Water-based acrylic resin emulsion for quick-drying plastic ink and preparation method of water-based acrylic resin emulsion

Abstract

According to the quick-drying water-based acrylic resin emulsion for the plastic printing ink and the preparation method thereof, when the core-shell emulsion is designed, the drying speed of the water-based acrylic resin emulsion for the plastic printing ink is regulated and controlled by changing the content of the hard monomer in the core-shell component; meanwhile, a cross-linking monomer capable of improving the drying speed of the emulsion is also added, so that the drying speed of the plastic ink is controllable by designing the water-based acrylic resin emulsion with different core-shell ratios, the process is relatively simple, the emulsion stability is good, and the cost is low. The prepared water-based acrylic resin emulsion for the quick-drying plastic ink has relatively good adhesive force and printing performance.

Description

Technical Field

[0001] The invention relates to a water-based acrylic resin emulsion for quick-drying plastic ink and a preparation method thereof. Background Art

[0002] At present, under the background of increasing pressure on environmental protection and sustainable development, water-based plastic inks are gradually gaining attention from the industry as an environmentally friendly alternative to solvent-based inks. There are many types of plastics at present, such as polypropylene plastic (PP) with low surface energy, which has a small specific gravity and is non-toxic, and is used in large quantities in food packaging, household appliances, etc. However, water-based plastic inks use water as a solvent. During coating, due to the high surface tension of water, it is not easy to spread on plastic substrates, and plastic substrates have a low water absorption capacity. Therefore, in order to improve printing efficiency, water-based plastic inks are required to achieve a faster drying speed on plastic substrates.

[0003] At present, there are two main ways to increase the drying speed of water-based plastic inks: one is to use a drying agent, but this increases the cost, and the drying agent is mainly an oil-soluble organic metal salt, which often contains heavy metals such as lead, cobalt, and manganese, and has poor compatibility with water-based resins; the other is to prepare a binder containing alcohols, a common example being a water-based acrylic resin emulsion, such as Chinese patent CN1789346A, which uses 8-12% ethanol solvent, and ethanol has certain flammability and volatility, so strictly speaking, this patent does not belong to the category of water-based plastic inks. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for preparing a water-based acrylic resin emulsion for quick-drying plastic ink, and to prepare a water-based acrylic resin emulsion for quick-drying plastic ink with adjustable drying speed by designing the polymer molecular structure at the molecular level, that is, by different contents of hard monomers in the core-shell components.

[0005] In order to solve the above technical problems, the technical solution of the present invention is:

[0006] A method for preparing a quick-drying water-based acrylic resin emulsion for plastic ink comprises the following steps:

[0007] S1. In a container 1, dissolve the emulsifier in deionized water, heat to 75-80°C and stir to obtain an emulsifier solution;

[0008] S2. Weigh styrene, acrylic acid monomer, methyl methacrylate, isooctyl acrylate, tripropylene glycol diacrylate in container II and stir to obtain a core component;

[0009] S3. Remove 1 / 10 weight of the core component from container two and add it to container one and stir for 10-20 minutes;

[0010] S4. In container three, the initiator was added to deionized water and stirred to obtain an initiator solution;

[0011] S5. Weigh styrene, acrylic acid monomer, methyl methacrylate, isooctyl acrylate in container IV and stir to obtain a shell component;

[0012] S6. In container five, the initiator was added to deionized water and stirred to obtain an initiator solution II;

[0013] S7. The initiator solution was removed from the container three and added to the container one, stirred at 75-80 ° C, and then the remaining core component was added to the container one within 25-35 minutes, the core component was added and stirred for 1 hour, and then the shell component was added to the container one, and the shell component was added within 55-65 minutes. After the initiator solution was removed from the container five, it was added to the container one, and stirred for 2-4 hours to obtain an emulsion;

[0014] S8. After cooling the emulsion in the container to 50° C., stirring is stopped. After discharging the emulsion, impurities are filtered out to obtain a quick-drying water-based acrylic resin emulsion.

[0015] Furthermore, in step S1 of the present invention, the weight ratio of the emulsifier to deionized water is (2-3):(50-60), and the emulsifier is sodium dodecylbenzene sulfonate.

[0016] Furthermore, in step S2 of the present invention, by weight, styrene is 60-80 parts, acrylic acid monomer is 4.75-9.47 parts, methyl methacrylate is 15-30 parts, isooctyl acrylate is 0.01-0.5 parts, tripropylene glycol diacrylate is 0.01-0.07 parts, and the acrylic acid monomer is one of methacrylic acid and acrylic acid.

[0017] Furthermore, in step S3 of the present invention, the weight ratio of the emulsifier to the core component is 1:(4-10).

[0018] Furthermore, in step S4 of the present invention, the weight ratio of the initiator to deionized water is (5-10):(90-95), and the initiator is one of potassium persulfate and ammonium persulfate.

[0019] Furthermore, in step S5 of the present invention, by weight, styrene is 10-30 parts, acrylic acid monomer is 5-10 parts, methyl methacrylate is 5-10 parts, and isooctyl acrylate is 60-70 parts, the acrylic acid monomer is one of methacrylic acid and acrylic acid, and the weight ratio of the core component to the shell component is (0.2-0.8):1.

[0020] Furthermore, in step S6 of the present invention, the weight ratio of the initiator to deionized water is (1-2):(98-99), and the initiator is one of potassium persulfate and ammonium persulfate.

[0021] Furthermore, in step S7 of the present invention, the weight ratio of the core component to the initiator solution 1 is (7-35):1, and the weight ratio of the shell component to the initiator solution 2 is (7-12):1.

[0022] Furthermore, in steps S1 to S8 of the present invention, the stirring speed is constant at 300-350 r / min.

[0023] Another technical problem to be solved by the present invention is to provide a quick-drying water-based acrylic resin emulsion for plastic ink prepared by the above preparation method.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1) The drying speed of the acrylic resin emulsion with a high hard monomer content is faster than that of the acrylic resin emulsion with a low hard monomer content. When designing the core-shell emulsion, the present invention controls the drying speed of the water-based acrylic resin emulsion for plastic ink by changing the content of the hard monomer in the core-shell component. At the same time, the addition of the cross-linking monomer will also increase the drying speed of the emulsion. The more the amount used, the faster the drying speed. Therefore, the present invention designs water-based acrylic resin emulsions with different core-shell ratios to make the drying speed of plastic ink controllable, and the process is relatively simple, the emulsion has good stability, and the prepared quick-drying water-based acrylic resin emulsion for plastic ink has good adhesion and printing performance.

[0026] 2) After the quick-drying plastic ink prepared by the present invention is mixed with the aqueous acrylic resin emulsion, the aqueous acrylic hard resin, the aqueous acrylic alkali-soluble resin and the aqueous color paste, the system is stable and dries quickly on low-surface-energy plastic substrates, especially has good adhesion on low-surface-energy plastics, and can effectively solve the problem of slow drying speed of aqueous plastic ink. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below in conjunction with specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0028] Example 1

[0029] Prepare the quick-drying water-based acrylic resin emulsion for plastic ink as follows:

[0030] S1. In a container 1, sodium dodecylbenzene sulfonate was dissolved in deionized water in a weight ratio of 2:50, heated to 78 ° C and stirred to obtain an emulsifier solution;

[0031] S2. In a container II, 75 parts of styrene, 4.98 parts of methacrylic acid, 20 parts of methyl methacrylate, 0.01 parts of isooctyl acrylate, 0.01 parts of tripropylene glycol diacrylate were weighed and stirred to obtain a core component;

[0032] S3. Remove 1 / 10 weight of the core component from container two and add it to container one, stir for 15 minutes, the weight ratio of the emulsifier to the core component is 1:7;

[0033] S4. In container three, potassium persulfate was added to deionized water in a weight ratio of 10:90 and stirred to obtain an initiator solution;

[0034] S5. In a container four, 20 parts of styrene, 8 parts of methacrylic acid, 10 parts of methyl methacrylate, 60 parts of isooctyl acrylate were weighed and stirred to obtain a shell component, the weight ratio of the core component to the shell component was 0.2: 1;

[0035] S6. In container five, potassium persulfate was added to deionized water in a weight ratio of 1:99 and stirred to obtain an initiator solution II;

[0036] S7. The initiator solution 1 was taken out from the container 3 and added to the container 1, the weight ratio of the core component to the initiator solution 1 was 7: 1, stirred at 78 ° C, and then the remaining core component was added to the container 1 within 25 minutes, the core component was added and stirred for 1 hour, and then the shell component was added to the container 1 within 55 minutes, and the shell component was added After the initiator solution 2 was taken out from the container 5 and added to the container 1, the weight ratio of the shell component to the initiator solution 2 was 7: 1, and the emulsion was obtained by stirring for 3 hours at a temperature of 1: 1;

[0037] S8. After cooling the emulsion in the container to 50° C., stop stirring, filter out impurities after discharging, and obtain a quick-drying water-based acrylic resin emulsion for plastic ink; in steps S1 to S8, the stirring speed is constant at 300 r / min.

[0038] Example 2

[0039] Prepare the quick-drying water-based acrylic resin emulsion for plastic ink as follows:

[0040] S1. In a container 1, sodium dodecylbenzene sulfonate was dissolved in deionized water in a weight ratio of 2:60, heated to 80 ° C and stirred to obtain an emulsifier solution;

[0041] S2. In a container II, 60 parts of styrene, 9.47 parts of methacrylic acid, 30 parts of methyl methacrylate, 0.5 parts of isooctyl acrylate, 0.03 parts of tripropylene glycol diacrylate were weighed and stirred to obtain a core component;

[0042] S3. Remove 1 / 10 weight of the core component from container two and add it to container one, stir for 12 minutes, the weight ratio of the emulsifier to the core component is 1:6;

[0043] S4. In container three, potassium persulfate was added to deionized water in a weight ratio of 10:90 and stirred to obtain an initiator solution;

[0044] S5. In a container four, 25 parts of styrene, 5 parts of methacrylic acid, 10 parts of methyl methacrylate, 60 parts of isooctyl acrylate were weighed and stirred to obtain a shell component, the weight ratio of the core component to the shell component was 0.4: 1;

[0045] S6. In container five, potassium persulfate was added to deionized water in a weight ratio of 2:98 and stirred to obtain an initiator solution II;

[0046] S7. The initiator solution 1 was taken out from the container 3 and added to the container 1, the weight ratio of the core component to the initiator solution 1 was 10: 1, stirred at 80 ° C for 25 minutes, and then the remaining core component was added to the container 1 within 30 minutes, the core component was added and stirred for 1 hour, and then the shell component was added to the container 1 within 60 minutes, and after the shell component was added, the initiator solution 2 was taken out from the container 5 and added to the container 1, the weight ratio of the shell component to the initiator solution 2 was 8: 1, and the mixture was stirred for 2 hours to obtain an emulsion;

[0047] S8. After cooling the emulsion in container 1 to 50° C., stop stirring, filter out impurities after discharging to obtain a quick-drying water-based acrylic resin emulsion for plastic ink; in steps S1 to S8, the stirring speed is constant at 320 r / min.

[0048] Example 3

[0049] Prepare the quick-drying water-based acrylic resin emulsion for plastic ink as follows:

[0050] S1. In a container 1, sodium dodecylbenzene sulfonate was dissolved in deionized water in a weight ratio of 3:60, heated to 80 ° C and stirred to obtain an emulsifier solution;

[0051] S2. In a container II, 80 parts of styrene, 4.75 parts of acrylic acid, 15 parts of methyl methacrylate, 0.2 parts of isooctyl acrylate, 0.05 parts of tripropylene glycol diacrylate were weighed and stirred to obtain a core component;

[0052] S3. Remove 1 / 10 weight of the core component from container two and add it to container one, stir for 18 minutes, the weight ratio of the emulsifier to the core component is 1:4;

[0053] S4. In container three, ammonium persulfate was added to deionized water in a weight ratio of 5:95 and stirred to obtain an initiator solution;

[0054] S5. In a container four, 30 parts of styrene, 5 parts of acrylic acid, 5 parts of methyl methacrylate, 60 parts of isooctyl acrylate were weighed and stirred to obtain a shell component, the weight ratio of the core component to the shell component was 0.6: 1;

[0055] S6. In container five, ammonium persulfate was added to deionized water in a weight ratio of 1:99 and stirred to obtain an initiator solution II;

[0056] S7. The initiator solution 1 was taken out from the container 3 and added to the container 1, the weight ratio of the core component to the initiator solution 1 was 15: 1, stirred at 80 ° C, and then the remaining core component was added to the container 1 within 35 minutes, the core component was added and stirred for 1 hour, and then the shell component was added to the container 1 within 65 minutes, and the shell component was added After the initiator solution 2 was taken out from the container 5 and added to the container 1, the weight ratio of the shell component to the initiator solution 2 was 9: 1, and the mixture was stirred for 4 hours to obtain an emulsion;

[0057] S8. After cooling the emulsion in the container to 50°C, stop stirring, filter out impurities after discharging to obtain a quick-drying water-based acrylic resin emulsion; in steps S1 to S8, the stirring speed is constant at 330 r / min.

[0058] Example 4

[0059] Prepare the quick-drying water-based acrylic resin emulsion for plastic ink as follows:

[0060] S1. In a container, sodium dodecylbenzene sulfonate was dissolved in deionized water in a weight ratio of 3:55, heated to 75 ° C and stirred to obtain an emulsifier solution;

[0061] S2. In a container II, 73 parts of styrene, 5.98 parts of acrylic acid, 21 parts of methyl methacrylate, 0.01 parts of isooctyl acrylate, 0.07 parts of tripropylene glycol diacrylate were weighed and stirred to obtain a core component;

[0062] S3. Remove 1 / 10 weight of the core component from container two and add it to container one and stir for 20 minutes. The weight ratio of the emulsifier to the core component is 1:10;

[0063] S4. In container three, ammonium persulfate was added to deionized water in a weight ratio of 5:95 and stirred to obtain an initiator solution;

[0064] S5. In a container four, 10 parts of styrene, 10 parts of acrylic acid, 10 parts of methyl methacrylate, 70 parts of isooctyl acrylate were weighed and stirred to obtain a shell component, the weight ratio of the core component to the shell component was 0.8: 1;

[0065] S6. In container five, ammonium persulfate was added to deionized water in a weight ratio of 2:98 and stirred to obtain an initiator solution II;

[0066] S7. The initiator solution 1 was taken out from the container 3 and added to the container 1, the weight ratio of the core component to the initiator solution 1 was 20: 1, stirred at 75 ° C, and then the remaining core component was added to the container 1 within 28 minutes, the core component was added and stirred for 1 hour, and then the shell component was added to the container 1 within 62 minutes, and the shell component was added After the initiator solution 2 was taken out from the container 5 and added to the container 1, the weight ratio of the shell component to the initiator solution 2 was 10: 1, and the mixture was stirred for 2.5 hours to obtain an emulsion;

[0067] S8. After cooling the emulsion in the container to 50°C, stop stirring, filter out impurities after discharging to obtain a quick-drying water-based acrylic resin emulsion; in steps S1 to S8, the stirring speed is constant at 340r / min.

[0068] Example 5

[0069] Prepare the quick-drying water-based acrylic resin emulsion for plastic ink as follows:

[0070] S1. In a container 1, sodium dodecylbenzene sulfonate was dissolved in deionized water in a weight ratio of 2:60, heated to 80 ° C and stirred to obtain an emulsifier solution;

[0071] S2. In a container II, 60 parts of styrene, 9.47 parts of methacrylic acid, 30 parts of methyl methacrylate, 0.5 parts of isooctyl acrylate, 0.05 parts of tripropylene glycol diacrylate were weighed and stirred to obtain a core component;

[0072] S3. Remove 1 / 10 weight of the core component from container two and add it to container one, stir for 10 minutes, the weight ratio of the emulsifier to the core component is 1:5;

[0073] S4. In container three, potassium persulfate was added to deionized water in a weight ratio of 8:92 and stirred to obtain an initiator solution;

[0074] S5. In a container four, 25 parts of styrene, 5 parts of methacrylic acid, 8 parts of methyl methacrylate, 65 parts of isooctyl acrylate were weighed and stirred to obtain a shell component, the weight ratio of the core component to the shell component was 0.4: 1;

[0075] S6. In container five, potassium persulfate was added to deionized water in a weight ratio of 2:98 and stirred to obtain an initiator solution II;

[0076] S7. The initiator solution was taken out from the container three and added to the container one, the weight ratio of the core component to the initiator solution was 35: 1, stirred at 80 ° C, and then the remaining core component was added to the container one within 32 minutes, the core component was added and stirred for 1 hour, and then the shell component was added to the container one within 58 minutes, and the shell component was added After the initiator solution was taken out from the container five, the initiator solution was added to the container one, the weight ratio of the shell component to the initiator solution was 11: 1, and the mixture was stirred for 3.5 hours to obtain an emulsion;

[0077] S8. After cooling the emulsion in the container to 50°C, stop stirring, filter out impurities after discharging to obtain a quick-drying water-based acrylic resin emulsion; in steps S1 to S8, the stirring speed is constant at 350r / min.

[0078] Comparative Example

[0079] The difference from Example 1 is that tripropylene glycol diacrylate is not included in the core component.

[0080] Experimental example

[0081] The water-based acrylic resin emulsions of plastic inks prepared in Examples 1-5 and the comparative example were mixed with water-based resin color pastes (the weight percentage of the water-based resin color pastes was: 1% of wetting agent BYK3760, 75% of BASF Joncryl 678 water-based acrylic solid resin, and 24% of carbon black powder) at a weight ratio of 92:8, and then coated on PET and PP plastic substrates. After curing, the drying speed was tested with reference to the initial drying test method of liquid ink GB / T 13217.5-2008, and the adhesion was tested with reference to GB / T 13217.7-2009. The test results are shown in Table 1:

[0082]

[0083] Table 1

[0084] It can be seen from Table 1 that:

[0085] 1) The plastic ink prepared by the present invention has a faster drying speed and better adhesion after being mixed with the water-based acrylic resin emulsion and the water-based resin color paste.

[0086] 2) The present invention can adjust the drying speed of the water-based acrylic resin in the plastic ink by changing the core-shell ratio, wherein the greater the content of the hard monomer of the core component and the greater the proportion of the core component, the faster the drying speed of the water-based plastic ink prepared from its emulsion.

[0087] 3) Compared with Example 1, the drying speed of the comparative example is significantly reduced, indicating that the cross-linking monomer tripropylene glycol diacrylate (TPGDA) used in the present invention can effectively improve the drying speed of the aqueous acrylic resin emulsion. Moreover, the more TPGDA is used, the faster the emulsion prepared therefrom dries, so the purpose of adjusting the drying speed of the aqueous plastic ink can be achieved by adjusting the amount of TPGDA used.

[0088] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for preparing a quick-drying water-based acrylic resin emulsion for plastic ink, characterized in that: The following steps are involved: S1. In a container 1, dissolve the emulsifier in deionized water, heat to 75-80°C and stir to obtain an emulsifier solution; S2. Weigh styrene, acrylic acid monomer, methyl methacrylate, isooctyl acrylate, tripropylene glycol diacrylate in container II and stir to obtain a core component; S3. Remove 1 / 10 weight of the core component from container two and add it to container one and stir for 10-20 minutes; S4. In container three, the initiator was added to deionized water and stirred to obtain an initiator solution; S5. Styrene, acrylic acid monomer, methyl methacrylate, isooctyl acrylate were weighed in container IV and stirred to obtain a shell component; S6. In container five, the initiator was added to deionized water and stirred to obtain an initiator solution II; S7. The initiator solution was removed from the container three and added to the container one, stirred at 75-80 ° C, and then the remaining core component was added to the container one within 25-35 minutes, the core component was added and stirred for 1 hour, and then the shell component was added to the container one within 55-65 minutes, and the shell component was added to the container five after the initiator solution was removed from the container two was added to the container one, and stirred for 2-4 hours to obtain an emulsion; S8. After cooling the emulsion in container 1 to 50° C., stirring is stopped. After discharging, impurities are filtered out to obtain a water-based acrylic resin emulsion for quick-drying plastic ink.

2. The method for preparing a quick-drying water-based acrylic resin emulsion for plastic ink according to claim 1, characterized in that: In the step S1, the weight ratio of the emulsifier to deionized water is (2-3):(50-60), and the emulsifier is sodium dodecylbenzene sulfonate.

3. The method for preparing a quick-drying water-based acrylic resin emulsion for plastic ink according to claim 1, characterized in that: In the step S2, by weight, styrene is 60-80 parts, acrylic acid monomer is 4.75-9.47 parts, methyl methacrylate is 15-30 parts, isooctyl acrylate is 0.01-0.5 parts, tripropylene glycol diacrylate is 0.01-0.07 parts, and the acrylic acid monomer is one of methacrylic acid and acrylic acid.

4. The method for preparing a quick-drying water-based acrylic resin emulsion for plastic ink according to claim 1, characterized in that: In the step S3, the weight ratio of the emulsifier to the core component is 1:(4-10).

5. The method for preparing a quick-drying water-based acrylic resin emulsion for plastic ink according to claim 1, characterized in that: In step S4, the weight ratio of the initiator to deionized water is (5-10):(90-95), and the initiator is one of potassium persulfate and ammonium persulfate.

6. The method for preparing a quick-drying water-based acrylic resin emulsion for plastic ink according to claim 1, characterized in that: In the step S5, by weight, styrene is 10-30 parts, acrylic acid monomer is 5-10 parts, methyl methacrylate is 5-10 parts, and isooctyl acrylate is 60-70 parts. The acrylic acid monomer is one of methacrylic acid and acrylic acid. The weight ratio of the core component to the shell component is (0.2-0.8):

1.

7. The method for preparing a quick-drying water-based acrylic resin emulsion for plastic ink according to claim 1, characterized in that: In step S6, the weight ratio of the initiator to deionized water is (1-2):(98-99), and the initiator is one of potassium persulfate and ammonium persulfate.

8. The method for preparing a quick-drying water-based acrylic resin emulsion for plastic ink according to claim 1, characterized in that: In step S7, the weight ratio of the core component to the initiator solution 1 is (7-35):1, and the weight ratio of the shell component to the initiator solution 2 is (7-12):

1.

9. The method for preparing a quick-drying water-based acrylic resin emulsion for plastic ink according to claim 1, characterized in that: In the steps S1 to S8, the stirring speed is kept constant at 300-350 r / min.

10. Aqueous acrylic resin emulsion for quick-drying plastic ink prepared by the preparation method according to claims 1 to 9.

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