CN111393917A

CN111393917A - Water-based paint and preparation method thereof

Info

Publication number: CN111393917A
Application number: CN202010322579.9A
Authority: CN
Inventors: 苏开锦; 江织娘
Original assignee: Xiamen Jindexing Industry And Trade Co ltd
Current assignee: Xiamen Jindexing Industry And Trade Co ltd
Priority date: 2020-04-22
Filing date: 2020-04-22
Publication date: 2020-07-10

Abstract

The invention discloses a water-based paint and a preparation method thereof, belonging to the technical field of paints. The technical key points of the method are that the method comprises the following components in parts by weight: water 230-; 6-9 parts of nano cellulose fiber; 1-3 parts of a dispersant; 50-200 parts of titanium dioxide; 1.3-1.5 parts of a defoaming agent A; 2.5-3.5 parts of a defoaming agent B; 75-85 parts of kaolin; 400 portions of coarse whiting 350; 50-60 parts of talcum powder; 100 portions and 150 portions of styrene-acrylic emulsion; 2-3 parts of organic weak acid; 2-3 parts of a thickening agent; 2-3 parts of a preservative. Has the advantage of simultaneously treating the oil stain and the rust on the surface of the plate.

Description

Water-based paint and preparation method thereof

Technical Field

The invention belongs to the technical field of coatings, and particularly relates to a water-based coating and a preparation method thereof.

Background

The water-based paint is a paint which takes water as a diluent and does not contain organic solvent, does not contain benzene, toluene, xylene, formaldehyde and free TDI toxic heavy metal, is nontoxic, has no pungent smell, is harmless to human bodies, does not pollute the environment, has a plump paint film, is glittering and translucent, has good flexibility, and has the characteristics of water resistance, wear resistance, aging resistance, yellowing resistance, quick drying, convenient use and the like.

There are various water-based paints in the prior art, one of which is applied to the building surface polluted by oil, for example, the Chinese patent publication No. CN103614032B discloses a water-based paint which comprises methyl potassium alcoholate and a wetting agent with emulsification; after the water-based paint is coated on the surface of a wall body polluted by oil stain, the wetting agent permeates into the surface of the oil stain to emulsify oil into small drops, the small drops enter into the coating, react with potassium methyl siliconate in the coating and are solidified in the coating to become a filler of the coating, the purpose of beautifying and cleaning is achieved, and the pretreatment of wall surface renovation can be reduced.

For example, a Chinese patent with patent No. CN102838914B discloses a water-based rust-converting primer which can be painted with rust. The water-based rust conversion primer capable of being painted with rust consists of water-based mixed emulsion, a defoaming agent, a leveling agent, a dispersing agent, a pH regulator and the like. The water-based mixed emulsion is prepared by mixing single-component water-based epoxy capable of self-crosslinking at normal temperature and chlorine-containing emulsion. According to the invention, the single-component water-based epoxy capable of self-crosslinking at normal temperature is introduced into the water-based rust conversion primer, and the water-based epoxy is subjected to crosslinking reaction in the drying process of a coating film, so that the crosslinking density of the coating film is improved, and the corrosion resistance of the water-based rust conversion primer is greatly improved.

However, in the prior art, there are few water-based paints capable of treating oil stains and iron rust simultaneously, and when the paint is required to be coated on a rust iron plate stained with oil stains, the oil stains or the iron rust are required to be treated separately and then the corresponding paint is required to be coated, so that the operation is troublesome.

Therefore, a new solution is needed to solve the above problems.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the water-based paint which has the advantages of cleaning oil stains and rust on the plates and not needing to pretreat the surfaces of the plates.

The second purpose of the invention is to provide a preparation method of the water-based paint, which is used for preparing the water-based paint.

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

the water-based paint is characterized by comprising the following components in parts by weight: water 230-; 6-9 parts of nano cellulose fiber; 1-3 parts of a dispersant; 50-200 parts of titanium dioxide; 1.3-1.5 parts of a defoaming agent A; 2.5-3.5 parts of a defoaming agent B; 75-85 parts of kaolin; 400 portions of coarse whiting 350; 50-60 parts of talcum powder; 100 portions and 150 portions of styrene-acrylic emulsion; 2-3 parts of organic weak acid; 2-3 parts of a thickening agent; 2-3 parts of a preservative.

By adopting the technical scheme, when the water-based paint is used for painting the plate, under the action of organic weak acid, the iron rust is converted into ferric ions and is fused into the water-based paint, and the ferric ions are adsorbed on the nano cellulose fiber to form a compound, so that the iron removal effect is achieved, and the connecting force between the coating and the plate is improved; the crystal structure of the nano-cellulose fiber is destroyed, the accessibility of more surface exposed molecules is enhanced, and a large amount of hydroxyl is activated, so that the nano-cellulose fiber has an adsorption effect on oil stains on the plate, and the phenomenon that the original residual oil stains on the plate are transferred to the surface of a coating due to the evaporation of water in the drying process of the coating to influence the appearance due to the surface bloom is avoided.

More preferably, the nanocellulose fibers are hydroxylated modified nanocellulose fibers, and the hydroxylated modified nanocellulose fibers comprise the following steps:

s1, soaking 6-9 parts of dietary fiber raw materials in water until the raw materials are saturated with water, performing steam flash explosion activation treatment, drying after flash explosion, crushing, and sieving to obtain an activated material;

s2, adding 0.1-0.2 part of xylanase, 0.1-0.2 part of laccase and 0.2-0.3 part of cellulase into the activated material, adding a small amount of water to prepare a cellulose suspension, dispersing the cellulose suspension in a high-speed disperser, and carrying out high-pressure homogenization treatment to obtain nano cellulose fibers;

s3, adding 0.36-0.54 part of octenyl succinic anhydride or glycidyl methacrylate into the nano cellulose fiber under the alkalescent condition for modification to obtain the hydroxylated modified nano cellulose fiber.

By adopting the technical scheme, the dietary fiber raw material is treated by adopting a flash explosion method, the crystalline structure of cellulose is effectively destroyed, the molecular accessibility and the reactivity of the cellulose are increased, the hydroxyl can be further activated, and meanwhile, concentrated acid, alkali and an oxidant do not need to be used) to pretreat the lignocellulose, so that pollutants influencing the environment are avoided, and the pollution of the water-based coating to the environment is avoided.

Further preferably, the weak organic acid is one or more of citric acid, tannic acid and phosphoric acid.

By adopting the technical scheme, the organic weak acid adopts one or more of citric acid, tannic acid and phosphoric acid, so that iron oxide can be converted into iron ions, the iron ions are adsorbed on the nano cellulose fibers to form a compound, and the phenomenon that the organic weak acid is too strong to corrode the board is avoided.

More preferably, the dispersant is a sodium polycarboxylate dispersant.

Further preferably, the thickener is one or more of fumed silica, hydrophobic polyether compound, ethoxylated urethane polymer, nonionic polyurethane compound, and hydroxyethyl cellulose.

More preferably, the preservative is a benzomicazole ester.

By adopting the technical scheme, the preservative is used for preventing the coating from mildewing and corroding and prolonging the service life of the aqueous blackboard paint coating

More preferably, the defoaming agent A is a TP-39 defoaming agent, and the defoaming agent B is an NXZ defoaming agent.

By adopting the technical scheme, the TP-39 defoaming agent is used for removing foams generated in the production process of the water-based paint; the NXZ defoamer acts to suppress foam generated during use of the aqueous coating.

In order to achieve the second purpose, the invention provides the following technical scheme: the preparation method of the water-based paint is characterized by comprising the following steps: s1, adding water in corresponding weight parts into the reaction kettle, sequentially adding nanocellulose fibers and a dispersing agent in corresponding weight parts, and uniformly stirring; s2, sequentially adding the titanium dioxide, the defoamer A, the kaolin, the coarse whiting and the talcum powder into the reaction kettle in corresponding parts by weight, and uniformly stirring; s3, sequentially adding the styrene-acrylic emulsion and the thickening agent in corresponding parts by weight into the reaction kettle, and uniformly stirring; s4, sequentially adding the preservative, the defoaming agent B and the organic weak acid in corresponding weight parts into the reaction kettle, and uniformly stirring to obtain a mixture; and S5, filtering the mixture by using a vibrating screen, wherein the lower-layer filtrate is the water-based paint.

By adopting the technical scheme, the nanocellulose fibers and the dispersing agent are mixed in the water-based paint and are fully stirred in the reaction kettle, so that the nanocellulose fibers are uniformly distributed in the water-based paint, and when the organic paint is coated on the board, the nanocellulose fibers can clean rust and oil stains on the surface of the board.

More preferably, a surfactant is further added to S1, and the surfactant is potassium methylsilanolate.

By adopting the technical scheme, after the water-based paint is coated on the surface of the wall body polluted by oil stain, the surfactant permeates into the surface of the oil stain to emulsify oil into small drops which enter the coating, so that the small drops can be conveniently absorbed by the nano cellulose fiber and solidified in the coating to become the filler of the coating, the aim of beautifying and cleaning is fulfilled, and the pretreatment of plate renovation can be reduced.

More preferably, the mesh number of the vibrating screen is 200-250 meshes.

By adopting the technical scheme, the mesh number of the vibrating screen is 200-250 meshes, so that impurities in the water-based paint can be filtered, and the influence of the impurities on the water-based paint is avoided

In summary, compared with the prior art, the invention has the following beneficial effects:

(1) when the water-based paint is used for coating a plate, under the action of organic weak acid, rust is converted into ferric ions and is fused into the water-based paint, the ferric ions are adsorbed on the nano cellulose fibers to form a compound, so that the iron removal effect is achieved, and the connecting force between a coating and the plate is improved; (ii) a

(2) The crystal structure of the nano-cellulose fiber is damaged, the accessibility of more surface exposed molecules is enhanced, and a large number of hydroxyl groups are activated, so that the nano-cellulose fiber has an adsorption effect on oil stains on the plate, and the phenomenon that the residual oil stains on the plate can be transferred to the surface of a coating due to the evaporation of water in the drying process of the coating to cause the surface to be stained to influence the appearance is avoided;

(3) the organic weak acid adopts one or more of citric acid, tannic acid and phosphoric acid, so that iron oxide can be converted into iron ions, the iron ions are adsorbed on the nano cellulose fibers to form a compound, and the phenomenon that the organic weak acid is too strong to corrode the board is avoided.

Detailed Description

The present invention will be described in detail with reference to examples.

Example 1: a preparation method of a water-based paint is prepared by the following steps:

s1, soaking 6 parts of dietary fiber raw materials in water until the raw materials are saturated with water, carrying out steam flash explosion activation treatment, drying after flash explosion, crushing, and sieving to obtain an activated material;

s2, adding 0.1 part of xylanase, 0.1 part of laccase and 0.2 part of cellulase into the activated material, adding a small amount of water to prepare a cellulose suspension, dispersing the cellulose suspension in a high-speed disperser, and carrying out high-pressure homogenization treatment to obtain nano cellulose fibers;

s3, adding 0.36 part of octenyl succinic anhydride into the nano cellulose fiber for modification under the alkalescent condition to obtain hydroxylated modified nano cellulose fiber;

s4, adding 230 parts of water into a reaction kettle, sequentially adding the hydroxylated modified nanocellulose fibers and 1 part of sodium polycarboxylate dispersant, and stirring at the rotating speed of 700r/min for 15 min;

s5, sequentially adding 50 parts of titanium dioxide, 1.3 parts of TP-39 defoaming agent, 75 parts of kaolin, 350 parts of heavy calcium carbonate and 50 parts of talcum powder into the reaction kettle, and stirring for 60min at the rotating speed of 1400 r/min;

s6, sequentially adding 100 parts of styrene-acrylic emulsion and 2 parts of fumed silica into the reaction kettle, and stirring for 10min at the rotating speed of 400 r/min;

s7, sequentially adding 2 parts of benzomicle esters, 2.5 parts of NXZ defoaming agent and 2 parts of citric acid into the reaction kettle, and stirring at the rotating speed of 400r/min for 20min to obtain a mixture;

s8, filtering the mixture by using a vibrating screen with 200 meshes, wherein the lower-layer filtrate is the water-based paint.

Example 2: a preparation method of a water-based paint is prepared by the following steps:

s1, soaking 7.5 parts of dietary fiber raw materials in water until the raw materials are saturated with water, carrying out steam flash explosion activation treatment, drying after flash explosion, crushing, and sieving to obtain an activated material;

s2, adding 0.15 part of xylanase, 0.15 part of laccase and 0.25 part of cellulase into the activated material, adding a small amount of water to prepare a cellulose suspension, dispersing the cellulose suspension in a high-speed disperser, and carrying out high-pressure homogenization treatment to obtain nano cellulose fibers;

s3, adding 0.45 part of octenyl succinic anhydride into the nano cellulose fiber for modification under the alkalescent condition to obtain hydroxylated modified nano cellulose fiber;

s4, adding 265 parts of water into a reaction kettle, sequentially adding the hydroxylated modified nanocellulose fibers and 2 parts of sodium polycarboxylate dispersant, and stirring for 15min at the rotating speed of 700 r/min;

s5, adding 125 parts of titanium dioxide, 1.4 parts of TP-39 defoaming agent, 80 parts of kaolin, 375 parts of heavy calcium carbonate and 55 parts of talcum powder into the reaction kettle in sequence, and stirring for 60min at the rotating speed of 1400 r/min;

s6, adding 125 parts of styrene-acrylic emulsion and 2.5 parts of fumed silica into the reaction kettle in sequence, and stirring for 20min at the rotating speed of 400 r/min;

s7, sequentially adding 2.5 parts of benzomicle esters, 3 parts of NXZ defoaming agent and 2.5 parts of citric acid into the reaction kettle, and stirring at the rotating speed of 400r/min for 20min to obtain a mixture;

Example 3: a preparation method of a water-based paint is prepared by the following steps:

s2, adding 0.2 part of xylanase, 0.2 part of laccase and 0.3 part of cellulase into the activated material, adding a small amount of water to prepare a cellulose suspension, dispersing the cellulose suspension in a high-speed disperser, and carrying out high-pressure homogenization treatment to obtain nano cellulose fibers;

s3, adding 0.54 part of octenyl succinic anhydride into the nano cellulose fiber for modification under the alkalescent condition to obtain hydroxylated modified nano cellulose fiber;

s4, adding 300 parts of water into a reaction kettle, sequentially adding the hydroxylated modified nanocellulose fibers and 3 parts of sodium polycarboxylate dispersant, and stirring at the rotating speed of 700r/min for 15 min;

s5, sequentially adding 200 parts of titanium dioxide, 1.3-1.5 parts of TP-39 defoaming agent, 75-85 parts of kaolin, 400 parts of heavy calcium and 60 parts of talcum powder into the reaction kettle, and stirring for 60min at the rotating speed of 1400 r/min;

s6, sequentially adding 150 parts of styrene-acrylic emulsion and 3 parts of fumed silica into the reaction kettle, and stirring for 20min at the rotating speed of 400 r/min;

s7, sequentially adding 3 parts of benzomicle esters, 3.5 parts of NXZ defoaming agent and 3 parts of citric acid into the reaction kettle, and stirring at the rotating speed of 400r/min for 20min to obtain a mixture;

Example 4: a preparation method of a water-based paint is prepared by the following steps:

s3, adding 0.36 part of octenyl succinic anhydride or glycidyl methacrylate into the nano cellulose fiber under the alkalescent condition for modification to obtain hydroxylated modified nano cellulose fiber;

s4, adding 230 parts of water into a reaction kettle, sequentially adding the hydroxylated modified nanocellulose fibers and 1 part of sodium polycarboxylate dispersant, and stirring at the rotating speed of 800r/min for 13 min;

s5, sequentially adding 50 parts of titanium dioxide, 1.3 parts of TP-39 defoaming agent, 75 parts of kaolin, 350 parts of heavy calcium carbonate and 50 parts of talcum powder into the reaction kettle, and stirring for 50min at the rotating speed of 1450 r/min;

s6, sequentially adding 100 parts of styrene-acrylic emulsion and 2 parts of fumed silica into the reaction kettle, and stirring for 15min at the rotating speed of 500 r/min;

s7, sequentially adding 2 parts of benzomicle esters, 1.5 parts of NXZ defoaming agent and 2 parts of citric acid into the reaction kettle, and stirring for 15min at the rotating speed of 500r/min to obtain a mixture;

s8, filtering the mixture by using a 225-mesh vibrating screen, wherein the lower-layer filtrate is the water-based paint.

Example 5: a preparation method of a water-based paint is prepared by the following steps:

s4, adding 230 parts of water into a reaction kettle, sequentially adding the hydroxylated modified nanocellulose fibers and 1 part of sodium polycarboxylate dispersant, and stirring at the rotating speed of 850r/min for 10 min;

s5, sequentially adding 50 parts of titanium dioxide, 1.3 parts of TP-39 defoaming agent, 75 parts of kaolin, 350 parts of heavy calcium carbonate and 50 parts of talcum powder into the reaction kettle, and stirring for 40min at the rotating speed of 1500 r/min;

s6, sequentially adding 100 parts of styrene-acrylic emulsion and 2 parts of fumed silica into the reaction kettle, and stirring for 10min at the rotating speed of 600 r/min;

s7, sequentially adding 2 parts of benzomicle esters, 1.5 parts of NXZ defoaming agent and 2 parts of citric acid into the reaction kettle, and stirring at the rotating speed of 600r/min for 10min to obtain a mixture;

s8, filtering the mixture by using a vibrating screen with 250 meshes, wherein the lower-layer filtrate is the water-based paint.

Example 6:

a method for preparing a water-based paint, which is different from example 5 in that octenyl succinic anhydride in S3 is replaced by glycidyl methacrylate in equal parts by weight.

Example 7:

a method for preparing a water-based paint, which is different from example 5 in that citric acid in S7 is replaced with tannic acid in equal parts by weight.

Example 8:

a method for preparing a water-based paint, which is different from example 5 in that citric acid in S7 is replaced with phosphoric acid in equal parts by weight.

Example 9:

a method for preparing an aqueous coating material, which is different from example 5 in that citric acid in S7 was replaced with equal parts by weight of a mixture of tannic acid and phosphoric acid in a weight ratio of 1: 1.

Example 10:

a method for preparing a water-based paint, which is different from the method in example 5 in that citric acid in S7 is replaced by a mixture of citric acid and phosphoric acid in equal parts by weight, and the weight ratio of the mixture of citric acid and phosphoric acid is 1: 1.

Example 11:

a method for preparing an aqueous coating material, which is different from example 5 in that citric acid in S7 is replaced with an equal weight part of a mixture of citric acid, tannic acid and phosphoric acid, and the weight ratio of citric acid, tannic acid and phosphoric acid is 1:1: 1.

Example 12:

a method for preparing a water-based paint, which is different from example 5 in that fumed silica in S6 is replaced with an equal weight part of a hydrophobic polyether compound.

Example 13:

a method for preparing a water-based paint, which is different from example 5 in that fumed silica in S6 is replaced with an equal part by weight of an ethoxylated urethane polymer.

Example 14:

a method for preparing a water-based paint, which is different from example 5 in that fumed silica in S6 is replaced with an equal weight part of a non-ionic polyurethane compound.

Example 15:

a method for preparing a water-based paint, which is different from example 5 in that gas-phase silica in S6 is replaced by hydroxyethyl cellulose in an equal weight part.

Example 16:

a method for producing an aqueous coating material, which is different from example 5 in that fumed silica in S6 is replaced with a mixture of fumed silica and a hydrophobic polyether compound in an equal weight part ratio of 1: 1.

Example 17:

a method for producing an aqueous coating material, which is different from example 5 in that fumed silica in S6 is replaced with equal parts by weight of an ethoxylated urethane polymer and a nonionic polyurethane compound in a weight ratio of 1: 1.

Example 18:

a method for producing an aqueous coating material, which is different from example 5 in that fumed silica in S6 is replaced with a mixture of fumed silica, an ethoxylated urethane polymer, and hydroxyethyl cellulose in an equal weight part ratio of 1:1: 1.

Example 19:

the preparation method of the water-based paint is different from the preparation method of the water-based paint in example 5 in that 2 parts of potassium methyl siliconate is further added into S3.

Example 20:

the preparation method of the water-based paint is different from the preparation method of the water-based paint in example 5 in that 3 parts of potassium methyl siliconate is further added into S3.

Comparative example 1:

a preparation method of a water-based paint is prepared by the following steps:

s1, adding 230 parts of water into a reaction kettle, sequentially adding 5 parts of cellulose and 1 part of sodium polycarboxylate dispersant, and stirring for 10min at the rotating speed of 850 r/min;

s2, sequentially adding 50 parts of titanium dioxide, 1.3 parts of TP-39 defoaming agent, 75 parts of kaolin, 350 parts of heavy calcium carbonate and 50 parts of talcum powder into the reaction kettle, and stirring for 40min at the rotating speed of 1500 r/min;

s3, sequentially adding 100 parts of styrene-acrylic emulsion and 2 parts of fumed silica into the reaction kettle, and stirring for 10min at the rotating speed of 600 r/min;

s4, sequentially adding 2 parts of benzomicle esters, 1.5 parts of NXZ defoaming agent and 2 parts of citric acid into the reaction kettle, and stirring at the rotating speed of 600r/min for 10min to obtain a mixture;

s5, filtering the mixture by using a vibrating screen with 250 meshes, wherein the lower-layer filtrate is the water-based paint.

test-Performance test

The organic paints prepared in examples 1 to 20 and comparative example 1 were coated on rusty iron plates, and the performance indexes thereof are shown in table 1.

Table 1: performance index of organic coating materials prepared in examples 1 to 20 and comparative example 1

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. The water-based paint is characterized by comprising the following components in parts by weight:

water 230-;

6-9 parts of nano cellulose fiber;

1-3 parts of a dispersant;

50-200 parts of titanium dioxide;

1.3-1.5 parts of a defoaming agent A;

2.5-3.5 parts of a defoaming agent B;

75-85 parts of kaolin;

400 portions of coarse whiting 350;

50-60 parts of talcum powder;

100 portions and 150 portions of styrene-acrylic emulsion;

2-3 parts of organic weak acid;

2-3 parts of a thickening agent;

2-3 parts of a preservative.

2. The aqueous coating according to claim 1, wherein the nanocellulose fibers are hydroxylated modified nanocellulose fibers, and the hydroxylated modified nanocellulose fibers comprise the following steps:

3. The aqueous coating of claim 1, wherein the weak organic acid is one or more of citric acid, tannic acid, and phosphoric acid.

4. The aqueous coating of claim 1, wherein the dispersant is a sodium polycarboxylate dispersant.

5. The water-based paint as claimed in claim 1, wherein the defoamer A is TP-39 defoamer, and the defoamer B is NXZ defoamer.

6. The preparation method of the water-based paint is characterized by comprising the following steps:

s1, adding water in corresponding weight parts into the reaction kettle, sequentially adding nanocellulose fibers and a dispersing agent in corresponding weight parts, and uniformly stirring;

s2, sequentially adding the titanium dioxide, the defoamer A, the kaolin, the coarse whiting and the talcum powder into the reaction kettle in corresponding parts by weight, and uniformly stirring;

s3, sequentially adding the styrene-acrylic emulsion and the thickening agent in corresponding parts by weight into the reaction kettle, and uniformly stirring;

s4, sequentially adding the preservative, the defoaming agent B and the organic weak acid in corresponding weight parts into the reaction kettle, and uniformly stirring to obtain a mixture;

and S5, filtering the mixture by using a vibrating screen, wherein the lower-layer filtrate is the water-based paint.

7. The method for preparing the water-based paint according to claim 6, wherein a surfactant is further added in the S1, and the surfactant is potassium methyl siliconate.

8. The method as claimed in claim 6, wherein the vibrating screen has a mesh size of 200-250 meshes.