each component exceeds the range, the sealant is easy to have the problems of low bonding strength, long surface drying time and the like in the use process, has potential safety hazards when used in the field of buildings, and can increase the construction time; when the sealant prepared according to the proportion is used, the surface drying time is obviously shorter than that of common products on the market; moreover, the bonding effect can still be maintained at a high level.
Preferably, the base agent comprises the following components in parts by weight: 90-110 parts of modified silicone resin, 10-30 parts of plasticizer, 3.4-4.4 parts of aging inhibitor, 12-14 parts of color paste, 1.5-3 parts of thixotropic agent, 20-30 parts of light calcium carbonate, 30-40 parts of heavy calcium carbonate and 1.6-2 parts of bonding auxiliary agent; the hardening agent comprises the following components in parts by weight: 95-105 parts of plasticizer, 105-115 parts of light calcium carbonate, 25-35 parts of heavy calcium carbonate, 3-4 parts of catalyst and 2-2.5 parts of bonding auxiliary agent.
The applicant of the invention optimizes the proportion of the components, so that the surface drying time of the sealant prepared by the proportion is basically maintained within 1h in the using process.
Preferably, the base agent comprises the following components in parts by weight: 100 parts of modified silicone resin, 20 parts of plasticizer, 4.4 parts of aging inhibitor, 14 parts of color paste, 2 parts of thixotropic agent, 30 parts of light calcium carbonate, 30 parts of heavy calcium carbonate and 1.8 parts of bonding auxiliary agent. The hardening agent comprises the following components in parts by weight: 92 parts of plasticizer, 110 parts of light calcium carbonate, 30 parts of heavy calcium carbonate, 4 parts of catalyst and 2 parts of bonding auxiliary agent.
Through multiple experiments, the applicant of the invention finally confirms that the surface drying time of the sealant prepared according to the proportion can be shortened to 0.5h when the sealant is used, and the sealant is equivalent to 1/10 of a common commercial product, and the construction efficiency can be obviously improved.
Preferably, the modified silicone resin comprises at least one of dimethoxy silane terminated polyether resin, trimethoxy silane terminated polyether resin and dimethoxy silane trimethoxy silane mixed terminated polyether resin; the plasticizer comprises a phthalate plasticizer; the aging inhibitor comprises at least one of an antioxidant and a light stabilizer; the bonding auxiliary agent is a silane coupling agent; the catalyst is an organic tin compound.
Preferably, the modified silicone resin is a compound of trimethoxy silane terminated resin and dimethoxy silane terminated resin in a mass ratio of 1 (0.8-1.2). The dimethoxy silane terminated resin has the characteristics of low modulus and high elongation, and the trimethoxy silane terminated resin has the advantages of high curing speed and high elastic recovery rate. The applicant of the invention finds out through experiments that when the modified silicone resin is two materials of trimethoxy silane terminated resin and dimethoxy silane terminated resin, the prepared sealant has better comprehensive performance.
Preferably, the mass ratio of the antioxidant to the light stabilizer in the aging inhibitor is 1 (0.7-1.5), and the addition amount of the aging inhibitor is 0.8-1.2 wt% of the total amount of the base and the hardening agent. The antioxidant can improve the heat resistance of the product, and the light stabilizer can improve the weather resistance of the product by absorbing ultraviolet rays in sunlight. Tests prove that the performance is optimal when the two are added according to the proportion and the addition amount accounts for 1 wt.% of the total amount.
Meanwhile, the invention discloses a preparation method of the sealant, which comprises the following steps:
(1) preparation of a base agent: uniformly mixing the modified silicone resin, the aging inhibitor and the thixotropic agent, then adding the light calcium carbonate and the heavy calcium carbonate, uniformly stirring, then adding the plasticizer and the bonding auxiliary agent, and uniformly stirring to obtain a base agent;
(2) preparation of the hardener: uniformly mixing 1/2-3/5 of plasticizer, light calcium carbonate and heavy calcium carbonate, adding the rest plasticizer, uniformly stirring, finally adding catalyst and bonding auxiliary agent, and uniformly stirring to obtain the hardening agent.
The invention also discloses a use method of the sealant, which comprises the following steps: respectively filling the base agent and the hardening agent of the sealant into two rubber tubes of a packaging tube with double rubber tubes, when in use, uniformly mixing the base agent and the hardening agent in a static mixing tube by extruding a glue gun, and then smearing the uniformly mixed sealant on a position to be sealed; the static mixing pipe is characterized in that a mixing part is arranged in the pipe body of the static mixing pipe and comprises a central shaft, wherein 20-25 spiral blades are arranged on the central shaft at intervals, the spiral blades are spirally arranged clockwise or anticlockwise around the central shaft, the inlet end of the pipe body is connected with the pipe opening of the packing pipe, and the caliber of the outlet end is 10-15 mm.
Preferably, the volume ratio of the base agent to the hardener is 1:1 when used. The applicant of the invention proves through a plurality of experiments that the mixing of the base agent and the hardening agent in a volume ratio of 1:1 has faster curing speed and shorter surface drying time. When the ratio of the base and the curing agent deviates from this ratio, the open time is greatly increased.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the raw materials for preparing the sealant and the proportion thereof are selected, so that the sealant with good weather resistance, durability, adhesion and high curing speed is prepared.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
The main raw materials used in the examples and comparative examples were as follows:
silane-modified polyether resin: dimethoxysilane-terminated polyether resin, industrial product, japan schouin chemical co; trimethoxy silane terminated polyether resin, industrial, Shanghai Dongda chemical Co., Ltd; dimethoxy triethoxy silane mixed end capping polyether resin, industrial product, Ruiyangritai New Material science and technology Co., Ltd;
plasticizer: diisononyl phthalate (DINP), industrial, i Kensinfu, Inc.; polyoxypropylene glycol (PPG2000/PPG3000), Shandong Lanxingdong GmbH;
aging prevention agent: antioxidant 1010, light stabilizers UV326, UV123, industrial products, Technology of New Tianjin Lianlong Material Co., Ltd;
thixotropic agent: hydrophobic gas silicon, industrial, wacker chemistry;
filling: light calcium carbonate, heavy calcium carbonate, industrial products and Dongguan ball nanotechnology;
color paste: industrial, Shanghai Baishi calcium trade company;
silane coupling agent: aminosilane, epoxysilane, mercaptosilane, isocyanatosilane, industrial, Nanjing Needend New Material technology, Inc.;
catalyst: organotin, industrial, chemerin chemical technologies, inc.
Examples 1 to 5
In the embodiments of the sealant, the formula of the base agent and the hardening agent in the embodiments 1 to 5 is shown in tables 1 to 2. The preparation method of the base agent and the hardening agent comprises the following steps:
(1) preparation of a base agent: adding the modified silicone resin, the aging inhibitor and the thixotropic agent into a planetary stirring kettle, stirring for 3-5 min at 10r/min, then adding the light calcium carbonate and the heavy calcium carbonate, stirring for 40-50 min at 25r/min, adding the plasticizer after the light calcium carbonate and the heavy calcium carbonate are uniformly dispersed, and stirring for 10-15 min at 15 r/min; finally, adding the bonding auxiliary agent and the color paste, stirring for 3min at a speed of 15r/min, and stirring for 20-30 min under reduced pressure in vacuum to obtain a base agent;
(2) preparation of the hardener: adding 1/2 plasticizer, light calcium carbonate and heavy calcium carbonate into a planetary stirrer, stirring for 40-50 min at 25r/min, adding the rest plasticizer after uniformly stirring, stirring for 10-15 min at 15r/min, finally adding catalyst and bonding auxiliary agent, stirring for 3min at 25r/min, and stirring for 20-30 min under reduced pressure in vacuum to obtain the hardening agent.
Comparative example 1
A sealant has a formula shown in tables 1-2, and the preparation method is the same as that of example 1.
TABLE 1 base formulation table (parts by weight)
Table 2 hardener recipe table (parts by weight)
Example 6
In one embodiment of the sealant, in the base of the sealant, the modified silicone resin is only dimethoxysilane terminated resin, the amount is 100 parts, and the rest of the formula is the same as that in embodiment 3.
Example 7
In one embodiment of the sealant of the present invention, in the base of the sealant of this embodiment, the modified silicone resin is composed of 30 parts of dimethoxysilane terminated resin and 70 parts of trimethoxy silane terminated resin, and the rest of the formulation is the same as that of embodiment 3.
Example 8
In one embodiment of the sealant of the present invention, in the hardener of the sealant of this embodiment, the plasticizer is DINP only, the amount is 100 parts, and the rest of the formulation is the same as that of embodiment 3.
Example 9
In an embodiment of the sealant of the present invention, in the hardener of the sealant of the present embodiment, the plasticizer is only PPG2000, and the amount is 100 parts, and the rest of the formula is the same as that of the embodiment 3.
Example 10
In an embodiment of the sealant, the antioxidant 1010 and the light stabilizer UV-326 are used as anti-aging agents in the base of the sealant, the amount of the antioxidant 1010 is 2 parts, and the amount of the light stabilizer UV-326 is 0.5 part.
Examples 11 to 20
In examples 11 to 20, the base agent and the hardening agent of the sealant prepared in examples 1 to 10 were filled in a packing tube, the packing tube had two rubber tubes with completely the same shape and structure, the number of spiral blades in the static mixing tube was 24, and the diameter was 13mm, and the packing tube was squeezed with a glue gun to allow the base agent and the hardening agent to enter the static mixing tube and to be mixed uniformly, and then the mixture was extruded from the outlet end of the static mixing tube. The samples were subjected to performance tests according to the specifications in GB/T14683-2017, and the test results are shown in tables 3-4.
Comparative example 2
The application method of comparative example 1 is the same as that of example 11, and the performance test is performed by the methods of examples 11 to 20, and the test results are shown in tables 3 to 4.
TABLE 3
Note: the sag test is referred to the SUNSTAR enterprise internal standard: at 23 ℃, the sealant is filled in a cylindrical cavity with the diameter of 3.6cm and the depth of 2.0cm, the sealant is extruded after being strickled off, the sealant is vertically placed, the sealant naturally sags under the action of gravity, and the sag distance is tested for 10 min.
TABLE 4
As can be seen from tables 3-4, the surface drying time and the complete curing time of the two-component modified silicone sealant are obviously superior to those of the traditional two-component silicone products sold on the market, and the two-component modified silicone sealant is suitable for projects with short construction periods.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. The sealant is characterized by comprising a base agent and a hardening agent, wherein the base agent comprises the following components in parts by weight: 80-120 parts of modified silicone resin, 10-40 parts of plasticizer, 2.5-5 parts of aging inhibitor, 10-16 parts of color paste, 1.5-3 parts of thixotropic agent, 15-35 parts of light calcium carbonate, 25-45 parts of heavy calcium carbonate and 1-3 parts of bonding auxiliary agent; the hardening agent comprises the following components in parts by weight: 90-110 parts of plasticizer, 100-125 parts of light calcium carbonate, 20-40 parts of heavy calcium carbonate, 2-6 parts of catalyst and 1-3 parts of bonding auxiliary agent.
2. The sealant of claim 1 wherein said base comprises the following components in parts by weight: 90-110 parts of modified silicone resin, 10-30 parts of plasticizer, 3.4-4.4 parts of aging inhibitor, 12-14 parts of color paste, 1.5-3 parts of thixotropic agent, 20-30 parts of light calcium carbonate, 30-40 parts of heavy calcium carbonate and 1.6-2 parts of bonding auxiliary agent; the hardening agent comprises the following components in parts by weight: 95-105 parts of plasticizer, 105-115 parts of light calcium carbonate, 25-35 parts of heavy calcium carbonate, 3-4 parts of catalyst and 2-2.5 parts of bonding auxiliary agent.
3. The sealant of claim 2 wherein said base comprises the following components in parts by weight: 100 parts of modified silicone resin, 20 parts of plasticizer, 4.4 parts of aging inhibitor, 14 parts of color paste, 2 parts of thixotropic agent, 30 parts of light calcium carbonate, 30 parts of heavy calcium carbonate and 1.8 parts of bonding auxiliary agent; the hardening agent comprises the following components in parts by weight: 92 parts of plasticizer, 110 parts of light calcium carbonate, 30 parts of heavy calcium carbonate, 4 parts of catalyst and 2 parts of bonding auxiliary agent.
4. The sealant of claim 1 wherein the modified silicone resin comprises at least one of a dimethoxysilane terminated polyether resin, a trimethoxysilane terminated polyether resin, a dimethoxysilane trimethoxysilane mix terminated polyether resin; the plasticizer comprises a phthalate plasticizer; the aging inhibitor comprises at least one of an antioxidant and a light stabilizer; the bonding auxiliary agent comprises a silane coupling agent; the catalyst comprises an organotin compound.
5. The sealant according to claim 4, wherein the modified silicone resin is a compound of trimethoxy silane terminated resin and dimethoxy silane terminated resin in a mass ratio of 1 (0.8-1.2).
6. The sealant according to claim 4, wherein the mass ratio of the antioxidant to the light stabilizer in the aging inhibitor is 1 (0.7-1.5).
7. A method for preparing the sealant according to any one of claims 1 to 6, which comprises the following steps:
(1) preparation of a base agent: uniformly mixing the modified silicone resin, the aging inhibitor, the color paste and the thixotropic agent, then adding the light calcium carbonate and the heavy calcium carbonate, uniformly stirring, adding the plasticizer and the bonding auxiliary agent, and uniformly stirring to obtain a base agent;
(2) preparation of the hardener: uniformly mixing 1/2-3/5 of plasticizer, light calcium carbonate and heavy calcium carbonate, adding the rest plasticizer, uniformly stirring, finally adding catalyst and bonding auxiliary agent, and uniformly stirring to obtain the hardening agent.
8. The use method of the sealant according to any one of claims 1 to 6, characterized in that the base agent and the hardening agent of the sealant are respectively filled into two rubber tubes of a packaging tube with double rubber tubes, when in use, the base agent and the hardening agent are uniformly mixed in a static mixing tube by an electric two-component glue gun, and then the uniformly mixed sealant is smeared on a part needing sealing; the static mixing pipe is characterized in that a mixing part is arranged in the pipe body of the static mixing pipe and comprises a central shaft, wherein 20-25 spiral blades are arranged on the central shaft at intervals, the spiral blades are spirally arranged clockwise or anticlockwise around the central shaft, the inlet end of the pipe body is connected with the pipe opening of the packing pipe, and the caliber of the outlet end is 10-15 mm.
9. The method for using the sealant according to claim 8, wherein the two rubber tubes of the packing tube have the same shape and structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011544581.7A CN112680162B (en) | 2020-12-23 | 2020-12-23 | Sealant and preparation method and application thereof |
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| CN202011544581.7A CN112680162B (en) | 2020-12-23 | 2020-12-23 | Sealant and preparation method and application thereof |
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| CN112680162A true CN112680162A (en) | 2021-04-20 |
| CN112680162B CN112680162B (en) | 2023-04-14 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107892900A (en) * | 2017-12-01 | 2018-04-10 | 北京东方雨虹防水技术股份有限公司 | Single component silane modified polyether seal glue of the low high resilience of modulus and preparation method thereof |
| CN207371371U (en) * | 2017-10-25 | 2018-05-18 | 上海欧堪电子科技有限公司 | Two-component adhesive mixing tube |
| CN110105907A (en) * | 2019-04-18 | 2019-08-09 | 广州集泰化工股份有限公司 | A kind of vehicle glass quick assembling one-component silane modified polyether seal glue and preparation method thereof |
| CN110951435A (en) * | 2019-12-13 | 2020-04-03 | 成都硅宝科技股份有限公司 | High-strength silane modified polyether sealant with equal proportion and preparation method thereof |
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2020
- 2020-12-23 CN CN202011544581.7A patent/CN112680162B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207371371U (en) * | 2017-10-25 | 2018-05-18 | 上海欧堪电子科技有限公司 | Two-component adhesive mixing tube |
| CN107892900A (en) * | 2017-12-01 | 2018-04-10 | 北京东方雨虹防水技术股份有限公司 | Single component silane modified polyether seal glue of the low high resilience of modulus and preparation method thereof |
| CN110105907A (en) * | 2019-04-18 | 2019-08-09 | 广州集泰化工股份有限公司 | A kind of vehicle glass quick assembling one-component silane modified polyether seal glue and preparation method thereof |
| CN110951435A (en) * | 2019-12-13 | 2020-04-03 | 成都硅宝科技股份有限公司 | High-strength silane modified polyether sealant with equal proportion and preparation method thereof |
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