阅读说明：本技术 一种装配式建筑耐候密封胶及其制备方法 (Fabricated building weather-resistant sealant and preparation method thereof ) 是由 谢辉 谢和理 谢羚南 邱振宇 谢佳言 文志鹏 沈琪琪 于 2021-03-01 设计创作，主要内容包括：本发明公开了一种装配式建筑耐候密封胶,按照重量份数,包括有50～200份端硅烷基改性聚醚聚合物、10～30份交联剂、0.01～0.05份催化剂、10～15份活性支化增塑剂、2～4份复合抗黄变剂、15～45份核壳海藻酸盐微球粒子和80～120无机填料；本发明所采取的技术方案解决了现有的现有的硅烷改性聚醚密封胶耐候性较差,使用一段时间容易发生黄变现象,且在施工时涂刷底涂气味较重的问题。(The invention discloses an assembled building weather-resistant sealant which comprises, by weight, 50-200 parts of a silyl-terminated modified polyether polymer, 10-30 parts of a cross-linking agent, 0.01-0.05 part of a catalyst, 10-15 parts of an active branched plasticizer, 2-4 parts of a composite anti-yellowing agent, 15-45 parts of core-shell alginate microsphere particles and 80-120 parts of an inorganic filler; the technical scheme adopted by the invention solves the problems that the existing silane modified polyether sealant has poor weather resistance, is easy to generate yellowing phenomenon after being used for a period of time, and has heavy odor when being coated with a base coat during construction.)

1. The utility model provides a weather resistant sealant of prefabricated building which characterized in that: the modified polyether polymer comprises, by weight, 50-200 parts of a silyl-terminated modified polyether polymer, 10-30 parts of a cross-linking agent, 0.01-0.05 part of a catalyst, 10-15 parts of an active branching plasticizer, 2-4 parts of a composite anti-yellowing agent, 15-45 parts of core-shell alginate microsphere particles and 80-120 parts of an inorganic filler.

2. The fabricated building weatherable sealant of claim 1, wherein: the modified polyether polymer comprises, by weight, 100-150 parts of a silyl-terminated modified polyether polymer, 15-20 parts of a cross-linking agent, 0.02-0.04 part of a catalyst, 10-12 parts of an active branching plasticizer, 3-4 parts of a composite anti-yellowing agent, 25-40 parts of core-shell alginate microsphere particles and 90-100 parts of an inorganic filler.

3. The fabricated building weatherable sealant of claim 1, wherein: the active branched plasticizer is a branched plasticizer with active carboxyl and hydroxyl, which is prepared by esterification reaction of polyether trihydric alcohol and dibasic acid anhydride according to the mass ratio of 1: 0.1-1.5.

4. The fabricated building weatherable sealant of claim 1, wherein: the composite anti-yellowing agent is a composite anti-yellowing agent of 2, 3-dihydroxy-4-n-decyloxybenzophenone and tris (1,2,2,6, 6-pentamethylpiperidyl) phosphite, and the weight ratio of the 2, 3-dihydroxy-4-n-decyloxybenzophenone to the tris (1,2,2,6, 6-pentamethylpiperidyl) phosphite =1: 0.1-10.

5. The preparation method of the weather-resistant sealant for the fabricated building is characterized by comprising the following steps of:

(1) preparing core-shell alginate microsphere particles for later use;

(2) uniformly mixing 10-15 parts of active branched plasticizer and 80-120 parts of inorganic filler by sanding for 1-3 hours to obtain a mixture;

(3) adding 50-200 parts of silyl-terminated modified polyether polymer, 10-30 parts of cross-linking agent, 0.01-0.05 part of catalyst and 2-4 parts of composite anti-yellowing agent into the mixture obtained in the step (2), and stirring for 2-3 hours in vacuum to obtain an intermediate product;

(4) and (2) adding 15-45 parts of the core-shell alginate microsphere particles prepared in the step (1) into the intermediate product, and stirring for 0.5-1 h in vacuum to obtain the fabricated building weather-resistant sealant.

6. The preparation method of the fabricated weather-resistant sealant according to claim 5, wherein the preparation of the core-shell alginate microsphere particles comprises the following steps:

1) adding 5-10 parts of collagen polypeptide chelated calcium aqueous solution into 1-5 parts of alginate aqueous solution, and adjusting the pH value to 6.5-8.5 to obtain solution A;

2) mixing 1-10 parts of salt solution containing Ca2+ and 1-10 parts of gluconolactone, stirring until the gluconolactone is dissolved, dropwise adding 1.5-2.5 parts of alginate aqueous solution, and adjusting the pH value to 6.5-8.5 to obtain solution B;

3) dropwise adding the solution B while stirring the solution A, continuously stirring and reacting for 3-6 h after dropwise adding, and keeping the reaction temperature at 65-85 ℃; and obtaining the core-shell alginate microsphere particles after the reaction is finished.

7. The method for preparing the fabricated weather-resistant sealant according to claim 6, wherein: the alginate is selected from sodium alginate and potassium alginate.

8. The method for preparing the fabricated weather-resistant sealant according to claim 6, wherein: in the step 3), the stirring speed is 100-300 r/min.

9. The method for preparing the fabricated weather-resistant sealant according to claim 6, wherein: the particle size range of the core-shell alginate microsphere particles is 100-1000 nm.

10. The method for preparing the fabricated weather-resistant sealant according to claim 5, wherein: in the step (3) and the step (4), the vacuum degree reaches more than 0.09MPa during vacuum stirring; and the temperature is kept between 35 and 55 ℃ during vacuum stirring.

Technical Field

The invention relates to the technical field of building sealants, in particular to an assembly type building weather-resistant sealant and a preparation method thereof.

Background

With the development of the construction industry, the traditional construction mode exposes a plurality of defects, such as long construction period, high energy consumption, high pollution, low technical content and the like, which cannot keep pace with the development of cities and do not meet a series of development trends of energy conservation, emission reduction, pollution control and the like. The prefabricated building has the remarkable advantages of low energy consumption, short construction period, stable quality and the like, so that the development of the prefabricated building becomes a necessary trend of the development of modern buildings. Different from the traditional cast-in-place building, the fabricated building is formed by field assembly, so a large number of assembly seams can be left, the seams can easily become permeation channels of water flow, and the problems of wall body moisture and shedding, steel bar corrosion and the like can be caused after water enters, so that the safety performance of the building is seriously influenced.

At present, the waterproof of the assembly type outer wall joint generally adopts a double waterproof technology combining cavity waterproof and material waterproof, the material sealing waterproof is used as a first barrier at the outermost side of the assembly type wall plate joint, and the performance and the construction quality of the material are very important for the waterproof and water-stop performance of a building. The designed width of the joint of the external wall panel of the fabricated building is 15-25 mm, and the physical properties of the sealant, such as mechanical property, compatibility, durability, stain resistance and the like, are different from those of other building sealants according to the characteristics of an application part. With the continuous deepening of environmental awareness, higher requirements are bound to the environmental safety of the sealant. Common sealants include silicone sealant, polyurethane sealant and silane modified polyether sealant; the widely applied silane modified polyether sealant needs to have the capability of bearing certain pressure and the weather resistance capability of bearing weather conditions such as sunlight, temperature, wind and rain, and the like, but the existing silane modified polyether sealant has poor weather resistance, is easy to have a yellowing phenomenon after being used for a period of time, and has heavy odor when being coated with a base coat during construction.

Alginic acid is a natural polysaccharide compound, has the characteristics of rich resources, reproducibility, degradability, good stability, small toxicity, good biocompatibility and the like, and can easily generate ion exchange reaction with high-valence metal ions to form gel. According to the sol-gel and soft and hard acid-base theory, the adsorbent can adsorb fluoride ions, phosphate radicals, nitrate radicals, sulfate radicals and other ions; the particles with the core-shell structure are prepared by taking alginate as a main raw material, more micropores are distributed on the surface of a shell layer, and more adsorptive functional groups are contained in the core layer, so that the specific surface area of the particles of the core-shell alginate microspheres is larger, and acid radical ions in the environment can be adsorbed, therefore, the invention considers that the particles of the alginate microspheres with the core-shell structure are applied to the weather-resistant sealant for the fabricated building.

Disclosure of Invention

The invention aims to provide an assembly type building weather-resistant sealant and a preparation method thereof, and solves the problems that the existing silane modified polyether sealant is poor in weather resistance, easy to generate yellowing phenomenon after being used for a period of time, and heavy in odor when being coated with a base coat during construction.

In order to solve the technical problems, the invention adopts the following technical scheme:

the fabricated building weather-resistant sealant comprises, by weight, 50-200 parts of a silyl-terminated modified polyether polymer, 10-30 parts of a cross-linking agent, 0.01-0.05 part of a catalyst, 10-15 parts of an active branched plasticizer, 2-4 parts of a composite anti-yellowing agent, 15-45 parts of core-shell alginate microsphere particles and 80-120 parts of an inorganic filler;

preferably, the modified polyether polymer comprises, by weight, 100-150 parts of a silyl-terminated modified polyether polymer, 15-20 parts of a cross-linking agent, 0.02-0.04 part of a catalyst, 10-12 parts of an active branching plasticizer, 3-4 parts of a composite anti-yellowing agent, 25-40 parts of core-shell alginate microsphere particles and 90-100 parts of an inorganic filler;

preferably, the active branched plasticizer is a branched plasticizer with active carboxyl and hydroxyl, which is prepared by esterification reaction of polyether triol and dibasic acid anhydride according to the mass ratio of 1: 0.1-1.5;

preferably, the composite anti-yellowing agent is a composite anti-yellowing agent of 2, 3-dihydroxy-4-n-decyloxybenzophenone and tris (1,2,2,6, 6-pentamethylpiperidyl) phosphite, and the weight ratio of the composite anti-yellowing agent to the composite anti-yellowing agent is 2, 3-dihydroxy-4-n-decyloxybenzophenone to tris (1,2,2,6, 6-pentamethylpiperidyl) phosphite =1: 0.1-10.

The invention also provides a preparation method of the fabricated building weather-resistant sealant, which comprises the following steps:

(1) preparing core-shell alginate microsphere particles for later use;

(2) uniformly mixing 10-15 parts of active branched plasticizer and 80-120 parts of inorganic filler by sanding for 1-3 hours to obtain a mixture;

(3) adding 50-200 parts of silyl-terminated modified polyether polymer, 10-30 parts of cross-linking agent, 0.01-0.05 part of catalyst and 2-4 parts of composite anti-yellowing agent into the mixture obtained in the step (2), and stirring for 2-3 hours in vacuum to obtain an intermediate product;

(4) adding 15-45 parts of the core-shell alginate microsphere particles prepared in the step (1) into the intermediate product, and stirring for 0.5-1 h in vacuum to obtain the fabricated building weather-resistant sealant;

further, the preparation of the core-shell alginate microsphere particle comprises the following steps:

1) adding 5-10 parts of collagen polypeptide chelated calcium aqueous solution into 1-5 parts of alginate aqueous solution, and adjusting the pH value to 6.5-8.5 to obtain solution A;

2) mixing 1-10 parts of salt solution containing Ca2+ and 1-10 parts of gluconolactone, stirring until the gluconolactone is dissolved, dropwise adding 1.5-2.5 parts of alginate aqueous solution, and adjusting the pH value to 6.5-8.5 to obtain solution B;

3) dropwise adding the solution B while stirring the solution A, continuously stirring and reacting for 3-6 h after dropwise adding, and keeping the reaction temperature at 65-85 ℃; obtaining core-shell alginate microsphere particles after the reaction is finished;

further, the alginate is selected from one of sodium alginate and potassium alginate;

further, in the step 3), the stirring speed is 100-300 r/min;

further, the particle size range of the core-shell alginate microsphere particles is 100-1000 nm;

in the step (3) and the step (4), the vacuum degree reaches more than 0.09MPa during vacuum stirring; and the temperature is kept between 35 and 55 ℃ during vacuum stirring.

Compared with the prior art, the invention has the beneficial effects that:

1. the core-shell alginate microsphere particles with the core-shell structure are added into the formula of the weather-resistant sealant for the fabricated building, the surfaces of the shell layers of the alginate microsphere particles with the core-shell structure are provided with more micropores, and the shell layers and the core layers respectively contain a large amount of active groups and ions capable of reacting with fluorine ions, acid radical ions and the like, so that the weather-resistant sealant is favorable for improving the acid corrosion resistance in the natural environment, reducing the influence of acid corrosion on the weather-resistant sealant and the service life of building materials and improving the weather resistance of the weather-resistant sealant;

2. the core-shell alginate microsphere particles have a large specific surface area and certain physical adsorption, so that peculiar smell molecules volatilized by the weather-resistant sealant can be adsorbed to a certain degree, and the irritant smell in the coating process can be reduced;

3. the core-shell sodium alginate microsphere particles adopt natural alginate as a main component, the material is cheap and available, and the core-shell sodium alginate microsphere particles are environment-friendly materials and are beneficial to improving the material environmental protection property of the weather-resistant sealant;

4. the active branched plasticizer is added into the formula of the fabricated building weather-resistant sealant, so that the active plasticizing effect is achieved, and meanwhile, due to the effect of functional groups such as carboxyl and the like on the plasticizer, the good dispersing and binding effects of the plasticizer, the sealant matrix and the core-shell alginate microsphere particles are favorably improved, and the sealing effect of the weather-resistant sealant is favorably improved;

5. the composite anti-yellowing agent is added in the formula of the weather-resistant sealant for the fabricated building, and the composite synergistic effect is utilized to widen the wavelength of the benzophenone ultraviolet absorbent to absorb light and improve the conversion efficiency from amino to nitroxyl free radical, thereby being beneficial to improving the yellowing resistance of the sealant and improving the weather resistance of the weather-resistant sealant.

6. After 10000h of manual work, the weather-resistant sealant for the fabricated building provided by the invention has no phenomena of surface cracking, no corrosive peeling and no obvious yellowing.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1: the fabricated building weather-resistant sealant comprises, by weight, 50-200 parts of a silyl-terminated modified polyether polymer, 10-30 parts of a cross-linking agent, 0.01-0.05 part of a catalyst, 10-15 parts of an active branched plasticizer, 2-4 parts of a composite anti-yellowing agent, 15-45 parts of core-shell alginate microsphere particles and 80-120 parts of an inorganic filler;

the core-shell alginate microsphere particles with the core-shell structure are added into the formula of the weather-resistant sealant for the fabricated building, the surfaces of the shell layers of the alginate microsphere particles with the core-shell structure are provided with more micropores, and the shell layers and the core layers respectively contain a large amount of active groups and ions capable of reacting with fluorine ions, acid radical ions and the like, so that the weather-resistant sealant is favorable for improving the acid corrosion resistance in the natural environment, reducing the influence of acid corrosion on the weather-resistant sealant and the service life of building materials and improving the weather resistance of the weather-resistant sealant; the core-shell alginate microsphere particles have a large specific surface area and certain physical adsorption, so that peculiar smell molecules volatilized by the weather-resistant sealant can be adsorbed to a certain degree, and the irritant smell in the coating process can be reduced; the core-shell sodium alginate microsphere particles adopt natural alginate as a main component, the material is cheap and available, and the core-shell sodium alginate microsphere particles are environment-friendly materials and are beneficial to improving the material environmental protection property of the weather-resistant sealant; the active branched plasticizer is added into the formula of the fabricated building weather-resistant sealant, so that the active plasticizing effect is achieved, and meanwhile, due to the effect of functional groups such as carboxyl and the like on the plasticizer, the good dispersing and binding effects of the plasticizer, the sealant matrix and the core-shell alginate microsphere particles are favorably improved, and the sealing effect of the weather-resistant sealant is favorably improved; the composite anti-yellowing agent is added in the formula of the weather-resistant sealant for the fabricated building, and the composite synergistic effect is utilized to widen the wavelength of the benzophenone ultraviolet absorbent to absorb light and improve the conversion efficiency from amino to nitroxyl free radical, thereby being beneficial to improving the yellowing resistance of the sealant and improving the weather resistance of the weather-resistant sealant. After 10000h of manual work, the weather-resistant sealant for the fabricated building provided by the invention has no phenomena of surface cracking, no corrosive peeling and no obvious yellowing.

Preferably, the active branched plasticizer is a branched plasticizer with active carboxyl and hydroxyl, which is prepared by esterification reaction of polyether triol and dibasic acid anhydride according to the mass ratio of 1: 0.1-1.5;

preferably, the composite anti-yellowing agent is a composite anti-yellowing agent of 2, 3-dihydroxy-4-n-decyloxybenzophenone and tris (1,2,2,6, 6-pentamethylpiperidyl) phosphite, and the weight ratio of the composite anti-yellowing agent to the composite anti-yellowing agent is 2, 3-dihydroxy-4-n-decyloxybenzophenone to tris (1,2,2,6, 6-pentamethylpiperidyl) phosphite =1: 0.1-10.

Example 2: the fabricated building weather-resistant sealant comprises, by weight, 100-150 parts of silyl-terminated modified polyether polymer, 15-20 parts of a cross-linking agent, 0.02-0.04 part of a catalyst, 10-12 parts of an active branched plasticizer, 3-4 parts of a composite anti-yellowing agent, 25-40 parts of core-shell alginate microsphere particles and 90-100 parts of an inorganic filler;

preferably, the active branched plasticizer is a branched plasticizer with active carboxyl and hydroxyl, which is prepared by esterification reaction of polyether triol and dibasic acid anhydride according to the mass ratio of 1: 0.1-1.5;

preferably, the composite anti-yellowing agent is a composite anti-yellowing agent of 2, 3-dihydroxy-4-n-decyloxybenzophenone and tris (1,2,2,6, 6-pentamethylpiperidyl) phosphite, and the weight ratio of the composite anti-yellowing agent to the composite anti-yellowing agent is 2, 3-dihydroxy-4-n-decyloxybenzophenone to tris (1,2,2,6, 6-pentamethylpiperidyl) phosphite =1: 0.1-10.

Example 3: the fabricated building weather-resistant sealant comprises, by weight, 50 parts of silyl-terminated modified polyether polymer, 10 parts of a crosslinking agent, 0.01 part of a catalyst, 10 parts of an active branching plasticizer, 2 parts of a composite anti-yellowing agent, 15 parts of core-shell alginate microsphere particles and 80 parts of an inorganic filler;

preferably, the active branched plasticizer is a branched plasticizer with active carboxyl and hydroxyl, which is prepared by esterification reaction of polyether triol and dibasic acid anhydride according to the mass ratio of 1: 0.1-1.5;

preferably, the composite anti-yellowing agent is a composite anti-yellowing agent of 2, 3-dihydroxy-4-n-decyloxybenzophenone and tris (1,2,2,6, 6-pentamethylpiperidyl) phosphite, and the weight ratio of the composite anti-yellowing agent to the composite anti-yellowing agent is 2, 3-dihydroxy-4-n-decyloxybenzophenone to tris (1,2,2,6, 6-pentamethylpiperidyl) phosphite =1: 0.1-10.

Example 4: the fabricated building weather-resistant sealant comprises, by weight, 200 parts of silyl-terminated modified polyether polymer, 30 parts of a crosslinking agent, 0.05 part of a catalyst, 15 parts of an active branching plasticizer, 4 parts of a composite anti-yellowing agent, 45 parts of core-shell alginate microsphere particles and 120 parts of an inorganic filler;

preferably, the active branched plasticizer is a branched plasticizer with active carboxyl and hydroxyl, which is prepared by esterification reaction of polyether triol and dibasic acid anhydride according to the mass ratio of 1: 0.1-1.5;

preferably, the composite anti-yellowing agent is a composite anti-yellowing agent of 2, 3-dihydroxy-4-n-decyloxybenzophenone and tris (1,2,2,6, 6-pentamethylpiperidyl) phosphite, and the weight ratio of the composite anti-yellowing agent to the composite anti-yellowing agent is 2, 3-dihydroxy-4-n-decyloxybenzophenone to tris (1,2,2,6, 6-pentamethylpiperidyl) phosphite =1: 0.1-10.

Example 5: an assembled building weather-resistant sealant comprises, by weight, 125 parts of a silyl-terminated modified polyether polymer, 18 parts of a cross-linking agent, 0.03 part of a catalyst, 10 parts of an active branching plasticizer, 3 parts of a composite anti-yellowing agent, 35 parts of core-shell alginate microsphere particles and 98 parts of an inorganic filler;

preferably, the active branched plasticizer is a branched plasticizer with active carboxyl and hydroxyl, which is prepared by esterification reaction of polyether triol and dibasic acid anhydride according to the mass ratio of 1: 0.1-1.5;

preferably, the composite anti-yellowing agent is a composite anti-yellowing agent of 2, 3-dihydroxy-4-n-decyloxybenzophenone and tris (1,2,2,6, 6-pentamethylpiperidyl) phosphite, and the weight ratio of the composite anti-yellowing agent to the composite anti-yellowing agent is 2, 3-dihydroxy-4-n-decyloxybenzophenone to tris (1,2,2,6, 6-pentamethylpiperidyl) phosphite =1: 0.1-10.

Example 6: a preparation method of the fabricated building weather-resistant sealant comprises the following steps:

(1) preparing core-shell alginate microsphere particles for later use;

(2) uniformly mixing 10-15 parts of active branched plasticizer and 80-120 parts of inorganic filler by sanding for 1-3 hours to obtain a mixture;

(3) adding 50-200 parts of silyl-terminated modified polyether polymer, 10-30 parts of cross-linking agent, 0.01-0.05 part of catalyst and 2-4 parts of composite anti-yellowing agent into the mixture obtained in the step (2), and stirring for 2-3 hours in vacuum to obtain an intermediate product;

(4) adding 15-45 parts of the core-shell alginate microsphere particles prepared in the step (1) into the intermediate product, and stirring for 0.5-1 h in vacuum to obtain the fabricated building weather-resistant sealant;

further, the preparation of the core-shell alginate microsphere particle comprises the following steps:

1) adding 5-10 parts of collagen polypeptide chelated calcium aqueous solution into 1-5 parts of alginate aqueous solution, and adjusting the pH value to 6.5-8.5 to obtain solution A;

2) mixing 1-10 parts of salt solution containing Ca2+ and 1-10 parts of gluconolactone, stirring until the gluconolactone is dissolved, dropwise adding 1.5-2.5 parts of alginate aqueous solution, and adjusting the pH value to 6.5-8.5 to obtain solution B;

3) dropwise adding the solution B while stirring the solution A, continuously stirring and reacting for 3-6 h after dropwise adding, and keeping the reaction temperature at 65-85 ℃; obtaining core-shell alginate microsphere particles after the reaction is finished;

further, the alginate is selected from one of sodium alginate and potassium alginate;

further, in the step 3), the stirring speed is 100-300 r/min;

further, the particle size range of the core-shell alginate microsphere particles is 100-1000 nm;

in the step (3) and the step (4), the vacuum degree reaches more than 0.09MPa during vacuum stirring; and the temperature is kept between 35 and 55 ℃ during vacuum stirring.

Example 7: a preparation method of the fabricated building weather-resistant sealant comprises the following steps:

(1) preparing core-shell alginate microsphere particles for later use;

(2) uniformly mixing 10 parts of active branched plasticizer and 80 parts of inorganic filler by sanding for 1-3 hours to obtain a mixture;

(3) adding 50 parts of silyl-terminated modified polyether polymer, 10 parts of cross-linking agent, 0.01 part of catalyst and 2 parts of composite anti-yellowing agent into the mixture obtained in the step (2), and stirring for 2-3 hours in vacuum to obtain an intermediate product;

(4) adding 15 parts of the core-shell alginate microsphere particles prepared in the step (1) into the intermediate product, and stirring in vacuum for 0.5-1 h to obtain the fabricated building weather-resistant sealant;

further, the preparation of the core-shell alginate microsphere particle comprises the following steps:

1) adding 5 parts of collagen polypeptide chelated calcium aqueous solution into 1 part of alginate aqueous solution, and adjusting the pH value to 6.5-8.5 to obtain solution A;

2) mixing 1 part of salt solution containing Ca2+ and 1 part of gluconolactone, stirring until the gluconolactone is dissolved, dropwise adding 1.5 parts of alginate aqueous solution, and adjusting the pH value to 6.5-8.5 to obtain solution B;

3) dropwise adding the solution B while stirring the solution A, continuously stirring and reacting for 3-6 h after dropwise adding, and keeping the reaction temperature at 65-85 ℃; obtaining core-shell alginate microsphere particles after the reaction is finished;

further, the alginate is selected from one of sodium alginate and potassium alginate;

further, in the step 3), the stirring speed is 100-300 r/min;

further, the particle size range of the core-shell alginate microsphere particles is 100-1000 nm;

in the step (3) and the step (4), the vacuum degree reaches more than 0.09MPa during vacuum stirring; and the temperature is kept between 35 and 55 ℃ during vacuum stirring.

Example 8: a preparation method of the fabricated building weather-resistant sealant comprises the following steps:

(1) preparing core-shell alginate microsphere particles for later use;

(2) uniformly mixing 15 parts of active branched plasticizer and 120 parts of inorganic filler by sanding for 1-3 hours to obtain a mixture;

(3) adding 200 parts of silyl-terminated modified polyether polymer, 30 parts of cross-linking agent, 0.05 part of catalyst and 4 parts of composite anti-yellowing agent into the mixture obtained in the step (2), and stirring for 2-3 hours in vacuum to obtain an intermediate product;

(4) adding 45 parts of the core-shell alginate microsphere particles prepared in the step (1) into the intermediate product, and stirring in vacuum for 0.5-1 h to obtain the fabricated building weather-resistant sealant;

further, the preparation of the core-shell alginate microsphere particle comprises the following steps:

1) adding 10 parts of collagen polypeptide chelated calcium aqueous solution into 5 parts of alginate aqueous solution, and adjusting the pH value to 6.5-8.5 to obtain solution A;

2) mixing 10 parts of salt solution containing Ca2+ and 10 parts of gluconolactone, stirring until the gluconolactone is dissolved, dropwise adding 2.5 parts of alginate aqueous solution, and adjusting the pH value to 6.5-8.5 to obtain solution B;

3) dropwise adding the solution B while stirring the solution A, continuously stirring and reacting for 3-6 h after dropwise adding, and keeping the reaction temperature at 65-85 ℃; obtaining core-shell alginate microsphere particles after the reaction is finished;

further, the alginate is selected from one of sodium alginate and potassium alginate;

further, in the step 3), the stirring speed is 100-300 r/min;

further, the particle size range of the core-shell alginate microsphere particles is 100-1000 nm;

in the step (3) and the step (4), the vacuum degree reaches more than 0.09MPa during vacuum stirring; and the temperature is kept between 35 and 55 ℃ during vacuum stirring.

Example 9: a preparation method of the fabricated building weather-resistant sealant comprises the following steps:

(1) preparing core-shell alginate microsphere particles for later use;

(2) uniformly mixing 10 parts of active plasticizer and 98 parts of inorganic filler by sanding for 1-3 hours to obtain a mixture;

(3) adding 125 parts of silyl-terminated modified polyether polymer, 18 parts of cross-linking agent, 0.03 part of catalyst and 3 parts of composite anti-yellowing agent into the mixture obtained in the step (2), and stirring for 2-3 hours in vacuum to obtain an intermediate product;

(4) adding 35 parts of the core-shell alginate microsphere particles prepared in the step (1) into the intermediate product, and stirring in vacuum for 0.5-1 h to obtain the fabricated building weather-resistant sealant;

further, the preparation of the core-shell alginate microsphere particle comprises the following steps:

1) adding 6 parts of collagen polypeptide chelated calcium aqueous solution into 4 parts of alginate aqueous solution, and adjusting the pH value to 6.5-8.5 to obtain solution A;

2) mixing 8 parts of salt solution containing Ca2+ and 5 parts of gluconolactone, stirring until the gluconolactone is dissolved, dropwise adding 2.5 parts of alginate aqueous solution, and adjusting the pH value to 6.5-8.5 to obtain solution B;

3) dropwise adding the solution B while stirring the solution A, continuously stirring and reacting for 3-6 h after dropwise adding, and keeping the reaction temperature at 65-85 ℃; obtaining core-shell alginate microsphere particles after the reaction is finished;

further, the alginate is selected from one of sodium alginate and potassium alginate;

further, in the step 3), the stirring speed is 100-300 r/min;

further, the particle size range of the core-shell alginate microsphere particles is 100-1000 nm;

in the step (3) and the step (4), the vacuum degree reaches more than 0.09MPa during vacuum stirring; and the temperature is kept between 35 and 55 ℃ during vacuum stirring.

The weather-resistant sealants prepared in examples 6 to 9 were tested for tensile strength, elongation at break, elastic recovery and modulus according to the standards GB/T13477 and GB/T14683, and the appearance was observed after the weather aging was carried out for 10000h, and the obtained results are shown in Table 1 below.

TABLE 1 test results of weather-resistant sealants of examples 6-9

Therefore, the weather-resistant sealant provided by the invention has the advantages of excellent performance, low modulus, high elastic recovery rate, high elongation at break and good weather resistance, and after weather resistance test, the weather-resistant sealant has no obvious yellowing, cracking and peeling, and the environmental acid corrosion condition is obviously improved.

Example 10: control experiment 1 with and without core-shell alginate microspheres

Experimental groups: the weather-resistant sealant is prepared by the following steps:

(1) preparing core-shell alginate microsphere particles for later use;

(2) uniformly mixing 10 parts of active plasticizer and 98 parts of inorganic filler by sanding for 1-3 hours to obtain a mixture;

(3) adding 125 parts of silyl-terminated modified polyether polymer, 18 parts of cross-linking agent, 0.03 part of catalyst and 3 parts of composite anti-yellowing agent into the mixture obtained in the step (2), and stirring for 2-3 hours in vacuum to obtain an intermediate product; the vacuum degree reaches more than 0.09MPa during stirring; and the temperature is kept between 35 and 55 ℃ during vacuum stirring;

(4) adding 35 parts of the core-shell alginate microsphere particles prepared in the step (1) into the intermediate product, and stirring in vacuum for 0.5-1 h to obtain the fabricated building weather-resistant sealant; the vacuum degree reaches more than 0.09MPa during stirring; and the temperature is kept between 35 and 55 ℃ during vacuum stirring;

the preparation method of the core-shell alginate microsphere particles comprises the following steps:

1) adding 6 parts of collagen polypeptide chelated calcium aqueous solution into 4 parts of alginate aqueous solution, and adjusting the pH value to 6.5-8.5 to obtain solution A;

2) mixing 8 parts of salt solution containing Ca2+ and 5 parts of gluconolactone, stirring until the gluconolactone is dissolved, dropwise adding 2.5 parts of alginate aqueous solution, and adjusting the pH value to 6.5-8.5 to obtain solution B;

3) dropwise adding the solution B while stirring the solution A, keeping the stirring speed at 100-300 r/min after dropwise adding, continuously stirring for reacting for 3-6 h, and keeping the reaction temperature at 65-85 ℃; obtaining core-shell alginate microsphere particles after the reaction is finished; sodium alginate is selected as the alginate; the particle size range of the obtained core-shell alginate microsphere particles is 100-1000 nm.

Control group 1: the weather-resistant sealant is prepared by adopting the same formula components and preparation method as the experimental group, and the difference is that core-shell alginate microsphere particles are not added;

control group 2: the weather-resistant sealant is prepared by adopting the same formula components and preparation method as the experimental group, and is characterized in that core-shell alginate microsphere particles are replaced by alginate aqueous solution;

control group 3: the weather-resistant sealant is prepared by adopting the same formula components and preparation method as those of an experimental group, and is characterized in that an active branched plasticizer is not added.

The performance test results of the weather-resistant sealant obtained from the experimental group 1 and the control groups 1 to 3 are shown in the following table 2.

TABLE 2 weather-resistant sealant performance test results of experiment group 1 and control group 1-3

Therefore, the effect of adding the core-shell alginate microsphere particles into the weather-resistant sealant is optimal, and the performance of the weather-resistant sealant is better improved compared with other weather-resistant sealant; the effect of not adding the core-shell alginate microsphere particles is the worst, the weather resistance of the added alginate aqueous solution is poorer than that of the core-shell alginate microsphere particles, and the performance is also weaker than that of the core-shell alginate microsphere particles; the addition of the active branched plasticizer in the formula also has certain influence on the performance and weather resistance of the weather-resistant sealant.

Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.