阅读说明：本技术 一种提高干燥速率的水性丙烯酸氨基清漆及其制备方法 (Water-based acrylic amino varnish for improving drying rate and preparation method thereof ) 是由 江孝林 狄成敏 于 2020-07-24 设计创作，主要内容包括：本发明公开了一种提高干燥速率的水性丙烯酸氨基清漆及其制备方法,包括水性羟基丙烯酸树脂、引发剂、有机溶剂、碱性中和剂、氨基树脂、消泡剂、流平剂、湿润剂、去离子水、脱水剂、pH调节剂和组分GaO,在水性丙烯酸氨基清漆的制备过程的最后,通过添加脱水剂聚丙烯酰胺,使清漆内的水分子与聚丙烯酰胺接触形成絮状沉淀,再向其中添加不同量的GaO,在进行设备或墙面的涂膜过程中,在清漆表面均匀淋水,使GaO与水接触后反应得到Ga(OH)2,同时放出热量,通过放出的热量来对涂膜表面进行烘干干燥操作,在避免清漆内物质变质的情况下,有效提高水性丙烯酸氨基清漆的干燥速率,方便于各类设备或墙面的涂膜操作。(The invention discloses a water-based acrylic amino varnish for improving drying rate and a preparation method thereof, which comprises water-based hydroxy acrylic resin, an initiator, an organic solvent, a basic neutralizer, amino resin, a defoaming agent, a leveling agent, a wetting agent, deionized water, a dehydrating agent, a pH regulator and a component GaO, wherein at the end of the preparation process of the water-based acrylic amino varnish, the dehydrating agent polyacrylamide is added to ensure that water molecules in the varnish contact with the polyacrylamide to form flocculent precipitates, then different amounts of GaO are added to the flocculent precipitates, water is uniformly sprayed on the surface of the varnish during the coating process of equipment or wall surfaces, the GaO reacts with the water after contacting to obtain Ga (OH)2, simultaneously heat is released, the surface of the coating is dried by the released heat, and the drying rate of the water-based acrylic amino varnish is effectively improved under the condition of avoiding the deterioration of substances in the varnish, is convenient for the film coating operation of various devices or wall surfaces.)

1. The water-based acrylic amino varnish capable of improving the drying rate is characterized by comprising the following components in parts by weight: 25 components of water-based hydroxy acrylic resin, 5 components of initiator, 15 components of organic solvent, 10 components of alkaline neutralizer, 25 components of amino resin, 5 components of defoamer, 5 components of flatting agent, 5 components of wetting agent, 20 components of deionized water, 15 components of dehydrating agent, 10 components of pH regulator and 8-20 components of GaO.

2. The drying rate-improving aqueous acrylic amino varnish according to claim 1, comprising the following components in parts by weight: 25 components of water-based hydroxy acrylic resin, 5 components of initiator, 15 components of organic solvent, 10 components of alkaline neutralizer, 25 components of amino resin, 5 components of defoamer, 5 components of flatting agent, 5 components of wetting agent, 20 components of deionized water, 15 components of dehydrating agent, 10 components of pH regulator and 8 components of GaO.

3. The drying rate-improving aqueous acrylic amino varnish according to claim 1, comprising the following components in parts by weight: 25 components of water-based hydroxy acrylic resin, 5 components of initiator, 15 components of organic solvent, 10 components of alkaline neutralizer, 25 components of amino resin, 5 components of defoamer, 5 components of flatting agent, 5 components of wetting agent, 20 components of deionized water, 15 components of dehydrating agent, 10 components of pH regulator and 14 components of GaO.

4. The drying rate-improving aqueous acrylic amino varnish according to claim 1, comprising the following components in parts by weight: 25 components of water-based hydroxy acrylic resin, 5 components of initiator, 15 components of organic solvent, 10 components of alkaline neutralizer, 25 components of amino resin, 5 components of defoamer, 5 components of flatting agent, 5 components of wetting agent, 20 components of deionized water, 15 components of dehydrating agent, 10 components of pH regulator and 20 components of GaO.

5. The aqueous acrylic amino varnish for increasing drying rate according to claim 1, wherein: the initiator is prepared by mixing and stirring azodiisobutyronitrile and dibenzoyl peroxide according to the ratio of 1: 1.

6. The aqueous acrylic amino varnish for increasing drying rate according to claim 1, wherein: the alkaline neutralizing agent is prepared by mixing and stirring tributylamine and triethylamine according to the ratio of 2: 1.

7. The aqueous acrylic amino varnish for increasing drying rate according to claim 1, wherein: the dehydrating agent is polyacrylamide.

8. A method for preparing the aqueous acrylic amino varnish for increasing the drying rate according to any one of claims 1 to 7, comprising the steps of:

s1: pouring the water-based hydroxyl acrylic resin, the amino resin and the deionized water into a reaction kettle, continuously introducing nitrogen into the reaction kettle, and uniformly stirring the water-based hydroxyl acrylic resin, the amino resin and the deionized water by using stirring equipment;

s2: adding an initiator and an organic solvent into a reaction kettle, raising the temperature of the reaction kettle to 100 ℃, continuously stirring, standing, sequentially adding a defoaming agent, a leveling agent and a wetting agent into the reaction kettle, and uniformly stirring again;

s3: adding an alkaline neutralizing agent and a pH regulator into a reaction kettle, regulating substances in the reaction kettle to be weakly acidic, filtering out solid impurities in the reaction kettle by using a filtering device, and continuously adding a dehydrating agent into clear liquid drop by drop;

s4: when the substances in the reaction kettle appear flocculent precipitate, stirring at low speed for 10-20min by using stirring equipment, and filtering out the flocculent precipitate by using filtering equipment;

s5: adding GaO solid particles into the solution, uniformly stirring by using a stirring device, filling the solution into a filling bucket for varnish, and storing.

9. The method for preparing the aqueous acrylic amino varnish for improving the drying rate as claimed in claim 8, wherein the method for preparing the aqueous hydroxy acrylic resin comprises the following steps:

s101: mixing deionized water and a certain amount of composite emulsifier, stirring for dissolving, slowly dropwise adding monomer mixed solution of acrylic acid, ethyl acrylate, propyl acrylate, butyl acrylate and isooctyl acrylate, pre-emulsifying for 10min to obtain emulsion;

s102: adding deionized water, a composite emulsifier and a pH buffering agent into a reaction kettle, stirring, raising the temperature to 75 ℃, adding an emulsion into the reaction kettle, stirring and dispersing, and raising the temperature to 85 ℃;

s103: adding an initiator into the reaction kettle, continuously dropwise adding the monomer mixed solution and the initiator into the reaction kettle after emulsion in the reaction kettle turns blue, stirring for reaction, and continuously stirring for 30min in a heat-preservation state after dropwise adding is finished;

s104: and after standing and cooling the emulsion in the reaction kettle to room temperature, neutralizing with ammonia water and adjusting the pH value to about 8, and filtering with filtering equipment to obtain the aqueous hydroxyl acrylic resin.

Technical Field

The invention relates to the technical field of varnish, in particular to a water-based acrylic amino varnish capable of improving drying rate and a preparation method thereof.

Background

The waterborne acrylic amino varnish is an epoxy modified acrylic waterborne resin which is autonomously synthesized by a special process, the product is a baking varnish which is prepared by matching waterborne resin, high-quality pigment and filler, an auxiliary agent, water and the like with amino resin, the water resistance is not abnormal, the coating film of the product can achieve the decorative effect of an aluminum-plastic-imitated plate, the product has excellent metal texture and metal luster, excellent light and color retention, tough coating film, good impact resistance and wear resistance, scratch resistance, excellent acid resistance, alkali resistance, multiple chemical medicine resistance and salt mist resistance, high hardness and good adhesive force, the VOC residue detection of the coating film passes the European environment-friendly detection and is extremely popular with export enterprises, the waterborne acrylic amino varnish in the prior art needs a large amount of time to be spent for drying the coating film after coating, and when drying equipment is used for drying the surface of the coating film, the drying temperature is uncontrollable, the deterioration of the internal substances of the varnish can be caused, thereby affecting the actual effect of the coating, and the time for fine drying and film forming is long, thus being not beneficial to the large-scale varnish coating process.

Disclosure of Invention

The invention aims to provide a water-based acrylic amino varnish capable of improving the drying rate and a preparation method thereof, at the end of the preparation process of the water-based acrylic amino varnish, polyacrylamide serving as a dehydrating agent is added to enable water molecules in the varnish to be in contact with the polyacrylamide to form flocculent precipitates, then different amounts of GaO are added to the flocculent precipitates, after the varnish is coated in the process of coating on equipment or walls, water is uniformly sprayed on the surface of the varnish, the GaO is in contact with the water and reacts to obtain Ga (OH)2, heat is released at the same time, and the surface of the coated film is dried and dried by the released heat, wherein the speed of the drying rate is determined by the content of the added GaO, so that the drying rate of the water-based acrylic amino varnish is effectively improved under the condition of avoiding the deterioration of substances in the varnish, and the problem brought forward in the background technology is solved.

In order to achieve the purpose, the invention provides the following technical scheme:

an aqueous acrylic amino varnish for improving drying rate comprises the following components in parts by weight: 25 components of water-based hydroxy acrylic resin, 5 components of initiator, 15 components of organic solvent, 10 components of alkaline neutralizer, 25 components of amino resin, 5 components of defoamer, 5 components of flatting agent, 5 components of wetting agent, 20 components of deionized water, 15 components of dehydrating agent, 10 components of pH regulator and 8-20 components of GaO.

Preferably, the composition comprises the following components in parts by weight: 25 components of water-based hydroxy acrylic resin, 5 components of initiator, 15 components of organic solvent, 10 components of alkaline neutralizer, 25 components of amino resin, 5 components of defoamer, 5 components of flatting agent, 5 components of wetting agent, 20 components of deionized water, 15 components of dehydrating agent, 10 components of pH regulator and 8 components of GaO.

Preferably, the composition comprises the following components in parts by weight: 25 components of water-based hydroxy acrylic resin, 5 components of initiator, 15 components of organic solvent, 10 components of alkaline neutralizer, 25 components of amino resin, 5 components of defoamer, 5 components of flatting agent, 5 components of wetting agent, 20 components of deionized water, 15 components of dehydrating agent, 10 components of pH regulator and 14 components of GaO.

Preferably, the composition comprises the following components in parts by weight: 25 components of water-based hydroxy acrylic resin, 5 components of initiator, 15 components of organic solvent, 10 components of alkaline neutralizer, 25 components of amino resin, 5 components of defoamer, 5 components of flatting agent, 5 components of wetting agent, 20 components of deionized water, 15 components of dehydrating agent, 10 components of pH regulator and 20 components of GaO.

Preferably, the initiator is prepared by mixing and stirring azobisisobutyronitrile and dibenzoyl peroxide according to a ratio of 1: 1.

Preferably, the alkaline neutralizing agent is prepared by mixing and stirring tributylamine and triethylamine according to the ratio of 2: 1.

Preferably, the dehydrating agent is polyacrylamide.

The invention provides another technical scheme: a preparation method of water-based acrylic amino varnish for improving drying rate comprises the following steps:

the method comprises the following steps: pouring the water-based hydroxyl acrylic resin, the amino resin and the deionized water into a reaction kettle, continuously introducing nitrogen into the reaction kettle, and uniformly stirring the water-based hydroxyl acrylic resin, the amino resin and the deionized water by using stirring equipment;

step two: adding an initiator and an organic solvent into a reaction kettle, raising the temperature of the reaction kettle to 100 ℃, continuously stirring, standing, sequentially adding a defoaming agent, a leveling agent and a wetting agent into the reaction kettle, and uniformly stirring again;

step three: adding an alkaline neutralizing agent and a pH regulator into a reaction kettle, regulating substances in the reaction kettle to be weakly acidic, filtering out solid impurities in the reaction kettle by using a filtering device, and continuously adding a dehydrating agent into clear liquid drop by drop;

step four: when the substances in the reaction kettle appear flocculent precipitate, stirring at low speed for 10-20min by using stirring equipment, and filtering out the flocculent precipitate by using filtering equipment;

step five: adding GaO solid particles into the solution, uniformly stirring by using a stirring device, filling the solution into a filling bucket for varnish, and storing.

Preferably, the preparation method of the aqueous hydroxy acrylic resin comprises the following steps:

step one, zero one: mixing deionized water and a certain amount of composite emulsifier, stirring for dissolving, slowly dropwise adding monomer mixed solution of acrylic acid, ethyl acrylate, propyl acrylate, butyl acrylate and isooctyl acrylate, pre-emulsifying for 10min to obtain emulsion;

step one, zero and two: adding deionized water, a composite emulsifier and a pH buffering agent into a reaction kettle, stirring, raising the temperature to 75 ℃, adding an emulsion into the reaction kettle, stirring and dispersing, and raising the temperature to 85 ℃;

step one, zero and three: adding an initiator into the reaction kettle, continuously dropwise adding the monomer mixed solution and the initiator into the reaction kettle after emulsion in the reaction kettle turns blue, stirring for reaction, and continuously stirring for 30min in a heat-preservation state after dropwise adding is finished;

step one, zero and four: and after standing and cooling the emulsion in the reaction kettle to room temperature, neutralizing with ammonia water and adjusting the pH value to about 8, and filtering with filtering equipment to obtain the aqueous hydroxyl acrylic resin.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides a water-based acrylic amino varnish for improving drying rate and a preparation method thereof, at the end of the preparation process of the water-based acrylic amino varnish, adding a dehydrating agent polyacrylamide to enable water molecules in the varnish to contact with the polyacrylamide to form flocculent precipitates, adding different amounts of GaO into the flocculent precipitates, in the process of coating on equipment or wall surfaces, after the varnish is coated, water is uniformly sprayed on the surface of the varnish, the GaO is contacted with the water and reacts to obtain Ga (OH)2, heat is released simultaneously, the surface of the coating is dried by the released heat, wherein the drying speed is determined by the content of the added GaO, the formula and the preparation method of the invention are complete and reasonable, under the condition of avoiding the deterioration of substances in the varnish, the drying rate of the water-based acrylic amino varnish is effectively improved, and the water-based acrylic amino varnish is convenient for the film coating operation of various devices or wall surfaces.

Drawings

FIG. 1 is a flow chart of the preparation process steps of the aqueous acrylic amino varnish of the present invention;

FIG. 2 is a flow chart of the preparation process steps of the aqueous hydroxy acrylic resin of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.