CN114213918A - Water-based wood clear primer and preparation method thereof - Google Patents

Water-based wood clear primer and preparation method thereof Download PDF

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Publication number
CN114213918A
CN114213918A CN202111618285.1A CN202111618285A CN114213918A CN 114213918 A CN114213918 A CN 114213918A CN 202111618285 A CN202111618285 A CN 202111618285A CN 114213918 A CN114213918 A CN 114213918A
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China
Prior art keywords
water
clear primer
agent
polyurethane
defoaming agent
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CN202111618285.1A
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李艳宁
陈寿生
罗先平
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Puyang Zhanchen New Material Co ltd
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Puyang Zhanchen New Material Co ltd
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Priority to CN202111618285.1A priority Critical patent/CN114213918A/en
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00Properties
    • C08L2201/10Transparent films; Clear coatings; Transparent materials

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention provides a water-based wood clear primer and a preparation method thereof, wherein the clear primer comprises the following components in percentage by weight: 40-50% of water-based acrylic resin, 30-40% of water-based polyurethane resin, 4-5% of film-forming additive, 0.8-1.2% of defoaming agent, 0.5-1% of wetting agent, 0.5-1% of thickening agent and 10-15% of water. The water-based wood clear primer coating provided by the invention has excellent sanding property, good powder output, no adhesion of sand paper and excellent transparency, the resistance of a paint film is tested according to GB/T23999-.

Description

Water-based wood clear primer and preparation method thereof
Technical Field
The invention belongs to the field of coatings, and particularly relates to a water-based wood clear primer and a preparation method thereof.
Background
With the enhancement of the awareness of the environmental protection of human beings, the limited emission standard is becoming stricter, and the promotion and the use of new products which are green, environment-friendly, energy-saving and emission-reducing are encouraged. Therefore, in the field of coating, development and application of safe and environment-friendly water-based, powder, high-solid and other environment-friendly coatings are imperative.
The demand for changing oil into water is higher and higher, GB18581-2020 has clear requirements on the VOC content of the coating, and different areas have clear requirements on the VOC emission of coating using enterprises. Water-based paints are receiving attention as an environmentally friendly coating. Modern labor cost is increasingly high, the polishing performance of the existing water-based clear primer is poor, sand paper is easy to stick, labor is wasted, sand paper is wasted, and labor efficiency is low. Because the common water-based clear primer is mostly made of acrylic emulsion, the glass transition temperature is low, heat is easily generated during polishing, and the acrylic emulsion is easily softened when being heated, so that sand paper is adhered during polishing. Some use acrylic emulsions which crosslink by themselves, but after all, the degree of crosslinking is low and the improvement is small. If a high Tg acrylic emulsion is used, the amount of film-forming aid needs to be multiplied, resulting in slow drying and high VOC content.
Disclosure of Invention
The invention aims to provide a water-based wood clear primer and a preparation method thereof, in particular to the preparation of the water-based wood clear primer which is high in transparency, easy to polish and excellent in resistance.
In order to achieve the purpose of the invention, in a first aspect, the invention provides a water-based wood clear primer, which comprises the following components in percentage by weight:
Figure BDA0003437179300000011
the sum of the weight percentages of the components is 100 percent.
The water-based acrylic resin is self-crosslinking emulsion with a core-shell structure, the glass transition temperature is 30-40 ℃, and the solid content is 40-50%. The glass transition temperature of the waterborne polyurethane resin is 60-70 ℃, and the solid content is 30-40%. Such as Lacper 4501, which is an aqueous polyurethane resin product of Wanhua chemical group, Inc.
Further, the water-based polyurethane resin is polyurethane modified acrylate, and is resin containing vegetable oil and having a core-shell structure, wherein the polyurethane part contains a vegetable oil structure, and the glass transition temperature of the acrylic acid part is 100-110 ℃. Such as Lacper 4101, Lacper 4219, etc., which are urethane-modified acrylate products of Wanhua chemical group, Inc.
Preferably, the water-based wood clear primer comprises the following components in percentage by weight:
Figure BDA0003437179300000021
preferably, the film-forming aid is an alcohol ether solvent with film-forming properties. Such as DPM and/or DPNB by DOW chemical company (usa).
Preferably, the defoaming agent is an acetylene glycol defoaming agent and/or a polyether modified siloxane defoaming agent. Wherein, the acetylene glycol defoaming agent belongs to a molecular defoaming agent, and the content of effective components is 50-100%. The effective component content of the polyether modified siloxane defoamer is 30-100%. Such as Surfynol104E from Shanghai Special chemistry, Inc., Greesol A04 from Kaimen (Yueyang) waterborne auxiliary agent, Inc., BYK024, TEGO Foamex 810, TEGO Airex 902W, etc.
Preferably, the wetting agent is polyether modified polydimethylsiloxane, is nonionic, and has an effective component content of 50-100%. Such as BYK349, BYK346, TWIN 4100 of Digao, Germany, or a mixture of more than one of them.
Preferably, the thickener is polyether modified polyurethane associative thickener, and the content of effective components is 25-50%. Such as RHEOLATE 299, RHEOLATE 1010 and RHEOLATE 350D of Haimines New materials science and technology, Inc. (Jiangsu).
In a second aspect, the invention provides a preparation method of the water-based wood clear primer, which comprises the following steps: weighing the components in proportion, mixing the water-based acrylic resin with the water-based polyurethane resin, dispersing at a medium speed of 700-900 rpm for 5-10 min, sequentially adding the defoaming agent, the wetting agent and the film forming aid, dispersing at a high speed of 1000-1200 rpm for 15-25 min until no shrinkage cavity exists, finally adding the thickening agent and water, and dispersing at a medium speed of 700-900 rpm until the standard viscosity (25 ℃) is 75-80 KU.
By the technical scheme, the invention at least has the following advantages and beneficial effects:
the water-based woodware clear primer coating provided by the invention has excellent transparency, excellent sanding property, no sand paper sticking, good powder discharging, and resistance which is tested according to GB/T23999-. The working efficiency is improved.
According to the invention, on the basis of a self-crosslinking process, the vegetable oil modified waterborne polyurethane resin is used, so that the polishing property can be greatly improved, and meanwhile, the vegetable oil component is introduced, so that the use amount of the film-forming auxiliary agent can be effectively reduced, the VOC (volatile organic compounds) is reduced, the drying time is shortened, and the production efficiency is improved.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art, and the raw materials used are commercially available products.
The percent in the present invention means mass percent unless otherwise specified; but the percent of the solution, unless otherwise specified, refers to the grams of solute contained in 100mL of the solution.
The specific parameters of the raw materials used in the following examples are as follows:
water-based acrylic resin: the glass transition temperature is 30-40 ℃, and the solid content is 40-50%. Available from Wanhua chemical group, Inc., product number Lacper 4501.
Urethane-modified acrylate I: the glass transition temperature is 60-70 ℃, and the solid content is 30-40%. Available from Wanhua chemical group, Inc., product number Lacper 4101.
Urethane-modified acrylate II: the glass transition temperature is 60-70 ℃, the solid content is 30-40%, and the product is purchased from Wanhua chemical group Limited company, product model Lacper 4219.
Film-forming aid (alcohol ether solvent with film-forming property): DPM and DPNB are mixed according to the mass ratio of 1: 1. From DOW chemical company (DOW) usa.
Wetting agent: the polyether modified polydimethylsiloxane had an active ingredient of 52% and was purchased from BYK346, Bick, Germany.
Defoaming agent: polyether modified siloxane copolymer emulsion, 100% active ingredient, containing fumed silica, was purchased from Airex 902W, Digao (Tego).
Thickener (polyether-modified polyurethane associative thickener): belongs to the compound of a high shear thickening agent and a low shear thickening agent, is purchased from RHEOLATE 350D and RHEOLATE 299 of New Material science and technology Limited of Jiangsu Haiming, and is mixed and used according to the mass ratio of 1: 1.
Example 1 preparation of aqueous woodenware clear primer
The embodiment provides a water-based woodware clear primer coating, which comprises the following components in percentage by weight (the sum of the total weight percentage is 100%): 50% of water-based acrylic resin; 30% of polyurethane modified acrylate I; 0.5 percent of defoaming agent; 0.8% of wetting agent; 4% of film forming auxiliary agent; 0.5% of thickening agent; the balance being water.
The preparation method comprises the following steps: firstly weighing the components according to the weight percentage, then mixing the water-based acrylic resin and the polyurethane modified acrylate which are weighed and weighed, dispersing at a medium speed of 700-900 rpm for 5-10 min, sequentially adding the defoaming agent, the wetting agent and the film forming additive, dispersing at a high speed of 1000-1200 rpm for 15-25 min until no shrinkage cavity exists, finally adding the thickening agent and water, and dispersing at a medium speed of 700-900 rpm until the standard viscosity is 75-80 KU/25 ℃.
Example 2 preparation of aqueous woodenware clear primer
The embodiment provides a water-based woodware clear primer coating, which comprises the following components in percentage by weight (the sum of the total weight percentage is 100%): 60% of water-based acrylic resin; 20% of polyurethane modified acrylate I; 0.5 percent of defoaming agent; 0.8% of wetting agent; 4% of film forming auxiliary agent; 0.5% of thickening agent; the balance being water.
Example 3 preparation of aqueous woodenware clear primer
The embodiment provides a water-based woodware clear primer coating, which comprises the following components in percentage by weight (the sum of the total weight percentage is 100%): 40% of water-based acrylic resin; 40% of polyurethane modified acrylate I; 0.5 percent of defoaming agent; 0.8% of wetting agent; 3% of film forming auxiliary agent; 0.5% of thickening agent; the balance being water.
Example 4 preparation of aqueous woodenware clear primer
The embodiment provides a water-based woodware clear primer coating, which comprises the following components in percentage by weight (the sum of the total weight percentage is 100%): 40% of water-based acrylic resin; 40% of polyurethane modified acrylate II; 0.5 percent of defoaming agent; 0.8% of wetting agent; 4% of film forming auxiliary agent; 0.5% of thickening agent; the balance being water.
Examples 2-4 the preparation method of the aqueous clear primer for woodware is the same as example 1.
Test example:
the water-based woodware clear primer coating prepared in the embodiments 1 to 4 is subjected to performance tests such as transparency, sanding property and resistance. The test method is carried out according to GB/T23999-. The VOC calculation method is carried out by referring to 10.3 in GB/T23986-2009.
The results of the resistance index test for each example coating are shown in table 1:
TABLE 1 test results for resistance index
Example 1 Example 2 Example 3 Example 4
Water-resistant 2 2 3 2
Acid resistance 2 2 2 2
Alkali resistance 2 2 1 2
Alcohol resistance 3 3 3 3
Stain resistance 2 2 2 2
Salt tolerance 1 1 1 1
Hot water resistant 2 2 3 2
Transparency of 2 3 1 2
Sanding property 2 2 1 2
VOC(g/mL) 110 135 86 115
The results show that the clear primer coating prepared in the embodiments 1-4 has better transparency and better sanding property than other schemes in the embodiment 3. The aqueous polyurethane resin without the special vegetable oil modification used in example 4 and the aqueous polyurethane resin with the vegetable oil modification used in example 3 have a significantly improved sanding property due to the special vegetable oil structure. Meanwhile, due to the vegetable oil structure, the wetting and warm color and the hole-entering performance of the wood are obviously improved. The transparency and the fullness of the paint film are also greatly improved. Compared with the common water-based primer which is added with zinc stearate as a polishing auxiliary agent and improves the polishing property in the market, the water-based primer has high transparency, and the polishing property is better than that of the water-based primer which is added with the polishing auxiliary agent and has the same transparency.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (9)

1. The water-based wood clear primer is characterized by comprising the following components in percentage by weight:
Figure FDA0003437179290000011
the water-based acrylic resin is self-crosslinking emulsion with a core-shell structure, the glass transition temperature is 30-40 ℃, and the solid content is 40-50%;
the glass transition temperature of the waterborne polyurethane resin is 60-70 ℃, and the solid content is 30-40%.
2. The clear primer according to claim 1, wherein the aqueous polyurethane resin is polyurethane modified acrylate, and is a resin with a core-shell structure and containing vegetable oil, wherein the polyurethane part contains a vegetable oil structure, and the glass transition temperature of the acrylic part is 100-110 ℃.
3. The clear primer according to claim 2, which comprises the following components in percentage by weight:
Figure FDA0003437179290000012
4. the clear primer according to any one of claims 1 to 3, wherein the film forming aid is an alcohol ether solvent with film forming property;
the defoaming agent is an acetylene glycol defoaming agent and/or a polyether modified siloxane defoaming agent;
the wetting agent is polyether modified polydimethylsiloxane;
the thickener is polyether modified polyurethane associative thickener.
5. The clearcoat of claim 4, wherein the coalescent is DPM and/or DPNB from Dow chemical company, USA.
6. The clearcoat of claim 4, wherein the defoamer is one or more of Surfynol104E, Greesol A04, BYK024, TEGO Foamex 810, and TEGO Airex 902W, which are derived from Special Chemicals, Inc.
7. The clear primer according to claim 4, wherein the wetting agent is one or more of BYK349, BYK346 and TWIN 4100 of Digao.
8. The clearcoat of claim 4 wherein said thickener is a mixture of two or more of rheelate 299, rheelate 1010 and rheelate 350D from hamming corporation, usa.
9. A method of preparing a clear primer according to any one of claims 1 to 8, characterized in that the method comprises: weighing the components in proportion, mixing the water-based acrylic resin with the water-based polyurethane resin, dispersing at a medium speed of 700-900 rpm for 5-10 min, sequentially adding the defoaming agent, the wetting agent and the film forming aid, dispersing at a high speed of 1000-1200 rpm for 15-25 min until no shrinkage cavity exists, finally adding the thickening agent and water, and dispersing at a medium speed of 700-900 rpm until the standard viscosity is 75-80 KU.
CN202111618285.1A 2021-12-27 2021-12-27 Water-based wood clear primer and preparation method thereof Pending CN114213918A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115895362A (en) * 2022-11-24 2023-04-04 中华制漆(新丰)有限公司 High-adhesion water-based wood paint and preparation method thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110256952A (en) * 2019-06-27 2019-09-20 东莞大宝化工制品有限公司 A kind of quick-drying is exempted to toast clear priming paint of aqueous wooden ware and preparation method thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110256952A (en) * 2019-06-27 2019-09-20 东莞大宝化工制品有限公司 A kind of quick-drying is exempted to toast clear priming paint of aqueous wooden ware and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
纪学顺等: "植物油改性水性聚氨酯的合成与应用研究", 《中国涂料》, vol. 32, no. 05, 30 May 2017 (2017-05-30), pages 11 - 15 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115895362A (en) * 2022-11-24 2023-04-04 中华制漆(新丰)有限公司 High-adhesion water-based wood paint and preparation method thereof
CN115895362B (en) * 2022-11-24 2024-03-15 中华制漆(新丰)有限公司 High-adhesion water-based wood paint and preparation method thereof

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