Acrylic epoxy industrial paint emulsion and preparation method thereof

Abstract

The present application provides an acrylic epoxy industrial paint emulsion and a preparation method thereof. The acrylic ester monomer is modified by adding epoxy resin during the preparation process, and the reaction stability of the preparation process is improved by adding ingredients such as rosin and baking soda and controlling the process, so as to promote the full reaction of various additives, thereby preparing an environmentally friendly water-based paint emulsion with deionized water and acrylic ester monomer as main components. The production process is simple, environmentally friendly and controllable. While maintaining good impact resistance, hardness, flexibility and other properties, the salt spray resistance of the emulsion is greatly improved, thereby significantly improving the industrial anti-corrosion performance of the emulsion. When realizing industrial anti-corrosion, a good anti-corrosion effect can be achieved without using an anti-corrosion primer, thereby simplifying the industrial anti-corrosion process and reducing the overall anti-corrosion cost.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to an acrylic epoxy industrial paint emulsion and a preparation method thereof. Background Art

[0002] Acrylic emulsion is an emulsion copolymerized from various acrylic ester monomers. It is a small-particle, multi-purpose emulsion that can be used to prepare a variety of coatings. It has good water resistance, alkali resistance and antifouling properties. However, due to the poor salt spray resistance of pure acrylic ester monomers, its application range in industrial paints is relatively small. It often needs to be used with anticorrosive primers, resulting in complex industrial anticorrosion processes and high costs. Most existing technologies modify acrylic acid by adding various additives to improve its anticorrosion properties, but most of them have complex ingredients and there are environmental issues in the preparation and use process due to the addition of organic volatile agents. Summary of the invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, the present application aims to provide an acrylic epoxy industrial paint emulsion and a preparation method, by modifying the acrylate monomer by adding epoxy resin during the preparation process, by adding ingredients such as rosin and baking soda and controlling the process to improve the stability of the preparation process reaction and the product performance, while maintaining good impact resistance, hardness, flexibility and other properties, the salt spray resistance of the emulsion is greatly improved, thereby significantly improving the industrial anti-corrosion performance of the emulsion.

[0004] The present application provides a method for preparing an acrylic epoxy industrial paint emulsion, which is prepared from the following raw materials in parts by weight:

[0005]

[0006]

[0007] Preferably, the acrylate monomer is composed of the following raw materials in parts by weight:

[0008]

[0009] Preferably, the industrial paint emulsion further comprises 0.2 to 0.5 parts of a defoamer, and the defoamer is mineral oil.

[0010] Preferably, the epoxy resin is commercially available EP-20 epoxy resin;

[0011] Preferably, the emulsifier is sodium salt of allyl ether sulfonate.

[0012] Preferably, the emulsifier is alkylphenol ethoxylate ammonium sulfate.

[0013] Preferably, the nonionic surfactant is nonylphenol polyoxyethylene ether.

[0014] Preferably, the protective glue is sodium methacrylate.

[0015] Preferably, the initiator is sodium persulfate.

[0016] Specifically, after the pH value of the emulsion is adjusted by a traditional amine auxiliary agent, the storage stability of the emulsion will deteriorate during the later storage and use due to the volatilization of the amine auxiliary agent, while the pH value of the emulsion can be kept stable during the later storage and use by adjusting the pH value of the emulsion with baking soda, thereby improving the storage stability of the emulsion; the rosin is mainly used to increase the viscosity of the emulsion, improve the bonding strength and the flexibility of the paint film after curing; the epoxy resin is used to improve the salt spray resistance of the emulsion.

[0017] Preferably, the method comprises the following steps:

[0018] Mix methyl methacrylate, styrene and butyl acrylate to obtain a mixed solution A;

[0019] Adding rosin and epoxy resin to mixed solution A to obtain mixed solution B;

[0020] Mix baking soda, deionized water, emulsifier 1, emulsifier 2, and nonionic surfactant to obtain mixed solution C;

[0021] Mixing mixed solution B and mixed solution C to obtain mixed solution D;

[0022] Mixing protective glue, methacrylic acid, deionized water, emulsifier 1, emulsifier 2, and nonionic surfactant to obtain a mixed solution E;

[0023] Divide the mixed solution D into two parts, obtaining mixed solution D1 and mixed solution D2;

[0024] Mixing the mixed solution D2 and the mixed solution E to obtain a mixed solution F;

[0025] Mixing mixed solution D1, initiator and deionized water to obtain mixed solution G;

[0026] Mixing mixed solution G and mixed solution F to obtain mixed solution H;

[0027] The mixed solution H is filtered to obtain the finished emulsion.

[0028] Specifically, baking soda, deionized water, emulsifier 1, emulsifier 2, and non-ionic surfactant are mixed, and stirred for 2.5 to 4 hours to obtain a mixed solution C; protective glue, methacrylic acid, deionized water, emulsifier 1, emulsifier 2, and non-ionic surfactant are mixed, and stirred for 1 to 1.5 hours to obtain a mixed solution E.

[0029] Preferably, the weight ratio of the mixed liquid D1 to the mixed liquid D2 is (8-9):(1-2).

[0030] Preferably, after the mixed solution D2 and the mixed solution E are mixed, the mixture is heated to 60° C., an initiator and deionized water are added and stirred for 30 to 60 minutes to obtain a mixed solution F.

[0031] Specifically, the mixed liquid D is divided into mixed liquid D1 and mixed liquid D2, and the initiator is divided into two parts, one part is directly added to the reactor to prepare mixed liquid F, and the other part is added to the mixed liquid D1 in advance to prepare mixed liquid G, which can reduce the intensity of the reaction in the reactor. The mixed liquid D1 is mixed with the initiator in advance and then added dropwise to the reactor, which makes the reaction more gentle and sufficient, reduces the waste residue generated during the reaction process, and improves the yield and quality of the emulsion.

[0032] Preferably, the temperature is maintained at 60-70° C. during the mixing of the mixed solution G and the mixed solution F, and the temperature is kept for 1 hour after the mixing is completed to obtain the mixed solution H.

[0033] Preferably, before filtering the mixed solution H, a defoaming agent is added to the mixed solution H and the mixed solution H is cooled to 20-25°C.

[0034] Specifically, before adding the defoaming agent to the mixed liquid H, the mixed liquid H is cooled to 40-50° C., and then the defoaming agent is added to the mixed liquid H and stirred, and then cooled to 20-25° C. and filtered; the defoaming agent is mineral oil.

[0035] Preferably, the mixed solution G is added to the mixed solution F in a dropwise manner, and the dropwise addition time is 2.5 to 3.5 hours.

[0036] Specifically, the mixed solution G needs to be added to the mixed solution F within 2.5 to 3.5 hours, so as to ensure the preparation efficiency and avoid the problem of violent reaction and insufficient reaction caused by adding the mixed solution G to the mixed solution F in a short time.

[0037] In summary, the present application discloses an acrylic epoxy industrial paint emulsion and a preparation method. The beneficial effect produced based on the above scheme is that the acrylate monomer is modified by adding epoxy resin during the preparation process, the stability of the reaction in the preparation process is improved by adding ingredients such as rosin and baking soda and controlling the process, and various additives are prompted to react fully, so as to prepare an environmentally friendly water-based paint emulsion with deionized water and acrylate monomer as main components. The production process is simple, environmentally friendly and controllable. While maintaining good impact resistance, hardness, flexibility and other properties, the salt spray resistance of the emulsion is greatly improved, thereby significantly improving the industrial anti-corrosion performance of the emulsion, and achieving good anti-corrosion effect without using an anti-corrosion primer when realizing industrial anti-corrosion, simplifying the industrial anti-corrosion process and reducing the overall anti-corrosion cost. DETAILED DESCRIPTION

[0038] The present application is further described in detail below in conjunction with the examples. It is to be understood that the specific embodiments described herein are only used to explain the related inventions, rather than to limit the invention. To those skilled in the art, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the field to which the present invention belongs. The present application is described in detail below in conjunction with the examples.

[0039] Example 1

[0040] An acrylic epoxy industrial paint emulsion is prepared from the following raw materials in parts by weight:

[0041]

[0042] The pH value of the emulsion is adjusted by baking soda, so as to keep the pH value of the emulsion stable during storage and use, thereby improving the storage stability of the emulsion; the rosin is mainly used to increase the viscosity of the emulsion, improve the bonding strength and the flexibility of the paint film after curing; the epoxy resin is used to improve the salt spray resistance of the emulsion.

[0043] The epoxy resin is EP-20; the emulsifier 1 is sodium salt of propylene ether sulfonate; the emulsifier 2 is ammonium sulfate of alkylphenol ethoxylate; the nonionic surfactant is nonylphenol polyoxyethylene ether; the protective glue is sodium methacrylate; the defoamer is mineral oil; and the initiator is sodium persulfate.

[0044] Furthermore, the acrylate monomer is composed of the following raw materials in parts by weight:

[0045]

[0046] Furthermore, the industrial paint emulsion also includes 0.2 to 0.5 parts of a defoamer, and the defoamer is mineral oil.

[0047] Example 2

[0048] A method for preparing the acrylic epoxy industrial paint emulsion as in Example 1 comprises the following steps:

[0049] Take by weight 80 parts of methyl methacrylate; 175 parts of styrene; 125 parts of butyl acrylate; 100 parts of epoxy resin; 20 parts of rosin; 500 parts of deionized water; 2 parts of emulsifier 1; 4 parts of emulsifier 2; 5 parts of nonionic surfactant; 7 parts of protective glue; 3 parts of methacrylic acid; 5 parts of initiator; 3 parts of baking soda; 0.25 parts of defoaming agent;

[0050] Add 80 parts of methyl methacrylate, 175 parts of styrene and 125 parts of butyl acrylate into a dissolving tank and stir evenly to obtain a mixed solution A;

[0051] Add 20 parts of rosin and 100 parts of epoxy resin to mixed solution A, stir and dissolve for 3 hours to obtain mixed solution B;

[0052] Take 3 parts of baking soda, 160 parts of deionized water, 1 part of emulsifier 1, 3 parts of emulsifier 2, and 4 parts of non-ionic surfactant and add them into an emulsification tank, and stir for 3 hours to obtain a mixed solution C;

[0053] Add mixed solution B into the emulsification tank, mix with mixed solution C and stir for 40 minutes to obtain mixed solution D, and divide mixed solution D into two parts to obtain mixed solution D1 and mixed solution D2, wherein the weight ratio of mixed solution D1 to mixed solution D2 is 17:3;

[0054] Take 7 parts of protective glue, 3 parts of methacrylic acid, 320 parts of deionized water, 1 part of emulsifier 1, 1 part of emulsifier 2, and 1 part of non-ionic surfactant and add them into the reactor, stir for 1 hour, and obtain the mixed solution E;

[0055] Mixed solution D2 was added to the reactor and mixed with mixed solution E. After heating to 60°C, 1 part of initiator and 5 parts of deionized water were added. Stirring was continued and the liquid level and the wall of the reactor were observed. After seeing the blue light, stirring was continued for 30 minutes (without reflux) to obtain mixed solution F.

[0056] Take 4 parts of initiator and 15 parts of deionized water, add them into the emulsification tank, mix with the mixed solution D1 and stir evenly to obtain the mixed solution G;

[0057] Add all the mixed solution G to the mixed solution F by dropping, keep stirring and dropping for 3 hours, and then keep warm for 1 hour to obtain mixed solution H. The temperature is controlled at 60-70°C during the dropping and keeping warm process;

[0058] The mixed solution was cooled to 45°C, and then 0.25 parts of defoamer were added, and stirring was continued for 10 minutes. The mixed solution was cooled to 25°C and filtered to obtain a finished emulsion. The pH value was tested to be 8.

[0059] Example 3

[0060] A method for preparing the acrylic epoxy industrial paint emulsion as in Example 1 comprises the following steps:

[0061] Take 83 parts of methyl methacrylate, 170 parts of styrene, 130 parts of butyl acrylate, 100 parts of epoxy resin, 20 parts of rosin, 500 parts of deionized water, 2 parts of emulsifier 1, 4 parts of emulsifier 2, 5 parts of nonionic surfactant, 7 parts of protective glue, 3 parts of methacrylic acid, 5 parts of initiator, 3 parts of baking soda, and 0.25 parts of defoamer.

[0062] Add 83 parts of methyl methacrylate, 170 parts of styrene and 130 parts of butyl acrylate into a dissolving tank and stir evenly to obtain a mixed solution A;

[0063] Add 20 parts of rosin and 100 parts of epoxy resin to mixed solution A, stir and dissolve for 3 hours to obtain mixed solution B;

[0064] Take 3 parts of baking soda, 160 parts of deionized water, 1 part of emulsifier 1, 3 parts of emulsifier 2, and 4 parts of non-ionic surfactant and add them into an emulsification tank, and stir for 3 hours to obtain a mixed solution C;

[0065] Add mixed solution B into the emulsification tank, mix with mixed solution C and stir for 40 minutes to obtain mixed solution D, and divide mixed solution D into two parts to obtain mixed solution D1 and mixed solution D2, wherein the weight ratio of mixed solution D1 to mixed solution D2 is 9:1;

[0066] Take 7 parts of protective glue, 3 parts of methacrylic acid, 320 parts of deionized water, 1 part of emulsifier 1, 1 part of emulsifier 2, and 1 part of non-ionic surfactant and add them into the reactor, stir for 1.5 hours, and obtain the mixed solution E;

[0067] Mixed solution D2 was added to the reactor and mixed with mixed solution E. After heating to 60°C, 1 part of initiator and 5 parts of deionized water were added. Stirring was continued and the liquid level and the wall of the reactor were observed. After seeing the blue light, stirring was continued for 40 minutes (without reflux) to obtain mixed solution F.

[0068] Take 4 parts of initiator and 15 parts of deionized water, add them into the emulsification tank, mix with the mixed solution D1 and stir evenly to obtain the mixed solution G;

[0069] Add all the mixed solution G to the mixed solution F by dropping, continue stirring and dropping for 2.5 hours, and then keep warm for 1 hour to obtain mixed solution H. The temperature is controlled at 60-70°C during the dropping and keeping warm process;

[0070] The mixed solution was cooled to 45°C, and then 0.25 parts of defoamer were added, and stirring was continued for 10 minutes. The mixed solution was cooled to 20°C and filtered to obtain a finished emulsion. The pH value was tested to be 9.

[0071] Example 4

[0072] A method for preparing the acrylic epoxy industrial paint emulsion as in Example 1 comprises the following steps:

[0073] Take 85 parts of methyl methacrylate, 180 parts of styrene, 120 parts of butyl acrylate, 120 parts of epoxy resin, 20 parts of rosin, 500 parts of deionized water, 2 parts of emulsifier 1, 4 parts of emulsifier 2, 5 parts of nonionic surfactant, 7 parts of protective glue, 3 parts of methacrylic acid, 5 parts of initiator, 3 parts of baking soda, and 0.25 parts of defoamer.

[0074] Add 85 parts of methyl methacrylate, 180 parts of styrene and 120 parts of butyl acrylate into a dissolving tank and stir evenly to obtain a mixed solution A;

[0075] Add 20 parts of rosin and 120 parts of epoxy resin to mixed solution A, stir and dissolve for 3 hours to obtain mixed solution B;

[0076] Take 3 parts of baking soda, 160 parts of deionized water, 1 part of emulsifier 1, 3 parts of emulsifier 2, and 4 parts of non-ionic surfactant and add them into an emulsification tank, and stir for 3 hours to obtain a mixed solution C;

[0077] Add mixed solution B into the emulsification tank, mix with mixed solution C and stir for 40 minutes to obtain mixed solution D, and divide mixed solution D into two parts to obtain mixed solution D1 and mixed solution D2, wherein the weight ratio of mixed solution D1 to mixed solution D2 is 4:1;

[0078] Take 7 parts of protective glue, 3 parts of methacrylic acid, 320 parts of deionized water, 1 part of emulsifier 1, 1 part of emulsifier 2, and 1 part of non-ionic surfactant and add them into the reactor, stir for 1.5 hours, and obtain the mixed solution E;

[0079] Mixed solution D2 was added to the reactor and mixed with mixed solution E. After heating to 60°C, 1 part of initiator and 5 parts of deionized water were added. Stirring was continued and the liquid level and the wall of the reactor were observed. After seeing the blue light, stirring was continued for 50 minutes (without reflux) to obtain mixed solution F.

[0080] Take 4 parts of initiator and 15 parts of deionized water, add them into the emulsification tank, mix with the mixed solution D1 and stir evenly to obtain the mixed solution G;

[0081] Add all the mixed solution G to the mixed solution F by dropping, continue stirring and dropping for 3.5 hours, and then keep warm for 1 hour to obtain mixed solution H. The temperature is controlled at 60-70°C during the dropping and keeping warm process;

[0082] The mixed solution was cooled to 45°C, and then 0.25 parts of defoamer were added, and stirring was continued for 10 minutes. The mixed solution was cooled to 25°C and filtered to obtain a finished emulsion, and the pH value was tested to be 8.

[0083] According to the method specified in GBT 1771-2007 "Determination of neutral salt spray resistance of paints and varnishes", the finished emulsions of Example 2, Example 3, and Example 4 and four commercially available emulsions No. 1, No. 2, No. 3, and No. 4 were tested for salt spray performance. The emulsion No. 1 is Dow HG100, the emulsion No. 2 is Dow HG300, the emulsion No. 3 is Wanhua 0612, and the emulsion No. 4 is Xinguang acrylic emulsion. The test results are shown in Table 1. It can be seen that when the emulsions of Examples 1, 2, and 3 of the present application are used for salt spray tests, the time when the scratch corrosion exceeds 1 mm and the time when the scratch corrosion exceeds 2 mm is much longer than the four commercially available emulsions, and the time when the plate surface rusts 3% and the plate surface rusts 5% is also much longer than the four commercially available emulsions, indicating that the emulsion of the present application has greatly improved the salt spray resistance of the emulsion while maintaining good water resistance, alkali resistance, and antifouling properties, thereby significantly improving the industrial anticorrosion performance of the emulsion. Moreover, after testing, the adhesion, hardness, impact resistance, and flexibility of the emulsions of Examples 1, 2, and 3 of the present application are basically the same as those of the four commercially available emulsions, as shown in Table 2, indicating that while the present application maintains good salt spray resistance, other physical indicators have not been reduced.

[0084] Table 1

[0085]

[0086] Table 2

[0087]

[0088]

[0089] It can be seen from the above embodiments that the present application provides an acrylic epoxy industrial paint emulsion and a preparation method, which modifies the acrylate monomer by adding epoxy resin during the preparation process, improves the stability of the preparation process reaction and the emulsion product by adding ingredients such as rosin and baking soda and controlling the process, and promotes the full reaction of various additives to prepare an environmentally friendly water-based paint emulsion with deionized water and acrylate monomers as main components, and the production process is simple, environmentally friendly and controllable. While maintaining good impact resistance, hardness, flexibility and other properties, the salt spray resistance of the emulsion is greatly improved, thereby significantly improving the industrial anti-corrosion performance of the emulsion, and achieving good anti-corrosion effect without using an anti-corrosion primer when realizing industrial anti-corrosion, simplifying the industrial anti-corrosion process and reducing the overall anti-corrosion cost.

[0090] The above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A method for preparing an acrylic epoxy industrial paint emulsion, characterized in that: The emulsion is prepared from the following raw materials in parts by weight: 372-400 parts of polymerization monomer; Epoxy resin 100-120 parts; 20-22 parts of rosin; 480~510 parts of deionized water; Emulsifier: 2~3 parts; Emulsifier 2 4~5 parts; 5-6 parts of nonionic surfactant; 6~8 parts of protective glue; 4~5 parts of initiator; 2~5 parts baking soda; Wherein, the polymerization monomer is composed of the following raw materials in parts by weight: 80-85 parts of methyl methacrylate; 170-180 parts of styrene; 120-130 parts of butyl acrylate; 2-5 parts of methacrylic acid; The epoxy resin is EP-20; the emulsifier 1 is sodium salt of propylene ether sulfonate; the emulsifier 2 is ammonium sulfate of alkylphenol ethoxylate; the nonionic surfactant is nonylphenol polyoxyethylene ether; the protective glue is sodium methacrylate; the initiator is sodium persulfate; The method comprises the following steps: Mix methyl methacrylate, styrene and butyl acrylate to obtain a mixed solution A; Adding rosin and epoxy resin to mixed solution A to obtain mixed solution B; Mix baking soda, deionized water, emulsifier 1, emulsifier 2, and nonionic surfactant to obtain mixed solution C; Mixing mixed solution B and mixed solution C to obtain mixed solution D; Mixing protective glue, methacrylic acid, deionized water, emulsifier 1, emulsifier 2, and nonionic surfactant to obtain a mixed solution E; The mixed solution D is divided into two parts to obtain a mixed solution D1 and a mixed solution D2; the weight ratio of the mixed solution D1 to the mixed solution D2 is (8-9): (1-2); After mixing the mixed solution D2 and the mixed solution E, the mixture is heated to 60°C, and the initiator and deionized water are added and stirred for 30-60 minutes to obtain a mixed solution F; Mixing mixed solution D1, initiator and deionized water to obtain mixed solution G; Mixing the mixed solution G and the mixed solution F to obtain a mixed solution H; wherein the mixed solution G is added to the mixed solution F in a dropwise manner for 2.5 to 3.5 hours; the temperature is maintained at 60 to 70° C. during the mixing of the mixed solution G and the mixed solution F, and the temperature is maintained for 1 hour after the mixing is completed to obtain a mixed solution H; The mixed solution H is filtered to obtain the finished emulsion.

2. The method for preparing an acrylic epoxy industrial paint emulsion according to claim 1, characterized in that: Before filtering the mixed solution H, a defoaming agent is added to the mixed solution H, and the mixed solution H is cooled to 20-25°C.

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