Self-thickening pure acrylic latex for art pigment and preparation method of self-thickening pure acrylic latex

Abstract

The invention relates to the technical field of art pigment preparation, and discloses a self-thickening pure acrylic latex for art pigment and a preparation method thereof, the self-thickening pure acrylic latex is composed of a base material, pigment, a cross-linking agent, a regulator, an initiator, an emulsifier and water; the base material is prepared from acrylic resin, alkyd resin, vinyl resin and water-based emulsion resin; the cross-linking agent is formed by mixing N-(2-hydroxyethyl) acrylamide, polymethyl methacrylate, polyvinyl alcohol and C12-14 alkyl glycidyl ether, and the conditioning agent is formed by mixing alpha-methylstyrene dimer and isooctyl thioglycolate. The initiator is prepared from dibenzoyl peroxide, dicumyl peroxide and azodicarbonamide. The emulsifier is composed of alkylbenzene sulfonate, lauryl sodium sulfate and alkyl sodium sulfonate. The adhesive has the characteristics of strong adhesive force, excellent tensile strength, strong stacking force, high yield force, high pseudoplasticity, aging resistance, high light resistance and the like. The formaldehyde is not contained, so that the worry of formaldehyde residue of a user on pure acrylic latex is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of art pigment preparation, in particular to a self-thickening pure acrylic latex for art pigment and a preparation method thereof. Background Art

[0002] The emulsions used in domestically manufactured painting pigments are all made up of special emulsions for interior or exterior wall paints in the construction industry. The requirements for interior or exterior wall paints are excellent scrub resistance, powder resistance, water and alkali resistance, wear resistance, flatness and smoothness. However, art painting pigments are required to have good stacking adhesion, tensile strength, stacking force, yield strength, plasticity, aging resistance and light resistance, which are achieved by the emulsion as a pigment binder. However, existing art pigments do not have these characteristics, and there is no green and environmentally friendly self-thickening pure acrylic latex for art pigments on the market. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to provide a self-thickening pure acrylic latex for art pigments and a preparation method thereof.

[0004] In order to achieve the above purpose, the present invention adopts the following technical scheme: self-thickening pure acrylic latex for art pigment and its preparation method, which consists of base material, pigment, cross-linking agent, regulator, initiator, emulsifier and water.

[0005] The base material is composed of a mixture of two or more of 15 to 30 parts of acrylic resin, 20 to 35 parts of alkyd resin, 10 to 25 parts of vinyl resin and 10 to 30 parts of water-based emulsion resin;

[0006] The crosslinking agent is a mixture of two or more of 5 to 10 parts of N-(2-hydroxyethyl) acrylamide, 1 to 6 parts of polymethyl methacrylate, 15 to 20 parts of polyvinyl alcohol and 5 to 15 parts of C12-14 alkyl glycidyl ether.

[0007] The regulator is prepared by mixing 5 to 10 parts of alpha-methylstyrene dimer and 2 to 10 parts of isooctyl thioglycolate.

[0008] The initiator is composed of one or more of 5 to 8 parts of dibenzoyl peroxide, 3 to 10 parts of dicumyl peroxide and 2 to 10 parts of azodicarbonamide.

[0009] The emulsifier is composed of one or more of 2 to 10 parts of alkylbenzene sulfonate, 5 to 10 parts of sodium dodecyl sulfate, and 3 to 8 parts of sodium alkyl sulfonate.

[0010] The method for preparing self-thickening pure acrylic latex for art pigments comprises at least the following steps:

[0011] S1: selecting two or more (in free combination) of acrylic resin, alkyd resin, vinyl resin and water-based emulsion resin and mixing them evenly to obtain a base material;

[0012] S2: selecting two or more (in free combination) of N-(2-hydroxyethyl) acrylamide, polymethyl methacrylate, polyvinyl alcohol and C12-14 alkyl glycidyl ether and mixing them uniformly to obtain a crosslinking agent;

[0013] S3: select α-methylstyrene dimer and isooctyl thioglycolate and mix them evenly to obtain a regulator;

[0014] S4 selects one or more of dibenzoyl peroxide, dicumyl peroxide and azodicarbonamide (mixing them evenly when multiple types are used) to obtain an initiator;

[0015] S5: selecting one or more of alkylbenzene sulfonate, sodium dodecyl sulfate and sodium alkyl sulfonate (mixing them uniformly when there are multiple types) to obtain an emulsifier;

[0016] S6: Pour the pigment and water into the reaction kettle and stir at a speed of 800-900 r / min, control the temperature at 55-65° C., add the base material obtained in S1, the crosslinking agent obtained in S2, the regulator obtained in S3, the emulsifier obtained in S5 and the initiator obtained in S4 into the reaction kettle in a dropwise manner, and stir for 1 hour;

[0017] S7: reducing the stirring speed to 300-400 / min, heating the temperature to 70-80°C, and reacting the mixture for 30 min;

[0018] S8 pours the remaining base material obtained from S1, the cross-linking agent obtained from S2, the regulator obtained from S3, the emulsifier obtained from S5 and the initiator obtained from S4 into the reactor, adds them into the reactor in a drop-by-drop manner, then increases the stirring speed, maintains the temperature at 70-80°C, reacts for 2 hours, and evacuates the reactor to a vacuum degree of -1 MKPa for 1 hour, then cools it to room temperature to obtain pure acrylic latex.

[0019] The water used is purified water, distilled water or reverse osmosis water.

[0020] The present invention has the following beneficial effects:

[0021] The base material copolymerization is initiated by an initiator to obtain the so-called seed emulsion, that is, in the initial stage of emulsion polymerization, emulsion polymerization is carried out in the presence of a relatively sufficient emulsifier to generate a latex liquid with a sufficient amount and a small enough particle size. The final latex particle size distribution obtained by seed emulsion polymerization is narrow, which is conducive to improving the rheological properties of the emulsion, and the particle structure can be designed to obtain a latex with excellent thixotropy that is more suitable for art pigments.

[0022] The green and environmentally friendly emulsifier is used in a nearly micro-emulsification mode to make the prepared emulsion almost free of coagulation, and under the premise of high solid content, it can still obtain a nearly translucent and thin appearance.

[0023] Combined with the graded and variable speed stirring process, the finished latex product has better adhesion, tensile strength, stacking force, yield strength, pseudoplasticity, durability, aging resistance, light resistance and other properties, and is particularly suitable for pure acrylic latex used as art pigments; moderate vacuum stripping operation enables the finished latex to get rid of the bad odor inherent in conventional pure acrylic latex products and emit a pleasant aroma.

[0024] Through the scientific proportion of cross-linking agents and the use of cross-linking agents without hydroxymethyl groups, the latex obtained by this process does not contain formaldehyde, which completely reverses the users' concerns about the possible formaldehyde residue in pure acrylic latex. DETAILED DESCRIPTION

[0025] The following will be combined with 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.

[0026] Example 1

[0027] S1: 15 parts of acrylic resin, 20 parts of alkyd resin, 10 parts of vinyl resin and 10 parts of water-based emulsion resin are selected and mixed evenly to obtain a base material;

[0028] S2: 5 parts of N-(2-hydroxyethyl)acrylamide, 1 part of polymethyl methacrylate, 15 parts of polyvinyl alcohol and 5 parts of C12-14 alkyl glycidyl ether are mixed evenly to obtain a crosslinking agent;

[0029] S3: 5 parts of α-methylstyrene dimer and 2 parts of isooctyl thioglycolate are mixed evenly to obtain a regulator;

[0030] S4: selecting one or more of 5 parts of dibenzoyl peroxide, 3 parts of dicumyl peroxide and 2 parts of azodicarbonamide (mixing them evenly when using more than one) to obtain an initiator;

[0031] S5: select one or more of 2 parts of alkylbenzene sulfonate, 5 parts of sodium lauryl sulfate, and 3 parts of sodium alkyl sulfonate (mix them evenly if there are multiple parts) to obtain an emulsifier;

[0032] S6: Pour the pigment and water into the reactor and stir at a speed of 800 r / min, control the temperature at 55°C, add 60% of the total amount of the base material obtained in S1, 40% of the total amount of the crosslinking agent obtained in S2, 50% of the total amount of the regulator obtained in S3, 45% of the total amount of the emulsifier obtained in S5, and 60% of the total amount of the initiator obtained in S4 into the reactor in a dropwise manner, and stir for 1 hour;

[0033] S7: reduce the stirring speed to 300 / min, heat the temperature to 70°C, and react for 30 min;

[0034] S8 pours the remaining base material obtained from S1, the cross-linking agent obtained from S2, the regulator obtained from S3, the emulsifier obtained from S5 and the initiator obtained from S4 into the reactor, adds them into the reactor in a drop-by-drop manner, and then increases the stirring speed from 300r / min to 800r / min, maintains the temperature at 70°C, reacts for 2h, and evacuates the reactor to a vacuum degree of -1MKPa for 1h, then cools it to room temperature to obtain pure acrylic latex.

[0035] Example 2

[0036] S1: 23 parts of acrylic resin, 27 parts of alkyd resin, 18 parts of vinyl resin and 20 parts of water-based emulsion resin are selected and mixed evenly to obtain a base material;

[0037] S2: 7 parts of N-(2-hydroxyethyl)acrylamide, 4 parts of polymethyl methacrylate, 17 parts of polyvinyl alcohol and 10 parts of C12-14 alkyl glycidyl ether are mixed evenly to obtain a crosslinking agent;

[0038] S3: 7 parts of α-methylstyrene dimer and 6 parts of isooctyl thioglycolate are mixed evenly to obtain a regulator;

[0039] S4: selecting one or more of 6 parts of dibenzoyl peroxide, 7 parts of dicumyl peroxide and 6 parts of azodicarbonamide (mixing them evenly when using more than one) to obtain an initiator;

[0040] S5: selecting one or more of 6 parts of alkylbenzene sulfonate, 7 parts of sodium lauryl sulfate, and 6 parts of sodium alkyl sulfonate (mixing them evenly when there are multiple parts) to obtain an emulsifier;

[0041] S6: Pour the pigment and water into the reactor and stir at a speed of 850 r / min, control the temperature at 60°C, add 60% of the total amount of the base material obtained in S1, 40% of the total amount of the crosslinking agent obtained in S2, 50% of the total amount of the regulator obtained in S3, 45% of the total amount of the emulsifier obtained in S5, and 60% of the total amount of the initiator obtained in S4 into the reactor in a dropwise manner, and stir for 1 hour;

[0042] S7: reduce the stirring speed to 350 / min, heat the temperature to 75°C, and react for 30 min;

[0043] S8 pours the remaining base material obtained from S1, the cross-linking agent obtained from S2, the regulator obtained from S3, the emulsifier obtained from S5 and the initiator obtained from S4 into the reactor, adds them into the reactor in a drop-by-drop manner, and then increases the stirring speed from 350 r / min to 850 r / min, maintains the temperature at 75°C, reacts for 3 hours, and evacuates the system to a vacuum degree of -1 MKPa for 1 hour, then cools it to room temperature to obtain pure acrylic latex.

[0044] Example 3

[0045] S1: selecting 30 parts of acrylic resin, 35 parts of alkyd resin, 25 parts of vinyl resin and 30 parts of water-based emulsion resin, mixing two or more of the above (in free combination) to obtain a base material;

[0046] S2: 10 parts of N-(2-hydroxyethyl)acrylamide, 6 parts of polymethyl methacrylate, 20 parts of polyvinyl alcohol and 15 parts of C12-14 alkyl glycidyl ether are mixed evenly to obtain a crosslinking agent;

[0047] S3: 10 parts of α-methylstyrene dimer and 10 parts of isooctyl thioglycolate are mixed evenly to obtain a regulator;

[0048] S4: selecting one or more of 8 parts of dibenzoyl peroxide, 10 parts of dicumyl peroxide and 10 parts of azodicarbonamide (mixing them evenly when using more than one) to obtain an initiator;

[0049] S5: selecting one or more of 10 parts of alkylbenzene sulfonate, 10 parts of sodium lauryl sulfate, and 8 parts of sodium alkyl sulfonate (mixing them uniformly when there are multiple parts) to obtain an emulsifier;

[0050] S6: Pour the pigment and water into the reactor and stir at a speed of 900 r / min, control the temperature at 65°C, add 60% of the total amount of the base material obtained in S1, 40% of the total amount of the cross-linking agent obtained in S2, 50% of the total amount of the regulator obtained in S3, 45% of the total amount of the emulsifier obtained in S5, and 60% of the total amount of the initiator obtained in S4 into the reactor in a dropwise manner, and stir for 1 hour;

[0051] S7: reduce the stirring speed to 400 / min, heat the temperature to 80°C, and react for 30 min;

[0052] S8 pours the remaining base material obtained from S1, the cross-linking agent obtained from S2, the regulator obtained from S3, the emulsifier obtained from S5 and the initiator obtained from S4 into the reactor, adds them into the reactor in a drop-by-drop manner, and then increases the stirring speed from 400r / min to 900r / min, maintains the temperature at 80°C, reacts for 2h, and evacuates the reactor to a vacuum degree of -1MKPa for 1h, then cools it to room temperature to obtain pure acrylic latex.

[0053] The pure acrylic latex prepared in Examples 1 to 3 of the present invention was applied with paint and dried, and then rubbed with linen to observe its discoloration;

[0054] Example / Number of frictions 1 / 100 2 / 200 3 / 300 Color fading none none none

[0055] The present invention and its implementation methods are described above, which is not restrictive and is one of the implementation methods of the present invention. The actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. Self-thickening pure acrylic latex for art pigment and its preparation method, consisting of base material, pigment, cross-linking agent, regulator, initiator, emulsifier and water; The base material is composed of a mixture of two or more of 15 to 30 parts of acrylic resin, 20 to 35 parts of alkyd resin, 10 to 25 parts of vinyl resin and 10 to 30 parts of water-based emulsion resin; The crosslinking agent is a mixture of two or more of 5 to 10 parts of N-(2-hydroxyethyl) acrylamide, 1 to 6 parts of polymethyl methacrylate, 15 to 20 parts of polyvinyl alcohol and 5 to 15 parts of C12-14 alkyl glycidyl ether. The regulator is prepared by mixing 5 to 10 parts of alpha-methylstyrene dimer and 2 to 10 parts of isooctyl thioglycolate. The initiator is composed of one or more of 5 to 8 parts of dibenzoyl peroxide, 3 to 10 parts of dicumyl peroxide and 2 to 10 parts of azodicarbonamide. The emulsifier is composed of one or more of 2 to 10 parts of alkylbenzene sulfonate, 5 to 10 parts of sodium dodecyl sulfate, and 3 to 8 parts of sodium alkyl sulfonate.

2. The method for preparing the self-thickening pure acrylic latex for art pigment according to claim 1, comprising at least the following steps: S1: selecting two or more of acrylic resin, alkyd resin, vinyl resin and water-based emulsion resin and mixing them evenly to obtain a base material; S2 selects two or more of N-(2-hydroxyethyl)acrylamide, polymethyl methacrylate, polyvinyl alcohol and C12-14 alkyl glycidyl ether and mixes them evenly to obtain a crosslinking agent; S3: select α-methylstyrene dimer and isooctyl thioglycolate and mix them evenly to obtain a regulator; S4 selects one or more of dibenzoyl peroxide, diisopropylbenzene peroxide and azodicarbonamide to obtain an initiator; S5 selects one or more of alkylbenzene sulfonate, sodium lauryl sulfate, and sodium alkyl sulfonate to obtain an emulsifier; S6: Pour the pigment and water into the reaction kettle and stir at a speed of 800-900 r / min, control the temperature at 55-65° C., add the base material obtained in S1, the crosslinking agent obtained in S2, the regulator obtained in S3, the emulsifier obtained in S5 and the initiator obtained in S4 into the reaction kettle in a dropwise manner, and stir for 1 hour; S7: reducing the stirring speed to 300-400 / min, heating the temperature to 70-80°C, and reacting the mixture for 30 min; S8 pours the remaining base material obtained from S1, the cross-linking agent obtained from S2, the regulator obtained from S3, the emulsifier obtained from S5 and the initiator obtained from S4 into the reactor, adds them into the reactor in a drop-by-drop manner, then increases the stirring speed, maintains the temperature at 70-80°C, reacts for 2 hours, and evacuates the reactor to a vacuum degree of -1 MKPa for 1 hour, then cools it to room temperature to obtain pure acrylic latex.

3. The self-thickening pure acrylic latex for art pigments and the preparation method thereof according to claim 1, characterized in that: The water used is purified water, distilled water or reverse osmosis water.