Manufacturing process of single-component polyurethane waterproof coating

Abstract

The invention belongs to the technical field of waterproof coatings, and discloses a single-component polyurethane waterproof coating manufacturing process, and the single-component polyurethane waterproof coating is prepared from the following raw materials by weight: 20-35 parts of polyisocyanate (MDI), 40-60 parts of polyether polyol, 3-8 parts of a chain extender, 0.1-0.5 part of a catalyst, 0.5-1.5 parts of an antifoaming agent, 5-15 parts of a solvent, and 10-20 parts of a filler. The manufacturing process comprises the following steps: automatically proportioning, accurately weighing polyether polyol, a chain extender and a catalyst according to a preset formula, conveying the weighed raw materials to a reaction kettle, stirring and dispersing, heating, dispersing and dehydrating, carrying out moisture detection, and dropwise adding MDI to carry out constant-temperature reaction after the moisture content meets the requirement, so as to obtain the polyether polyol. After cooling, an auxiliary agent and solvent oil are manually added for secondary constant-temperature reaction, secondary stirring and dispersing are performed, secondary cooling is performed, appearance inspection is performed, and finally automatic filling is performed; and dust collection and waste gas treatment are carried out in the processes of automatic batching and dispersion dehydration. The production efficiency is high, and the product quality is stable.

Description

Technical Field

[0001] The invention relates to the technical field of waterproof coatings, in particular to a manufacturing process of a single-component polyurethane waterproof coating. Background Art

[0002] Single-component polyurethane waterproof coatings are widely used in building waterproofing projects due to their excellent elasticity, water resistance, weather resistance and adhesion. However, traditional manufacturing processes often have some problems, such as the reaction process is difficult to control, which can easily lead to unstable product performance, such as uneven curing speed, tensile strength and elongation at break, etc., and more harmful volatiles may be generated during the production process, which has an adverse effect on the environment and the health of operators. Summary of the invention

[0003] The object of the present invention is to provide a one-component polyurethane waterproof coating manufacturing process to solve the above problems.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a one-component polyurethane waterproof coating manufacturing process, wherein the one-component polyurethane waterproof coating is made of the following raw materials in parts by weight: 20-35 parts of polyisocyanate (MDI), 40-60 parts of polyether polyol, 3-8 parts of chain extender, 0.1-0.5 parts of catalyst, 0.5-1.5 parts of defoamer, 5-15 parts of solvent, and 10-20 parts of filler; the manufacturing process comprises the following steps: automatic batching, accurately weighing polyether polyol, chain extender, and catalyst according to a preset formula, conveying the weighed raw materials to a reactor, and then stirring and dispersing, heating and dispersing and dehydrating, and then performing moisture detection, after the moisture content meets the requirements, dropping MDI for constant temperature reaction, cooling down, and then manually adding additives and solvent oil for secondary constant temperature reaction, and then performing secondary stirring and dispersion and secondary cooling, performing appearance inspection, and finally performing automatic filling; in the automatic batching and dispersion and dehydration processes, dust collection and exhaust gas treatment are performed.

[0005] Furthermore, the automatic batching process includes accurately weighing polyether polyol, chain extender, filler, and catalyst raw materials according to a preset formula through a weight sensor, wherein the amount of polyether polyol is 40-60 parts by weight, the chain extender is 3-8 parts by weight, the catalyst is 0.1-0.5 parts by weight, and the filler is 10-20 parts by weight. The weighing error of each raw material is within ±0.5%, and the weighed raw materials are transported to the reactor.

[0006] Furthermore, in the stirring and dispersing step, the raw materials in the reaction kettle are stirred and dispersed at a speed of 200-400 rpm for 10-20 minutes, so that the raw materials are fully mixed to form a uniform mixture.

[0007] Furthermore, the heating dispersion dehydration process includes heating the reactor to raise the temperature in the reactor to 100-120°C at a heating rate of 5-10°C / min, and continuously stirring, dispersing and dehydrating at this temperature for 1-3 hours to fully evaporate the water in the raw materials.

[0008] Furthermore, the moisture detection process includes using a high-precision moisture detector to detect the moisture content of the material after the heating, dispersion and dehydration process in the reactor. When the moisture content is lower than 0.05%, the next step can be entered; if the moisture content is higher than this standard, the heating and dehydration operation will continue.

[0009] Furthermore, the step of dropping MDI for constant temperature reaction includes slowly dropping MDI into the reactor, the amount of MDI is 20-35 parts by weight, the dropping time is controlled at 30-60 minutes, and the temperature in the reactor is maintained at 60-80° C. After the dropping is completed, the constant temperature reaction is continued at this temperature for 2-4 hours to allow MDI to fully react with the previous mixture.

[0010] Furthermore, the process of manually adding auxiliary agents and solvent oil for secondary constant temperature reaction includes manually adding 0.5-1.5 parts by weight of defoamer, 0.3-1.5 parts by weight of leveling agent and 5-15 parts by weight of solvent oil into the reactor, and reacting at a constant temperature of 50-70° C. with stirring for 1-2 hours to fully blend the auxiliary agents and solvent oil with the raw materials.

[0011] Furthermore, the secondary stirring and dispersing process includes stirring and dispersing at a rotation speed of 300-500 rpm for 20-30 minutes to further improve the uniformity of the product.

[0012] Furthermore, the secondary cooling process includes cooling the reactor using a circulating water cooling system to reduce the temperature inside the reactor to 30-40°C.

[0013] Furthermore, in the automatic batching process, a multi-stage filtering device is used for dust collection, and in the dispersion and dehydration process, vacuuming is used to extract waste gas and condense and recover it.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The production process of the present invention is reasonably designed, with high production efficiency and stable product quality. The tensile strength can reach 1.5-3MPa, the elongation at break can reach 300%-500%, the viscosity is moderate, and the solid content meets the standard requirements;

[0016] 2. The production process has a high degree of automation, which reduces manual errors and improves production efficiency. Compared with traditional processes, production efficiency can be increased by 20-30%;

[0017] 3. Accurate moisture control and reasonable connection of each process effectively avoid product quality problems caused by factors such as moisture, and the product qualification rate can reach more than 96%. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] See also Figure 1The present invention provides a one-component polyurethane waterproof coating manufacturing process, wherein the one-component polyurethane waterproof coating is made of the following raw materials in parts by weight: 20-35 parts of polyisocyanate (MDI), 40-60 parts of polyether polyol, 3-8 parts of chain extender, 0.1-0.5 parts of catalyst, 0.5-1.5 parts of defoamer, 5-15 parts of solvent, and 10-20 parts of filler; the manufacturing process comprises the following steps: automatic batching, accurately weighing polyether polyol, chain extender, and catalyst according to a preset formula, conveying the weighed raw materials to a reactor, and then stirring and dispersing, heating and dispersing and dehydrating, and then performing moisture detection, after the moisture content meets the requirements, dropping MDI for constant temperature reaction, cooling down, manually adding auxiliary agents and solvent oil for secondary constant temperature reaction, and then performing secondary stirring and dispersion and secondary cooling, performing appearance inspection, and finally performing automatic filling; in the automatic batching and dispersion and dehydration steps, dust collection and exhaust gas treatment are performed.

[0023] In some embodiments, the automatic batching process includes accurately weighing polyether polyol, chain extender, filler, and catalyst raw materials according to a preset formula through a weight sensor, wherein the amount of polyether polyol is 40-60 parts by weight, the chain extender is 3-8 parts by weight, the catalyst is 0.1-0.5 parts by weight, and the filler is 10-20 parts by weight, and the weighing error of each raw material is within ±0.5%, and the weighed raw materials are transported to the reactor. The polyisocyanate is diphenylmethane diisocyanate (MDI); the polyether polyol is polyoxypropylene glycol with a molecular weight of 2000-4000; the chain extender is 1,4-butanediol; the catalyst is dibutyltin dilaurate; the defoamer is a silicone defoamer; the solvent is xylene; and the filler is calcium carbonate.

[0024] In some embodiments, the stirring and dispersing step is to stir and disperse the raw materials in the reactor at a speed of 200-400 rpm for 10-20 minutes, so that the raw materials are fully mixed to form a uniform mixture.

[0025] In some embodiments, the heating dispersion dehydration process includes heating the reactor to increase the temperature in the reactor to 100-120°C at a heating rate of 5-10°C / min, and continuously stirring, dispersing and dehydrating at this temperature for 1-3 hours to fully evaporate the water in the raw materials.

[0026] In some embodiments, the moisture detection process includes using a high-precision moisture detector to detect the moisture content of the material after the heating, dispersion and dehydration process in the reactor. When the moisture content is lower than 0.05%, the next step can be entered; if the moisture content is higher than this standard, the heating and dehydration operation will continue.

[0027] In some embodiments, the step of adding MDI for constant temperature reaction includes slowly adding MDI to the reactor, the amount of MDI is 20-35 parts by weight, the adding time is controlled at 30-60 minutes, and the temperature in the reactor is maintained at 60-80°C. After the addition is completed, the constant temperature reaction is continued at this temperature for 2-4 hours to allow MDI to fully react with the previous mixture.

[0028] In some embodiments, the process of manually adding auxiliary agents and solvent oil for secondary constant temperature reaction includes manually adding 0.5-1.5 parts by weight of defoaming agent, 0.3-1.5 parts by weight of leveling agent and 5-15 parts by weight of solvent oil into the reactor, and stirring the reaction at a constant temperature of 50-70°C for 1-2 hours to allow the auxiliary agents and solvent oil to be fully integrated with the raw materials.

[0029] In some embodiments, the secondary stirring and dispersing process includes stirring and dispersing at a speed of 300-500 rpm for 20-30 minutes to further improve the uniformity of the product.

[0030] In some embodiments, the secondary cooling process includes cooling the reactor using a circulating water cooling system to reduce the temperature inside the reactor to 30-40°C.

[0031] In some embodiments, a multi-stage filtering device is used for dust collection in the automatic batching process, and a vacuum is used for waste gas extraction and condensation recovery in the dispersion and dehydration process, which effectively reduces toxic and harmful substances in the production process and ensures environmental safety.

[0032] Specific embodiment 1: In the automatic batching process, set the polyether polyol to 45 parts by weight, the chain extender to 5 parts by weight, the catalyst to 0.15 parts by weight, and the filler to 16 parts. After completing the automatic batching, stir in the reactor at 300 rpm for 15 minutes. Heat to 110°C for dehydration for 2 hours. After the moisture test is qualified, 30 parts by weight of MDI are added dropwise for 45 minutes and reacted at 70°C for 3 hours. Manually add 1 part by weight of defoamer, 1 part by weight of leveling agent and 10 parts by weight of solvent oil to react at 60°C for 1.5 hours, then stir at 400 rpm for 25 minutes and cool to 35°C. Fill after testing all performance indicators. The product was tested, and the tensile strength was 2.25MPa, the elongation at break was 472%, and the viscosity and other indicators also met the requirements.

[0033] Example 2: In the automatic batching process, set the polyether polyol to 60 parts by weight, the chain extender to 8 parts by weight, the catalyst to 0.5 parts by weight, and the filler to 10 parts. After completing the automatic batching, stir in the reactor at 400 rpm for 20 minutes. Heat to 100°C for dehydration for 3 hours. After the moisture test is qualified, 35 parts by weight of MDI are added dropwise for 60 minutes and reacted at 80°C for 2 hours. Manually add 1.5 parts by weight of defoamer, 1.5 parts by weight of leveling agent and 10 parts by weight of solvent oil to react at 70°C for 1 hour, then stir at 500 rpm for 20 minutes and cool to 40C. Fill after testing all performance indicators. The product was tested and the tensile strength was 2.1MPa, the elongation at break was 420%, and the viscosity and other indicators also met the requirements.

[0034] Example 3: In the automatic batching process, set the polyether polyol to 40 parts by weight, the chain extender to 3 parts by weight, the catalyst to 0.1 parts by weight, and the filler to 20 parts. After completing the automatic batching, stir in the reactor at 200 rpm for 20 minutes. Heat to 120°C for dehydration for 1 hour. After passing the moisture test, add 20 parts by weight of MDI for 30 minutes and react at 60°C for 4 hours. Manually add 0.5 parts by weight of defoamer, 0.3 parts by weight of leveling agent and 5 parts by weight of solvent oil to react at 50°C for 2 hours, then stir at 300 rpm for 30 minutes and cool to 30C. Fill after testing all performance indicators. The product was tested, and the tensile strength was 2.56MPa, the elongation at break was 468%, and the viscosity and other indicators also met the requirements.

[0035] In summary, according to a number of performance tests conducted on multiple products, the production process of the present invention is reasonably designed, with high production efficiency and stable product quality. The tensile strength can reach 1.5-3MPa, the elongation at break can reach 300%-500%, the viscosity is moderate, and the solid content meets the standard requirements; the production process has a high degree of automation, which reduces manual errors and improves production efficiency. Compared with traditional processes, the production efficiency can be increased by 20-30%; precise moisture control and the reasonable connection of each process effectively avoid product quality problems caused by factors such as moisture, and the product qualification rate can reach more than 96%.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A one-component polyurethane waterproof coating manufacturing process, characterized in that: The one-component polyurethane waterproof coating is made of the following raw materials in parts by weight: 20-35 parts of polyisocyanate (MDI), 40-60 parts of polyether polyol, 3-8 parts of chain extender, 0.1-0.5 parts of catalyst, 0.5-1.5 parts of defoamer, 5-15 parts of solvent, and 10-20 parts of filler; The manufacturing process includes the following steps: automatic batching, accurately weighing polyether polyols, chain extenders, and catalysts according to a preset formula, transporting the weighed raw materials to the reactor, and then stirring and dispersing them, heating and dispersing and dehydrating them, and then testing the moisture content. After the moisture content meets the requirements, MDI is added dropwise for constant temperature reaction, and after cooling, auxiliary agents and solvent oil are manually added for a secondary constant temperature reaction, and then a secondary stirring and dispersion is performed, followed by a secondary cooling, appearance inspection, and finally automatic filling. Dust collection and exhaust gas treatment are performed during the automatic batching and dispersion and dehydration processes.

2. The one-component polyurethane waterproof coating manufacturing process according to claim 1, characterized in that: The automatic batching process includes accurately weighing polyether polyol, chain extender, filler, and catalyst raw materials according to a preset formula through a weight sensor, wherein the amount of polyether polyol is 40-60 parts by weight, the chain extender is 3-8 parts by weight, the catalyst is 0.1-0.5 parts by weight, and the filler is 10-20 parts by weight. The weighing error of each raw material is within ±0.5%, and the weighed raw materials are transported to the reactor.

3. The one-component polyurethane waterproof coating manufacturing process according to claim 1, characterized in that: The stirring and dispersing step is to stir and disperse the raw materials in the reaction kettle at a rotation speed of 200-400 rpm for 10-20 minutes, so that the raw materials are fully mixed to form a uniform mixture.

4. The one-component polyurethane waterproof coating manufacturing process according to claim 1, characterized in that: The heating dispersion dehydration process includes heating the reactor to raise the temperature in the reactor to 100-120° C. at a heating rate of 5-10° C. / min, and continuously stirring, dispersing and dehydrating at this temperature for 1-3 hours to fully evaporate the water in the raw materials.

5. The one-component polyurethane waterproof coating manufacturing process according to claim 1, characterized in that: The moisture detection process includes using a high-precision moisture detector to detect the moisture content of the material after the heating, dispersion and dehydration process in the reactor. When the moisture content is lower than 0.05%, the next step can be entered; if the moisture content is higher than this standard, the heating and dehydration operation will continue.

6. The process for manufacturing a one-component polyurethane waterproof coating according to claim 1, characterized in that: The step of dropping MDI for constant temperature reaction includes slowly dropping MDI into the reactor, the amount of MDI is 20-35 parts by weight, the dropping time is controlled at 30-60 minutes, and the temperature in the reactor is maintained at 60-80° C. After the dropping is completed, the constant temperature reaction is continued at this temperature for 2-4 hours to allow MDI to fully react with the previous mixture.

7. The process for manufacturing a one-component polyurethane waterproof coating according to claim 1, characterized in that: The process of manually adding auxiliary agents and solvent oil for secondary constant temperature reaction includes manually adding 0.5-1.5 parts by weight of defoamer, 0.3-1.5 parts by weight of leveling agent and 5-15 parts by weight of solvent oil into the reactor, and reacting at a constant temperature of 50-70° C. with stirring for 1-2 hours to fully blend the auxiliary agents and solvent oil with the raw materials.

8. The process for producing a one-component polyurethane waterproof coating according to claim 1, characterized in that: The secondary stirring and dispersing process includes stirring and dispersing at a rotation speed of 300-500 rpm for 20-30 minutes to further improve the uniformity of the product.

9. The process for producing a one-component polyurethane waterproof coating according to claim 1, characterized in that: The secondary cooling process includes cooling the reactor using a circulating water cooling system to reduce the temperature inside the reactor to 30-40°C.

10. The process for producing a one-component polyurethane waterproof coating according to claim 1, characterized in that: In the automatic batching process, a multi-stage filtering device is used for dust collection, and in the dispersion and dehydration process, vacuuming is used to extract waste gas and condense and recover it.

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