CN111849295A

CN111849295A - Substrate coloring agent and preparation method thereof

Info

Publication number: CN111849295A
Application number: CN202010815259.7A
Authority: CN
Inventors: 朱杰; 周桐
Original assignee: Guangdong Libang Changrunfa Science And Technology Material Co ltd
Current assignee: Guangdong Libang Changrunfa Science And Technology Material Co ltd
Priority date: 2020-08-14
Filing date: 2020-08-14
Publication date: 2020-10-30

Abstract

The invention provides a base material coloring agent, which comprises a main component and a matched color paste, wherein the main component and the matched color paste are mixed according to the weight ratio of 100: (5-30) mixing; the main component comprises the following components in percentage by weight: 10-50% of water-based acrylic emulsion, 0.2-0.5% of pH regulator, 0.3-0.5% of wetting agent, 0.2-0.5% of defoaming agent, 2-5% of film-forming assistant, 5-40% of slow drying agent, 5-20% of deionized water, 0.1-0.3% of mildew preventive and 0.3-0.5% of bentonite. The substrate wiping agent uses the multilayer core-shell structure water-based acrylic emulsion as the main resin and is matched with other auxiliary agents, so that a paint film has excellent wiping property and coloring property, and the wiping agent can achieve good packaging effect and color naturalness without spraying water-based sealing primer. The invention also provides a preparation method of the substrate wiping agent.

Description

Substrate coloring agent and preparation method thereof

Technical Field

The invention relates to the technical field of paint production, in particular to a water-based substrate color wiping agent and a preparation method thereof.

Background

Along with the implementation of environmental protection policies in various regions, people have stronger awareness of green environmental protection coating, and the water-based household coating is an application trend of products.

The wiping agent is mainly used for coating products for coloring base materials, and in the existing market, the products of the water-based bottom water-based surface and the UV bottom water-based surface are frequently wiped by Grice when a transparent coloring process is carried out, and the operation process of water-based coloring is water-based closed bottom-water-based Grice-water-based transparent bottom-water-based finish paint; and (3) UV process: water soluble glaze-UV base-UV topcoat (water-based topcoat). In the above process: the problems of poor glaze wiping property and uneven coloring commonly exist in the water-based process; the biggest problem of the UV process is that when the solid wood is spliced, local color eating and color bleeding are easily caused due to different wood quality, and the whole color is different, so that the coating attractiveness is seriously influenced; and meanwhile, the interlayer adhesion with the UV bottom is poor.

Chinese patent with publication number CN104046240A discloses a water-based color wiping glaze base material, which is prepared from the following components in percentage by weight: the water-based paint comprises, by weight, 10-15% of water-based resin A, 5-10% of water-based resin B, 1-3% of a dispersant, 0.1-0.3% of a mildew inhibitor, 0.5-1% of a thickener, 15-25% of a filler, 25-45% of an alcohol ether solvent, 0.1-0.5% of a defoaming agent, 0.5-1.5% of a pH value regulator, 6-30% of color paste and the balance of water. The coloring roller coater for the water-based wiping glaze base material is used for coloring the woodware, and the construction is convenient. However, the adhesion of the aqueous color-wiping glaze base material in the block of encapsulation and color bleeding is still to be verified.

Therefore, how to provide a substrate wiping agent with good adhesion and make the whole color the same is a technical problem to be solved by the technical personnel in the field.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides the substrate wiping agent, the multilayer core-shell structure water-based acrylic emulsion is used as the main resin, and other auxiliary agents are matched, so that a paint film has excellent wiping property and coloring property, and the wiping agent can achieve good packaging effect and color naturalness without spraying water-based sealing primer. The invention also provides a preparation method of the substrate wiping agent.

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

the base material coloring agent comprises a main component and a matched color paste, wherein the main component and the matched color paste are mixed according to the ratio of 100: (5-30) mixing;

the main component comprises the following components in percentage by weight:

as further description of the technical scheme of the invention, the aqueous acrylic emulsion is an aqueous acrylic emulsion with a multilayer core-shell structure, and the minimum film-forming temperature MFFT of the aqueous acrylic emulsion is between 5 and 20 ℃. The water-based acrylic emulsion with the multilayer core-shell structure has good adhesive force, film-forming property, water resistance and transparency, and the specification model preferably adopts J95 of BASF company.

The MFFT of the resin is 5-20 ℃, so that the resin has good low-temperature film-forming property, the demand of a film-forming additive is small, and the VOC value is lower; the water-based color wiping agent provided by the invention has good sealing performance due to the characteristics of the resin, can be used as a sealing primer in practical application, also has a coloring effect, can save one water-based sealing primer compared with the traditional process, saves the cost, and improves the production efficiency of customers.

The pH regulator is mainly used for increasing the pH value of the system, and the specification model preferably uses AMP-95 of DOW company.

As a further description of the solution of the invention, the wetting agent is a solution of polyether modified silane, which has the ability to strongly reduce surface tension and significantly improve substrate wetting. BYK-346 from Pico chemical is preferred for the specification model.

As further description of the technical scheme of the invention, the defoaming agent comprises any one or more of polysiloxane, aliphatic mineral oil, organic modified polysiloxane, fumed silica modified polyether siloxane or polyether siloxane. The specification models may be selected from TEGO825 and TEGO810 from Degussa, and BYK019, BYK022, and BYK024 from Pico chemical.

As a further description of the present invention, the coalescent includes at least one of dipropylene glycol butyl ether (DPnB), propylene glycol monobutyl ether (DPM), or ethylene glycol butyl ether (BG).

As a further description of the technical solution of the present invention, the slow-drying agent is at least one of propylene glycol, ethylene glycol or glycerin, and is used for adjusting the drying speed of the main agent, and the drying speed determines the wiping performance of the main agent.

As further description of the technical scheme of the invention, the main component of the mildew preventive is dichlorooctyl isothiazolinone, the solution can be prepared, the liquid mildew preventive and algae preventive agent can be used for protecting paint films and coatings, the liquid mildew preventive and algae preventive agent can be used as a high-performance preservative, the growth of surface molds can be effectively inhibited, the high-performance preservative has excellent algae preventive and antibacterial activities, and the specification and model are preferably 342 of DOW company.

As a further description of the solution of the invention, the bentonite is an organically modified hectorite clay, which mainly gives the main agent good in-can viscosity and good thixotropy in construction, and the specification model is preferably EW or DE of haimingss.

The organically modified hectorite clay acts as a thickener for the system and provides good thixotropy to the system. The common polyurethane associative thickener cannot play a thickening role in a system containing a large amount of slow-drying agent, but the organically modified hectorite clay used in the invention has high thickening efficiency on an aqueous phase and is slightly influenced by the amount of a solvent. Another advantage of the organically modified hectorite clay is that it provides good thixotropy, has low wipe resistance and good wettability during wiping, and greatly improves operability.

Preferably, the main component and the matched color paste are mixed according to the weight ratio of 100: 20, mixing;

the main component comprises the following components in percentage by weight:

the water-based wiping agent has good wiping performance and long opening time, and the wiping agent has excellent adhesive force with UV combination, so that the water-based sealing primer is not required to be sprayed by using the wiping agent, and good packaging effect and color naturalness can be achieved.

The invention also provides a preparation method of the substrate wiping agent, which comprises the following steps:

s1, adding water-based acrylic emulsion into a paint preparation cylinder, then adding a pH regulator under the stirring condition, dispersing at the speed of 600-;

s2, sequentially adding a wetting agent and a defoaming agent, and dispersing for 5 minutes at the speed of 800-;

s3, uniformly mixing the film-forming auxiliary agent, the slow-drying agent and the deionized water in advance, and slowly putting the mixture into a paint making cylinder under the stirring condition;

s4, finally slowly and sequentially putting the mildew preventive and the bentonite into a paint making cylinder, and stirring for 20 minutes at the speed of 1000-1200 r/min.

S5, mixing the main components and the matched color paste according to the ratio of 100: (5-30) and adjusting to proper construction viscosity, the wood grain color paint can be uniformly coated on wood, and excellent wood grain color effect can be obtained after drying.

The substrate wiping agent prepared by the preparation method has excellent wiping performance, particularly excellent coloring performance and erasable open time when American coating is carried out; meanwhile, the paint has good adhesive force on various substrates and has excellent adhesive force when matched with oily paint, can be used as bridging paint between UV primer and wood, gives consideration to excellent adhesive force while coloring, and greatly improves the application property of UV on wood by the two-in-one function.

Based on the technical scheme, the invention has the following technical effects:

(1) the substrate wiping agent provided by the invention selects the multilayer core-shell structure water-based acrylic emulsion as the main resin, and has good water resistance and excellent adhesive force; the MFFT of the selected resin is 5-20 ℃, so that the resin has good low-temperature film-forming property, the demand of a film-forming additive is low, and the VOC value is lower; moreover, the water-based color wiping agent can be used as a seal primer in practical application due to the good sealing property of the resin, and also has a coloring effect.

(2) The base material wiping agent uses the organic modified hectorite clay as the thickening agent, has high water phase thickening efficiency, is slightly influenced by the amount of the solvent, provides good thixotropy for a system, has the characteristics of small wiping resistance and good wettability in the wiping process, and greatly improves the operability.

(3) The base material wiping agent has good adhesive force on various base materials (base materials), has excellent adhesive force when being matched with water paint or oil paint, has two-in-one function, and improves the application property of UV on wood. The base material wiping agent solves the problems of incapability of directly constructing with wood, poor coloring property, unbalanced bleeding property and poor wiping property in the traditional water-based wiping agent.

Detailed Description

In order that the invention may be more fully understood, reference will now be made to the specific embodiments illustrated. The invention provides a preferred embodiment. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

A substrate coloring agent comprises a main component and a matched color paste, wherein the main component and the matched color paste are mixed according to the ratio of 100: (5-30) mixing;

the main components consist of the following components in percentage by weight:

the water-based acrylic emulsion is a water-based acrylic emulsion with a multilayer core-shell structure, the minimum film forming temperature MFFT of the water-based acrylic emulsion is between 5 and 20 ℃, and the specification model is J95 of BASF company.

The pH regulator is mainly used for improving the pH value of a system, and the specification model of the pH regulator is AMP-95 of DOW company.

The wetting agent is a polyether modified silane solution, and BYK-346 of Bike chemical is preferred as a specification model.

The defoaming agent comprises one or more of polysiloxane, aliphatic mineral oil, organic modified polysiloxane, fumed silica modified polyether siloxane or polyether siloxane. The specification models may be selected from TEGO825 and TEGO810 from Degussa, and BYK019, BYK022, and BYK024 from Pico chemical.

The film forming aid comprises at least one of dipropylene glycol butyl ether (DPnB), propylene glycol monobutyl ether (DPM) or ethylene glycol butyl ether (BG).

The slow-drying agent is at least one of propylene glycol, ethylene glycol or glycerin and is used for adjusting the drying speed of the main agent, and the wiping performance of the main agent is determined by the drying speed.

The main component of the mildew preventive is dichloro octyl isothiazolinone, which can be prepared into solution, and the specification type is preferably 342 of DOW company.

The bentonite is organic modified hectorite clay, and the specification model is preferably EW or DE of Haimax.

In the actual production process, the main components are prepared according to the following components in parts by weight and proportions:

(1) the raw materials (components) of the main component, the weight portions and the mixture ratio are shown in table 1.

TABLE 1 weight parts and proportions of the main ingredient materials (components)

The preparation method of the main components comprises the following steps:

s4, finally slowly and sequentially putting the mildew preventive and the bentonite into a paint making cylinder, stirring for 20 minutes at the speed of 1000-1200r/min until the mildew preventive and the bentonite are completely and uniformly mixed, filtering and packaging.

Example 1

Mixing the main component-A and the matched color paste according to the proportion of 100: 20, and adjusted to an appropriate construction viscosity, to obtain the base material coloring agent of example 1.

Example 2

Mixing the main component-B and the matched color paste according to the ratio of 100: 15, and the mixture was adjusted to an appropriate construction viscosity, thereby obtaining the base material colorant of example 2.

Example 3

Mixing the main component-C and the matched color paste according to the ratio of 100: 25, and adjusting the mixture to a proper construction viscosity to obtain the base material coloring agent of example 3.

Example 4

Mixing the main component-C and the matched color paste according to the ratio of 100: 5, and adjusting the mixture to a proper construction viscosity, thereby obtaining the base material coloring agent of example 4.

Comparative example 1

A common aqueous wiping agent.

The substrate wiping agents of examples 1 to 4, and the ordinary aqueous wiping agent of comparative example 1 were subjected to a wiping agent application test, a wiping property comparison test, a wiping open time, an adhesion test, and a cold-hot cycle test, respectively. The specific method comprises the following steps:

(1) the aqueous substrate wipe application test method is as follows:

and (3) contrasting the wetting property, preparing two solid wood spliced boards, such as fraxinus mandshurica, black walnut and the like, paying attention to selecting boards with consistent wood grains, sanding and flattening by using No. 240 abrasive paper, pouring a proper amount of the colored common water-based wiping agent of the comparative example 1 and the base material wiping agents of the examples 1-4 into the boards simultaneously, and then wiping and coating by uniformly drawing circles with rags, wherein the coloring effect of the guide pipe of the wood is contrasted, and the coloring uniformity of the guide pipe represents that the wetting property is good.

(2) Comparative test method for wiping properties: according to the application test method of the water-based substrate wiping agent, the wood is uniformly wiped, the hand feels the resistance of wiping, and the resistance with better wiping performance is smaller.

(3) Open time for rub-off: according to the application test method of the water-based substrate wiping agent, the wood is wiped uniformly, then the wood is dried for 3min, 5min, 8min and 10min at normal temperature respectively, the residual wiping agent on the surface is collected completely by using a rag when the corresponding time period is reached, the surface color wiping represents short open time, and the open time is required to reach 5-10min according to the actual operation requirement.

(4) And (3) testing the adhesive force: baking the color wiping agent at 30-35 ℃ for 20-30min, spraying a water-based transparent primer and a UV (ultraviolet) primer, and measuring the adhesive force of the water-based primer after the water-based primer is dried for 3 days, wherein the Baige is more than 1 grade; the UV bottom can be tested by cooling for 20min after passing the lamp, and the hundred lattices should be more than 1 grade.

(5) And (3) cold-hot cycle testing: and (3) placing the primer plate manufactured according to the adhesion testing process into a cold-hot circulation experiment machine, setting the temperature to be minus 20-60 ℃, keeping the temperature constant at a low temperature for 2 hours, keeping the temperature constant at a high temperature for 2 hours, testing for 10 cycles, then taking out, comparing whether the adhesion is poor, observing whether the transparency is poor, whether the adhesion is mildewed and the like.

The substrate wiping agents of examples 1 to 4, and the ordinary aqueous wiping agent of comparative example 1 were examined. The test results are shown in Table 2.

Table 3 results of performance test of the substrate colorants of examples 1 to 4, comparative example 1

As can be seen from table 2, the substrate wiping agents of examples 1 to 4 have excellent performances in terms of fineness, storage stability, adhesion, wiping property, open time and the like, and the open time of the substrate wiping agents of examples 1 to 4 is significantly longer than that of the common aqueous wiping agent of comparative example 1 in terms of the detection value of the open time, and also has great advantages in terms of the test result of the adhesion.

Therefore, the substrate wiping agents provided in examples 1 to 4 have good adhesion on various substrates (substrates), excellent adhesion when matched with other paints, and two-in-one function, improve the application property of UV on wood, and solve the problems of poor colorability, unbalanced bleeding property and poor wiping property of the traditional water-based wiping agents, which cannot be directly applied to wood.

The foregoing is merely exemplary and illustrative of the structures of the present invention, which are described in some detail and detail, and are not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications are possible without departing from the inventive concept, and such obvious alternatives fall within the scope of the invention.

Claims

1. The base material wiping agent is characterized by comprising a main component and a matched color paste, wherein the main component and the matched color paste are mixed according to the weight ratio of 100: (5-30) mixing;

the main component comprises the following components in percentage by weight:

2. the substrate wipe according to claim 1, wherein the aqueous acrylic emulsion is an aqueous acrylic emulsion having a multi-layer core-shell structure and a minimum film forming temperature MFFT of between 5 ℃ and 20 ℃.

3. The substrate wipe of claim 1 wherein the wetting agent is a polyether modified silane solution.

4. The substrate wipe of claim 1 wherein the defoamer comprises any one or more of a polysiloxane, an aliphatic mineral oil, an organo-modified polysiloxane, a fumed silica modified polyether siloxane, or a polyether siloxane.

5. The substrate wipe of claim 1 wherein the coalescing agent includes at least one of dipropylene glycol butyl ether, propylene glycol monobutyl ether, or ethylene glycol butyl ether.

6. The substrate wipe of claim 1 wherein the slow drying agent is at least one of propylene glycol, ethylene glycol, or glycerin.

7. The substrate wipe of claim 1 wherein the mildewcide has dichlorooctyl isothiazolinone as a major component and the bentonite clay is an organically modified hectorite clay.

8. The substrate colorant according to claim 1, wherein the main component and the color paste are mixed in a ratio of 100: 20, mixing;

the main component comprises the following components in percentage by weight:

9. a method of producing a substrate wipe according to any of claims 1-8, characterized in that it is produced by the steps of:

s4, finally slowly and sequentially putting the mildew preventive and the bentonite into a paint making cylinder, and stirring for 20 minutes at the speed of 1000-1200r/min to obtain a main component;

s5, mixing the main components and the matched color paste according to the ratio of 100: (5-30) and adjusted to an appropriate working viscosity.