CN108148534B

CN108148534B - Double-component silane modified sealant for industrial buildings

Info

Publication number: CN108148534B
Application number: CN201711455603.0A
Authority: CN
Inventors: 李兵; 安云岐; 李雁; 张连英; 李承宇; 杨棕凯
Original assignee: Jiangsu Zhuoqi New Material Technology Co ltd
Current assignee: Jiangsu Zhuoqi New Material Technology Co ltd
Priority date: 2017-12-28
Filing date: 2017-12-28
Publication date: 2021-05-18
Anticipated expiration: 2037-12-28
Also published as: CN108148534A

Abstract

The invention discloses a bi-component silane modified sealant for industrialized buildings, which is divided into a main agent and a curing agent. The main agent part is silane modified polymer resin MS801, and nano calcium, graphene powder, pigment, fumed silica, chopped fibers, a plasticizer, silver powder slurry, a weather-resistant auxiliary agent, water and the like are added; the curing agent part selects catalyst, dodecylamine, nano calcium, pigment, gas-phase silicon dioxide, water, emulsifier and the like; the two components are respectively prepared by a double-planet vacuum stirring processing technology and are mixed according to the proportion of 10:1 for use. The product of the invention has excellent bonding and sealing performance, and solves the problems of insufficient curing strength, poor shearing resistance, poor weather resistance, oil separation of a main agent, layering of a curing agent and the like of the existing product. The invention discloses a construction process of the product on PC building joints, which adopts the technical measures of cleaning, pretreatment, priming coating, frictioning and the like to ensure the reliable waterproof quality of building joint protection, and can create good economic and social benefits.

Description

Double-component silane modified sealant for industrial buildings

Technical Field

The invention relates to a sealing material and a preparation process thereof, in particular to a double-component silane modified sealing agent for industrialized buildings, belonging to the technical field of bonding sealing materials in the building industry.

Background

The industrial building is also called as a fabricated building, and is a concrete structure building which is mainly made of prefabricated concrete members produced in factories and is constructed in a field assembly mode. Compared with the traditional cast-in-place concrete structure building, the cast-in-place concrete structure building has the advantages of six or less, safety, environmental protection, rapidness, high efficiency and the like. The construction mode of the assembly type building is field assembly splicing, so the treatment quality of the joint directly influences the long-term service life and the safe use condition of the whole building. At present, the waterproof of the outer wall joint of the building structure mainly adopts a dual waterproof measure of combining components and materials, wherein, the sealant becomes a first waterproof line, and the performance of the sealant is directly related to the engineering waterproof effect; the concrete building outer wall is influenced by the environment such as sunlight irradiation, wind and rain erosion and the like, and the sealant also has better weather resistance; in addition, the joints of the fabricated concrete building structure are easily affected by load, temperature and the like to generate large deformation, so that the mechanical properties of the sealant, such as low elasticity, high strength, fatigue (load) resistance, strong adhesion and the like, also meet corresponding requirements.

At present, high-performance building sealant mainly comprises: silicones, polyurethanes, polysulfide sealants, and the like. The polysulfide sealant has the advantages of low-temperature curing speed, easy aging and hardening, poor durability, strong pungent smell and gradually quits the industrial application range; the polyurethane sealant has the characteristics of high strength, tear resistance, softness, wear resistance, puncture resistance, oil resistance, medium corrosion resistance and the like, but has the defects of more pores, slower curing speed, poor humidity and heat resistance and aging resistance, poor storage stability and the like; the silicone sealant has the advantages of quick curing, no foaming, strong adhesion, humidity and heat resistance, aging resistance, good storage stability and the like, but has the defects of poor decoration, no painting, low tearing strength, no puncture resistance, easy generation of oily dialysis pollutants in a glue layer and the like.

The silane modified polyether resin sealant has the comprehensive advantages of the sealant, and the market occupancy of the product in Japan sealant is kept about 50 percent since the sealant enters the market and develops rapidly in the 80 th of the 20 th century. Silane modified polyurethane sealant products were also developed in europe and the united states in the 90 s of the 20 th century. In recent years, with the development of the assembly type building industry in China, the silane modified sealant for industrialized buildings gains full attention from the building industry in China.

The Guangzhou white cloud application invention (application number 201610109175.5) discloses a silane modified polyether adhesive for sealing an assembled concrete building, which is prepared from silane-terminated polyether, a plasticizer, an incremental filler, a toner, a thixotropic agent, an ultraviolet absorbent, an ultraviolet stabilizer, a moisture scavenger, an adhesion promoter and a curing agent; the adhesive has good adhesive force to the cement precast slab at normal temperature or after soaking in water, and is suitable for the joint sealing of the fabricated concrete building. When the single-component product is cured, the curing speed is greatly dependent on weather from the surface layer to the inner layer, so that the performance and the use of the single-component product are limited. For example, the elastic recovery rate (B method) of the single-component silane modified sealant is difficult to meet the requirements of the related technical standards.

The invention patent of Beijing Tianshan (ZL 201110299470.9) discloses a two-component silane end-capped sealing adhesive, which comprises a component A and a component B, wherein the component A is composed of silane-containing end-capped prepolymer, a plasticizer, a thixotropic agent, an ultraviolet absorbent, an ultraviolet stabilizer, a moisture scavenger, an accelerator, a curing agent, a coloring agent, an incremental filler and a reinforcing filler; the component B is composed of silane-containing end-capped prepolymer, plasticizer, cocatalyst, surfactant and water absorbent material; wherein, the component A and the component B are mixed according to the proportion of 5: 1 to 49: 1 by weight ratio. By selecting and adjusting the types and the dosages of the catalyst and the cocatalyst in the system, the vulcanization speed and the operation time of the product can be effectively adjusted and controlled, and the dependence on climate is reduced. The introduction of adhesion promoter in the system can make the bi-component sealing adhesive have good adhesion performance to metal or nonmetal substrates, so that the bi-component sealing adhesive can be better applied in various industrial fields. The Guangzhou Baiyun application patent (application No. 201510791224.3) discloses a two-component silane modified polyether sealing material and a preparation method thereof.

The existing two-component silane modified sealant has the defects that the shearing strength and the tearing strength of a vulcanized colloid are low and the performance of resisting the reciprocating change of a sealed joint displacement is greatly reduced due to the influences of factors such as the selection and the proportion of main material components of the sealant, the use of hollow materials (such as hollow resin, hollow glass microspheres and the like), excessive dehydration of a preparation process and the like; the existing two-component silane modified sealant is mainly added with a weather-resistant auxiliary agent to improve the light resistance and heat resistance, but has extremely weak capability of resisting the combined action of rainwater, moisture, high temperature and illumination, and the colloid surface layer is sticky, cracked and even pulverized in a short time, so that great harm is brought to the durability and reliability of the sealing protection of industrial buildings. In addition, the curing agent part of the existing double-component silane modified sealant has the problems of component layering in a short time due to improper selection of a formula material system, proportion and the like, mixing and dissolving among materials, and insufficient solubilizing and adsorbing capacities, so that the dispersion and use of the curing agent are seriously influenced, and the comprehensive performance of the sealant is directly damaged.

Disclosure of Invention

Aiming at the problems and hidden troubles in the prior art, the invention discloses a novel industrial building two-component silane modified sealant, preferably a silane modified polymer resin MS801 specially used in the field of fabricated buildings, and chopped fibers are added to improve the shearing strength and the tearing strength of a colloid; adding trace water to strengthen the internal crosslinking strength of the colloid; introducing silver paste, and shielding water vapor, corrosive medium and ultraviolet light infiltration by means of an anode aluminum metal sheet; the invention also provides a construction process of the two-component silane modified sealant on the joint of a PC building, and the construction process adopts technical measures of cleaning, pretreatment, priming coating, glue scraping and the like to ensure reliable waterproof quality of building joint protection.

The invention is realized by the following technical scheme that the two-component silane modified sealant for the industrialized building is divided into a main agent and a curing agent; the main agent and the curing agent are uniformly mixed according to the weight ratio of 10:1 for use;

the main agent part comprises the following raw materials in parts by weight:

silane modified polyether resin MS S81020-30 parts

40-60 parts of nano calcium carbonate

0.1-0.3 part of graphene powder

0.5-3 parts of fumed silica

Chopped fiber 0.05-0.2 part

15-25 parts of plasticizer

1-10 parts of pigment

0.1-2 parts of silver paste

0.1-0.5 part of ultraviolet absorber

0.1 to 0.5 portion of light stabilizer

0.1 to 0.5 portion of antioxidant

Wherein the curing agent part comprises the following raw materials in parts by weight:

7-15 parts of stannous octoate

1-4 parts of laurylamine

50-80 parts of nano calcium carbonate

0.5-5 parts of fumed silica

10-30 parts of plasticizer

0.01-0.2 parts of phthalocyanine blue.

The main agent part and the curing agent part of the bicomponent silane modified sealant can be respectively added with 0.01-0.2 part of water. In the production process of the sealant, a long-time dispersion process under a vacuum condition is adopted, and the water content in each raw material is originally controlled to be very low, so that the water content of a final product is greatly reduced, the deep curing speed of the mixed sealant is low, the crosslinking strength is low, and the physical and mechanical properties of the sealant cannot reach a better level.

0.02-1 part of emulsifier can be added into the curing agent part, wherein the emulsifier is any one of fatty alcohol-polyoxyethylene ether, sorbitan fatty acid ester and polyoxyethylene sorbitan fatty acid ester, and coupling and stability among the plasticizer, water and various materials in the system are effectively enhanced.

The chopped fiber is any one of carbon fiber and basalt fiber, the length of the chopped fiber is less than 3mm, and the basalt fiber is excellent in quality and low in price, so that the chopped fiber can be preferably used.

The preferable particle size of the graphene powder product is not more than 30 mu m, and the dosage range can be further optimized to be 0.1-0.15 part.

The silver paste is a scaly metal aluminum paste, and preferably, the aluminum paste has a particle size of less than 20 μm and a larger length-diameter ratio.

The silane modified polyether resin MS S810 is an MS silane modified polyether resin produced by Kaneka, Japan, and other component materials are also the prior art in the industry.

A preparation process of the industrial building two-component silane modified sealant adopts a double-planet stirrer with heating, cooling and vacuum facilities for preparation, and comprises the following specific steps:

the preparation method of the main agent part comprises the following steps:

weighing the raw materials according to the material ratio, adding the silane modified polyether resin MS S810 and the plasticizer into a double-planet stirrer, then adding the nano calcium carbonate, the fumed silica, the graphene powder, the pigment, the ultraviolet light absorber, the light stabilizer and the antioxidant, and dispersing at a high speed of 1500rpm for 30-60min under vacuum pumping;

then adding the chopped fibers and the silver powder slurry, and dispersing at medium speed of 500rpm under vacuum for 30-60 min;

continuously vacuumizing for 5-10min, degassing, adding water, and dispersing at 1500rpm for 1-3 min; preparing a main agent, and discharging for later use;

the curing agent part is prepared by the following steps:

weighing the raw materials according to the material ratio, adding a plasticizer and stannous octoate into a cleaned double-planet stirrer, then adding dodecylamine, and dispersing at medium speed of 500rpm under vacuum pumping for 20-30 min;

then adding nano calcium carbonate, fumed silica, phthalocyanine blue and an emulsifier, and dispersing at high speed of 1500rpm under vacuum for 30-60min at 1000-;

continuously vacuumizing for 5-10min, degassing, adding water, and dispersing at 1500rpm for 1-3 min; the curing agent is prepared and discharged for standby;

in the preparation process of the main agent and the curing agent, the planetary stirrer is heated in winter and cooled in summer, and the temperature of materials in the planetary stirrer is controlled to be 30-50 ℃.

A method for using the industrial building two-component silane modified sealant; the method comprises the following specific steps:

firstly, cleaning the surface of a base body, and treating all joint surfaces of a joint area of a splicing piece before the industrial building component is assembled and used, wherein the joint surfaces comprise two side surfaces of an inner wall of a horizontal joint, a vertical joint, a tongue-and-groove joint and a staggered joint, and the following steps are carried out; removing stains on two sides of the surfaces of the inner joint and the outer joint by adopting a physical mechanical or chemical method, wherein the stains comprise loose matters, visible oil stains and obvious release agents, and drying the stains for later use;

secondly, the surface of the cleaned joint is subjected to sealing treatment on the surface of the substrate, and a layer of silane hydrophobing agent or concrete surface hydrophobing agent in the prior art is uniformly brushed or sprayed on the surface of the cleaned joint, so that the joint can be used after being placed for 24 hours; the surface which is sealed and processed cannot be damaged during the placement, the surface can be subjected to rain and water spraying after being sealed for 24 hours, and pollutants such as dust and the like attached to the surfaces of the joints are removed by using semi-dry soft cloth before assembly;

thirdly, after the building component is assembled after 24 hours of base coat sealing treatment on the surface of the base body, checking the surface of a joint, and if the joint is damaged, cleaning and sealing the damaged part again; then according to design requirements, filling rubber strips to a fixed position, shielding and protecting the two outer sides of the joint surface by adopting masking paper or adhesive tapes and the like, uniformly coating a layer of special bottom coating for sealing the PC building joint on the inner walls of the two sides of the joint to be sealed and bonded by adopting a brush coating or spraying mode, wherein the thickness of the bottom coating is not more than 0.1mm, the air drying time is not less than 30min but not more than 8h, and rain, damage or dust pollution cannot be caused in the period; after the rain falls or exceeds 8 hours, the cleaning is needed to be carried out immediately, and the base coat is made again;

and fourthly, after the frictioning base coat is dried, performing frictioning operation as soon as possible, wherein:

inner wall seam treatment: a post-pouring joint is formed, and pouring construction is carried out after a waterproof adhesive tape is adhered to the joint according to the design process; the non-post-cast inner wall joint is processed by referring to the step of scraping the glue of the outer wall joint, the sealant used by the inner wall joint can also be a single-component silane modified sealant, and the indoor decoration operation can be carried out on the surface of the inner wall joint after the maintenance is finished;

and (3) outer wall seam treatment: after the two-component silane modified sealant is uniformly mixed according to the required proportion, a special glue gun is adopted for gluing, so that the sealant in the joint is ensured to be full, continuous and bubble-free; after the glue is applied, a professional scraper blade is adopted to scrape and trim the surface of the seam sealant immediately, and then masking and protecting masking paper or adhesive tape is removed;

and fifthly, after the finished product protection frictioning is finished, the surface of the rubber joint is not required to be touched and trimmed, the rubber joint can stand natural rain but not be touched by external force or foreign matters, and after 24 hours, the protection period is over, and subsequent decoration operations such as painting, beautifying and the like can be performed.

The invention has the beneficial effects that:

according to the invention, the silane modified polymer resin MS801 is preferred, the hollow materials (such as hollow resin and hollow glass) in the prior art are abandoned, and the shear strength and the tear strength of the colloid are obviously improved by adding the chopped fibers; the conventional technology is broken through, the internal crosslinking progress and the mechanical strength of the colloid are ensured and strengthened by adding trace water, and the comprehensive mechanical properties of the colloid such as stretching, shearing resistance and the like are obviously improved and stabilized.

The invention introduces silver paste, and the infiltration of water vapor, corrosive medium and ultraviolet light is shielded by the anode aluminum sheet; the graphene performance strengthening and heat conducting effects are utilized, and the graphene performance strengthening and heat conducting effects are cooperated with an ultraviolet light absorber, an antioxidant, a light stabilizer and an anode metal sheet, so that ultraviolet rays are shielded, heat energy absorbed by the surface layer of a colloid is rapidly transferred to the deep layer, the weather resistance of the colloid is remarkably improved, through ultraviolet aging test comparison, the existing double-component silane modified sealant (Japanese doming) has cracking resistance after 6000h, the product of the invention has no cracking phenomenon after ultraviolet resistance of 8000h, and the comprehensive performance of the product of the invention is outstanding according to the test comparison of the embodiment.

The invention completely adopts nano-scale dispersed materials such as nano calcium carbonate, fumed silica and the like, and simultaneously introduces emulsification auxiliary agent and other comprehensive innovations to solve the problems of oil separation of the main agent and layering of the curing agent, and realizes effective fusion between organic components of the curing agent and water.

The construction process on the PC building joint by adopting the steps of cleaning, pretreatment, priming coating, frictioning and the like is applied to actual engineering, the joint protection waterproof quality is reliable, and the problems of water seepage and water leakage are avoided.

Detailed Description

The present invention will be further described with reference to the following examples.

Examples 1 to 4:

table 1 summarizes the raw material compositions and weight parts of the main agent and the curing agent in examples 1-4, and the performance test data, and compares the data with the prior art. Weighing the materials according to the components and the proportion in the table 1, firstly adding MS801 and a plasticizer into a planetary stirrer, then adding nano calcium carbonate, fumed silica, graphene powder, pigment, an ultraviolet light absorber, a light stabilizer and an antioxidant, and dispersing at a high speed of 1500rpm for 60min under vacuum pumping;

then adding the chopped fibers and the silver powder slurry, and dispersing for 30min at medium speed of 500rpm under the condition of vacuum pumping;

continuously vacuumizing for 10min, degassing, adding water, and dispersing at 1500rpm for 1 min; preparing a main agent, and discharging for later use;

curing agent part:

weighing the materials according to the material ratio, adding a plasticizer and stannous octoate into a cleaned planetary stirrer, then adding dodecylamine, and dispersing at the medium speed of 500rpm for 20-30min under vacuum pumping;

then adding nano calcium carbonate, fumed silica, phthalocyanine blue and an emulsifier, and dispersing at 1500rpm for 60min under vacuum;

continuously vacuumizing for 10min, degassing, adding water, and dispersing at 1500rpm for 1 min; the curing agent is prepared and discharged for standby;

in the preparation process of the main agent and the curing agent, the temperature of the materials in the planetary stirrer is regulated and controlled at the same time, and the temperature of the materials in the planetary stirrer is ensured to be 30-50 ℃.

The main agents in parts by weight: the ratio of the curing agent =10:1, the sample is prepared after being sampled and mixed evenly, the test is carried out according to the relevant national detection standard, the detection data is shown in table 1, and the comparison with the relevant data of the prior art shows that the invention has good effect and achieves the expected target.

The main agent and the curing agent do not have oil separation phenomenon through standing detection, and the curing agent does not have oil separation or oil-water separation phenomenon.

The construction method is applied to engineering construction, and the sealing, bonding, waterproofing and durability effects are good according to the test of the national relevant engineering construction quality standard.

Table 1 examples 1-4 formulation components and test data component units: portions are

。

Claims

1. The industrial building double-component silane modified sealant is characterized in that: the double-component silane modified sealant is divided into a main agent and a curing agent; the main agent and the curing agent are uniformly mixed according to the weight ratio of 10:1 for use;

the main agent part comprises the following raw materials in parts by weight:

the main agent part also contains 0.01-0.2 part of water;

the fiber material is any one of carbon fiber or basalt fiber, and the fiber length is less than 3 mm;

the particle size of the graphene powder is not more than 30 μm;

the silver paste is a scaly metal aluminum paste, and the particle size of an aluminum sheet is less than 20 mu m;

the curing agent part also contains 0.01-0.2 part of water;

the curing agent part also contains 0.02-1 part of emulsifier, and the emulsifier is any one of fatty alcohol-polyoxyethylene ether, sorbitan fatty acid ester and polyoxyethylene sorbitan fatty acid ester;

the preparation process of the double-component silane modified sealant for the industrialized building adopts a double-planet stirrer with heating, cooling and vacuum facilities for preparation, and comprises the following steps:

the main agent part:

weighing the raw materials according to the material ratio, firstly adding silane modified polyether resin MS810 and a plasticizer into a double-planet stirrer, then adding nano calcium carbonate, fumed silica, graphene powder, pigment, an ultraviolet light absorber, a light stabilizer and an antioxidant, and dispersing at a high speed of 1500rpm under vacuum pumping for 30-60 min;

curing agent part:

2. The use method of the industrial building two-component silane modified sealant as claimed in claim 1, is characterized in that: the method comprises the following specific steps: