CN110760285A - Anti-sagging single-component polyurethane sealant for prefabricated building and preparation method thereof - Google Patents
Anti-sagging single-component polyurethane sealant for prefabricated building and preparation method thereof Download PDFInfo
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- CN110760285A CN110760285A CN201910581895.5A CN201910581895A CN110760285A CN 110760285 A CN110760285 A CN 110760285A CN 201910581895 A CN201910581895 A CN 201910581895A CN 110760285 A CN110760285 A CN 110760285A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/08—Polyurethanes from polyethers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
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Abstract
The invention relates to an anti-sagging single-component polyurethane sealant for an assembly type building and a preparation method thereof, wherein the sealant comprises the following components: 100 parts of polyurethane prepolymer, 2-20 parts of prefabricated anti-sagging agent, 10-50 parts of extender filler, 0.1-5 parts of coupling agent and 0.1-5 parts of curing accelerator; the prefabricated anti-sagging agent comprises the following raw materials in parts by weight: 200-300 parts of absolute ethyl alcohol, 20-40 parts of hydrogenated castor oil, 10-15 parts of maleic anhydride and 5-10 parts of zeolite powder; the hydrogenated castor oil is uniformly dispersed in the sealant through esterification modification of the hydrogenated castor oil and the assistant dispersion effect of the carrier, so that the anti-sagging performance of the modified hydrogenated castor oil is fully exerted. The anti-sagging single-component polyurethane sealant for the fabricated building has strong adhesive force to concrete and metal base layers, is weather-proof, has large elongation, low modulus, high deformation displacement resistance and good anti-sagging performance, is suitable for vertical face construction of fabricated building joints, has the characteristics of simple process and easy operation, and can be popularized and applied in the current large environment for the vigorous development of the fabricated building.
Description
Technical Field
The invention relates to the technical field of fabricated buildings, in particular to an anti-sagging single-component polyurethane sealant applied to fabricated buildings and a preparation method thereof.
Background
The prefabricated building refers to a building assembled on a construction site by using prefabricated components. The method is characterized in that a large number of building parts are produced and processed in a workshop, and the types of components mainly comprise: external wall panel, interior wallboard, superimposed sheet, balcony, air conditioner board, stair, precast beam, precast column etc.. The joint treatment of the fabricated concrete building is an important link of the fabricated concrete building, and comprises sealing of gaps between the periphery of a door and window frame and a concrete or brick wall, sealing of joints of building outer walls and the like, wherein the prefabricated outer wall joint building sealant is widely used relatively. The prefabricated outer wall belongs to basicity, porous component and concatenation department need bear great displacement stress, and current assembly type building uses a period back simultaneously, because the assembly seam between the prefabricated wall body of stress effect can slowly increase, and the prefabricated outer wall board is located the outer facade of building, directly is in under the atmospheric environment, and multiple factors including temperature, humidity, sunshine irradiation, earthquake load, building load all can influence its performance, consequently sealed requirement of gluing to precast concrete outer wall board is just higher. In JGJ1-2014 technical Specification for prefabricated concrete structures, the sealant for the prefabricated exterior wall joint building is definitely indicated to have good compatibility with concrete, high bonding strength, good displacement capability, waterproof, weather-proof, flame-retardant and other functions.
The polyurethane sealant is widely applied to the fields of building sealing and the like due to the characteristics of strong bonding property, acid and alkali resistance, organic solvent resistance, excellent mechanical property and the like. However, when the one-component polyurethane sealant is applied to the vertical face caulking of a fabricated building, the anti-sagging performance is poor due to the self weight. Therefore, in order to improve the sag resistance of the one-component polyurethane sealant, a rheology modifier is required. In the prior art, the rheological modifier generally adopts fumed silica, polyamide wax powder and the like as anti-sagging agents (thixotropic agents), the traditional anti-sagging aids are large in addition amount, very high shearing force is required for uniform dispersion during production, the production efficiency is low, the traditional anti-sealant is produced by firstly synthesizing polyurethane prepolymer, mineral powder and thixotropic powder are separately dried in advance and then enter a planetary kettle together with the prepolymer for mixing, the powder drying belongs to a quite troublesome and inefficient process, the dust pollution of workshops is serious, and the production operation is quite troublesome; although the organic swelling clay has good anti-sagging property, the addition of a certain amount of organic bentonite is liable to cause the increase of the modulus of the sealant and the decrease of the elongation, making it difficult to prepare the polyurethane sealant into a low-modulus product, thereby making it impossible to widely use it. Although the hydrogenated castor oil has good anti-sagging performance, the molecular structure of the hydrogenated castor oil is a polyhydroxy substance, so that gel is easily formed when the hydrogenated castor oil is applied to a single-component polyurethane sealant, and meanwhile, the thixotropic performance of the hydrogenated castor oil is obviously reduced under a high-temperature condition; the rheology modifier adopted in the prior art is applied to the single-component polyurethane sealant, and the defect of poor anti-sagging performance caused by the self weight when the single-component polyurethane sealant is applied to the vertical surface caulking of an assembly type building can not be well solved.
Therefore, in view of the deficiencies in the prior art, there is a need for:
(1) provides the anti-sagging single-component polyurethane sealant for the fabricated building, which is suitable for facade construction at different temperatures.
(2) The preparation method of the anti-sagging single-component polyurethane sealant for the fabricated building is simple in process and easy to operate, and the anti-sagging single-component polyurethane sealant for the fabricated building prepared by the preparation method can have the characteristics of good compatibility with fabricated exterior wall concrete at different temperatures, high bonding strength, low modulus and good displacement capacity.
Disclosure of Invention
One of the purposes of the invention is to provide a sag-resistant single-component polyurethane sealant for fabricated buildings, which has good sag resistance, high elongation and low modulus at different temperatures and avoids the defects in the prior art; the invention also aims to avoid the defects in the prior art and provide the preparation method of the anti-sagging single-component polyurethane sealant for the fabricated building, which has the advantages of simple process, strong practicability and easy operation, and the anti-sagging single-component polyurethane sealant for the fabricated building prepared by the preparation method can have the characteristics of good compatibility with the fabricated exterior wall concrete at different temperatures, high bonding strength, good anti-sagging performance, low modulus and good displacement capability;
the purpose of the invention is realized by the following technical scheme:
on one hand, the invention provides an anti-sagging single-component polyurethane sealant for an assembly type building, which comprises the following raw materials in parts by weight:
100 parts of polyurethane prepolymer
1-20 parts of prefabricated anti-sagging agent
10-50 parts of incremental filler
0.1-5 parts of coupling agent
0.1-5 parts of curing accelerator
Preferably, the sag-resistant single-component polyurethane sealant for the fabricated building comprises the following raw materials in parts by weight:
100 parts of polyurethane prepolymer
1-10 parts of prefabricated anti-sagging agent
10-30 parts of incremental filler
0.1-5 parts of coupling agent
0.1-5 parts of curing accelerator
The polyurethane prepolymer is a capped NCO compound obtained by reacting polyether polyol with polyisocyanate, the polyether polyol is 2 of polyether diol and polyether triol, and the number of active isocyanates contained in a unit molecular chain of the polyisocyanate is 2-4.
The prefabricated anti-sagging agent comprises the following raw materials in parts by weight:
200-300 parts of absolute ethyl alcohol
20-40 parts of hydrogenated castor oil
10-15 parts of maleic anhydride
5-10 parts of zeolite powder;
wherein the prefabricated anti-sagging agent is prepared by the following method:
step one, zeolite powder pretreatment: firstly preparing a 4% sodium chloride solution, then adding zeolite powder, stirring to soak the zeolite powder in the sodium chloride solution, standing for 8 hours, fully stirring once every 1 hour, filtering, taking out the zeolite powder, drying in a 100 ℃ oven to constant weight, then transferring into a calcining furnace, calcining for 1 hour at 250 ℃ and calcining for 2 hours at 450 ℃, and circularly calcining for 2 times to finish the pretreatment of the zeolite powder for later use;
step two, esterification modification: dissolving maleic anhydride in absolute ethyl alcohol to prepare a maleic anhydride saturated solution, adding hydrogenated castor oil into a closed reaction kettle, heating to a reflux state, keeping the temperature, stirring and reacting for 4 hours, concentrating the obtained mixture under reduced pressure after the esterification reaction is finished to prepare paste, naturally cooling the prepared paste to room temperature, then sending the paste into a freeze dryer, drying the obtained solid, crushing and grinding the solid into micro powder to prepare modified hydrogenated castor oil;
step three, active dispersion assistance: and (2) putting the prepared modified hydrogenated castor oil into a closed reaction kettle, adding absolute ethyl alcohol, heating to 50-60 ℃, keeping the temperature and stirring for 20min, adding the zeolite powder prepared in the step one, continuously heating to a reflux state, keeping the temperature and stirring for 2h, carrying out reduced pressure concentration on the obtained mixture to recover the ethyl alcohol, sending the concentrated residue into a 55-60 ℃ oven to dry to constant weight, and crushing and grinding the obtained solid to prepare micro powder, namely preparing the prefabricated anti-sagging agent.
Wherein the incremental filler is one or more of calcium carbonate, silica powder, gypsum powder and talcum powder.
Wherein the coupling agent is one or more of gamma-aminopropyltrimethoxysilane, N- β -aminoethyl-gamma-aminopropyltrimethoxysilane, gamma-glycidoxypropyltrimethoxysilane and trioleoyl isopropyl titanate.
Wherein the curing accelerator is one or more of dibutyltin dilaurate, stannous octoate and triethylene diamine catalysts.
On the other hand, the invention also provides a preparation method of the anti-sagging single-component polyurethane sealant for the fabricated building, which comprises the following steps:
step one, preparing raw materials according to the parts by weight;
step two, sequentially adding the polyurethane prepolymer and the prefabricated anti-sagging agent into a double-planet stirring kettle with a high-speed dispersion disc at the temperature of 50-60 ℃, and vacuumizing, mixing and stirring for 15-60 min;
adding the incremental filler, vacuumizing, mixing and stirring for 40-90 min;
and step four, adding a coupling agent and a curing accelerator in sequence, and stirring for 30-60 min under vacuum pumping to obtain the sag-resistant single-component polyurethane sealant for the fabricated building.
The invention is mainly characterized in that a novel anti-sagging agent suitable for being applied to the anti-sagging single-component polyurethane sealant for the fabricated building is designed and applied to the anti-sagging single-component polyurethane sealant for the fabricated building. The anti-sagging agent solves the problem that hydrogenated castor oil is easy to form gel by esterification modification of maleic anhydride, and simultaneously promotes the hydrogenated castor oil to be uniformly dispersed in the single-component polyurethane sealant by the aid of dispersion assistance of the carrier, so that the hydrogenated castor oil can fully exert anti-sagging performance.
The sealant adopting the formula has the advantages of strong bonding and shearing strength to the PC concrete base layer of the fabricated building, strong adhesive force, large elongation, low modulus and high displacement resistance, obviously improves the sagging resistance of the sealant, and is suitable for the vertical face construction of the PC joint of the fabricated building. In addition, the preparation method of the anti-sagging single-component polyurethane sealant for the fabricated building has the characteristics of simple process, strong practicability and easy operation, and can be popularized and applied in the currently developed large environment of the fabricated building.
Detailed Description
The invention is further described with reference to the following examples:
example 1
The embodiment provides a preparation method of a prefabricated anti-sagging agent, which comprises the following raw materials in parts by weight:
200 parts of absolute ethyl alcohol
Hydrogenated castor oil 20 parts
10 portions of maleic anhydride
5 parts of zeolite powder;
the implementation is as follows:
step one, zeolite powder pretreatment: firstly preparing a 4% sodium chloride solution, then adding zeolite powder, stirring to soak the zeolite powder in the sodium chloride solution, standing for 8 hours, fully stirring once every 1 hour, filtering, taking out the zeolite powder, drying in a 100 ℃ oven to constant weight, then transferring into a calcining furnace, calcining for 1 hour at 250 ℃ and calcining for 2 hours at 450 ℃, and circularly calcining for 2 times to finish the pretreatment of the zeolite powder for later use;
step two, esterification modification: dissolving maleic anhydride in absolute ethyl alcohol to prepare a maleic anhydride saturated solution, adding hydrogenated castor oil into a closed reaction kettle, heating to a reflux state, keeping the temperature, stirring and reacting for 4 hours, concentrating the obtained mixture under reduced pressure after the esterification reaction is finished to prepare paste, naturally cooling the prepared paste to room temperature, then sending the paste into a freeze dryer, drying the obtained solid, crushing and grinding the solid into micro powder to prepare modified hydrogenated castor oil;
step three, active dispersion assistance: and (2) putting the prepared modified hydrogenated castor oil into a closed reaction kettle, adding absolute ethyl alcohol, heating to 50 ℃, keeping the temperature and stirring for 20min, adding the zeolite powder prepared in the step one, continuously heating to a reflux state, keeping the temperature and stirring for 2h, carrying out reduced pressure concentration on the obtained mixture to recover the ethyl alcohol, conveying the concentrated residue into a 55 ℃ oven to be dried to constant weight, and crushing and grinding the obtained solid to prepare micro powder, namely preparing the prefabricated anti-sagging agent.
Example 2
The embodiment provides a preparation method of a prefabricated anti-sagging agent, which comprises the following raw materials in parts by weight:
300 portions of absolute ethyl alcohol
Hydrogenated castor oil 40 parts
Maleic anhydride 15 parts
10 parts of zeolite powder;
this example provides a method of preparing a preformed anti-sag agent by:
step one, zeolite powder pretreatment: firstly preparing a 4% sodium chloride solution, then adding zeolite powder, stirring to soak the zeolite powder in the sodium chloride solution, standing for 8 hours, fully stirring once every 2 hours, filtering, taking out the zeolite powder, drying in a 100 ℃ oven to constant weight, then transferring into a calcining furnace, calcining for 1 hour at 250 ℃ and calcining for 2 hours at 450 ℃ in sequence, and circularly calcining for 2 times to finish the pretreatment of the zeolite powder for later use;
step two, esterification modification: dissolving maleic anhydride in absolute ethyl alcohol to prepare a maleic anhydride saturated solution, adding hydrogenated castor oil into a closed reaction kettle, heating to a reflux state, keeping the temperature, stirring and reacting for 5 hours, concentrating the obtained mixture under reduced pressure after the esterification reaction is finished to prepare paste, naturally cooling the prepared paste to room temperature, then sending the paste into a freeze dryer, drying the obtained solid, crushing and grinding the solid into micro powder to prepare modified hydrogenated castor oil;
step three, active dispersion assistance: and (2) putting the prepared modified hydrogenated castor oil into a closed reaction kettle, adding absolute ethyl alcohol, heating to 60 ℃, keeping the temperature and stirring for 30min, adding the zeolite powder prepared in the step one, continuously heating to a reflux state, keeping the temperature and stirring for 2h, carrying out reduced pressure concentration on the obtained mixture to recover the ethyl alcohol, conveying the concentrated residue into a 60 ℃ oven to be dried to constant weight, and crushing and grinding the obtained solid to prepare micro powder, namely preparing the prefabricated anti-sagging agent.
Example 3
An anti-sagging single-component polyurethane sealant for an assembly type building and a preparation method thereof comprise the following raw materials in parts by weight:
isocyanate terminated polyether prepolymer 100 parts
2.5 parts of prefabricated anti-sagging agent
10 portions of calcium carbonate
0.2 portion of gamma-aminopropyl trimethoxy silane
0.2 portion of dibutyltin dilaurate
The isocyanate-terminated polyether prepolymer in the embodiment is a terminated NCO compound obtained by the reaction of polyether diol, polyether triol and polyisocyanate; the number of the active isocyanate contained in the unit molecular chain of the polyisocyanate is 2.5, and the prefabricated anti-sagging agent in the embodiment is prepared in 2.5 parts by the embodiment 1.
The preparation process of the anti-sagging single-component polyurethane sealant for the fabricated building in the embodiment is as follows:
step one, preparing raw materials according to the parts by weight;
step two, sequentially adding 100 parts of isocyanate-terminated polyether prepolymer and 2.5 parts of prefabricated anti-sagging agent into a double-planet stirring kettle with a high-speed dispersion disc at the temperature of 50-60 ℃, and vacuumizing, mixing and stirring for 15-60 min;
adding 10 parts of calcium carbonate, vacuumizing, mixing and stirring for 40-90 min;
and step four, sequentially adding 0.2 part of gamma-aminopropyltrimethoxysilane and 0.2 part of dibutyltin dilaurate, and stirring for 30-60 min under vacuum pumping to obtain the sag-resistant single-component polyurethane sealant for the prefabricated building.
Example 4
An anti-sagging single-component polyurethane sealant for an assembly type building and a preparation method thereof comprise the following raw materials in parts by weight:
isocyanate terminated polyether prepolymer 100 parts
10 portions of prefabricated anti-sagging agent
20 portions of talcum powder
0.2 part of gamma-glycidyl ether oxypropyltrimethoxysilane
Triethylene diamine 0.2 part
The isocyanate-terminated polyether prepolymer in the embodiment is a terminated NCO compound obtained by the reaction of polyether diol, polyether triol and polyisocyanate; the number of the active isocyanate contained in the unit molecular chain of the polyisocyanate is 2.5, and 10 parts of the prefabricated anti-sagging agent in the embodiment is prepared in the embodiment 2.
The preparation process of the anti-sagging single-component polyurethane sealant for the fabricated building in the embodiment is as follows:
step one, preparing raw materials according to the parts by weight;
step two, sequentially adding 100 parts of isocyanate-terminated polyether prepolymer and 10 parts of prefabricated anti-sagging agent into a double-planet stirring kettle with a high-speed dispersion disc at the temperature of 50-60 ℃, and vacuumizing, mixing and stirring for 15-60 min;
step three, adding 20 parts of talcum powder, vacuumizing, mixing and stirring for 40-90 min;
and step four, sequentially adding 0.2 part of gamma-glycidyl ether oxypropyl trimethoxy silane and 0.2 part of triethylene diamine, and stirring for 30-60 min under vacuum pumping to obtain the sag-resistant single-component polyurethane sealant for the fabricated building.
Example 5
An anti-sagging single-component polyurethane sealant for an assembly type building and a preparation method thereof comprise the following raw materials in parts by weight:
isocyanate terminated polyether prepolymer 100 parts
5 parts of prefabricated anti-sagging agent
10 portions of silica powder
1 part of trioleoyl isopropyl titanate
1 part of stannous octoate
The isocyanate-terminated polyether prepolymer in the embodiment is a terminated NCO compound obtained by the reaction of polyether diol, polyether triol and polyisocyanate; the number of the active isocyanate contained in the unit molecular chain of the polyisocyanate is 2.5, and 5 parts of the prefabricated anti-sagging agent in the embodiment is prepared in embodiment 1.
The preparation process of the anti-sagging single-component polyurethane sealant for the fabricated building in the embodiment is as follows:
step one, preparing raw materials according to the parts by weight;
step two, sequentially adding 100 parts of isocyanate-terminated polyether prepolymer and 5 parts of prefabricated anti-sagging agent into a double-planet stirring kettle with a high-speed dispersion disc at the temperature of 50-60 ℃, and vacuumizing, mixing and stirring for 15-60 min;
adding 10 parts of silica powder, vacuumizing, mixing and stirring for 40-90 min;
and step four, sequentially adding 0.2 part of trioleoyl isopropyl titanate and 0.2 part of stannous octoate, and stirring for 30-60 min under vacuum pumping to obtain the sag-resistant single-component polyurethane sealant for the prefabricated building.
Comparative example 1
An anti-sagging single-component polyurethane sealant for an assembly type building and a preparation method thereof comprise the following raw materials in parts by weight:
isocyanate terminated polyether prepolymer 100 parts
10 portions of calcium carbonate
0.2 portion of gamma-aminopropyl trimethoxy silane
0.2 portion of dibutyltin dilaurate
The isocyanate-terminated polyether prepolymer in the embodiment is a terminated NCO compound obtained by the reaction of polyether diol, polyether triol and polyisocyanate; the number of active isocyanate contained in the unit molecular chain of the polyisocyanate is 2.5;
the preparation process of the anti-sagging single-component polyurethane sealant for the fabricated building in the comparative example is as follows:
step one, preparing raw materials according to the parts by weight;
step two, adding 100 parts of isocyanate-terminated polyether prepolymer into a double-planet stirring kettle with a high-speed dispersion disc at the temperature of 50-60 ℃, and vacuumizing, mixing and stirring for 15-60 min;
adding 10 parts of calcium carbonate, vacuumizing, mixing and stirring for 40-90 min;
and step four, sequentially adding 0.2 part of gamma-aminopropyltrimethoxysilane and 0.2 part of dibutyltin dilaurate, and stirring for 30-60 min under vacuum pumping to obtain the sag-resistant single-component polyurethane sealant for the prefabricated building.
Comparative example 2
An anti-sagging single-component polyurethane sealant for an assembly type building and a preparation method thereof comprise the following raw materials in parts by weight:
isocyanate terminated polyether prepolymer 100 parts
2.5 parts of fumed silica
10 portions of calcium carbonate
0.2 portion of gamma-aminopropyl trimethoxy silane
0.2 portion of dibutyltin dilaurate
The isocyanate-terminated polyether prepolymer in the embodiment is a terminated NCO compound obtained by the reaction of polyether diol, polyether triol and polyisocyanate; the number of the active isocyanate contained in the unit molecular chain of the polyisocyanate is 2.5, and the fumed silica in the embodiment is dehydrated and dried for 8 hours at 60 ℃ in another device before use.
The preparation process of the anti-sagging single-component polyurethane sealant for the fabricated building in the embodiment is as follows:
step one, preparing raw materials according to the parts by weight;
step two, sequentially adding 100 parts of isocyanate-terminated polyether prepolymer and 2.5 parts of fumed silica into a double-planet stirring kettle with a high-speed dispersion disc at the temperature of 50-60 ℃, and vacuumizing, mixing and stirring for 15-60 min;
adding 10 parts of calcium carbonate, vacuumizing, mixing and stirring for 40-90 min;
and step four, sequentially adding 0.2 part of gamma-aminopropyltrimethoxysilane and 0.2 part of dibutyltin dilaurate, and stirring for 30-60 min under vacuum pumping to obtain the sag-resistant single-component polyurethane sealant for the prefabricated building.
Table 1 comparative table of performance test results of sag resistant single component polyurethane sealant for prefabricated construction:
relevant test criteria and methods:
the viscosity is measured according to the national standard of GB/T2274-2013 adhesive viscosity.
The bonding shear strength is determined according to the national standard for testing the shear strength of the adhesive GB/T7124-2008.
The displacement resistance grade is determined according to the grading and the requirement of GB/T22083-2008 building sealant.
Tensile modulus was measured according to GB/T13477.8-2002 test method for building sealant part 8 tensile adhesion.
Sag test the sag test was performed according to GB/T13477.3-2002 test method for building sealants, part 3, using standard equipment to determine the extrudability of the sealant.
Embodiments 3 to 5 are the sealant provided by the invention, and as can be seen from table 1, the sag-resistant single-component polyurethane sealant for the fabricated building provided by the invention has the advantages of low modulus, high bonding shear strength and high displacement resistance level. When the addition amount of the prefabricated anti-sagging agent is 2.5 parts, the sagging problem of the sealant is well solved. In contrast, in comparative example 2, the conventional fumed silica was used as an anti-sagging agent, and although the sagging problem was improved, the system viscosity was significantly increased, the sealant modulus was increased, and the adhesive shear strength was significantly lowered.
The present invention has been described in detail, and the embodiments are only for the purpose of facilitating understanding of the method and the core concept of the present invention, and are not intended to limit the scope of the present invention, which is to be understood and interpreted by persons skilled in the art, and all equivalent changes and modifications made in accordance with the spirit of the present invention are intended to be covered by the present invention.
Claims (6)
1. An anti-sagging single-component polyurethane sealant for an assembly type building and a preparation method thereof are characterized by comprising the following raw materials in parts by weight:
100 parts of polyurethane prepolymer
1-20 parts of prefabricated anti-sagging agent
10-50 parts of incremental filler
0.1-5 parts of coupling agent
0.1-5 parts of curing accelerator
The prefabricated anti-sagging agent comprises the following raw materials in parts by weight:
200-300 parts of absolute ethyl alcohol
20-40 parts of hydrogenated castor oil
10-15 parts of maleic anhydride
5-10 parts of zeolite powder;
wherein the preformed anti-sagging agent is prepared by the following method:
step one, zeolite powder pretreatment: firstly preparing a 4% sodium chloride solution, then adding zeolite powder, stirring to soak the zeolite powder in the sodium chloride solution, standing for 8 hours, fully stirring once every 1 hour, filtering, taking out the zeolite powder, drying in a 100 ℃ oven to constant weight, then transferring into a calcining furnace, calcining for 1 hour at 250 ℃ and calcining for 2 hours at 450 ℃, and circularly calcining for 2 times to finish the pretreatment of the zeolite powder for later use;
step two, esterification modification: dissolving maleic anhydride in absolute ethyl alcohol to prepare a maleic anhydride saturated solution, adding hydrogenated castor oil into a closed reaction kettle, heating to a reflux state, keeping the temperature, stirring and reacting for 4 hours, concentrating the obtained mixture under reduced pressure after the esterification reaction is finished to prepare paste, naturally cooling the prepared paste to room temperature, then sending the paste into a freeze dryer, drying the obtained solid, crushing and grinding the solid into micro powder to prepare modified hydrogenated castor oil;
step three, active dispersion assistance: and (2) putting the prepared modified hydrogenated castor oil into a closed reaction kettle, adding absolute ethyl alcohol, heating to 50-60 ℃, keeping the temperature and stirring for 20min, adding the zeolite powder prepared in the step one, continuously heating to a reflux state, keeping the temperature and stirring for 2h, carrying out reduced pressure concentration on the obtained mixture to recover the ethyl alcohol, sending the concentrated residue into a 55-60 ℃ oven to dry to constant weight, and crushing and grinding the obtained solid to prepare micro powder, namely preparing the prefabricated anti-sagging agent.
2. The sag-resistant single-component polyurethane sealant for the fabricated building and the preparation method thereof according to claim 1 are characterized in that: the polyurethane prepolymer is a capped NCO compound obtained by reacting polyether polyol with polyisocyanate, the polyether polyol is 2 of polyether diol and polyether triol, and the number of active isocyanate contained in a unit molecular chain of the polyisocyanate is 2-4.
3. The sag-resistant single-component polyurethane sealant for the fabricated building and the preparation method thereof according to claim 1 are characterized in that: the incremental filler is one or more of calcium carbonate, silica powder, gypsum powder and talcum powder.
4. The anti-sagging one-component polyurethane sealant for the fabricated building and the preparation method thereof as claimed in claim 1, wherein the coupling agent is one or more of gamma-aminopropyltrimethoxysilane, N- β -aminoethyl-gamma-aminopropyltrimethoxysilane, gamma-glycidyloxypropyltrimethoxysilane and isopropyl trioleate titanate.
5. The sag-resistant one-component polyurethane sealant for prefabricated buildings and the preparation method thereof according to claim 1, wherein the curing accelerator is one or more of dibutyltin dilaurate, stannous octoate and triethylenediamine catalyst.
6. The anti-sagging one-component polyurethane sealant for prefabricated buildings as claimed in any one of claims 1 to 5 and the preparation method thereof, wherein the anti-sagging one-component polyurethane sealant comprises the following steps:
step one, preparing raw materials according to the parts by weight;
step two, sequentially adding the polyurethane prepolymer and the prefabricated anti-sagging agent into a double-planet stirring kettle with a high-speed dispersion disc at the temperature of 50-60 ℃, and carrying out vacuum mixing and stirring for 15-60 min;
adding the incremental filler, and mixing and stirring for 40-90 min in vacuum;
and step four, sequentially adding a coupling agent and a curing accelerator, and stirring for 30-60 min under vacuum to obtain the anti-sagging single-component polyurethane sealant for the fabricated building.
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| CN108219705A (en) * | 2018-02-01 | 2018-06-29 | 江兵 | A kind of thixotropic agent for being intended to improve polyurethane sealant sag resistance energy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108219705A (en) * | 2018-02-01 | 2018-06-29 | 江兵 | A kind of thixotropic agent for being intended to improve polyurethane sealant sag resistance energy |
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