Processing method of corrosion-resistant conductive coating

Abstract

The invention discloses a processing method of a corrosion-resistant conductive coating, and relates to the technical field of coatings. The preparation method comprises the following steps: taking isophthalic acid, carbon nanotubes, ethylene glycol, maleic anhydride, rosin, styrene, a polymerization inhibitor, a catalyst and an antioxidant; the preparation method comprises the following steps: mixing isophthalic acid, carbon nanotubes and a catalyst, stirring for reaction, and carrying out heat-preservation reaction; adding ethylene glycol and maleic anhydride, stirring for reaction, heating, and keeping the temperature for reaction; then adding rosin, carrying out heat preservation reaction, then heating, and carrying out heat preservation reaction; cooling, adding an antioxidant, a polymerization inhibitor and styrene, stirring and blending, and then cooling to obtain the corrosion-resistant conductive coating. The corrosion-resistant conductive coating prepared by the invention has excellent water resistance, acid resistance and alkali resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of coating materials, and particularly relates to a processing method for a corrosion-resistant conductive coating. Background Art

[0002] According to the material composition and conductive principle of conductive coatings, they can be divided into two types, namely structural conductive coatings and filled conductive coatings. Structural conductive coatings refer to conductive coatings made by using polymer materials with inherent conductivity or by adding some other polymer materials to these polymer materials with inherent conductivity. It mainly provides conductive carriers through the polymer structure. Filled conductive coatings are mainly composed of polymer polymers, conductive fillers, solvents, and additives. It is to add some conductive inorganic particles (such as metals, metal oxides, carbon black, graphite, graphene, ethylene glycol, etc.) or organic antistatic agents to non-conductive polymer polymers, and through dispersion compounding, lamination compounding, and surface compounding methods, combine the conductive ability of the conductive filler with the excellent mechanical and physical properties of the polymer polymer such as weather resistance, high temperature resistance, pollution resistance, and easy processing.

[0003] Filled conductive coatings exhibit excellent comprehensive properties in actual research and applications and have become the focus and key point of the research and development of the conductive coating industry. However, there are still many problems to be solved in actual applications. For example, they need to have good high-temperature resistance in high-temperature environments and good corrosion resistance in humid and acidic or alkaline environments. Therefore, it is urgent to study a corrosion-resistant conductive coating. Summary of the Invention

[0004] The purpose of the present invention is to provide a processing method for a corrosion-resistant conductive coating to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A processing method for a corrosion-resistant conductive coating, and the processing method for the corrosion-resistant conductive coating is as follows:

[0007] (1) Take isophthalic acid, carbon nanotubes, ethylene glycol, maleic anhydride, rosin, styrene, inhibitor, catalyst, antioxidant;

[0008] (2) Mix isophthalic acid, carbon nanotubes and the catalyst, stir and react, and keep the temperature for reaction;

[0009] (3) Then add ethylene glycol and maleic anhydride, stir and react, then raise the temperature and keep the temperature for reaction;

[0010] (4) Subsequently add rosin, keep the temperature for reaction, then raise the temperature and keep the temperature for reaction;

[0011] (5) Cool down the temperature, add antioxidant, inhibitor and styrene, stir and blend, and then cool down the temperature to obtain the corrosion-resistant conductive coating.

[0012] Preferably, the specific processing method of the corrosion-resistant conductive coating is as follows:

[0013] (1) By weight, take 20 - 30 parts of isophthalic acid, 40 - 60 parts of carbon nanotubes, 20 - 30 parts of ethylene glycol, 60 - 80 parts of maleic anhydride, 8 - 10 parts of rosin, 60 - 80 parts of styrene, 5 - 6 parts of inhibitor, 2 - 3 parts of catalyst, and 2 - 3 parts of antioxidant;

[0014] (2) Place isophthalic acid, carbon nanotubes and catalyst in a reaction kettle, under a nitrogen atmosphere, at a temperature of 175 - 185 °C and a rotation speed of 600 - 800 r / min, stir and react for 1 - 2 h, then raise the temperature to 210 - 230 °C for heat preservation, and react until the acid value reaches 3 - 6 mgKOH / g;

[0015] (3) Then add ethylene glycol and maleic anhydride to the reaction kettle, at a temperature of 165 - 175 °C and a rotation speed of 600 - 800 r / min, stir and react for 30 - 50 min, then raise the temperature to 210 - 220 °C for heat preservation reaction, and react until the acid value reaches 58 - 63 mgKOH / g;

[0016] (4) Subsequently, add rosin to the reaction kettle, at a temperature of 210 - 220 °C and a rotation speed of 800 - 1000 r / min, heat preservation reaction for 1 - 2 h, then raise the temperature to 210 - 230 °C for heat preservation, and react until the acid value reaches 40 - 45 mgKOH / g;

[0017] (5) Cool down the temperature to 70 - 80 °C, add antioxidant, inhibitor and styrene, stir and blend at a rotation speed of 600 - 800 r / min, and then cool down the temperature to 40 - 50 °C to obtain the corrosion-resistant conductive coating.

[0018] Preferably, the catalyst in step (1) is prepared by mixing antimony glycolate, tetrabutyl titanate, stannous octoate, and monobutyltin oxide according to a mass ratio of 1:2:3:1.

[0019] Preferably, the inhibitor in step (1) is hydroquinone.

[0020] Preferably, the antioxidant in step (1) is triphenyl phosphite.

[0021] Preferably, the rosin in step (1) can also be modified rosin.

[0022] Preferably, the preparation method of the modified rosin is as follows: by weight, take 20-30 parts of rosin powder, 60-80 parts of hydroquinone, and 20-30 parts of acrylic acid. Place the rosin powder and hydroquinone in a reactor. Under a nitrogen atmosphere, at a temperature of 170-180°C and a rotation speed of 800-1000 r / min, stir and mix for 20-30 min. Then, raise the temperature to 210-220°C, and then dropwise add acrylic acid. The dropping time is controlled within 1.2-1.5 h. After the addition of acrylic acid is completed, raise the temperature to 240-248°C, and under the condition of a rotation speed of 800-1000 r / min, stir and react for 30-50 min, and then cool down to 170-180°C to obtain the modified rosin.

[0023] In summary, due to the adoption of the above technologies, the beneficial effects of the present invention are as follows:

[0024] (1) In the present invention, rosin is selected to be added in the later stage of the condensation reaction, mainly to use the esterification reaction for end-capping, destroy the symmetry of the polyester molecular structure, reduce the crystallization ability of the polyester, and is beneficial to the compatibility between the m-phthalic polyester and styrene. In addition, due to the structure of rosin itself, it has good compatibility with styrene. End-capping with benzoic acid cannot well solve the compatibility problem between the m-phthalic polyester and styrene, while using rosin for end-capping can well solve this problem. The improvement of compatibility further enhances the mechanical properties of the system. At the same time, after the rosin acid caps the polyester chain, the hydrophilic group hydroxyl at the end group is reduced, the steric hindrance is increased, the ester groups in the molecule are protected, the end groups of the polyester molecular chain become active sites, the number of cross-linking points increases, and the cured structure becomes more dense, further improving the chemical stability of the p-phthalic polyester and enhancing the water and alkali resistance.

[0025] (2) In the present invention, through the modified rosin, the main component of rosin is rosin acid, and hydrophilic groups can be introduced through addition with acrylic acid for modification. When rosin is heated or under the action of organic acids or inorganic acids, the abietic acid-type resin acids contained in its composition will be isomerized under external stimuli to form levopimaric acid, which has resonance double bonds. This isomerization reaction is often reversible, that is, it can reach an equilibrium state under unchanged external conditions, and then undergoes a D-A addition reaction with acrylic acid, thereby converting monocarboxylic acid into dicarboxylic acid. During the process of using the modified rosin for end-capping, it can react more with the hydroxyl groups in the system for esterification reaction, so as to achieve further end-capping, thereby improving the water, acid and alkali resistance of the system. Specific Embodiments

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0027] Example 1

[0028] (1) By weight, take 30 parts of rosin powder, 60 parts of hydroquinone, and 30 parts of acrylic acid. Place the rosin powder and hydroquinone in a reactor. Under a nitrogen atmosphere, at a temperature of 180°C and a rotation speed of 800 r / min, stir and mix for 30 min. Then, raise the temperature to 210°C, and then dropwise add acrylic acid. The dropping time is controlled within 1.5 h. After the addition of acrylic acid is completed, raise the temperature to 240°C, and under the condition of a rotation speed of 1000 r / min, stir and react for 30 min, and then cool down to 180°C to obtain modified rosin.

[0029] (2) By weight, take 20 - 30 parts of isophthalic acid, 60 parts of carbon nanotubes, 20 parts of ethylene glycol, 80 parts of maleic anhydride, 8 parts of modified rosin, 80 parts of styrene, 5 parts of hydroquinone, 2 parts of catalyst, and 3 parts of triphenyl phosphite;

[0030] (3) Place isophthalic acid, carbon nanotubes, and the catalyst in a reaction kettle. Under a nitrogen atmosphere, at a temperature of 175°C and a rotation speed of 800 r / min, stir and react for 2 h. Then, raise the temperature to 210°C and keep it warm until the acid value reaches 6 mgKOH / g;

[0031] (4) Then, add ethylene glycol and maleic anhydride to the reaction kettle. Under the condition of a temperature of 175°C and a rotation speed of 800 r / min, stir and react for 30 min. Then, raise the temperature to 210°C and keep it warm until the acid value reaches 63 mgKOH / g;

[0032] (5) Subsequently, add the modified rosin to the reaction kettle. Under the condition of a temperature of 220°C and a rotation speed of 800 r / min, keep it warm and react for 2 h. Then, raise the temperature to 210°C and keep it warm until the acid value reaches 45 mgKOH / g;

[0033] Cool down to 80 °C, add triphenyl phosphite, hydroquinone and styrene, and stir and blend at a rotation speed of 600 r / min. Then cool down to 50 °C to obtain the corrosion-resistant conductive coating.

[0034] The catalyst in step (2) is prepared by mixing antimony glycolate, tetrabutyl titanate, stannous octoate, and monobutyltin oxide in a mass ratio of 1:2:3:1.

[0035] Example 2

[0036] (1) By weight, take 26 parts of rosin powder, 70 parts of hydroquinone, and 30 parts of acrylic acid. Place the rosin powder and hydroquinone in a reactor, and under a nitrogen atmosphere, at a temperature of 170 °C and a rotation speed of 1000 r / min, stir and mix for 30 min. Then raise the temperature to 220 °C, and then dropwise add acrylic acid. The dropping time is controlled within 1.2 h. After the addition of acrylic acid is completed, raise the temperature to 240 °C, and under a rotation speed of 900 r / min, stir and react for 40 min, and then cool down to 170 °C to obtain the modified rosin.

[0037] (2) By weight, take 30 parts of isophthalic acid, 40 parts of carbon nanotubes, 30 parts of ethylene glycol, 80 parts of maleic anhydride, 8 parts of modified rosin, 80 parts of styrene, 6 parts of hydroquinone, 2 parts of catalyst, and 3 parts of triphenyl phosphite;

[0038] (3) Place isophthalic acid, carbon nanotubes, and the catalyst in a reaction kettle, and under a nitrogen atmosphere, at a temperature of 185 °C and a rotation speed of 600 r / min, stir and react for 2 h. Then raise the temperature to 220 °C for heat preservation until the acid value reaches 5 mg KOH / g;

[0039] (4) Then add ethylene glycol and maleic anhydride to the reaction kettle, and under a temperature of 175 °C and a rotation speed of 600 r / min, stir and react for 50 min. Then raise the temperature to 220 °C for heat preservation reaction until the acid value reaches 63 mg KOH / g;

[0040] (5) Subsequently, add the modified rosin to the reaction kettle, and under a temperature of 210 °C and a rotation speed of 1000 r / min, heat-preserve and react for 2 h. Then raise the temperature to 230 °C for heat preservation until the acid value reaches 40 mg KOH / g;

[0041] (6) Cool down to 80 °C, add triphenyl phosphite, hydroquinone and styrene, and stir and blend at a rotation speed of 600 r / min. Then cool down to 50 °C to obtain the corrosion-resistant conductive coating.

[0042] The catalyst in step (2) is prepared by mixing antimony glycolate, tetrabutyl titanate, stannous octoate, and monobutyltin oxide in a mass ratio of 1:2:3:1.

[0043] Example 3

[0044] (1) By weight, take 30 parts of rosin powder, 60 parts of hydroquinone, and 30 parts of acrylic acid. Place the rosin powder and hydroquinone in a reactor. Under a nitrogen atmosphere, at a temperature of 175 °C and a rotation speed of 1000 r / min, stir and mix for 30 min. Then, raise the temperature to 210 °C, and then dropwise add acrylic acid. The dropping time is controlled at 1.5 h. After the addition of acrylic acid is completed, raise the temperature to 248 °C. Under the condition of a rotation speed of 1000 r / min, stir and react for 40 min, and then cool down to 170 °C to obtain modified rosin.

[0045] (2) By weight, take 30 parts of isophthalic acid, 50 parts of carbon nanotubes, 20 - 30 parts of ethylene glycol, 60 - 80 parts of maleic anhydride, 8 - 10 parts of modified rosin, 60 - 80 parts of styrene, 5 - 6 parts of hydroquinone, 2 - 3 parts of catalyst, and 2 - 3 parts of triphenyl phosphite;

[0046] (3) Place isophthalic acid, carbon nanotubes, and the catalyst in a reaction kettle. Under a nitrogen atmosphere, at a temperature of 175 °C and a rotation speed of 700 r / min, stir and react for 2 h. Then, raise the temperature to 210 °C and keep it warm until the acid value reaches 4 mgKOH / g;

[0047] (4) Then, add ethylene glycol and maleic anhydride to the reaction kettle. Under the condition of a temperature of 175 °C and a rotation speed of 600 r / min, stir and react for 40 min. Then, raise the temperature to 220 °C and keep it warm until the acid value reaches 58 mgKOH / g;

[0048] (5) Subsequently, add the modified rosin to the reaction kettle. Under the condition of a temperature of 220 °C and a rotation speed of 1000 r / min, keep it warm and react for 1 h. Then, raise the temperature to 210 °C and keep it warm until the acid value reaches 45 mgKOH / g;

[0049] (6) Cool down to 80 °C, add triphenyl phosphite, hydroquinone, and styrene, and stir and blend under the condition of a rotation speed of 800 r / min. Then, cool down to 40 - 50 °C to obtain a corrosion - resistant conductive coating.

[0050] The catalyst in step (2) is prepared by mixing antimony glycolate, tetrabutyl titanate, stannous octoate, and monobutyltin oxide in a mass ratio of 1:2:3:1.

[0051] Comparative Example 1

[0052] (1) By weight, take 30 parts of isophthalic acid, 50 parts of carbon nanotubes, 20 - 30 parts of ethylene glycol, 60 - 80 parts of maleic anhydride, 8 - 10 parts of rosin, 60 - 80 parts of styrene, 5 - 6 parts of hydroquinone, 2 - 3 parts of catalyst, and 2 - 3 parts of triphenyl phosphite;

[0053] (2) Place isophthalic acid, carbon nanotubes and a catalyst in a reaction kettle. Under a nitrogen atmosphere, at a temperature of 175 °C and a rotation speed of 700 r / min, stir and react for 2 h. Then raise the temperature to 210 °C for heat preservation and react until the acid value reaches 4 mgKOH / g;

[0054] (3) Then add ethylene glycol and maleic anhydride to the reaction kettle. Under the conditions of a temperature of 175 °C and a rotation speed of 600 r / min, stir and react for 40 min. Then raise the temperature to 220 °C for heat preservation reaction and react until the acid value reaches 58 mgKOH / g;

[0055] (4) Subsequently, add rosin to the reaction kettle. Under the conditions of a temperature of 220 °C and a rotation speed of 1000 r / min, conduct a heat preservation reaction for 1 h. Then raise the temperature to 210 °C for heat preservation and react until the acid value reaches 45 mgKOH / g;

[0056] (5) Cool down to 80 °C, add triphenyl phosphite, hydroquinone and styrene, and stir and blend under the condition of a rotation speed of 800 r / min. Then cool down to 40 - 50 °C to obtain the corrosion-resistant conductive coating.

[0057] In step (1), the catalyst is prepared by mixing antimony glycolate, tetrabutyl titanate, stannous octoate and monobutyltin oxide according to a mass ratio of 1:2:3:1.

[0058] Comparative Example 2

[0059] (1) By weight, take 30 parts of isophthalic acid, 50 parts of carbon nanotubes, 20 - 30 parts of ethylene glycol, 60 - 80 parts of maleic anhydride, 60 - 80 parts of styrene, 5 - 6 parts of hydroquinone, 2 - 3 parts of catalyst, and 2 - 3 parts of triphenyl phosphite;

[0060] (2) Place isophthalic acid, carbon nanotubes and a catalyst in a reaction kettle. Under a nitrogen atmosphere, at a temperature of 175 °C and a rotation speed of 700 r / min, stir and react for 2 h. Then raise the temperature to 210 °C for heat preservation and react until the acid value reaches 4 mgKOH / g;

[0061] (3) Then add ethylene glycol and maleic anhydride to the reaction kettle. Under the conditions of a temperature of 175 °C and a rotation speed of 600 r / min, stir and react for 40 min. Then raise the temperature to 220 °C for heat preservation reaction and react until the acid value reaches 58 mgKOH / g;

[0062] (4) Cool down to 80 °C, add triphenyl phosphite, hydroquinone and styrene, and stir and blend under the condition of a rotation speed of 800 r / min. Then cool down to 40 - 50 °C to obtain the corrosion-resistant conductive coating.

[0063] Step (1) The catalyst is prepared by mixing antimony glycolate, tetrabutyl titanate, stannous octoate, and monobutyltin oxide in a mass ratio of 1:2:3:1.

[0064] Detection method: Coating is carried out using this product, left standing at 60 - 70 °C for 20 - 30 min, then heated to 90 - 100 °C and left standing for 20 - 30 min, and after cooling to room temperature, left standing for another 20 - 24 h.

[0065] (1) Elongation at break (GB / T2568 - 1995); Tensile strength (GB / T2568 - 1995); Flexural strength (GB / T2570 - 1995)

[0066] Table 1:

[0067]

[0068] It can be seen from the comparison between Examples 1 - 3 and Comparative Examples 1 - 3 in Table 1 that in the present invention, rosin is added in the later stage of the condensation reaction. Mainly, esterification reaction is used for end - capping to destroy the symmetry of the polyester molecular structure, reduce the crystallization ability of the polyester, which is beneficial to the compatibility between isophthalic polyester and styrene. In addition, due to the structure of rosin itself, it has good compatibility with styrene. End - capping with benzoic acid cannot well solve the compatibility problem between isophthalic polyester and styrene, while using rosin for end - capping can well solve this problem. The improvement of compatibility further enhances the mechanical properties of the system.

[0069] (2) The chemical corrosion resistance of the resin is in accordance with GB / T3857 - 2005

[0070] Table 2

[0071]

[0072]

[0073] Table 3

[0074]

[0075] Table 4

[0076]

[0077] Table 5

[0078]

[0079] Table 6

[0080]

[0081] As can be seen from the data in Table 2-6, in the present invention, the main component of rosin is abietic acid. By addition with acrylic acid, hydrophilic groups can be introduced for modification. When rosin is heated or under the action of organic acids or inorganic acids, the abietic-type resin acids contained in its composition will be isomerized under external stimuli to form levopimaric acid, which has resonance double bonds. This isomerization reaction is often reversible, that is, it can reach an equilibrium state under unchanged external conditions, and then undergoes a D-A addition with acrylic acid, thereby converting monocarboxylic acid into dicarboxylic acid. During the process of using modified rosin for end-capping, more esterification reactions can occur with the hydroxyl groups in the system, thus achieving further end-capping and improving the water resistance, acid resistance and alkali resistance of the system.

[0082] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

[0083] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

Claims

1. A method for processing a corrosion-resistant conductive coating, characterized in that: The processing method of the corrosion-resistant conductive coating is: (1) taking isophthalic acid, carbon nanotubes, ethylene glycol, maleic anhydride, rosin, styrene, inhibitor, catalyst, and antioxidant; (2) mixing isophthalic acid, carbon nanotubes and a catalyst, stirring for reaction, and keeping the temperature for reaction; (3) then adding ethylene glycol and maleic anhydride, stirring to react, then raising the temperature, and keeping the temperature to react; (4) adding rosin, keeping the temperature for reaction, then raising the temperature, keeping the temperature for reaction; (5) Cooling, adding antioxidant, polymerization inhibitor and styrene, stirring and blending, and then cooling to obtain a corrosion-resistant conductive coating.

2. A method for processing a corrosion-resistant conductive coating according to claim 1, characterized in that: The specific processing method of the corrosion-resistant conductive coating is: (1) By weight, 20-30 parts of isophthalic acid, 40-60 parts of carbon nanotubes, 20-30 parts of ethylene glycol, 60-80 parts of maleic anhydride, 8-10 parts of rosin, 60-80 parts of styrene, 5-6 parts of inhibitor, 2-3 parts of catalyst, and 2-3 parts of antioxidant; (2) placing isophthalic acid, carbon nanotubes and a catalyst in a reaction kettle, stirring and reacting for 1-2 hours under a nitrogen atmosphere at a temperature of 175-185° C. and a rotation speed of 600-800 r / min, then heating to 210-230° C. and maintaining the temperature until the acid value reaches 3-6 mgKOH / g; (3) then adding ethylene glycol and maleic anhydride to the reaction kettle, stirring and reacting for 30-50 minutes at a temperature of 165-175° C. and a rotation speed of 600-800 r / min, then raising the temperature to 210-220° C. and keeping the temperature to react until the acid value reaches 58-63 mgKOH / g; (4) Then, rosin is added to the reaction kettle, and the reaction is carried out at a temperature of 210-220° C. and a rotation speed of 800-1000 r / min for 1-2 hours, and then the temperature is raised to 210-230° C. and the reaction is carried out until the acid value reaches 40-45 mgKOH / g; (5) Cooling to 70-80°C, adding antioxidant, polymerization inhibitor and styrene, stirring and blending at a rotation speed of 600-800 r / min, and then cooling to 40-50°C to obtain a corrosion-resistant conductive coating.

3. A method for processing a corrosion-resistant conductive coating according to claim 2, characterized in that: The catalyst described in step (1) is prepared by mixing antimony ethylene glycol, tetrabutyl titanate, stannous octoate and monobutyl tin oxide in a mass ratio of 1:2:3:

1.

4. A method for processing a corrosion-resistant conductive coating according to claim 3, characterized in that: The inhibitor in step (1) is hydroquinone.

5. A method for processing a corrosion-resistant conductive coating according to claim 4, characterized in that: The antioxidant in step (1) is triphenyl phosphite.

6. A method for processing a corrosion-resistant conductive coating according to claim 5, characterized in that: The rosin in step (1) may also be modified rosin.

7. A method for processing a corrosion-resistant conductive coating according to claim 6, characterized in that: The preparation method of the modified rosin is as follows: 20-30 parts of rosin powder, 60-80 parts of hydroquinone and 20-30 parts of acrylic acid are taken by weight, the rosin powder and the hydroquinone are placed in a reactor, and stirred and mixed for 20-30 minutes under a nitrogen atmosphere at a temperature of 170-180° C. and a rotation speed of 800-1000 r / min, and then the temperature is raised to 210-220° C., and then acrylic acid is added dropwise, and the dropping time is controlled to be 1.2-1.5 hours. After the acrylic acid is added dropwise, the temperature is raised to 240-248° C., and the reaction is stirred for 30-50 minutes at a rotation speed of 800-1000 r / min, and then the temperature is lowered to 170-180° C. to obtain the modified rosin.

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