Water-based uv primer for floor and preparation method thereof

Abstract

The application relates to the field of paint technology and discloses a water-based UV primer for floor and a preparation method thereof. The water-based UV primer is formed by mixing water-based UV polyurethane emulsion as a film-forming material, modified jute fiber, defoaming agent, thickening agent and the like as auxiliary materials. The modified jute fiber is prepared by modifying macromolecular substances with polyether and triallyl ether alternately connected on the surface of jute fiber. The macromolecular substance structure contains a large number of triallyl ether structures. The allyl groups can participate in the subsequent photocuring process of the paint, so that the covalent connection of the jute fiber and the paint molecular chain is realized. Therefore, the jute fiber can exist in the form of a chemical core in the coating layer formed by photocuring of the paint, and the jute fiber can strengthen and toughen the coating layer. Meanwhile, the macromolecular substance structure contains a large number of ether bonds, and the ether bonds can improve the adhesion of the paint film, thereby improving the problem of poor interlayer adhesion.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coating technology, in particular to a water-based UV primer for floor and a preparation method thereof. BACKGROUND

[0002] With the enhancement of environmental awareness and the popularization of green building concept, the floor industry is undergoing a profound transformation. In the traditional floor coating process, solvent-based coatings contain a large amount of volatile organic compounds (VOCs), which pose a threat to the environment and human health. With the global emphasis on environmental protection, low-VOC or even zero-VOC coatings have become an inevitable trend in the industry. In this transformation, water-based UV paint for floor, as a new material combining the environmental advantages of water-based paint and the high efficiency of UV curing technology, has become a key factor in promoting the upgrading of the floor industry.

[0003] Currently, the construction process using UV primer with water-based topcoat has the advantages of high coating efficiency and good environmental protection. However, poor interlayer adhesion between UV primer and water-based topcoat often occurs, and wood floors may deform during use, which requires the primer to have a certain flexibility to prevent paint film cracking caused by wood floor deformation. The water-based UV primer currently has relatively poor flexibility, which hinders the further development of water-based UV primer in the floor industry to varying degrees. Therefore, the present application provides a water-based UV primer for floor to solve the problems existing in the prior art. SUMMARY

[0004] To solve the problems mentioned in the background art, the purpose of the present application is to provide a water-based UV primer for floor and a preparation method thereof.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A water-based UV primer for floor, comprising the following raw materials in parts by weight:

[0007] 75-95 parts of water-based UV polyurethane emulsion, 1-3 parts of photoinitiator, 3-5 parts of modified jute fiber, 0.5-1.5 parts of defoaming agent, 0.5-1 part of thickening agent, 0.1-0.5 part of wetting dispersant, 5-10 parts of pigment, 0.5-1 part of leveling agent, 1-3 parts of film-forming aid;

[0008] As a further scheme of the present application, the photoinitiator is at least one of photoinitiator 1173, photoinitiator 184 or photoinitiator TPO.

[0009] As a further scheme of the present application, the preparation method of the modified jute fiber is as follows:

[0010] Step S1, the pretreated jute fibers are added into toluene medium, after being uniformly dispersed, halogenated isocyanate and catalyst are continuously added, after the addition, the temperature is increased to 80℃, after 8h of temperature maintaining and stirring, the temperature is decreased to discharge, and halogenated jute fibers are prepared;

[0011] Step S2, the halogenated jute fibers are dispersed in N,N-dimethylformamide medium, then polytetrahydrofuran ether diol with a number average molecular weight of 2000 and alkaline hydroxide aqueous solution are added into the formed dispersant, after the addition, the temperature is increased to 70℃, after 4h of temperature maintaining, chain extender is continuously added, after the addition, the temperature is increased to 80℃, and chain extension polymerization is carried out for 16h, the temperature is decreased to discharge, the product is centrifuged to discharge, and modified jute fibers are prepared.

[0012] As a further scheme of the present application, the catalyst is any one of dibutyltin dilaurate, dibutyltin diacetate or stannous octoate.

[0013] As a further scheme of the present application, the halogenated isocyanate is chloroethyl isocyanate or 3-chloropropyl isocyanate.

[0014] As a further scheme of the present application, the specific method of the pretreatment is as follows:

[0015] The jute fibers are added into sodium hydroxide aqueous solution with a mass fraction of 10-20%, after being uniformly stirred and mixed, the temperature is increased to 60-70℃, after 3-6h of soaking, the jute fibers are taken out, and after washing and drying treatment, the jute fibers are obtained.

[0016] As a further scheme of the present application, the preparation method of the chain extender is as follows:

[0017] 3-bromo-2-bromomethylpropionic acid is added into tetrahydrofuran, after being stirred to form a uniform mixture, an accelerator and a condensing agent are added into the mixture, stirring is carried out at a temperature of 30℃ for 1h, pentaerythritol triallyl ether is continuously added into the mixture, after the addition, condensation reaction is carried out at a temperature of 50℃ for 3h, and the product is purified to obtain.

[0018] As a further scheme of the present application, the accelerator is 4-dimethylaminopyridine or N-hydroxysuccinimide; and the condensing agent is dicyclohexyl carbodiimide or 1-(3-dimethylaminopropyl)-3-ethyl carbodiimide.

[0019] As a further scheme of the present application, the alkaline hydroxide aqueous solution is potassium hydroxide aqueous solution or sodium hydroxide aqueous solution, and the mass fraction is 20-30%.

[0020] In the technical scheme, firstly, the jute fiber is subjected to alkali treatment by using sodium hydroxide solution to fully expose hydroxyl functional groups on the surface of the jute fiber, then, under the action of a catalyst, amine esterification reaction is carried out between halogenated isocyanate and the hydroxyl groups to modify halogen on the surface of the jute fiber to obtain halogenated jute fiber, finally, polyether diol is used as a bridging agent to link the halogenated jute fiber with the chain extender, and the excess polyether diol can continuously replace the chain extender under the action of alkali hydroxide, so that the polyether and triallyl ether alternately connected macromolecular substances are modified on the surface of the jute fiber, i.e., the modified jute fiber.

[0021] A preparation method of a water-based UV primer for floor, comprising the following steps:

[0022] In the first step, the water-based UV polyurethane emulsion, defoaming agent, thickening agent, wetting dispersant and leveling agent are added into a high-speed stirrer, the rotating speed is controlled to be 300-500 r / min, and mechanical stirring is carried out for 10-15 min to form a premix;

[0023] In the second step, the photoinitiator, modified jute fiber, pigment and film-forming aid are added into the premix under stirring, after the addition is completed, the rotating speed is adjusted to be 1000-2000 r / min, and stirring is continuously carried out for 20-40 min, then the stirring is stopped, and the product is discharged.

[0024] The beneficial effects of the present application are as follows:

[0025] The present application modifies the polyether and triallyl ether alternately connected macromolecular substances on the surface of the jute fiber to obtain the modified jute fiber, the macromolecular substance structure contains a large number of triallyl ether structures, the allyl groups can participate in the subsequent photocuring process of the coating, thus realizing the covalent connection between the jute fiber and the molecular chain of the coating, therefore, the jute fiber can exist in the form of a chemical core in the coating layer formed by photocuring of the coating, and the jute fiber can enhance and toughen the coating layer, meanwhile, the macromolecular substance structure contains a large number of ether bonds, which can improve the adhesion of the paint film, thereby improving the poor interlayer adhesion.

[0026] Of course, it is not necessary for any product implementing the present application to achieve all the advantages mentioned above. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed for the embodiment description will be briefly introduced as follows, and obviously, the drawings in the following description can only be some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0028] Figure 1The infrared spectrum of the chain extender. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0030] Embodiment 1

[0031] A water-based UV primer for floor, comprising the following raw materials in parts by weight:

[0032] water-based UV polyurethane emulsion 75 parts, photoinitiator 1173 1 part, modified jute fiber 3 parts, defoaming agent 0.5 part, thickening agent 0.5 part, wet dispersing agent 0.1 part, pigment 5 parts, leveling agent 0.5 part, film-forming aid 1 part;

[0033] The preparation method of the water-based UV primer comprises the following steps:

[0034] First step, the water-based UV polyurethane emulsion, defoaming agent, thickening agent, wet dispersing agent and leveling agent are added into a high-speed stirrer, the rotating speed is controlled to be 300 r / min, and mechanical stirring is mixed for 15 min to form a premix;

[0035] Second step, under stirring condition, the photoinitiator, modified jute fiber, pigment and film-forming aid are added into the premix, after the addition is completed, the rotating speed is adjusted to be 1000 r / min, and stirring is continued for 40 min, then the stirring is stopped, and the material is discharged.

[0036] The water-based UV resin is purchased from Guangdong Xindong New Material Technology Co., Ltd., and the model number is QDSRAYS UV215; the defoaming agent is BYK-055; the thickening agent is hydroxyethyl cellulose; the wet dispersing agent is BYK-346; the pigment is talc; the leveling agent is BYK-358N; and the film-forming aid is dipropylene glycol methyl ether, which are all the same.

[0037] Embodiment 2

[0038] A water-based UV primer for floor, comprising the following raw materials in parts by weight:

[0039] water-based UV polyurethane emulsion 80 parts, photoinitiator 1173 2 parts, modified jute fiber 4.5 parts, defoaming agent 1 part, thickening agent 0.6 part, wet dispersing agent 0.2 part, pigment 6 parts, leveling agent 0.8 part, film-forming aid 2 parts;

[0040] The preparation method of the water-based UV primer comprises the following steps:

[0041] First step, the water-based UV polyurethane emulsion, defoaming agent, thickening agent, wet dispersing agent and leveling agent are added into a high-speed mixer, the rotating speed is controlled to be 400 r / min, and mechanical stirring is mixed for 15 min to form a premix;

[0042] Second step, under the stirring condition, the photoinitiator, modified jute fiber, pigment and film-forming aid are added into the premix, after the addition is completed, the rotating speed is adjusted to be 1500 r / min, and the stirring is continuously carried out for 30 min, then the stirring is stopped, and the material is discharged, and the operation is completed.

[0043] Example 3

[0044] A water-based UV primer for floor comprises the following raw materials in parts by weight:

[0045] Water-based UV polyurethane emulsion 95 parts, photoinitiator 11733 parts, modified jute fiber 5 parts, defoaming agent 1.5 parts, thickening agent 1 part, wet dispersing agent 0.5 part, pigment 10 parts, leveling agent 1 part, film-forming aid 3 parts;

[0046] The preparation method of the water-based UV primer comprises the following steps:

[0047] First step, the water-based UV polyurethane emulsion, defoaming agent, thickening agent, wet dispersing agent and leveling agent are added into a high-speed mixer, the rotating speed is controlled to be 500 r / min, and mechanical stirring is mixed for 10 min to form a premix;

[0048] Second step, under the stirring condition, the photoinitiator, modified jute fiber, pigment and film-forming aid are added into the premix, after the addition is completed, the rotating speed is adjusted to be 2000 r / min, and the stirring is continuously carried out for 20 min, then the stirring is stopped, and the material is discharged, and the operation is completed.

[0049] The modified jute fiber in the above examples is prepared by the following method:

[0050] Step one, 5 g of jute fiber is added into 100 mL of 20% sodium hydroxide aqueous solution, and stirring is uniformly carried out, then the temperature is increased to 65 ℃, and after soaking for 4 h, the jute fiber is taken out, and after washing and drying treatment, the operation is completed;

[0051] Step two, 3.5 g of pretreated jute fiber is added into toluene medium, and after uniform dispersion, 1.2 g of chloroethyl isocyanate and 0.1 g of dibutyltin dilaurate are continuously added, after the addition is completed, the temperature is increased to 80 ℃, and after soaking and stirring for 8 h, the temperature is decreased, and the material is discharged, and the halogenated jute fiber is prepared.

[0052] Step three, 1.8g halogenated jute fibers are dispersed in N,N-dimethylformamide medium, then 5g polytetrahydrofuran ether glycol with a number average molecular weight of 2000 and 5mL 30% mass fraction sodium hydroxide aqueous solution are added to the formed dispersant, after addition, the temperature is raised to 70℃, and after 4h of incubation, 1.2g chain extender is continuously added, after addition, the temperature is raised to 80℃, and chain extension polymerization is carried out for 16h, and then the temperature is lowered to discharge the product, centrifugation to obtain the modified jute fibers.

[0053] The preparation method of the chain extender is as follows:

[0054] 0.3g of 3-bromo-2-bromomethylpropionic acid is added to tetrahydrofuran, stirred to form a uniform mixture, then 0.01g of N-hydroxysuccinimide and 0.04g of dicyclohexyl carbodiimide are added to the mixture, stirred at a temperature of 30℃ for 1h, 0.5g of pentaerythritol triallyl ether is continuously added to the mixture, after addition, condensation reaction is carried out at a temperature of 50℃ for 3h, and the product is purified.

[0055] The chain extender is subjected to infrared analysis test, and the results are shown in Figure 1 The characteristic absorption peak at 3063cm -1 belongs to the carbon-hydrogen characteristic absorption peak of unsaturated alkenyl group, the characteristic absorption peak at 1752cm -1 belongs to the carbon-oxygen double bond characteristic absorption peak of ester group, and the characteristic absorption peak at 1064cm -1 belongs to the carbon-oxygen characteristic absorption peak of ether bond.

[0056] Comparative example 1

[0057] A water-based UV primer for floor, comprising the following raw materials in parts by weight:

[0058] Water-based UV polyurethane emulsion 80 parts, photoinitiator 1173 2 parts, jute fiber 4.5 parts, defoaming agent 1 part, thickening agent 0.6 part, wetting dispersant 0.2 part, pigment 6 parts, leveling agent 0.8 part, film-forming aid 2 parts;

[0059] The preparation method of the water-based UV primer comprises the following steps:

[0060] First step, the water-based UV polyurethane emulsion, defoaming agent, thickening agent, wetting dispersant and leveling agent are added to a high-speed stirrer, the rotating speed is controlled at 400r / min, and mechanical stirring is mixed for 15min to form a premix;

[0061] Second step, under the condition of stirring, add the photoinitiator, jute fiber, pigment and film forming aid into the premix, after adding, adjust the speed to 1500r / min, continue to stir for 30min, then stop stirring, discharge, and it is ready.

[0062] Comparative example 2

[0063] A water-based UV primer for floor, comprising the following raw materials in parts by weight:

[0064] Water-based UV polyurethane emulsion 80 parts, photoinitiator 1173 2 parts, defoaming agent 1 part, thickening agent 0.6 parts, wet dispersing agent 0.2 parts, pigment 6 parts, leveling agent 0.8 parts, film forming aid 2 parts;

[0065] The preparation method of the water-based UV primer comprises the following steps:

[0066] First step, add the water-based UV polyurethane emulsion, defoaming agent, thickening agent, wet dispersing agent and leveling agent into the high-speed stirrer, control the speed to 400r / min, mechanically stir and mix for 15min to form a premix;

[0067] Second step, under the condition of stirring, add the photoinitiator, pigment and film forming aid into the premix, after adding, adjust the speed to 1500r / min, continue to stir for 30min, then stop stirring, discharge, and it is ready.

[0068] Test example

[0069] Mix the primer in the examples and comparative examples with water in a volume ratio of 10:1, after stirring evenly, coat it on the surface of the wooden floor, then dry at a temperature of 50℃ for 1h, then use a 300mj / cm 2 UV light source to irradiate and cure to form a film, and make a sample to be tested;

[0070] According to standard GB / T 1720-1989, test the adhesion;

[0071] According to standard GB / T 1731-2020, test the flexibility;

[0072] The results are shown in the following table:

[0073]

[0074]

[0075] The principles and implementations of the present application are described herein with specific examples, and the above examples are only used to help understand the method of the present application and its core idea, including the best mode, and also enable any person skilled in the art to practice the present application, including manufacturing and using any device or system, and implementing any combined method. It should be noted that, for those skilled in the art, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application. The scope of patent protection of the present application is defined by the claims, and can include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements similar to the literal expression of the claims, or if they include equivalent structural elements that are not substantially different from the literal expression of the claims, then these other embodiments should also be included within the scope of the claims.

[0076] The above examples are only used to illustrate the technical solutions of the present application, and not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent substitutions for part of the technical features; and these modifications or substitutions will not cause the essence of the corresponding technical solution to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A water-based UV primer for flooring, characterized in that, Including the following raw materials by weight: The composition comprises 75-95 parts of waterborne UV polyurethane emulsion, 1-3 parts of photoinitiator, 3-5 parts of modified jute fiber, 0.5-1.5 parts of defoamer, 0.5-1 part of thickener, 0.1-0.5 parts of wetting and dispersing agent, 5-10 parts of pigment, 0.5-1 part of leveling agent, and 1-3 parts of film-forming aid; the preparation method of the modified jute fiber is as follows: Step S1: Under the action of a catalyst, pretreated jute fibers are modified with halogenated isocyanates to obtain halogenated jute fibers. Step S2: In N,N-dimethylformamide medium, using polyether diol as a bridging agent, under the action of alkaline hydroxide aqueous solution, the halogenated jute fiber is first further modified, and then a chain extender is added to carry out chain extension polymerization to obtain modified jute fiber. The chain extender is prepared by using pentaerythritol triallyl ether and 3-bromo-2-bromomethylpropionic acid as reactants, and carrying out a condensation reaction under the combined action of an accelerator and a condensing agent.

2. The water-based UV primer for flooring according to claim 1, characterized in that, The photoinitiator is at least one of photoinitiator 1173, photoinitiator 184, or photoinitiator TPO.

3. The water-based UV primer for flooring according to claim 1, characterized in that, The catalyst is any one of dibutyltin dilaurate, dibutyltin diacetate, or stannous octoate.

4. The water-based UV primer for flooring according to claim 1, characterized in that, The haloisocyanate is chloroethyl isocyanate or 3-chloropropyl isocyanate.

5. The water-based UV primer for flooring according to claim 1, characterized in that, The specific method for the preprocessing is as follows: Add jute fiber to a 10-20% sodium hydroxide aqueous solution, stir and mix evenly, then raise the temperature to 60-70℃, soak for 3-6 hours, remove, wash and dry.

6. The water-based UV primer for flooring according to claim 1, characterized in that, The accelerator is 4-dimethylaminopyridine or N-hydroxysuccinimide; the condensing agent is dicyclohexylcarbodiimide or 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide.

7. A water-based UV primer for flooring according to claim 1, characterized in that, The alkaline hydroxide aqueous solution is a potassium hydroxide aqueous solution or a sodium hydroxide aqueous solution, with a mass fraction of 20-30%.

8. A method for preparing a water-based UV primer for flooring as described in claim 1, characterized in that, Includes the following steps: Step 1: Add the water-based UV polyurethane emulsion, defoamer, thickener, wetting and dispersing agent and leveling agent to a high-speed mixer, control the speed to 300-500 r / min, and mechanically mix for 10-15 min to form a premix. The second step is to add the photoinitiator, modified jute fiber, pigment, and film-forming aid to the premix under stirring conditions. After the addition is complete, adjust the speed to 1000-2000 r / min and continue stirring for 20-40 minutes. Then stop stirring and discharge the material.

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