Yellowing-resistant and after-tack-resistant acrylic art paint emulsion and preparation method thereof

Abstract

The invention discloses an anti-yellowing anti-after-tack acrylic art paint emulsion and a preparation method thereof, and belongs to the technical field of acrylic emulsions.The anti-yellowing anti-after-tack acrylic art paint emulsion comprises deionized water, an acrylate monomer, methacrylate, an acrylic monomer, a crosslinking monomer and an emulsifier. The acrylic ester monomer with low Tg participates in the formation of the core part of the acrylic art paint emulsion, so that the obtained emulsion core layer part is soft but not sticky, and the film forming temperature of the acrylic art paint emulsion and the art paint is low. Methacrylate with high Tg participates in formation of a shell layer part of the emulsion, so that the shell layer is high in rigidity and hardness and can wrap a core layer part, the thickness and strength of a paint film can be improved after the emulsion forms a film, and a good anti-adhesion effect is achieved on the paint film; therefore, the after-tack problem occurring in the stacking process of the art paint sample plate and the art paint prefabricated plate can be solved, and the art paint emulsion and the art paint can meet the requirement for after-tack resistance of stacking of the art paint sample plate and the art paint prefabricated plate under the high-temperature condition.

Description

Technical Field

[0001] The invention relates to the technical field of acrylic emulsions, in particular to a yellowing-resistant and anti-re-adhesive acrylic art paint emulsion and a preparation method thereof. Background Art

[0002] The origin of artistic paint can be traced back to Europe. Its surface can form unique three-dimensional patterns and designs, which can fully express three-dimensional beauty. At present, most artistic paints are made of environmentally friendly water-based synthetic emulsions, but such emulsions often have yellowing resistance due to improper use of materials, which cannot make artistic paints show better anti-light stability.

[0003] In addition, the anti-adhesive properties of existing water-based synthetic emulsions cannot meet the requirements of stacking artistic paint samples or prefabricated panels. Adhesion between panels is likely to occur, causing scratches, damage or deformation on the panel surface, thereby affecting the decorative effect of the artistic paint.

[0004] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0005] The purpose of the present invention is to provide a yellowing-resistant and anti-adhesive acrylic art paint emulsion and a preparation method, aiming to solve the problem that the existing water-based synthetic emulsion is not resistant to yellowing and has anti-adhesive properties and cannot meet the requirements of stacking art paint samples or prefabricated panels.

[0006] To achieve the above object, the solution provided by the present invention is:

[0007] The invention provides a yellowing-resistant and anti-re-adhesive acrylic art paint emulsion, which comprises the following components in parts by weight: 53-83 parts of deionized water, 27-32 parts of acrylate monomers, 5-10 parts of methacrylate, 1-3 parts of acrylic monomers, 1.5-2 parts of cross-linking monomers, 0.5-1 parts of emulsifiers, 0.1-1 parts of pH regulators, 0.05-1 parts of buffers, 0.4 parts of oxidation initiators, 0.4 parts of reduction initiators, 0.01-0.02 parts of residual monomer treatment oxidants, and 0.01-0.02 parts of residual monomer treatment reducing agents;

[0008] The acrylate monomer, acrylic acid monomer and cross-linking monomer participate in forming the core part of the emulsion, and the methacrylate, acrylic acid monomer and cross-linking monomer participate in forming the shell part of the emulsion.

[0009] Optionally, the acrylate monomer includes at least one of butyl acrylate, ethyl acrylate, methyl acrylate, hexyl acrylate, and 2-ethylhexyl acrylate.

[0010] Optionally, the methacrylate includes at least one of methyl methacrylate, butyl methacrylate, pentyl methacrylate, and isooctyl methacrylate.

[0011] Optionally, the acrylic acid monomer includes at least one of acrylic acid, methacrylic acid, and itaconic acid.

[0012] Optionally, the crosslinking monomer includes at least one of vinyl trimethoxy silane, vinyl triethoxy silane, glycidyl methacrylate, acrylic acid phosphate monomer, methacrylamide ethyl ethylene urea, and 1,6-hexanediol diacrylate.

[0013] Optionally, the emulsifier includes anionic emulsifier and nonionic emulsifier.

[0014] Optionally, the anionic emulsifier includes at least one of allyl aliphatic polyoxyethylene sulfate sodium salt, alkylbenzene sulfonate sodium salt, alkyl sulfate sodium salt, alkylnaphthalene sulfonate sodium salt, and alkylnaphthalene sulfonic acid sodium salt.

[0015] Optionally, the nonionic emulsifier includes at least one of alkyl polyoxyethylene ether, fluorine-containing polyoxyethylene ether, and isomeric alcohol polyoxyethylene ether.

[0016] Optionally, the oxidation initiator includes hydrogen peroxide, and the reduction initiator includes sodium hypophosphite.

[0017] The present invention also provides a method for preparing the yellowing-resistant and anti-re-adhesive acrylic art paint emulsion, comprising the following steps:

[0018] S001. Deionized water, an emulsifier and a buffer are added to the reactor to obtain a base liquid, and the temperature in the reactor is raised to 70 to 80 ° C;

[0019] S002. Deionized water and an emulsifier are added to a stirring container at room temperature and pressure. After preferentially being evenly dispersed, an acrylate monomer, an acrylic acid monomer, and a cross-linking monomer are added to a mixture of deionized water and an emulsifier, and dispersed evenly to obtain a core layer emulsion;

[0020] S003. The acrylic acid monomer, methacrylate, and cross-linking monomer are uniformly mixed to obtain a shell monomer mixture;

[0021] S004. The oxidation initiator and deionized water were mixed to obtain oxidation initiator solution A, oxidation initiator solution B and oxidation initiator solution C; the reduction initiator and deionized water were mixed to obtain reduction initiator solution A, reduction initiator solution B and reduction initiator solution C;

[0022] S005. The residual single treatment oxidant and deionized water are mixed to obtain a residual single treatment oxidant solution; the residual single treatment reducing agent and deionized water are mixed to obtain a residual single treatment reducing agent solution;

[0023] S006. The pH regulator and deionized water are mixed to obtain a pH regulator solution;

[0024] S007. Add oxidation initiator solution A and reduction initiator solution B to the reactor, then add 5% to 30% of the total weight of the core layer emulsion to the reactor, start timing the reaction time when the temperature in the reactor rises to 70°C, after reacting for 15 to 30 minutes, simultaneously add the remaining core layer emulsion, oxidation initiator solution B, and reduction initiator solution B to the reactor, the dropping time is 150 to 210 minutes, and ensure that the remaining core layer emulsion is added earlier than the oxidation initiator solution B and the reduction initiator solution B, and perform heat preservation after the addition is completed:

[0025] S008. After the insulation of step S007 is completed, the temperature in the reactor is lowered to 60-65°C, and then the shell monomer mixture is added. After uniform dispersion, the oxidation initiator solution C and the reduction initiator solution C are added to the reactor, and the reaction is carried out for 20-30 minutes, and when the temperature in the reactor is heated to 70-80°C again, insulation is carried out;

[0026] S009. After the insulation of step S008 is completed, the temperature in the reactor is lowered to 60-70°C, and the residual monomer treatment oxidant solution and the residual monomer treatment reducing agent solution are added dropwise to treat the residual monomer;

[0027] S010. After the residual monomer treatment is completed, the temperature in the reactor is lowered to 40-50° C., the pH value of the material in the reactor is adjusted to 7-9 with a pH adjuster solution, and then filtered to obtain a yellowing-resistant and anti-re-adhesive acrylic art paint emulsion.

[0028] The beneficial effects of the present invention are:

[0029] The present invention provides an acrylic art paint emulsion that is resistant to yellowing and anti-re-adhesion. The acrylic art paint emulsion is resistant to yellowing by avoiding the use of materials that are unstable to thermal yellowing and ultraviolet yellowing, so that the acrylic art paint emulsion and the art paint have good light resistance stability both indoors and outdoors. By using a cross-linking monomer and an acrylic monomer, the cross-linking density of the emulsion polymer can be increased, so that the anti-adhesion and heat and temperature resistance (aging resistance) properties of the acrylic art paint emulsion and the art paint are improved.

[0030] In addition, by using acrylate monomers with low glass transition temperature to participate in the formation of the core part of the acrylic art paint emulsion, the core layer of the obtained emulsion can be made soft and non-sticky, and the film-forming temperature of the acrylic art paint emulsion and the art paint is low. By using methacrylate with high glass transition temperature to participate in the formation of the shell layer of the emulsion, the shell layer has strong rigidity and high hardness, and can wrap the core layer part. After the acrylic art paint emulsion is formed into a film, the thickness and strength of the paint film can be increased, and the paint film has a good anti-adhesion effect, thereby solving the back-adhesion problem of the art paint sample and the art paint prefabricated board during the stacking process, and enabling the art paint emulsion and the art paint to meet the requirements of anti-back-adhesion when the art paint sample and the art paint prefabricated board are stacked under high temperature conditions.

[0031] The present invention also provides a method for preparing a yellowing-resistant and anti-rebound acrylic art paint emulsion. By selecting a suitable core layer emulsion material and dripping the core layer emulsion as well as an oxidation initiator and a reduction initiator in two steps, the core layer structure can be more effectively adjusted, so that the core layer structure has a high crosslinking density and a large molecular weight and can form a network interpenetration with the shell layer, thereby achieving a high crosslinking and anti-rebound effect.

[0032] The shell part uses the method of oxidation initiator and reduction initiator explosion to make the hard monomer evenly distributed around the soft core, wrap the soft core, and form a cross-linking effect with the soft core, thereby forming a good anti-sticking layer, which can avoid the disappearance of artistic effects and stains caused by sticking during the stacking process of artistic paint samples and prefabricated panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The invention discloses a flow chart of a method for preparing a yellowing-resistant and anti-re-adhesive acrylic art paint emulsion. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The invention provides a yellowing-resistant and anti-re-adhesive acrylic art paint emulsion, which comprises the following components in parts by weight: 53-83 parts of deionized water, 27-32 parts of acrylate monomers, 5-10 parts of methacrylate, 1-3 parts of acrylic monomers, 1.5-2 parts of cross-linking monomers, 0.5-1 parts of emulsifiers, 0.1-1 parts of pH regulators, 0.05-1 parts of buffers, 0.4 parts of oxidation initiators, 0.4 parts of reduction initiators, 0.01-0.02 parts of residual monomer-treated oxidants, and 0.01-0.02 parts of residual monomer-treated reducing agents.

[0036] In the above composition, the acrylate monomer belongs to the soft monomer of acrylate, which may include at least one of butyl acrylate, ethyl acrylate, methyl acrylate, hexyl acrylate, and 2-ethylhexyl acrylate. The molecular structure of the above acrylate monomer contains a long carbon chain, and these long carbon chains have good flexibility. Methacrylate is a kind of hard monomer, which may include at least one of methyl methacrylate, butyl methacrylate, amyl methacrylate, and isooctyl methacrylate. The above hard monomer can form a polymer segment with strong rigidity after polymerization, and these segments can increase the hardness of the emulsion after film formation.

[0037] The acrylic monomer contains carboxyl groups in its molecules. During the film-forming process of the emulsion, the carboxyl groups can react chemically with active groups such as hydroxyl groups and amino groups on the surface of the plate to form chemical bonds, thereby improving the adhesion of the artistic paint film. The cross-linking monomer plays the role of internal cross-linking, which can be interconnected with methacrylic acid and acrylate groups to form a three-dimensional network structure, thereby making the cross-linking degree of different chain segments higher, and improving the anti-adhesion and heat resistance (aging resistance) properties of the emulsion and the artistic paint containing the emulsion.

[0038] In the above composition, the acrylate monomer, acrylic acid monomer and cross-linking monomer participate in forming the core part of the emulsion. Among them, the acrylate monomer has a low glass transition temperature (tg). When it is matched with the acrylic acid monomer and the cross-linking monomer, it can make the core layer of the emulsion soft and non-sticky. The emulsion and the artistic paint containing the emulsion can form a film at a relatively low temperature.

[0039] In the above composition, the methacrylate, acrylic monomer and cross-linking monomer participate in forming the shell layer of the emulsion, wherein the methacrylate has a high glass transition temperature, so that the shell layer has strong rigidity and high hardness, and can wrap the core layer. After the emulsion is formed into a film, the thickness and strength of the paint film can be increased, and the paint film has a good anti-adhesion effect, thereby solving the back-adhesion problem of the art paint sample and the art paint prefabricated board during the stacking process, and enabling the art paint emulsion and art paint to meet the requirements of anti-back-adhesion when the art paint sample and the art paint prefabricated board are stacked under high temperature conditions.

[0040] Optionally, the acrylic monomer includes at least one of acrylic acid, methacrylic acid, and itaconic acid. The above acrylic monomers all have carboxyl groups, which can impart hydrogen bonds to the emulsion. In the process of the cross-linking monomer participating in the reaction, the cross-linking monomer can participate in hydrogen bond cross-linking or internal cross-linking with the acrylic monomer to form a three-dimensional interpenetrating network structure, which can improve the anti-adhesion, high temperature resistance and heat resistance of the emulsion and the art paint containing the emulsion.

[0041] Optionally, the cross-linking monomer includes at least one of vinyl trimethoxysilane, vinyl triethoxysilane, glycidyl methacrylate, acrylic acid phosphate monomer, methyl acrylamide ethyl ethylene urea, and 1,6-hexanediol diacrylate. Among them, acrylic acid phosphate monomer can form a three-dimensional network structure with methacrylic acid, thereby improving the anti-adhesion properties of emulsions and artistic paints; and 1,6-hexanediol diacrylate has the characteristics of a bifunctional group, so that different polymer chains can form a three-dimensional network structure through acrylate groups during free radical polymerization, so that the cross-linking degree of different chain segments is higher, thereby improving the anti-aging properties of emulsions and artistic paints.

[0042] Optionally, the emulsifier includes anionic emulsifier and nonionic emulsifier, wherein the anionic emulsifier can adjust the particle size of the emulsion particles, so that the acrylic art paint emulsion has better use stability and storage stability, and the anionic emulsifier can adjust the double layer density of the emulsification system, thereby improving the emulsification stability of the emulsion; and the nonionic emulsifier is used to adjust the hydration layer of the emulsification system, which can reduce the probability of unstable slag discharge of the product, thereby improving the tolerance of the emulsion formula system.

[0043] Optionally, the anionic emulsifier includes at least one of allyl aliphatic polyoxyethylene sulfate sodium salt, alkylbenzene sulfonate sodium salt, alkyl sulfate sodium salt, alkylnaphthalene sulfonate sodium salt, and alkylnaphthalene sulfonic acid sodium salt.

[0044] Optionally, the nonionic emulsifier includes at least one of alkyl polyoxyethylene ether, fluorine-containing polyoxyethylene ether, and isomeric alcohol polyoxyethylene ether.

[0045] Optionally, the oxidation initiator includes hydrogen peroxide, and the reduction initiator includes sodium hypophosphite.

[0046] The invention also provides a method for preparing the yellowing-resistant and anti-re-adhesive acrylic art paint emulsion, which comprises the following steps.

[0047] S001. Add 30-40 parts of deionized water, 0.3 parts of emulsifier and 0.05-1 parts of buffer into the reactor to obtain a base liquid, and at the same time raise the temperature in the reactor to 70-80°C.

[0048] In this step, the emulsifier includes anionic emulsifier and nonionic emulsifier, and the mass ratio of the anionic emulsifier to the nonionic emulsifier is (1-10): 1, which is conducive to the stability of the emulsion. The buffer is used to stabilize the pH value of the material in the reactor at the initial stage of emulsion preparation, so that the monomer has high reaction activity when participating in the reaction, which is conducive to improving the yield of acrylic art paint emulsion.

[0049] S002. Add 5 to 10 parts of deionized water and 0.2 to 0.7 parts of anionic emulsifier into a stirring container at room temperature and pressure. After preferentially dispersing them evenly, add 27 to 32 parts of acrylate monomer, 0.5 to 2 parts of acrylic acid monomer and 1 part of cross-linking monomer into the mixture of deionized water and emulsifier. After dispersing them evenly, obtain a core layer emulsion, and stir for 30 minutes for use.

[0050] S003. 0.5 to 1 parts of acrylic acid monomer, 5 to 10 parts of methacrylate, and 0.5 to 1 parts of cross-linking monomer are uniformly mixed to obtain a shell monomer mixture.

[0051] S004. Mix 0.1 parts of oxidation initiator and 1 to 2 parts of deionized water to obtain oxidation initiator solution A, mix 0.1 parts of oxidation initiator and 3 to 5 parts of deionized water to obtain oxidation initiator solution B, mix 0.2 parts of oxidation initiator and 3 to 5 parts of deionized water to obtain oxidation initiator solution C; mix 0.1 parts of reduction initiator and 1 to 2 parts of deionized water to obtain reduction initiator solution A, mix 0.2 parts of reduction initiator and 3 to 5 parts of deionized water to obtain reduction initiator solution B, mix 0.1 parts of reduction initiator and 3 to 5 parts of deionized water to obtain reduction initiator solution C.

[0052] S005. Evenly mix 0.01-0.02 parts of the residual single treatment oxidant and 1-3 parts of deionized water to obtain a residual single treatment oxidant solution; evenly mix 0.01-0.02 parts of the residual single treatment reductant and 1-3 parts of deionized water to obtain a residual single treatment reductant solution. In this step, the residual single treatment oxidant is tert-butyl hydroperoxide, and the residual single treatment reductant is sodium pyrosulfite.

[0053] S006. Evenly mix 0.1 to 1 parts of a pH regulator and 1 to 3 parts of deionized water to obtain a pH regulator solution.

[0054] S007. When the temperature in the reactor reaches 70-80°C, add oxidation initiator solution A and reduction initiator solution B into the reactor, and then add 5% to 30% of the total weight of the core layer emulsion into the reactor. When the temperature in the reactor rises back to 70°C, start timing the reaction time. After reacting for 15 to 30 minutes, simultaneously add the remaining core layer emulsion, oxidation initiator solution B and reduction initiator solution B dropwise into the reactor. The adding time is 150 to 210 minutes, and ensure that the remaining core layer emulsion is added 5 to 10 minutes earlier than the oxidation initiator solution B and the reduction initiator solution B. After the addition is completed, perform insulation treatment and maintain insulation for 30 minutes.

[0055] In this step, the polymerization of monomers is initiated simultaneously by the oxidation initiator and the reduction initiator, which not only has a fast initiation speed and can be achieved at a lower temperature, but also can increase the crosslinking density of the polymer, thereby increasing the molecular weight of the emulsion particles. The core layer emulsion is added dropwise in two steps, which can control the particle size of the emulsion particles (which is beneficial to improving the emulsion tolerance, such as water resistance) and increase the molecular weight of the emulsion particles.

[0056] While adding the remaining core layer emulsion, continuing to add the oxidation initiator and the reduction initiator can ensure that all the core layer emulsion is fully initiated, and can more effectively adjust the core layer structure so that the emulsion core layer characteristics meet the design requirements.

[0057] S008. After the insulation of step S007 is completed, the temperature in the reactor is lowered to 60-65°C, and then the shell monomer mixture is added. After uniform dispersion, the oxidation initiator solution C and the reduction initiator solution C are added to the reactor and reacted for 20-30 minutes. When the temperature in the reactor is heated to 70-80°C again, it is kept warm for 30 minutes.

[0058] In this step, the hard monomer is evenly distributed around the soft core and wraps the soft core through the method of explosion polymerization of oxidation initiator and reduction initiator, and the hard monomer and the soft core form a cross-linking effect, giving full play to the interpenetrating characteristics of the network, thereby forming a multifunctional art paint finishing emulsion with internal cross-linking and good water resistance, yellowing resistance, anti-rebound and stain resistance.

[0059] S009. After the insulation of step S008 is completed, the temperature in the reactor is lowered to 60-70°C, and the residual monomer treatment oxidant solution and the residual monomer treatment reducing agent solution are added dropwise to treat the residual monomer;

[0060] S010. After the residual monomer treatment is completed, the temperature in the reactor is lowered to 40-50° C., the pH value of the material in the reactor is adjusted to 7-9 with a pH adjuster solution, and then filtered to obtain a yellowing-resistant and anti-re-adhesive acrylic art paint emulsion.

[0061] In order to further illustrate the yellowing-resistant and anti-re-sticking acrylic art paint emulsion and the preparation method provided by the present invention, the following examples and comparative examples are provided.

[0062] Example 1

[0063] The present embodiment provides a yellowing-resistant and anti-re-adhesive acrylic art paint emulsion, comprising the following components in parts by weight: 55 parts of deionized water, 29 parts of acrylate monomer, 10 parts of methacrylate, 3 parts of acrylic acid monomer, 1.5 parts of cross-linking monomer, 0.8 parts of emulsifier, 0.3 parts of pH adjuster, 0.1 parts of buffer, 0.4 parts of oxidation initiator, 0.4 parts of reduction initiator, 0.01 parts of residual single treatment oxidant, and 0.01 parts of residual single treatment reducing agent.

[0064] The acrylate monomer is composed of 10 parts of ethyl acrylate and 19 parts of butyl acrylate. The methacrylate is methyl methacrylate. The acrylic acid monomer is composed of 1 part of acrylic acid and 2 parts of methacrylic acid. The crosslinking monomer is vinyl trimethoxy silane. The emulsifier is composed of alkyl benzene sulfonic acid sodium salt and alkyl polyoxyethylene ether. The pH regulator is sodium carbonate, and the buffer is sodium bicarbonate.

[0065] This embodiment also provides a method for preparing a yellowing-resistant and anti-re-sticking acrylic art paint emulsion, comprising the following steps:

[0066] S001. Add 33 parts of deionized water, 0.3 parts of emulsifier and 0.1 parts of buffer to the reactor to obtain a base liquid, and raise the temperature in the reactor to 70 to 80°C; in this step, the emulsifier is composed of sodium alkylbenzene sulfonate and alkyl polyoxyethylene ether, and the mass ratio of sodium alkylbenzene sulfonate to alkyl polyoxyethylene ether is 2:1;

[0067] S002. Add 5 parts of deionized water and 0.5 parts of sodium alkylbenzene sulfonate to a stirring container at room temperature and pressure, and after preferentially dispersing evenly, add 10 parts of ethyl acrylate, 19 parts of butyl acrylate, 2 parts of methacrylic acid, and 1 part of vinyl trimethoxysilane to a mixture of deionized water and sodium alkylbenzene sulfonate, disperse evenly to obtain a core layer emulsion, and stir for 30 minutes for standby;

[0068] S003. 1 part of acrylic acid, 10 parts of methyl methacrylate and 0.5 parts of vinyl trimethoxysilane were mixed to obtain a shell monomer mixture;

[0069] S004. 0.1 parts of the oxidation initiator and 1 part of deionized water were mixed to obtain an oxidation initiator solution A, 0.1 parts of the oxidation initiator and 3 parts of deionized water were mixed to obtain an oxidation initiator solution B, 0.2 parts of the oxidation initiator and 3 parts of deionized water were mixed to obtain an oxidation initiator solution C; 0.1 parts of the reduction initiator and 1 part of deionized water were mixed to obtain a reduction initiator solution A, 0.2 parts of the reduction initiator and 3 parts of deionized water were mixed to obtain a reduction initiator solution B, and 0.1 parts of the reduction initiator and 3 parts of deionized water were mixed to obtain a reduction initiator solution C;

[0070] S005. 0.01 parts of the residual single treatment oxidant and 1 part of deionized water were mixed to obtain a residual single treatment oxidant solution; 0.01 parts of the residual single treatment reducing agent and 1 part of deionized water were mixed to obtain a residual single treatment reducing agent solution;

[0071] S006. Mix 0.3 parts of a pH adjuster and 1 part of deionized water to obtain a pH adjuster solution;

[0072] S007. When the temperature in the reactor reaches 70-80°C, add oxidation initiator solution A and reduction initiator solution B to the reactor, then add 5%-30% of the total weight of the core layer emulsion to the reactor, and when the temperature in the reactor rises back to 70°C, start timing the reaction time. After reacting for 15-30 minutes, simultaneously add the remaining core layer emulsion, oxidation initiator solution B, and reduction initiator solution B to the reactor dropwise for 150-210 minutes, and ensure that the remaining core layer emulsion is added 5-10 minutes earlier than the oxidation initiator solution B and the reduction initiator solution B. After the addition is completed, perform heat preservation treatment and maintain the heat preservation for 30 minutes:

[0073] S008. After the insulation of step S007 is completed, the temperature in the reactor is lowered to 60-65°C, and then the shell monomer mixture is added. After uniform dispersion, the oxidation initiator solution C and the reduction initiator solution C are added to the reactor, and the reaction is carried out for 20-30 minutes, and when the temperature in the reactor is heated to 70-80°C again, the temperature is kept for 30 minutes;

[0074] S009. After the insulation of step S008 is completed, the temperature in the reactor is lowered to 60-70°C, and the residual monomer treatment oxidant solution and the residual monomer treatment reducing agent solution are added dropwise to treat the residual monomer;

[0075] S010. After the residual monomer treatment is completed, the temperature in the reactor is lowered to 40-50° C., the pH value of the material in the reactor is adjusted to 7-9 with a pH adjuster solution, and then filtered to obtain a yellowing-resistant and anti-re-adhesive acrylic art paint emulsion.

[0076] Example 2

[0077] This embodiment provides a yellowing-resistant and anti-re-sticking acrylic art paint emulsion, which is different from Embodiment 1 in that the cross-linking monomer is replaced by an acrylic acid phosphate monomer instead of vinyl trimethoxysilane.

[0078] Example 3

[0079] This embodiment provides a yellowing-resistant and anti-re-sticking acrylic art paint emulsion, which is different from Embodiment 1 in that the cross-linking monomer is replaced by 1,6-hexanediol diacrylate instead of vinyltrimethoxysilane.

[0080] Comparative Example 1

[0081] The present comparative example provides an acrylic art paint emulsion, comprising the following components in parts by weight: 55 parts of deionized water, 29 parts of methacrylate, 3 parts of acrylic acid monomer, 10 parts of acrylate monomer, 1.5 parts of cross-linking monomer, 0.8 parts of emulsifier, 0.3 parts of pH adjuster, 0.1 parts of buffer, 0.4 parts of oxidation initiator, 0.4 parts of reduction initiator, 0.01 parts of residual monoamine treated oxidant, and 0.01 parts of residual monoamine treated reducing agent.

[0082] Wherein, the methacrylate is methyl methacrylate. The acrylic acid monomer is composed of 1 part of acrylic acid and 2 parts of methacrylic acid. The acrylate monomer is ethyl acrylate. The crosslinking monomer is vinyl trimethoxy silane. The emulsifier is composed of alkyl benzene sulfonic acid sodium salt and alkyl polyoxyethylene ether. The pH regulator is sodium carbonate, and the buffer is sodium bicarbonate.

[0083] This comparative example also provides a method for preparing an acrylic art paint emulsion, comprising the following steps S001 to S010, wherein step S001 and step S004 to S010 are the same as step S001 and step S004 to S010 in the preparation method provided in the embodiment.

[0084] Step S002 is: adding 5 parts of deionized water and 0.5 parts of sodium salt of alkylbenzene sulfonate into a stirring container at room temperature and pressure, and after preferentially dispersing them uniformly, adding 29 parts of methyl methacrylate, 2 parts of methacrylic acid, and 1 part of vinyl trimethoxy silane into a mixture of deionized water and sodium salt of alkylbenzene sulfonate, dispersing them uniformly to obtain a core layer emulsion, and stirring for 30 minutes for standby use;

[0085] Step S003 is: uniformly mix 1 part of acrylic acid, 10 parts of ethyl acrylate, and 0.5 parts of vinyltrimethoxysilane to obtain a shell monomer mixture.

[0086] Comparative Example 2

[0087] This comparative example provides an acrylic art paint emulsion, comprising the following components in parts by weight: 55 parts of deionized water, 39 parts of acrylate monomers, 3 parts of acrylic acid monomers, 1.5 parts of cross-linking monomers, 0.8 parts of emulsifiers, 0.3 parts of pH adjusters, 0.1 parts of buffers, 0.4 parts of oxidation initiators, 0.4 parts of reduction initiators, 0.01 parts of residual monoamine-treated oxidants, and 0.01 parts of residual monoamine-treated reducing agents.

[0088] The acrylic acid monomer is composed of 2 parts of methacrylic acid and 1 part of acrylic acid. The acrylate monomer is composed of ethyl acrylate and butyl acrylate. The crosslinking monomer is vinyl trimethoxy silane. The emulsifier is composed of alkyl benzene sulfonic acid sodium salt and alkyl polyoxyethylene ether. The pH regulator is sodium carbonate, and the buffer is sodium bicarbonate.

[0089] This comparative example also provides a method for preparing an acrylic art paint emulsion, comprising the following steps S001 to S010, wherein step S001 and step S004 to S010 are the same as step S001 and step S004 to S010 in the preparation method provided in the embodiment.

[0090] Step S002 is: adding 5 parts of deionized water and 0.5 parts of sodium salt of alkylbenzene sulfonate into a stirring container at room temperature and pressure, and after preferentially dispersing them uniformly, adding 10 parts of ethyl acrylate, 19 parts of butyl acrylate, 2 parts of methacrylic acid, and 1 part of vinyl trimethoxy silane into the mixed solution of deionized water and sodium salt of alkylbenzene sulfonate, dispersing them uniformly to obtain a core layer emulsion, and stirring for 30 minutes for standby use;

[0091] Step S003 is: uniformly mix 1 part of acrylic acid, 10 parts of ethyl acrylate, and 0.5 parts of vinyltrimethoxysilane to obtain a shell monomer mixture.

[0092] Comparative Example 3

[0093] This comparative example provides an acrylic art paint emulsion, which is different from Example 1 in that the pH regulator is replaced by ammonia water instead of sodium hydroxide.

[0094] Art paints were prepared according to the following formula using the yellowing-resistant and anti-re-sticking acrylic art paint emulsions provided in Examples 1 to 3 and the acrylic art paint emulsions provided in Comparative Examples 1 to 3.

[0095] The above-mentioned artistic paint includes 390 parts of water, 10 parts of alcohol ester twelve-type film-forming aids, and 600 parts of emulsion.

[0096] The yellowing resistance, water resistance and anti-rebound properties of the artistic paints configured above were tested respectively, and the test results are shown in Tables 1 and 2 below.

[0097] Table 1

[0100] It can be seen from the test results in Table 1 and Table 2 that the art paints prepared using the acrylic art paint emulsions provided in Comparative Examples 1 and 2 have a sticking problem. This is because the acrylic art paint emulsions provided in Comparative Examples 1 and 2 are hard core soft shell and soft core soft shell structures, and the paint film is too soft after the emulsion is formed into a film.

[0101] The artistic paint prepared using the acrylic artistic paint emulsion provided in Comparative Example 3 has poor yellowing resistance, water resistance, and anti-re-adhesion properties. This is because the introduction of ammonia water into the emulsion will aggravate the yellowing phenomenon and reduce the stability of the emulsion particles.

[0102] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A yellowing-resistant and anti-rebound acrylic art paint emulsion, characterized in that: The invention comprises the following components in parts by weight: 53-83 parts of deionized water, 27-32 parts of acrylate monomers, 5-10 parts of methacrylate, 1-3 parts of acrylic acid monomers, 1.5-2 parts of cross-linking monomers, 0.5-1 parts of emulsifiers, 0.1-1 parts of pH regulators, 0.05-1 parts of buffers, 0.4 parts of oxidation initiators, 0.4 parts of reduction initiators, 0.01-0.02 parts of residual single treatment oxidants, and 0.01-0.02 parts of residual single treatment reducing agents; The acrylate monomer, acrylic acid monomer and cross-linking monomer participate in forming the core part of the emulsion, and the methacrylate, acrylic acid monomer and cross-linking monomer participate in forming the shell part of the emulsion.

2. The yellowing-resistant and anti-rebound acrylic art paint emulsion according to claim 1, characterized in that: The acrylic acid ester monomer includes at least one of butyl acrylate, ethyl acrylate, methyl acrylate, hexyl acrylate, and 2-ethylhexyl acrylate.

3. The yellowing-resistant and anti-re-adhesive acrylic art paint emulsion according to claim 1, characterized in that: The methacrylate includes at least one of methyl methacrylate, butyl methacrylate, pentyl methacrylate, and isooctyl methacrylate.

4. The yellowing-resistant and anti-re-adhesive acrylic art paint emulsion according to claim 1, characterized in that: The acrylic acid monomer includes at least one of acrylic acid, methacrylic acid and itaconic acid.

5. The yellowing-resistant and anti-re-adhesive acrylic art paint emulsion according to claim 1, characterized in that: The crosslinking monomer includes at least one of vinyl trimethoxysilane, vinyl triethoxysilane, glycidyl methacrylate, acrylic acid phosphate monomer, methacrylamide ethyl ethylene urea, and 1,6-hexanediol diacrylate.

6. The yellowing-resistant and anti-rebound acrylic art paint emulsion according to claim 1, characterized in that: The emulsifier includes anionic emulsifier and nonionic emulsifier.

7. The yellowing-resistant and anti-re-adhesive acrylic art paint emulsion according to claim 6, characterized in that: The anionic emulsifier includes at least one of allyl aliphatic polyoxyethylene sulfate sodium salt, alkylbenzene sulfonate sodium salt, alkyl sulfate sodium salt, alkylnaphthalene sulfonate sodium salt, and alkylnaphthalene sulfonic acid sodium salt.

8. The yellowing-resistant and anti-re-adhesive acrylic art paint emulsion according to claim 6, characterized in that: The nonionic emulsifier includes at least one of alkyl polyoxyethylene ether, fluorine-containing polyoxyethylene ether and isomeric alcohol polyoxyethylene ether.

9. The yellowing-resistant and anti-rebound acrylic art paint emulsion according to claim 1, characterized in that: The oxidation initiator includes hydrogen peroxide, and the reduction initiator includes sodium hypophosphite.

10. A method for preparing the yellowing-resistant and anti-re-sticking acrylic art paint emulsion according to any one of claims 1 to 9, characterized in that: The following steps are involved: S001. Deionized water, an emulsifier and a buffer are added to the reactor to obtain a base liquid, and the temperature in the reactor is raised to 70 to 80 ° C; S002. Deionized water and an emulsifier are added to a stirring container at room temperature and pressure. After preferentially being evenly dispersed, an acrylate monomer, an acrylic acid monomer, and a cross-linking monomer are added to a mixture of deionized water and an emulsifier, and dispersed evenly to obtain a core layer emulsion; S003. The acrylic acid monomer, methacrylate, and cross-linking monomer are uniformly mixed to obtain a shell monomer mixture; S004. The oxidation initiator and deionized water were mixed to obtain oxidation initiator solution A, oxidation initiator solution B and oxidation initiator solution C; the reduction initiator and deionized water were mixed to obtain reduction initiator solution A, reduction initiator solution B and reduction initiator solution C; S005. The residual single treatment oxidant and deionized water are mixed to obtain a residual single treatment oxidant solution; the residual single treatment reducing agent and deionized water are mixed to obtain a residual single treatment reducing agent solution; S006. The pH regulator and deionized water are mixed to obtain a pH regulator solution; S007. Add oxidation initiator solution A and reduction initiator solution B to the reactor, then add 5% to 30% of the total weight of the core layer emulsion to the reactor, start timing the reaction time when the temperature in the reactor rises to 70°C, after reacting for 15 to 30 minutes, simultaneously add the remaining core layer emulsion, oxidation initiator solution B, and reduction initiator solution B to the reactor, the dropping time is 150 to 210 minutes, and ensure that the remaining core layer emulsion is added earlier than the oxidation initiator solution B and the reduction initiator solution B, and perform heat preservation after the addition is completed: S008. After the insulation of step S007 is completed, the temperature in the reactor is lowered to 60-65°C, and then the shell monomer mixture is added. After uniform dispersion, the oxidation initiator solution C and the reduction initiator solution C are added to the reactor, and the reaction is carried out for 20-30 minutes, and when the temperature in the reactor is heated to 70-80°C again, insulation is carried out; S009. After the insulation of step S008 is completed, the temperature in the reactor is lowered to 60-70°C, and the residual monomer treatment oxidant solution and the residual monomer treatment reducing agent solution are added dropwise to treat the residual monomer; S010. After the residual monomer treatment is completed, the temperature in the reactor is lowered to 40-50° C., the pH value of the material in the reactor is adjusted to 7-9 with a pH adjuster solution, and then filtered to obtain a yellowing-resistant and anti-re-adhesive acrylic art paint emulsion.

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