CN115717014A - Preparation method of easily-crosslinked core-shell type polyhydroxyacrylate emulsion coating - Google Patents
Preparation method of easily-crosslinked core-shell type polyhydroxyacrylate emulsion coating Download PDFInfo
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- CN115717014A CN115717014A CN202211454316.9A CN202211454316A CN115717014A CN 115717014 A CN115717014 A CN 115717014A CN 202211454316 A CN202211454316 A CN 202211454316A CN 115717014 A CN115717014 A CN 115717014A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 16
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- 239000000178 monomer Substances 0.000 claims description 27
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- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 14
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- 239000000126 substance Substances 0.000 claims description 6
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Abstract
The invention relates to a preparation method of an easily crosslinked core-shell type polyhydroxyacrylate emulsion coating. According to the method, three groups of epoxy group, carboxyl group and hydroxyl group are introduced through glycidyl methacrylate, acrylic acid and hydroxypropyl methacrylate, by means of the advantages of a core-shell structure and the characteristics of the groups, the active interaction of the epoxy group and the hydroxyl group at the polymerization temperature is avoided, the hydrophobic epoxy group, the hydrophilic carboxyl group and the hydroxyl group are respectively retained in a core layer and a shell layer to the maximum extent through the core-shell structure, the maximum separation of crosslinking groups in the polymer is realized, and the storage stability of the coating is enhanced. The invention realizes the synchronous improvement of the performances of the paint in the aspects of adhesive force, hardness, storage stability and the like.
Description
The technical field is as follows:
the invention relates to the field of decorative coatings. In particular to a preparation method of a core-shell type polyhydroxyacrylate coating with hot-pressing rapid crosslinking.
The background art comprises the following steps:
the wood lacquer is a coating applied to the surface of wood furniture, and has important significance for the protection and decoration of the surface of the furniture. The paint has the advantages of oily property and water property, wherein the water-based paint is developed rapidly by virtue of low VOC (volatile organic compound) emission. The emulsion polymer is a main film-forming substance of the waterborne wood lacquer, and common film-forming resins include polyurethane resin, alkyd resin, epoxy resin, acrylic resin and the like. Acrylate monomers are various in types, double bonds are generally utilized for free radical polymerization in the synthesis process to prepare acrylate emulsion with small particle size distribution and strong stability, carboxyl, hydroxyl, epoxy and other active groups are introduced into the emulsion by virtue of functional monomers such as acrylic acid, hydroxypropyl methacrylate, glycidyl methacrylate and the like, more crosslinking sites are provided for the subsequent hot-pressing veneering process of wood furniture, and the comprehensive performance of the coating can be improved by carrying out reaction in a self-crosslinking or external crosslinking mode. The waterborne acrylate wood coating can realize the regulation and control of the emulsion performance by changing the type and the dosage of the monomer. The solvent resistance and the mechanical strength of the coating are superior to those of the waterborne polyurethane resin coating by adjusting the types of the monomers, the film-forming hardness superior to that of the alkyd resin coating can be obtained by increasing the proportion of hard monomer raw materials, and the coating is low in price and has stronger market competitiveness compared with the waterborne epoxy resin coating. In addition, the acrylate coating has the advantages of high glossiness, good stability, strong weather resistance and the like, on one hand, the acrylate coating synthesized by the emulsion polymerization method takes water as a solvent, so that the dosage of organic matters is greatly reduced, the acrylate coating is safer and more environment-friendly, the addition and the release of formaldehyde-free compounds are basically realized, on the other hand, the storage stability of the emulsion is improved, the storage time of the product is longer, and the waste of resources is reduced to a certain extent (China forestry science research institute, 2019-04-01). However, the prior polyacrylate coating still has the problems of low crosslinking degree, overlong crosslinking time, poor wear resistance of the coating and the like. Therefore, in order to overcome the limitations of these disadvantages in their applications, it is generally necessary to modify polyacrylates by introducing functional monomers, etc. The polyacrylate emulsion containing the hydroxyl functional monomer can form an external crosslinking system with amino resin, epoxy resin and the like, so that the crosslinking density of the film-forming material is improved, and the performance of the coating is improved; the polyacrylate emulsion containing a hydroxyl functional monomer may be further modified to form an intramolecular self-crosslinking system (Journal of Applied Polymer Science,2017,134 (21), 44844). The current common self-crosslinking methods include three methods, namely, a self-crosslinking system is formed by introducing an N-methacrylamide (NMA) monomer into a polymer, but formaldehyde is easily released in the crosslinking process, so that the self-crosslinking system poses a threat to human bodies. The substitution of N-ethylacrylamide for NMA can completely eliminate formaldehyde, but acetaldehyde is also formed, resulting in the formation of polymers with too low molecular weight to meet the mechanical strength requirements of the coatings in industry. And secondly, a crosslinking system based on acetoacetoxy groups, namely acetoacetoxy ethyl methacrylate (AAEM), is a commonly used functional group, but the system formed by the method can be self-crosslinked at room temperature, the storage stability of the coating is poor, and although the shelf life can be prolonged by adding a polymerization inhibitor, the phenomenon of serious delayed curing in the use process can be caused. Thirdly, the method is a self-crosslinking system based on reversible reaction of ketone-hydrazide, the reaction speed of the method is relatively slow, the mechanical property improvement effect is poor, and toxic hydrazine can cause harm to human bodies (ACS applied materials & interfaces,2016,8 (27), 17499-17510), and the method is difficult to adapt to industrial production requirements.
The woodware paint is an indispensable part in the furniture industry, not only can play a role in decorating and beautifying the protective board, but also can improve the physical and mechanical properties of the board and achieve the purposes of ageing resistance and prolonging the service life (Journal of Applied Polymer Science 2020,137 (31), 48931). The demand of the current market for green environment-friendly coatings is increasing day by day, and a formaldehyde-free environment-friendly coating with excellent mechanical property, high gloss and good adhesive force is urgently needed to be developed.
The invention content is as follows:
the invention discloses a hot-pressing fast-crosslinking wood furniture resin coating aiming at the problems of poor storage stability, poor crosslinking performance and the like of the current wood furniture coating. The method has the innovation points that epoxy groups, carboxyl groups and hydroxyl groups are introduced through glycidyl methacrylate, acrylic acid and hydroxypropyl methacrylate, the active interaction of the epoxy groups and the hydroxyl groups at the polymerization temperature is avoided by means of the advantages of the core-shell structure and the characteristics of the groups, the hydrophobic epoxy groups, the hydrophilic carboxyl groups and the hydroxyl groups are respectively retained in the core layer and the shell layer to the maximum extent through the core-shell structure, the maximum separation of crosslinking groups in the polymer is realized, and the storage stability of the coating is enhanced. The epoxy group only reacts with the carboxyl at the polymerization reaction temperature, and the residual epoxy group can react with the hydroxyl under the hot pressing condition, so that the secondary crosslinking of the polyhydroxyacrylate emulsion is realized, a double crosslinking system is formed, and the synchronous improvement of the performances of the paint in the aspects of adhesive force, hardness, storage stability and the like is realized.
The technical scheme of the invention is as follows:
a preparation method of an easily crosslinked core-shell type polyhydroxyacrylate emulsion coating comprises the following steps:
(1) Mixing the core layer monomer and the first emulsion, and stirring to obtain a core layer pre-emulsion;
mixing the shell monomer and the second emulsion, and stirring to obtain a shell pre-emulsion;
the stirring speed is 1500-2000 r/min; the stirring time is 20 to 30 minutes;
in the nuclear layer pre-emulsion, the mass ratio of a first emulsion: core layer monomer = (2 to 3): (5-6);
in the shell layer pre-emulsion, the mass ratio of the shell layer emulsion is as follows: shell monomer = (2 to 3): (5-6);
the core layer monomer is a mixture of two or three of methyl methacrylate, butyl acrylate and glycidyl methacrylate, and the mass ratio of the methyl methacrylate: butyl acrylate: glycidyl methacrylate = (50 to 20): (0 to 20): (1-10); when the amount of the substance is 0, the substance is not added;
the shell monomer is a mixture of methyl methacrylate, butyl acrylate, acrylic acid and hydroxypropyl methacrylate, and the mass ratio of the methyl methacrylate: butyl acrylate: acrylic acid: hydroxypropyl methacrylate = (30 to 20): (30-20): (1-3): (1-8);
(2) Adding sodium bicarbonate and a third emulsion into a reactor, dropwise adding a core layer pre-emulsion with a volume of 25-35% and an ammonium persulfate solution with a volume of 25-35% into the reactor respectively for 15-20 min under the atmosphere of nitrogen, electromagnetic stirring and at the temperature of 75-80 ℃, keeping the reaction temperature at 75-80 ℃, and preserving heat for 0.5-1 h to form a seed emulsion;
adding 0.5-1 g of sodium bicarbonate into every 30g of the third emulsion;
the emulsifying agents in the first emulsion, the second emulsion and the third emulsion are the same and are sodium dodecyl sulfate and OP-10, and the mass ratio of the sodium dodecyl sulfate: OP-10=2:1; the mass concentrations of the first emulsion, the second emulsion and the third emulsion are the same or different and are 3-6 percent;
the mass ratio of the core-layer pre-emulsion to the shell-layer pre-emulsion is 1;
the mass ratio of the nuclear layer pre-emulsion to the ammonium persulfate solution is (7-9): (1-1.5); the mass concentration of the ammonium persulfate solution is 0.10-0.18%;
the mass ratio of the first emulsion to the second emulsion to the third emulsion is (1);
(3) Then heating to 80-85 ℃, dropwise adding the nuclear layer pre-emulsion and 25-35% ammonium persulfate solution into the seed emulsion for 1.5-1.75 h, and preserving heat for 0.5-1 h to finish the preparation of the nuclear layer; then dropwise adding the shell layer pre-emulsion and the residual ammonium persulfate solution at the temperature of between 80 and 85 ℃ within 2 to 2.25 hours, carrying out heat preservation reaction for 0.5 to 1 hour, then cooling to room temperature, and adjusting the pH value of the emulsion to between 8 and 9 to obtain stable core-shell type polyhydroxyacrylate emulsion which is milky white;
the core-shell type polyhydroxyacrylate emulsion prepared by the method is applied to the surface coating of wood furniture.
The method specifically comprises the following steps: directly coating the prepared core-shell type polyhydroxyacrylate emulsion on the front surface of decorative paper, quickly drying in an oven at 120 ℃ for about 30-60 s, taking out, placing to room temperature, coating the core-shell type polyhydroxyacrylate emulsion on the surface of an artificial board, attaching the back surface of the decorative paper to the artificial board, and hot-pressing for 3-8 min under the conditions of 1.5-2.0 MPa and 120-160 ℃.
The invention has the substantive characteristics that:
aiming at the technical problem of the decorative paper surface coating, the invention modifies the traditional polyacrylate emulsion, introduces three functional groups of hydroxyl, carboxyl and epoxy into the system by means of hydroxypropyl methacrylate, acrylic acid and glycidyl methacrylate functional monomers according to the polymerization reaction of acrylate monomers, and obtains the coating with stable performance by preparing the polyhydroxyacrylate emulsion with a core-shell structure. The coating is brushed on the surface of decorative paper, and the decorative paper surface coating with excellent comprehensive performance can be obtained through a hot pressing technology, and the adhesive force is remarkably improved compared with that of a monodisperse polyacrylate coating.
The invention has the beneficial effects that:
the invention has the beneficial effects that the obtained core-shell type polyhydroxyacrylate emulsion has good storage stability and rapid crosslinking capability. In the preparation process, the epoxy group in the glycidyl methacrylate has an important influence on the crosslinking effect in the hot pressing process. The prepared emulsion was characterized for different properties, and the following results were obtained. Firstly, regarding solid content, 48 percent (w) of the solid content of the core-shell structured polyhydroxyacrylate emulsion is obviously higher than 40 percent (w) of the monodisperse polyacrylate emulsion, so that the drying time of a coating film is shortened; secondly, in the aspect of adhesive force performance, the adhesive force of the core-shell type polyhydroxyacrylate emulsion after coating is obviously improved compared with that of a monodisperse polyacrylate coating, and the adhesive force of a paint film reaches the 0-grade standard according to GB/T9286-1998; in addition, the water resistance and the alcohol resistance of the emulsion coating prepared by the method meet the requirements of no foaming and no whitening after 48 hours, the storage stability reaches half a year, and the requirements of the national standard on the coating on the surface of the decorative paper are met. Therefore, the core-shell type polyhydroxyacrylate emulsion is used as a coating, can play a good role in protecting the surface of decorative paper, and has important significance for decoration of wood furniture.
Drawings
FIG. 1 is a graph showing adhesion test after coating of a commercial polyhydroxyacrylate emulsion;
FIG. 2 is a graph showing the adhesion force of the core-shell type polyhydroxyacrylate emulsion obtained in example 3 after coating;
FIG. 3 is a comparison graph of IR spectra of the core-shell type polyhydroxyacrylate emulsion obtained in example 3 before and after hot pressing.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The coating mainly has the effects of improving the surface gloss, adhesive force and wear resistance of the wood furniture, increasing the attractiveness of the furniture and prolonging the service life of the furniture, adopts a brushing and hot-pressing combined mode to carry out veneering decoration, requires a plurality of crosslinking reaction groups in the polyhydroxyacrylate emulsion, and utilizes thermal crosslinking to improve the performance of the coating.
The core-shell type polyhydroxyacrylate emulsion can form a protective film with strong adhesive force on the surface of decorative paper in a short time through brushing and hot pressing. Functional groups which are easy to react are separated through a core-shell structure, the storage time of the emulsion is prolonged, the addition of the glycidyl methacrylate provides a basis for forming a more compact three-dimensional network structure coating film in a hot pressing process, and simultaneously, due to the characteristics of substances, the glossiness of the surface of the decorative paper after the coating film is improved.
The reaction process of the invention is shown as the formula: forming a seed emulsion by a core layer pre-emulsion formed by methyl methacrylate, butyl acrylate and glycidyl methacrylate at 75 ℃, then heating to 80 ℃, and completing the preparation of a core layer within 2 hours, wherein the core layer reaction is shown as (1). Keeping the temperature at 80 ℃, adding a shell layer pre-emulsion formed by methyl methacrylate, butyl acrylate, methacrylic acid and hydroxypropyl methacrylate into a reaction device within 2.5h to finish shell layer preparation, wherein the shell layer reaction is as shown in (2), cooling to room temperature after the reaction is finished, and adjusting the pH value by ammonia water to obtain the stable core-shell type polyhydroxyacrylate emulsion.
The following example is a method for preparing a polyhydroxyacrylate emulsion which is rapidly cross-linked at high temperature.
Example 1
The preparation method and the application of the easy-crosslinking core-shell type polyhydroxyacrylate emulsion are characterized by comprising the following steps:
90g of deionized water, 3g of an emulsifier (OP-10 SDS = 1).
Preparation of core layer pre-emulsion: 50g of methyl methacrylate and 1g of glycidyl methacrylate as core layer monomers were added to a beaker containing 31g of the emulsion obtained above and stirred at a speed of 2000r/min for pre-emulsification for 15min to form a core layer pre-emulsion.
Preparing a shell layer pre-emulsion: stirring 31g of the emulsion obtained above, 24g of methyl methacrylate, 26g of butyl acrylate, 1g of acrylic acid and 1.5g of hydroxypropyl methacrylate in a beaker, wherein the stirring speed is 2000r/min, and pre-emulsifying for 15min to form a shell layer pre-emulsion;
(1) 31g of the emulsion (i.e., the remaining 1/3 of the emulsion) and 0.5g of sodium bicarbonate were added to a four-necked flask and stirred for 5min. When the temperature rises to 75 ℃, 1/3 of ammonium persulfate solution (solution consisting of 0.25g of ammonium persulfate and 15g of deionized water) and 1/3 of nuclear layer pre-emulsion are simultaneously dripped by using a constant pressure dropping funnel for 15min. After the dropwise addition, the temperature is adjusted to 80 ℃, and the temperature is kept for 30min to form seed emulsion.
(2) And (3) dropwise adding the residual nuclear layer pre-emulsion into the seed emulsion for 1.5h, and synchronously dropwise adding 1/3 of ammonium persulfate solution for 1.75h. After the dropwise addition, stirring and heat preservation are carried out for 0.5h at the temperature of 85 ℃, and the nuclear layer stage polymerization is completed.
(3) And (3) dropwise adding the shell layer pre-emulsion into the reaction container for 2h, and synchronously dropwise adding the residual ammonium persulfate solution for 1.75h. After the dropwise addition, the temperature was adjusted to 90 ℃, stirred and kept for 0.5h. Cooling the product to room temperature, adjusting the pH value to 8-9, filtering and discharging to obtain the core-shell type polyhydroxyacrylate emulsion.
Example 2
The other steps are the same as the example 1, except that the types and the dosage of the monomers of the core layer are regulated, and the dosage of the glycidyl methacrylate of the core layer is changed from 1g to 5g; the amount of methyl methacrylate is changed from 50g to 35g; changing the weight of butyl acrylate from 0g to 10g;
example 3
The other steps are the same as the example 1, except that the types and the dosage of the monomers of the core layer are regulated, the dosage of the glycidyl methacrylate of the core layer is changed from 1g to 10g, and the dosage of the methyl methacrylate is changed from 50g to 20g; changing the weight of butyl acrylate from 0g to 20g;
comparative example 1
The adhesion force performance test of a commercial polyacrylate coating comprises the following steps
Firstly, an artificial board with the specification of 10cm x 10cm is taken as a base material, a commercial polyacrylate coating (Jinan Xin Sensui chemical Co., ltd., model No. 22687) is coated on the surface of decorative paper, then commercial polyhydroxyacrylate emulsion is coated on the surface of the artificial board for veneering and hot pressing, and a QFH-HG600 type adhesion tester is used for testing, wherein the testing conditions are as follows: the blade is 2mm and 11 teeth. The tip of the blade is vertically contacted with the surface of the coating and forms 45 degrees with the wood grain of the decorative paper, the cutter is pulled at a constant speed for at least 30mm, a downward force is always kept, the plate is rotated for 90 degrees, the operation is repeated in the above cutting area, the surface of the coating is cut into small squares with fixed area and penetrates to the base material, a soft brush is used for lightly sweeping along the diagonal line of the grids for several times, evaluation is carried out by taking GB/T9286-1998 grid test of paint and varnish films as a standard, and the parallel test is carried out for three times, as shown in figure 1, the cutting edge part of the coating is observed to fall off by large fragments, the affected cross cutting area accounts for 20 percent of the total area of the grids and is between 15 and 35 percent, therefore, the adhesion rating is 3.
Comparative example 2
The adhesive force performance test of the easy-crosslinking core-shell type polyhydroxyacrylate emulsion comprises the following steps
Taking an artificial board with the specification of 10cm-10cm as a base material, coating a small amount of the core-shell type polyhydroxyacrylate emulsion obtained in the example 3 on the surface of decorative paper, drying, coating the core-shell type polyhydroxyacrylate emulsion on the surface of the artificial board, performing veneering hot pressing, and testing by using a QFH-HG600 type adhesion tester under the testing conditions: the blade is 2mm and 11 teeth. As shown in FIG. 2, the cut edges of the coating were observed to be smooth and no peeling, and the adhesion rating was rated 0 according to GB/T9286-1998 "Cross cut test on paint and clear coat films", which meets the national standards and is superior to the performance of the polyacrylate coating commercialized in comparative example 1.
Comparative example 3
A hardness property test of a commercial polyacrylate coating comprises the following steps
Taking an artificial board with the specification of 10cm x 10cm as a base material, coating a commercial polyacrylate coating (Jinsensen, inc., jinan) on the surface of the decorative paper, drying, coating a polyhydroxy acrylate coating on the surface of the artificial board, and performing veneering and hot pressing to complete the preparation of the sample. A paint film hardness test is carried out by using a 101 type Chinese hardness test pencil according to the national standard GB/T6739-2006, the test pencils with different hardness are sharpened and then treated by sand, the pencil slides on a sample plate at a constant speed of 1mm/s at an angle of 45 degrees for 1cm, the test is carried out from hard to soft, and the observed maximum pencil hardness without scratches is the hardness of the paint film of the tested sample plate. The hardness of the coating film of the commercial modified polyacrylate emulsion is H.
Comparative example 4
The hardness performance test of the easily crosslinked core-shell type polyhydroxyacrylate emulsion comprises the following steps
An artificial board with the specification of 10cm-10cm is taken as a base material, the core-shell type polyhydroxyacrylate emulsion in the embodiment 1 is coated on the surface of decorative paper and dried, then the core-shell type polyhydroxyacrylate emulsion is coated on the surface of the artificial board, and veneering hot pressing is carried out (a test hot press (the model is CREE-6014E-1) is carried out, the hot press is 1.5-2.0 MPa, the temperature is 130 ℃, and the hot pressing is carried out for 5 min), so that the preparation of a sample is completed. The coating hardness was measured by pencil hardness measurement and found to be 2H. The coating film formed from the emulsion is excellent in hardness property.
According to the above examples and comparative examples, it can be seen that according to the evaluation of GB/T9286-1998 "cross-cut experiment of colored paint and varnish paint film" standard, the adhesion performance of the examples is higher than that of the comparative examples, three functional groups of hydroxyl, carboxyl and epoxy introduced in the examples form a double cross-linking system, the epoxy group reacts with the carboxyl in the polymerization process to ensure the basic adhesion of the polyhydroxyacrylate emulsion prepared in the examples, and the secondary cross-linking of the hydroxyl and epoxy in the polyhydroxyacrylate emulsion is realized by hot-pressing operation after the preparation is completed, as shown in FIG. 3, the hydroxyl peak and epoxy peak in the polyhydroxyacrylate emulsion paint disappear before and after hot-pressing, and the adhesion performance of the paint is enhanced; glycidyl methacrylate is introduced in the embodiment, the glycidyl methacrylate is classified into acrylate hard monomers, the effect of improving the hardness of the coating is achieved, and the coating hardness of the embodiment is evaluated to be superior to that of the first-grade coating according to the national standard GB/T6739-2006.
The above description is only a few preferred embodiments of the present invention, but the present invention is not limited to the above-mentioned embodiments. The foregoing detailed description is to be considered as illustrative and not restrictive, and changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.
The invention is not the best known technology.
Claims (4)
1. A preparation method of an easily-crosslinked core-shell type polyhydroxyacrylate emulsion coating is characterized by comprising the following steps:
(1) Mixing the core layer monomer and the first emulsion, and stirring to obtain a core layer pre-emulsion;
mixing the shell monomer and the second emulsion, and stirring to obtain a shell pre-emulsion;
in the nuclear layer pre-emulsion, the mass ratio of a first emulsion: core layer monomer = (2 to 3): (5-6);
in the shell layer pre-emulsion, the mass ratio of the shell layer emulsion is as follows: shell layer monomer = (2 to 3): (5-6);
the core layer monomer is a mixture of two or three of methyl methacrylate, butyl acrylate and glycidyl methacrylate, and the mass ratio of the methyl methacrylate: butyl acrylate: glycidyl methacrylate = (50 to 20): (0 to 20): (1-10); when the amount of the substance is 0, the substance is not added;
the shell monomer is a mixture of methyl methacrylate, butyl acrylate, acrylic acid and hydroxypropyl methacrylate, and the mass ratio of the methyl methacrylate to the butyl acrylate to the hydroxypropyl methacrylate is as follows: butyl acrylate: acrylic acid: hydroxypropyl methacrylate = (30 to 20): (30-20): (1-3): (1-8);
(2) Adding sodium bicarbonate and a third emulsion into a reactor, dropwise adding a core layer pre-emulsion with a volume of 25-35% and an ammonium persulfate solution with a volume of 25-35% into the reactor respectively for 15-20 min under the atmosphere of nitrogen, electromagnetic stirring and at the temperature of 75-80 ℃, keeping the reaction temperature at 75-80 ℃, and preserving heat for 0.5-1 h to form a seed emulsion;
adding 0.5-1 g of sodium bicarbonate into every 25-35 g of the third emulsion;
the emulsifying agents in the first emulsion, the second emulsion and the third emulsion are the same and are sodium dodecyl sulfate and OP-10, and the mass ratio of the sodium dodecyl sulfate: OP-10=2:1; the mass concentrations of the first emulsion, the second emulsion and the third emulsion are the same or different and are 3-6 percent;
the mass ratio of the core-layer pre-emulsion to the shell-layer pre-emulsion is 1;
the mass ratio of the nuclear layer pre-emulsion to the ammonium persulfate solution is (7-9): (1-1.5); the mass concentration of the ammonium persulfate solution is 0.10-0.18%;
the mass ratio of the first emulsion to the second emulsion to the third emulsion is 1;
(3) Then heating to 80-85 ℃, dropwise adding the nuclear layer pre-emulsion and 25-35% ammonium persulfate solution into the seed emulsion for 1.5-1.75 h, and preserving heat for 0.5-1 h to finish the preparation of the nuclear layer; then dripping the shell layer pre-emulsion and the residual ammonium persulfate solution at the temperature of between 80 and 85 ℃ within 2 to 2.25 hours, carrying out heat preservation reaction for 0.5 to 1 hour, then cooling to room temperature, and adjusting the pH value of the emulsion to between 8 and 9 to obtain the easily crosslinked core-shell type polyhydroxyacrylate emulsion coating.
2. The method for preparing the easy-crosslinking core-shell type polyhydroxyacrylate emulsion coating according to claim 1, wherein the stirring speed in the step (1) is 1500-2000 r/min; the stirring time is 20-30 min.
3. The use of the easy-crosslinking core-shell polyhydroxyacrylate emulsion coating prepared by the method of claim 1, which is characterized by being applied to the surface coating of wood furniture.
4. Use according to claim 3, characterized in that it comprises in particular the following steps: the prepared core-shell type polyhydroxyacrylate emulsion is directly coated on the front surface of decorative paper, then quickly dried in an oven at 120 ℃ for about 30-60 s, taken out and placed to room temperature, the core-shell type polyhydroxyacrylate emulsion is coated on the surface of an artificial board, the back surface of the decorative paper is attached to the artificial board, and the artificial board is hot-pressed for 3-8 min under the conditions of 1.5-2.0 MPa and 120-160 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH0314856A (en) * | 1989-03-31 | 1991-01-23 | Takeda Chem Ind Ltd | Core-shell polymer |
| CN1800225A (en) * | 2005-12-28 | 2006-07-12 | 中国化工建设总公司常州涂料化工研究院 | Latex type hydroxy acryl acid resin possessing core-shell configuration |
| CN102807648A (en) * | 2012-09-05 | 2012-12-05 | 陕西科技大学 | Method for preparing high-elasticity adhesive for fabric by adopting nuclear shell emulsion polymerization method |
| CN105777980A (en) * | 2016-05-16 | 2016-07-20 | 北京化工大学 | Epoxy/carboxyl-containing acrylate copolymer core-shell emulsion and preparation method and application thereof |
| CN107163180A (en) * | 2017-06-15 | 2017-09-15 | 陕西科技大学 | A kind of preparation method of anti-corrosion type core-shell polyacrylate emulsion |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0314856A (en) * | 1989-03-31 | 1991-01-23 | Takeda Chem Ind Ltd | Core-shell polymer |
| CN1800225A (en) * | 2005-12-28 | 2006-07-12 | 中国化工建设总公司常州涂料化工研究院 | Latex type hydroxy acryl acid resin possessing core-shell configuration |
| CN102807648A (en) * | 2012-09-05 | 2012-12-05 | 陕西科技大学 | Method for preparing high-elasticity adhesive for fabric by adopting nuclear shell emulsion polymerization method |
| CN105777980A (en) * | 2016-05-16 | 2016-07-20 | 北京化工大学 | Epoxy/carboxyl-containing acrylate copolymer core-shell emulsion and preparation method and application thereof |
| CN107163180A (en) * | 2017-06-15 | 2017-09-15 | 陕西科技大学 | A kind of preparation method of anti-corrosion type core-shell polyacrylate emulsion |
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