Preparation method of drawing pigment peach gum liquid and automatic production device thereof

Abstract

The invention belongs to the technical field of painting pigments, and particularly relates to a preparation method of a painting pigment peach gum solution and an automatic production device of the painting pigment peach gum solution. The preparation method of the drawing pigment peach gum liquid comprises the steps of peach gum particle crushing, heating, stirring and dissolving, cooling, pH adjusting and standing, filtering, precipitating, blending, bleaching and the like, peach gum is completely dissolved step by step in different temperature intervals, the peach gum liquid obtained through alkali bleaching, pH adjusting and blending and other means is low in chromaticity, the solid content meets the process standard, and the drawing pigment peach gum liquid is suitable for large-scale production. The method is implemented through an automatic production device, peach gum processing links are closely linked, production standards are controllable and consistent, the quality of the prepared finished product gum solution is excellent, and the method is particularly suitable for large-scale and assembly line batch production of the peach gum solution.

Description

Technical Field

[0001] This invention belongs to the field of painting pigment technology, specifically relating to a method for preparing peach gum liquid painting pigment and its automated production device. Background Technology

[0002] Peach gum is a translucent, gum-like substance secreted from the trunks of peach or wild peach trees (Rosaceae family) after mechanical injury or disease. The solid substance formed by air drying or other dehydration methods on the trunk is called raw peach gum. Raw peach gum is a smooth, translucent, pink or pale yellow solid block that generally only swells upon contact with water and does not dissolve completely. Its aqueous solution is viscous, and it is a polysaccharide. After removing impurities, hydrolyzing or modifying, and drying, raw peach gum is processed to obtain commercially available solid peach gum.

[0003] Gum gum solution, formed by dissolving solid gum arabic, can be used in painting pigments to improve their color retention and adhesion. Current gum arabic production generally employs a segmented processing method, resulting in discontinuous processing. This reduces production efficiency, makes it difficult to guarantee the quality of the finished product, hinders large-scale, assembly-line production, and makes it difficult to control processing standards. For example, significant color deviations in the solution severely affect the color rendering properties of the painting pigments, or a solid content of less than 20% significantly reduces the adhesion of the painting pigments. Summary of the Invention

[0004] The purpose of this invention is to provide a production method and automated production device for preparing gum arabic paint with low chroma and solid content that meets the process standards. The method features close connection between processing steps, consistent production standards for gum arabic, and good color development and bonding properties of the gum arabic.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for preparing a painting pigment, gum arabic, characterized by comprising the following steps: Step 1: Crush the dried peach gum into particles with a diameter of no more than 5cm; Step 2: Take 14-32 parts of the above-mentioned particles and mix them with 70-80 parts of water. Add 3-6 parts of triethanolamine colloidal particle solubilizing agent, heat to 80-95℃ and stir for 8-9 hours until completely dissolved to obtain the first miscible. Step 3: Lower the temperature of the first miscible to 65-75℃, add 1-2 parts of triethanolamine colloidal solubilizing agent and 0.5-0.8 parts of potassium hydroxide to adjust the pH value to the range of 10-10.5, stir until the pH value drops to 5-6, and then let it stand for no less than 36 hours to obtain the second miscible. Step 4: Filter the second mixture with a screen mesh size of not less than 40 mesh to separate the initial peach gum solution. After precipitating it for 6-18 hours, further reduce the temperature to below 40 degrees Celsius. Step 5: Add 3-5 parts of propylene glycol humectant and 0.15-0.3 parts of Kathon preservative to the initial peach gum solution after step 4 to mix the gum solution. Then add 3-4 parts of bleaching agent and stir to obtain the finished peach gum solution.

[0006] —In step five, the mixture is prepared so that the solid content of the adhesive is between 28% and 38%, and the viscosity is between 33% and 42 degrees. The bleaching agent is a hydrogen peroxide solution with a mass percentage concentration of 20%-30%.

[0007] The method for preparing gum arabic for painting pigments provided by this invention has the following advantages compared with the prior art: The preparation method includes steps such as pulverizing gum arabic particles, heating and stirring to dissolve, cooling and adjusting pH to allow it to stand, filtering and settling, and blending and bleaching. In particular, triethanolamine gum arabic particle dissolving aid is added in two steps at two temperature ranges of 80-95℃ and 65-75℃, and the mixture is stirred at the same temperature until the gum arabic particles are completely dissolved. The gum arabic prepared by adjusting the pH value with potassium hydroxide, bleaching with hydrogen peroxide, allowing it to stand and settle, and blending and bleaching results in gum arabic with low color and solid content that meets the process standards, making it an excellent quality finished product for painting pigments.

[0008] The present invention also provides an automated production apparatus for implementing the above-mentioned method for preparing gum arabic pigment, comprising a pulverizer, a first reaction vessel, a second reaction vessel, a filter, a separation sedimentation tank, and a blending and bleaching reaction vessel connected in sequence by pipelines. The stirring paddle in the first reaction vessel used for implementing step two above rotates at 50-70 rpm, the stirring paddle in the second reaction vessel used for implementing step three above rotates at 100-150 rpm, and the stirring paddle in the blending and bleaching reaction vessel used for implementing step five above rotates at 30-40 rpm.

[0009] —It also includes a PLC controller for linkage control. The pipeline is equipped with switching valves and power pumps between adjacent devices. The switching valves and power pumps are electrically connected to the PLC controller. Electric heaters are installed in both the first and second reaction vessels. The electric heaters include temperature sensors and are electrically connected to the PLC controller.

[0010] The painting pigment gum syrup preparation and production apparatus provided by this invention employs a pulverizer, a first reaction vessel, a second reaction vessel, a filter, a separation and sedimentation tank, and a blending and bleaching reaction vessel connected in sequence. This apparatus realizes the process steps of pulverizing gum granules, heating and stirring to dissolve, cooling and pH adjustment for settling, filtration and sedimentation, and blending and bleaching. By first raising the pH value with potassium hydroxide and then using hydrogen peroxide for bleaching, the high molecular weight gum polysaccharide molecules are protected, maintaining the solid content of the gum syrup. Then, the oxidizing property of the hydrogen peroxide solution is used to oxidize and fade the pigment. After adding hydrogen peroxide solution for bleaching, the pH value gradually decreases, approaching neutral, to obtain a finished gum syrup with low color intensity. This method features tightly integrated processing steps and a continuous production process, improving the preparation efficiency of gum syrup. Furthermore, through PLC controller linkage control, processing parameters are ensured to be adjusted in real time, achieving consistent production standards, low color intensity, high solid content, and excellent finished pigment quality. It is particularly suitable for large-scale, assembly-line production requirements of gum syrup processing. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the production apparatus for the preparation method of the painting pigment gum liquid of the present invention. Detailed Implementation

[0012] The following detailed description, in conjunction with embodiments, illustrates the preparation method of the gum arabic pigment provided by this invention, as well as the structure and working principle of the production apparatus. Obviously, the described embodiments are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0013] In the description of this invention, unless otherwise stated, the orientation or positional relationship indicated in the terminology is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0014] It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "set / equipped" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example

[0015] Step 1: Crush the dried peach gum into particles with a diameter of no more than 5 cm using a crusher 1. Step 2: In the first reaction vessel 2, 15 parts of the above-mentioned particulate matter are mixed with 75 parts of water, 3.5 parts of triethanolamine colloidal particle solubilizing agent are added, the mixture is heated to 95°C and stirred for 9 hours until completely dissolved to obtain the first miscible. The stirring speed is 65 rpm. Step 3: In the second reaction vessel 3, the temperature of the first mixture is reduced to 70°C, 1.5 parts of triethanolamine colloidal particle dissolving aid and 0.6 parts of potassium hydroxide are added to adjust the pH value to 10. The mixture is stirred until the pH value drops to 5.5, and then allowed to stand for 36 hours to obtain the second mixture. The stirring speed is 120 rpm. Step 4: Filter the second mixture through filter 4 with a mesh size of not less than 40 mesh. Separate the initial peach gum liquid and enter the separation sedimentation tank 5. After sedimentation for 10 hours, the temperature is further reduced to below 40 degrees Celsius. Step 5: In the blending and bleaching reactor 6, add 3 parts of propylene glycol humectant and 0.2 parts of Kathon preservative to the peach gum initial solution treated in Step 4 to blend the gum solution. Then add 3 parts of bleaching agent (hydrogen peroxide solution with a mass percentage concentration of 20%-30%) and stir until the gum solution is clear. The stirring speed is 35 rpm and the stirring time is between 20 and 30 minutes to obtain the finished peach gum solution, which is then transferred to the finished product tank or gum solution pool 7.

[0016] After testing, the solid content of the prepared peach gum solution was 36%, and the color was less than that of the No. 5 colorimeter. Example

[0017] Step 1: Crush the dried peach gum into particles with a diameter of no more than 5 cm using a crusher 1. Step 2: In the first reaction vessel 2, take 30 parts of the above-mentioned particulate matter and mix it with 80 parts of water, add 5.5 parts of triethanolamine colloidal particle solubilizing agent, heat to 90°C and stir for 8 hours until completely dissolved to obtain the first miscible. The stirring speed is 60 rpm. Step 3: In the second reaction vessel 3, the temperature of the first mixture is reduced to 70°C, 2 parts of triethanolamine colloidal particle dissolving aid and 0.8 parts of potassium hydroxide are added to adjust the pH value to 10, and the mixture is stirred until the pH value drops to 5. Then it is allowed to stand for 48 hours to obtain the second mixture, wherein the stirring speed is 150 rpm. Step 4: Filter the second mixture through filter 4 with a mesh size of not less than 40 mesh. Separate the initial peach gum liquid and enter the separation sedimentation tank 5. After sedimentation for 12 hours, the temperature is further reduced to below 40 degrees Celsius. Step 5: In the blending and bleaching reactor 6, add 4 parts of propylene glycol humectant and 0.3 parts of Kathon preservative to the peach gum initial solution treated in Step 4 to blend the gum solution. Then add 3.5 parts of bleaching agent (hydrogen peroxide solution with a mass percentage concentration of 20%-30%) and stir until the gum solution is clear. The stirring speed is 40 rpm and the stirring time is between 20 and 30 minutes to obtain the finished peach gum solution, which is then transferred to the finished product tank or gum solution pool 7.

[0018] After testing, the solid content of the prepared peach gum solution was 38%, and the color was less than that of the No. 5 colorimeter.

[0019] like Figure 1 As shown, the production apparatus used in this embodiment for implementing the above-mentioned method for preparing gum arabic pigment includes a pulverizer 1, a first reaction vessel 2, a second reaction vessel 3, a filter 4, a separation sedimentation tank 5, and a blending and bleaching reaction vessel 6 connected in sequence by pipelines. The pulverizer 1 is used to implement step one, the first reaction vessel 2 is used to implement step two, the second reaction vessel 3 is used to implement step three, the filter 4 and the separation sedimentation tank 5 are used to implement step four, and the blending and bleaching reaction vessel 6 is used to implement step five.

[0020] The production unit also includes a PLC controller 8 for linkage control. The aforementioned pipelines are equipped with switch valves and power pumps between adjacent equipment. The switch valves and power pumps are electrically connected to the PLC controller. Electric heaters are installed in both the first reactor 2 and the second reactor 3. The electric heaters include temperature sensors and are electrically connected to the PLC controller 8. This enables continuous connection of the entire processing technology, real-time control of production standards, and suitability for large-scale, standardized, and assembly line production of peach gum.

[0021] The embodiments described above are only used to illustrate the technical solutions of the present invention and are not limiting conditions for the implementation of the present invention. Therefore, any other modifications or equivalent substitutions in configuration, size, or internal structure made to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A method for preparing a painting pigment, gum arabic, characterized in that: Includes the following steps, Step 1: Crush the dried peach gum into particles with a diameter of no more than 5cm; Step 2: Take 14-32 parts of the above-mentioned particles and mix them with 70-80 parts of water. Add 3-6 parts of triethanolamine colloidal particle solubilizing agent, heat to 80-95℃ and stir for 8-9 hours until completely dissolved to obtain the first miscible. Step 3: Lower the temperature of the first miscible to 65-75℃, add 1-2 parts of triethanolamine colloidal solubilizing agent and 0.5-0.8 parts of potassium hydroxide to adjust the pH value to the range of 10-10.5, stir until the pH value drops to 5-6, and then let it stand for no less than 36 hours to obtain the second miscible. Step 4: Filter the second mixture with a screen mesh size of not less than 40 mesh to separate the initial peach gum solution. After precipitating it for 6-18 hours, further reduce the temperature to below 40 degrees Celsius. Step 5: Add 3-5 parts of propylene glycol humectant and 0.15-0.3 parts of Kathon preservative to the initial peach gum solution after step 4 to mix the gum solution. Then add 3-4 parts of bleaching agent and stir to obtain the finished peach gum solution.

2. The method for preparing a painting pigment gum liquid according to claim 1, characterized in that... In step five, the mixture is prepared so that the solid content of the adhesive is between 28% and 38%, and the viscosity is between 33% and 42 degrees. The bleaching agent is a hydrogen peroxide solution with a mass percentage concentration of 20%-30%.

3. An apparatus for preparing gum arabic, a type of paint pigment, characterized in that: The preparation method according to claims 1-2 includes a pulverizer, a first reaction vessel, a second reaction vessel, a filter, a separation sedimentation tank, and a blending and bleaching reaction vessel connected in sequence by pipelines. The stirring paddle in the first reaction vessel used in step two rotates at 50-70 rpm, the stirring paddle in the second reaction vessel used in step three rotates at 100-150 rpm, and the stirring paddle in the blending and bleaching reaction vessel used in step five rotates at 30-40 rpm.

4. The apparatus for preparing gum arabic pigment according to claim 3, characterized in that: It also includes a PLC controller for linkage control. The pipeline is equipped with switching valves and power pumps between adjacent equipment. The switching valves and power pumps are electrically connected to the PLC controller. Electric heaters are installed in both the first and second reaction vessels. The electric heaters include temperature sensors and are electrically connected to the PLC controller.

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