Preparation process of mildew-proof and antibacterial polyurethane foam joint mixture

Abstract

The invention provides a preparation process of a mildew-proof and antibacterial polyurethane foam joint mixture. The joint mixture is composed of the following components: polyether polyol; an isocyanate; a foaming agent; a catalyst; a stabilizer and an anti-mildew and antibacterial additive; wherein the mildew-proof and antibacterial additive comprises a silver ion compound, quaternary ammonium salt or silicon dioxide nanoparticles, and relates to the technical field of building construction materials, by adding the specific mildew-proof and antibacterial additive, the mildew-proof and antibacterial ability of the polyurethane foam caulking agent in a humid environment is remarkably improved, and the service life of the polyurethane foam caulking agent is prolonged. The material effectively avoids performance reduction and health risks caused by microbial growth, does not generate harmful substances while inhibiting microbial growth, is safe and friendly to human health and environment, and can effectively prevent material aging and prolong the service life of a building structure by inhibiting growth of mould and bacteria. And the modified polyether polyol is adopted as a main base material, so that the adhesion and toughness of the joint mixture are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction materials, and particularly to a preparation process of a mildew and antibacterial polyurethane foam sealant. Background Art

[0002] During the building construction process, in order to ensure the airtightness and watertightness of the building, polyurethane foam sealant is often used for caulking. Polyurethane foam sealant is widely used due to its good filling property, adhesiveness and expansibility.

[0003] However, the existing polyurethane foam sealant has some problems and deficiencies. Especially in a humid and poorly ventilated environment, it is easy to breed mold and bacteria, resulting in the decline of the sealant performance, and even affecting the structural safety of the building and the sanitary condition of the indoor environment.

[0004] The existing polyurethane foam sealant is mainly composed of polyether polyol, isocyanate, foaming agent, catalyst, stabilizer, etc. Although these components can meet the basic caulking requirements, when used in a humid environment, they are easy to absorb moisture and mildew, and do not have antibacterial function. The growth of mold and bacteria not only affects the appearance of the sealant, reduces its physical properties such as strength and adhesiveness, but also may produce harmful volatile organic compounds, affecting human health and accelerating material aging. Therefore, it is urgent to design a mildew and antibacterial polyurethane foam sealant. Summary of the Invention

[0005] In order to overcome the existing problems, the embodiments of the present application provide a preparation process of a mildew and antibacterial polyurethane foam sealant. By adding specific mildew and antibacterial additives, the mildew and antibacterial ability of the polyurethane foam sealant in a humid environment is significantly improved, effectively avoiding the performance decline and health risks caused by microbial growth. While inhibiting the growth of microorganisms, no harmful substances are produced, which is friendly to human health and environmental safety. By inhibiting the growth of mold and bacteria, it can effectively prevent material aging, extend the service life of the building structure, and moreover, modified polyether polyol is used as the main base material to improve the adhesiveness and toughness of the sealant.

[0006] The technical solution adopted by the embodiments of the present application to solve its technical problems is:

[0007] A preparation process of a mildew and antibacterial polyurethane foam sealant, which is composed of the following components: polyether polyol; isocyanate; foaming agent; catalyst; stabilizer and mildew and antibacterial additive;

[0008] Among them, the main components of the foaming agent are propane, butane and dimethyl ether;

[0009] The catalyst adopts an environmentally friendly catalyst, including but not limited to amine catalysts and metal oxide catalysts;

[0010] The polyether polyol uses a modified polyether polyol;

[0011] Among them, the mildew and antibacterial additive includes a silver ion compound, a quaternary ammonium salt or a silicon dioxide nanoparticle;

[0012] Among them, the addition amount of the mildew and antibacterial additive is 0.1%-5% of the total mass of the polyurethane foam sealant.

[0013] Preferably, the specific steps of the preparation process of the mildew and antibacterial type polyurethane foam sealant include:

[0014] Mix the raw materials in the following proportions: polyether polyol, isocyanate, foaming agent, catalyst, stabilizer;

[0015] Mix the above polyether polyol, isocyanate, foaming agent, catalyst and stabilizer under stirring conditions for 10 min to form a polyurethane matrix mixture;

[0016] Add the surface-treated silver ion compound to the matrix mixture and continue stirring for 5 min to ensure that the silver ion compound is evenly dispersed in the mixture;

[0017] Fill the obtained sealant mixture into a spray can. The spray pressure of the spray can is 0.5-2.0 MPa. Place it at room temperature and cool to obtain the finished polyurethane foam sealant. Spray it into the building gap through a spray gun and form a foam sealant layer with mildew and antibacterial functions after natural curing.

[0018] The advantages of the embodiments of the present application are:

[0019] In the present invention, by adding a specific mildew and antibacterial additive, the mildew and antibacterial ability of the polyurethane foam sealant in a humid environment is significantly improved, effectively avoiding the performance decline and health risks caused by microbial growth. While inhibiting the growth of microorganisms, no harmful substances are produced, which is friendly to human health and environmental safety. By inhibiting the growth of mildew and bacteria, the aging of materials can be effectively prevented, the service life of the building structure can be extended, and a modified polyether polyol is used as the main base material to improve the adhesiveness and toughness of the sealant. Description of the Drawings

[0020] Figure 1 It is a schematic process flow diagram of the preparation of the mildew and antibacterial type polyurethane foam sealant of the present invention. Detailed Embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention. In addition, for the convenience of description below, the "upper", "lower", "left", "right", etc. cited are consistent with the upper, lower, left, right, etc. of the accompanying drawings themselves. The "first", "second", etc. in the following text are for descriptive distinction and have no other special meanings.

[0022] By providing a preparation process of a mildew-proof and antibacterial polyurethane foam sealant in the embodiments of the present application, the problems in the prior art are solved. By adding specific mildew-proof and antibacterial additives, the mildew and bacteria resistance of the polyurethane foam sealant in a humid environment is significantly improved, effectively avoiding the performance degradation and health risks caused by microbial growth. While inhibiting the growth of microorganisms, no harmful substances are produced, which is friendly to human health and environmental safety. By inhibiting the growth of mildew and bacteria, the aging of materials can be effectively prevented, and the service life of building structures can be extended. Moreover, a modified polyether polyol is used as the main base material to improve the adhesiveness and toughness of the sealant.

[0023] The technical solutions in the embodiments of the present application for solving the above problems are generally as follows:

[0024] Example 1

[0025] This example provides a preparation process of a mildew-proof and antibacterial polyurethane foam sealant, as Figure 1 shown, the sealant is composed of the following components: polyether polyol; isocyanate; foaming agent; catalyst; stabilizer and mildew-proof and antibacterial additive;

[0026] Among them, the main components of the foaming agent are propane, butane and dimethyl ether;

[0027] The catalyst uses environmentally friendly catalysts, including but not limited to amine catalysts and metal oxide catalysts;

[0028] Among them, the mildew-proof and antibacterial additive includes silver ion compounds, quaternary ammonium salts or silicon dioxide nanoparticles;

[0029] Among them, the addition amount of the mildew-proof and antibacterial additive is 0.1%-5% of the total mass of the polyurethane foam sealant.

[0030] The specific steps of the preparation process of the mildew-proof and antibacterial polyurethane foam sealant include:

[0031] Mix the raw materials in the following proportions: 1000 g of polyether polyol, 300 g of isocyanate, 50 g of foaming agent, 5 g of catalyst, and 10 g of stabilizer;

[0032] Mix 1000 g of the above polyether polyol, 300 g of isocyanate, 50 g of foaming agent, 5 g of catalyst, and 10 g of stabilizer under stirring conditions for 10 min to form a polyurethane matrix mixture;

[0033] Add 3 g of surface-treated silver ion compound to the matrix mixture and continue stirring for 5 min to ensure that the silver ion compound is evenly dispersed in the mixture;

[0034] Fill the obtained sealant mixture into a spray can. The spraying pressure of the spray can is 0.5 - 2.0 MPa. Place it at room temperature and cool to obtain the finished polyurethane foam sealant. Spray it into building joints through a spray gun and form a foam sealant layer with mildew and antibacterial functions after natural curing.

[0035] Example 2

[0036] This example presents a preparation process for a mildew and antibacterial polyurethane foam sealant, as Figure 1 shown. The sealant consists of the following components: modified polyether polyol; isocyanate; foaming agent; catalyst; stabilizer; and mildew and antibacterial additive;

[0037] Among them, the main components of the foaming agent are propane, butane, and dimethyl ether;

[0038] The catalyst uses environmentally friendly catalysts, including but not limited to amine catalysts and metal oxide catalysts;

[0039] The polyether polyol uses a modified polyether polyol;

[0040] Among them, the mildew and antibacterial additive includes silver ion compound, quaternary ammonium salt, or silica nanoparticles;

[0041] Among them, the addition amount of the mildew and antibacterial additive is 0.1% - 5% of the total mass of the polyurethane foam sealant.

[0042] The specific steps of the preparation process for the mildew and antibacterial polyurethane foam sealant include:

[0043] Mix the raw materials in the following proportions: 1000 g of modified polyether polyol, 300 g of isocyanate, 60 g of foaming agent, 6 g of catalyst, and 12 g of stabilizer.

[0044] Mix 1000 g of the above modified polyether polyol, 300 g of isocyanate, 60 g of foaming agent, 6 g of catalyst, and 12 g of stabilizer under stirring conditions for 15 min to form a modified polyurethane matrix mixture.

[0045] Add 5 g of quaternary ammonium salt mildew and antibacterial additive to the matrix mixture, and pretreat it through a special process to improve dispersibility and compatibility. Stir for 10 min to ensure uniform dispersion of the additive.

[0046] Fill the obtained sealant mixture into a spray can. The spray pressure of the spray can is 0.5 - 2.0 MPa. Place it at room temperature and cool to obtain the finished polyurethane foam sealant. When in use, spray it into building joints, and a softer and more mildew and antibacterial foam sealant layer will be formed after curing.

[0047] Example 3

[0048] This example provides a preparation process for a mildew and antibacterial polyurethane foam sealant, as Figure 1 shown. The sealant is composed of the following components: polyether polyol; isocyanate; foaming agent; catalyst; stabilizer and mildew and antibacterial additive;

[0049] Among them, the main components of the foaming agent are propane, butane and dimethyl ether;

[0050] The catalyst uses environmentally friendly catalysts, including but not limited to amine catalysts and metal oxide catalysts;

[0051] Among them, the mildew and antibacterial additive includes silver ion compounds, quaternary ammonium salts or silica nanoparticles;

[0052] Among them, the addition amount of the mildew and antibacterial additive is 0.1% - 5% of the total mass of the polyurethane foam sealant.

[0053] The specific steps of the preparation process for the mildew and antibacterial polyurethane foam sealant include:

[0054] Mix the raw materials in the following proportions: 1000 g of polyether polyol, 300 g of isocyanate, 60 g of foaming agent, 6 g of catalyst, and 12 g of stabilizer.

[0055] Mix 1000 g of the above polyether polyol, 300 g of isocyanate, 60 g of foaming agent, 6 g of catalyst, and 12 g of stabilizer under stirring conditions for 15 min to form a polyurethane matrix mixture;

[0056] Add 5 g of quaternary ammonium salt mildew and antibacterial additive to the matrix mixture, and pretreat it through a special process to improve dispersibility and compatibility. Stir for 10 min to ensure uniform dispersion of the additive;

[0057] The obtained sealant mixture is filled into a spray can. The spraying pressure of the spray can is 0.5 - 2.0 MPa. It is placed at room temperature and cooled to obtain the finished polyurethane foam sealant. When in use, it is sprayed onto building gaps and forms a foam sealant layer that is softer and has stronger mildew and antibacterial capabilities after curing.

[0058] As can be seen from Examples 1 to 3, by changing the type of polyether polyol and the type of mildew and antibacterial additive, sealants with different properties can be achieved to meet the needs of different building constructions. For example, the silver ion compound in Example 1 has good antibacterial properties, while the quaternary ammonium salt in Example 2 has excellent mildew prevention effects in addition to antibacterial properties. Comparing Example 3 with Example 2, the difference lies in whether the polyether polyol is modified. By adjusting the dosages of the blowing agent and the catalyst, the expansibility and curing speed of the sealant can be further optimized.

[0059] These three examples demonstrate the flexibility and broad application prospects of the present invention. Through different raw material selections and formulation adjustments, customized mildew and antibacterial polyurethane foam sealant solutions can be provided for building construction.

[0060] Finally, it should be noted that: Obviously, the above examples are merely illustrations for clearly explaining the present invention and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A mold and mildew resistant polyurethane foam sealant, characterized in that, The caulking agent consists of the following components: polyether polyol; isocyanate; foaming agent; catalyst; stabilizer and mildew and antibacterial additive; Among them, the mildew and antibacterial additive includes silver ion compound, quaternary ammonium salt or silicon dioxide nanoparticles.

2. The anti-mildew and antibacterial polyurethane foam sealant according to claim 1, characterized in that The addition amount of the mildew and antibacterial additive is 0.1%-5% of the total mass of the polyurethane foam caulking agent.

3. The anti-mildew and antibacterial polyurethane foam sealant according to claim 1, characterized in that, The catalyst used is an environmentally friendly catalyst, including but not limited to amine catalysts and metal oxide catalysts.

4. The anti-mildew and antibacterial polyurethane foam caulking agent according to claim 1, characterized in that, The polyether polyol used is a modified polyether polyol.

5. The mold and mildew resistant and antibacterial polyurethane foam sealant according to claim 1, characterized in that, The main components of the foaming agent are propane, butane and dimethyl ether.

6. A preparation process of a mildew-proof and antibacterial polyurethane foam sealant, which is applicable to the mildew-proof and antibacterial polyurethane foam sealant described in claims 1-5, characterized in that, The specific steps of the preparation process of the mildew and antibacterial type polyurethane foam caulking agent include: Step 1, mix the polyether polyol, isocyanate, foaming agent, catalyst and stabilizer evenly; Step 2, add the mildew and antibacterial additive to the mixture; Step 3, fill the mixture into a spray can; Step 4, place it at room temperature and cool to obtain the finished polyurethane foam caulking agent.

7. The preparation process of a mildew-proof and antibacterial polyurethane foam sealant according to claim 6, characterized in that, The spraying pressure of the spray can in Step 3 is 0.5-2.0 MPa.

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