White latex processing technology, white latex emulsion, white latex binder and glue binder

Abstract

The invention discloses a white latex processing technology, a white latex emulsion, a white latex binder and a latex binder, and particularly relates to the technical field of chemical material preparation, and the white latex processing technology comprises the following steps: S1, mixing main materials; s2, raising the temperature and heating; s3, carrying out heat preservation and stirring; S4, mixing auxiliary materials; and S5, preparing a finished product. By optimizing the raw material ratio, introducing a specific additive, adopting an electric energy and liquefied petroleum gas synergistic heating technology and combining a precise temperature control and step-by-step stirring process, the product forms a homogeneous colloid structure, and the bonding performance and stability are remarkably improved; the specific acrylate copolymer and the nano silicon dioxide are added in the emulsion preparation process, so that the bonding strength and the weather resistance are effectively enhanced, meanwhile, the VOC emission is reduced to be smaller than or equal to 50 g / L, a high-performance product with the solid content larger than or equal to 45% is finally obtained, and the dual requirements of environmental protection and industrial application are met.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical material preparation, and particularly to the processing technology of white emulsion, white emulsion, white emulsion binder and glue binder. Background Art

[0002] As an adhesive widely used in the fields of wood processing, paper bonding, building decoration, etc., the performance of white emulsion is closely related to the selection, proportioning and processing technology of raw materials. The traditional white emulsion production process has problems such as unreasonable raw material proportioning and inaccurate control of reaction conditions, resulting in unstable product performance and being difficult to meet the requirements of modern industry for high-quality adhesives. Therefore, it is of great practical significance to develop an efficient, stable and environmentally friendly white emulsion processing technology.

[0003] The traditional white emulsion process mostly relies on a single heat source for heating, resulting in uneven temperature distribution in the reaction kettle, which is prone to cause local overheating or incomplete reaction, affecting the product uniformity; the raw material proportioning lacks scientific verification, and when the proportion of key components such as urea and polyvinyl alcohol is unbalanced, problems such as insufficient bonding strength or low solid content are likely to occur; in addition, the traditional process does not introduce nanomaterial modification technology, the weather resistance and mechanical properties of the product are limited, and the VOC emissions are not effectively controlled during the production process, making it difficult to meet the requirements of modern environmental protection standards. Summary of the Invention

[0004] The main purpose of the present invention is to provide a white emulsion processing technology, white emulsion, white emulsion binder and glue binder, which can effectively solve the problems existing in the traditional process.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A white emulsion processing technology, comprising the following steps:

[0007] S1. Mixing of main materials: Mix 20%-45% starch, 30%-50% urea, 20%-45% aqueous methanol, and 5%-25% sugar, and then add them to the reaction tank; S2. Heating up: Using electric energy as the starting energy source and liquefied petroleum gas as the heating medium, raise the temperature in the reaction kettle to 95-105°C, with a stirring rate of 200-400 rpm, and continuously stir until completely dissolved; S3. Insulation and stirring: Keep the temperature at 90-100°C and stir evenly, and carry out an insulation reaction for 1.5-2.5 hours to form a homogeneous colloid; S4. Mixing of auxiliary materials: Add ethyl acetate, 0.5%-2% ammonium persulfate, 1%-3% sodium acrylate, and 0.1%-0.5% titanium amide in batches, and control the addition interval time to be 15-30 minutes; S5. Obtaining the finished product: Keep stirring at 90-100°C, carry out an insulation reaction for 1.5-2.5 hours to form a semi-finished product, add 707 emulsion, and the addition amount is 5%-15% of the total material mass, and carry out an insulation and stirring for 1.5-2.5 hours to form the final white latex finished product; S7. Naturally cool to 25-40°C at a rate of 1-3°C / min, stand for 4-6 hours, and then package in separate containers.

[0008] Preferably, the starch is corn starch or tapioca starch, and is pretreated by sieving through an 80-100 mesh sieve.

[0009] Preferably, the ethyl acetate is ethyl acetate or ethyl acrylate, and the addition amount is 0.5%-1.5% of the total material mass.

[0010] A white latex emulsion, which is prepared by using a white latex processing technology and contains the following components in mass percentage:

[0011] Urea 30%-50%, polyvinyl alcohol solution 20%-45%, sugar 5%-25%, 707 emulsion 5%-15%, sodium acrylate 1%-3%, ammonium persulfate 0.5%-2%, titanium amide 0.1%-0.5%, and the balance is deionized water, and the viscosity of the emulsion is 2000-5000 mPa·s (25°C).

[0012] A white latex binder is prepared on the basis of the white latex emulsion: On the basis of the white latex emulsion, add 2%-5% of acrylate copolymer and 0.1%-0.3% of preservative; the acrylate copolymer is copolymerized from butyl acrylate and methyl methacrylate in a mass ratio of 2:1-1:2.

[0013] Preferably, the preservative is sodium benzoate or isothiazolinone, and the pH value of the final binder is 6.5-7.5, and the solid content ≥ 45%.

[0014] An adhesive is prepared based on white latex adhesive: on the basis of the adhesive, 1%-3% of nano-silica and 0.5%-1% of polyurethane plasticizer are added by total amount, and the particle size of the nano-silica is 10-50nm.

[0015] Preferably, the peel strength of the adhesive is ≥3.5N / mm, and the VOC emission is ≤50g / L.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] By optimizing the raw material ratio and introducing specific additives, adopting the synergistic heating technology of electric energy and liquefied petroleum gas, combining precise temperature control and step-by-step stirring process, the product forms a homogeneous colloidal structure, significantly improving the bonding performance and stability; by adding specific acrylate copolymer and nano-silica in the emulsion preparation, the bonding strength and weather resistance are effectively enhanced, and at the same time the VOC emission is reduced to ≤50g / L, and finally a high-performance product with a solid content of ≥45% is realized, meeting the dual requirements of environmental protection and industrial applications. Description of the Drawings

[0018] Figure 1 It is the process flow chart of the processing technology of the present invention. Detailed Embodiments

[0019] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0020] Example 1, the processing technology of white latex and the preparation of related products;

[0021] S1. Mixing of main materials: 20% corn starch (sieved through an 80-mesh sieve), 30% urea, 20% aqueous methanol, and 25% sugar are mixed and added to the reaction tank.

[0022] S2. Heating up: Using electric energy as the starting energy source and liquefied petroleum gas as the heating medium, the temperature in the reaction kettle is raised to 95°C, the stirring rate is 200rpm, and continuous stirring is carried out until completely dissolved.

[0023] S3. Insulation stirring: Keep the temperature at 90°C and stir evenly, and carry out an insulation reaction for 1.5 hours to form a homogeneous colloid.

[0024] S4. Mixing of auxiliary materials: Ethyl acetate (the addition amount is 0.5% of the total material mass), ammonium persulfate 0.5%, sodium acrylate 1%, and titanium amide 0.1% are added in batches, and the addition interval time is controlled to be 15 minutes.

[0025] S5. Obtaining the finished product: Continue stirring at 90°C, hold for a reaction of 1.5 hours to form a semi-finished product, add 707 emulsion (the addition amount is 5% of the total material mass), hold and stir for 1.5 hours to form the final white latex finished product, naturally cool to 25°C at a rate of 1°C / min, stand for 4 hours and then package.

[0026] S6: Based on the above process, modify the material ratio to 30% urea, 20% polyvinyl alcohol solution, 25% sugar, 5% 707 emulsion, 1% sodium acrylate, 0.5% ammonium persulfate, 0.1% amino titanium, and the balance is deionized water. The viscosity of the emulsion is 2000 mPa·s (25°C) to obtain a white latex emulsion.

[0027] S7: Add 2% of acrylate copolymer (copolymerized from butyl acrylate and methyl methacrylate in a mass ratio of 2:1) and 0.1% of sodium benzoate based on the above white latex emulsion. The final pH value of the binder is 6.5 and the solid content is 45% to obtain a white latex binder.

[0028] S8: Based on the above binder, add 1% of nano-silica (particle size of 10 nm) and 0.5% of polyurethane plasticizer. The peel strength of the adhesive is 3.5 N / mm and the VOC emission is 50 g / L to obtain an adhesive binder.

[0029] Example 2, optimizing parameters for the white latex processing technology and product preparation;

[0030] S1. Mixing of main materials: Mix 45% tapioca starch (sieved through a 100-mesh sieve), 50% urea, 45% aqueous methanol, and 5% sugar and add them to the reaction tank.

[0031] S2. Heating up: Use electric energy as the starting energy source and liquefied petroleum gas as the heating medium to raise the temperature in the reaction kettle to 105°C, with a stirring rate of 400 rpm, and continuously stir until completely dissolved.

[0032] S3. Holding and stirring: Keep the temperature at 100°C and stir evenly, hold for a reaction of 2.5 hours to form a homogeneous colloid.

[0033] S4. Mixing of auxiliary materials: Add ethyl acrylate (the addition amount is 1.5% of the total material mass), 2% ammonium persulfate, 3% sodium acrylate, and 0.5% amino titanium in batches, and control the addition interval time to be 30 minutes.

[0034] S5. Obtaining the finished product: Continue stirring at 100°C, hold for a reaction of 2.5 hours to form a semi-finished product, add 707 emulsion (the addition amount is 15% of the total material mass), hold and stir for 2.5 hours to form the final white latex finished product, naturally cool to 40°C at a rate of 3°C / min, stand for 6 hours and then package.

[0035] S6: Based on the above process, modify the material ratio to 50% urea, 45% polyvinyl alcohol solution, 5% sugar, 15% 707 emulsion, 3% sodium acrylate, 2% ammonium persulfate, 0.5% amino titanium, and the balance is deionized water. The emulsion viscosity is 5000 mPa·s (25 °C) to obtain a white latex emulsion.

[0036] S7: On the basis of the above white latex emulsion, add 5% of the total amount of acrylate copolymer (copolymerized from butyl acrylate and methyl methacrylate in a mass ratio of 1:2), and 0.3% of isothiazolinone. The final pH value of the binder is 7.5, and the solid content is 50% to obtain a white latex binder.

[0037] S8: On the basis of the above binder, add 3% of the total amount of nano-silica (particle size of 50 nm) and 1% of polyurethane plasticizer. The peel strength of the adhesive is 4.0 N / mm, and the VOC emission is 40 g / L to obtain an adhesive binder.

[0038] Example 3: Process for improving the comprehensive performance of white latex and preparation of products;

[0039] S1. Mixing of main materials: Mix 35% corn starch (sieved through a 90-mesh sieve), 40% urea, 35% aqueous methanol, and 15% sugar and add them to the reaction tank.

[0040] S2. Heating up: Using electric energy as the starting energy source and liquefied petroleum gas as the heating medium, raise the temperature in the reaction kettle to 100 °C, with a stirring rate of 300 rpm, and continuously stir until completely dissolved.

[0041] S3. Insulation stirring: Keep the temperature at 95 °C and stir evenly, and carry out an insulation reaction for 2 hours to form a homogeneous colloid.

[0042] S4. Mixing of auxiliary materials: Add ethyl acetate (the addition amount is 1% of the total material mass), 1% ammonium persulfate, 2% sodium acrylate, and 0.3% amino titanium in batches, and control the addition interval time to be 20 minutes.

[0043] S5. Obtaining the finished product: Keep stirring at 95 °C, carry out an insulation reaction for 2 hours to form a semi-finished product, add 707 emulsion (the addition amount is 10% of the total material mass), and stir for 2 hours to form the final white latex finished product. Naturally cool to 30 °C at a rate of 2 °C / min, stand for 5 hours and then package.

[0044] S6: Based on the above process, modify the material ratio to 40% urea, 35% polyvinyl alcohol solution, 15% sugar, 10% 707 emulsion, 2% sodium acrylate, 1% ammonium persulfate, 0.3% amino titanium, and the balance is deionized water. The emulsion viscosity is 3500 mPa·s (25 °C) to obtain a white latex emulsion.

[0045] S7: Based on the above white latex emulsion, add 3% of acrylate copolymer (copolymerized from butyl acrylate and methyl methacrylate in a mass ratio of 1:1) and 0.2% of sodium benzoate to the total amount. The final pH value of the binder is 7.0, and the solid content is 48%, thus obtaining the white latex binder.

[0046] S8: Based on the above binder, add 2% of nano-silica (with a particle size of 30 nm) and 0.8% of polyurethane plasticizer to the total amount. The peel strength of this adhesive is 4.5 N / mm, and the VOC emission is 30 g / L, thus obtaining the adhesive binder.

[0047] It can be known from the above embodiments that:

[0048] By optimizing the raw material ratio and introducing specific additives, adopting the synergistic heating technology of electric energy and liquefied petroleum gas, and combining precise temperature control and step-by-step stirring process, the product forms a homogeneous colloidal structure, significantly improving the bonding performance and stability; by adding specific acrylate copolymer and nano-silica in the emulsion preparation, the bonding strength and weather resistance are effectively enhanced, and at the same time, the VOC emission is reduced to ≤50 g / L. Finally, a high-performance product with a solid content ≥45% is achieved, meeting the dual requirements of environmental protection and industrial applications. Moreover, by using aqueous methanol instead of water, it can be well diluted without solidification or sedimentation.

[0049] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A white latex processing technology, characterized in that, It includes the following steps: S1. Mixing of main materials: Mix 20%-45% starch, 30%-50% urea, 20%-45% aqueous methanol, and 5%-25% sugar, and then add them to the reaction tank; S2. Heating up: Using electric energy as the starting energy source and liquefied petroleum gas as the heating medium, raise the temperature in the reaction kettle to 95-105°C, with a stirring rate of 200-400 rpm, and continuously stir until completely dissolved; S3. Heat preservation and stirring: Keep the temperature at 90-100°C and stir evenly, and carry out a heat preservation reaction for 1.5-2.5 hours to form a homogeneous colloid; S4. Mixing of auxiliary materials: Add ethyl acetate, 0.5%-2% ammonium persulfate, 1%-3% sodium acrylate, and 0.1%-0.5% titanium amide in batches, and control the addition interval time to be 15-30 minutes; S5. Obtaining the finished product: Keep stirring at 90-100°C, carry out a heat preservation reaction for 1.5-2.5 hours to form a semi-finished product, add 707 emulsion, and the addition amount is 5%-15% of the total material mass. Keep stirring at a constant temperature for 1.5-2.5 hours to form the final white latex finished product, and naturally cool it to 25-40°C at a rate of 1-3°C / min, and then stand for 4-6 hours and package after standing; 2. The white emulsion glue processing technology according to claim 1, characterized in that: The starch is corn starch or tapioca starch, and is pretreated by sieving through an 80-100 mesh sieve; 3. The white latex processing technology according to claim 2, characterized in that: The ethyl acetate is ethyl acetate or ethyl acrylate, and the addition amount is 0.5%-1.5% of the total material mass; 4. A white latex emulsion, which is prepared by using the white latex processing process described in any one of claims 1-3, and is characterized in that, It contains the following components in mass percentage: 30%-50% urea, 20%-45% polyvinyl alcohol solution, 5%-25% sugar, 5%-15% 707 emulsion, 1%-3% sodium acrylate, 0.5%-2% ammonium persulfate, 0.1%-0.5% titanium amide, and the balance is deionized water, and the viscosity of the emulsion is 2000-5000 mPa·s (25°C); 5. A white latex binder, prepared on the basis of the white latex emulsion described in claim 4, characterized in that: Based on the white latex emulsion, add 2%-5% of acrylate copolymer and 0.1%-0.3% of preservative to the total amount; the acrylate copolymer is copolymerized from butyl acrylate and methyl methacrylate according to a mass ratio of 2:1-1:2; 6. The white latex binder according to claim 5, characterized in that: The preservative is sodium benzoate or isothiazolinone, and the pH value of the final binder is 6.5-7.5, and the solid content ≥ 45%; 7. An adhesive, prepared on the basis of the white emulsion adhesive described in claim 5, characterized in that: Based on the binder, add 1%-3% of nano-silica and 0.5%-1% of polyurethane plasticizer to the total amount, and the particle size of the nano-silica is 10-50 nm; 8. The adhesive binder according to claim 7, characterized in that: The peel strength of the adhesive is ≥ 3.5 N / mm, and the VOC emission is ≤ 50 g / L.

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