Rose essential oil water-based bi-component electrostatic spraying varnish finish paint and preparation method thereof

Abstract

The invention discloses rose essential oil water-based bi-component electrostatic spraying varnish finish paint and a preparation method thereof. The rose essential oil water-based bi-component electrostatic spraying varnish finish paint comprises a component A and a component B, 40 to 50 parts by weight of a water-based hydroxyl polyurethane emulsion; 0.5-1 part by weight of a dispersant; 0.5 to 0.8 part by weight of a defoaming agent; 0.1 to 0.3 part by weight of a wetting agent; 1-2 parts by weight of an essential oil slow-release agent; 3-5 parts by weight of rose essential oil; the component B is prepared from the following components in parts by weight: 10 to 15 parts of polyisocyanate; and 2-10 parts by weight of a coalescing agent. According to the invention, a part of essential oil can be adsorbed and temporarily locked by adopting the high specific surface area of the nanoporous material, and the PNIPAM can generate phase change under a certain condition. When the environment temperature rises, the PNIPAM is subjected to phase change and inhibits the rose essential oil from being released from pore channels. The mesoporous silica particles and the PNIPAM high polymer material are compounded and uniformly dispersed in a coating system, and the slow-release agent can effectively regulate the release of essential oil and prolong the lasting time of fragrance.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, in particular to a rose essential oil water-based two-component electrostatic spray varnish topcoat and a preparation method thereof. Background Art

[0002] With the development of coating technology, water-based coatings, as an environmentally friendly material, have gradually attracted widespread attention and application due to their advantages such as low VOC (volatile organic compound) emissions, non-toxicity, and easy operation. As an important branch, water-based two-component coating systems are usually composed of resins, curing agents, pigments, additives, etc. Rose essential oil is often added to certain coatings due to its unique aroma and excellent biological activity to improve the functionality and added value of the coating. In addition to giving the coating aromatic functions, rose essential oil also has antioxidant and antibacterial properties, making it suitable for the development of high-end coatings.

[0003] However, due to the good sealing property of the varnish topcoat, it is a challenge to control the volatilization rate of rose essential oil to achieve sustained release. Too fast volatilization will cause the essential oil to be quickly exhausted, while too slow volatilization may not meet the expected effect. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides a rose essential oil water-based two-component electrostatic spray varnish topcoat and a preparation method thereof, which solves the problems raised in the above-mentioned background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A rose essential oil water-based two-component electrostatic spray varnish topcoat, the rose essential oil water-based two-component electrostatic spray varnish topcoat comprising component A and component B;

[0009] Component A:

[0010] Aqueous hydroxy polyurethane emulsion: 40-50 parts by weight;

[0011] Dispersant: 0.5-1 parts by weight;

[0012] Defoaming agent: 0.5-0.8 parts by weight;

[0013] Wetting agent: 0.1-0.3 parts by weight;

[0014] Essential oil sustained-release agent: 1-2 parts by weight;

[0015] Rose essential oil: 3-5 parts by weight;

[0016] Deionized water: 20-25 parts by weight;

[0017] Component B:

[0018] Isocyanate curing agent: 20-40 parts by weight;

[0019] Film-forming aid: 3-5 parts by weight;

[0020] Deionized water 50-60 parts by weight.

[0021] The essential oil sustained-release agent is a mixture of mesoporous silicon dioxide and poly N-isopropylacrylamide.

[0022] The hydroxyl content in the aqueous hydroxyl polyurethane emulsion is 1.5% to 6.5%.

[0023] The solid content of the aqueous hydroxyl polyurethane emulsion is 30-40wt%, and the viscosity at 25 degrees Celsius is 1000-10000mPa·s;

[0024] The isocyanate curing comprises:

[0025] HDI trimer 10-20 parts by weight

[0026] Isophorone diisocyanate 5-10 parts by weight

[0027] 5-10 parts by weight of dicyclohexylmethane diisocyanate.

[0028] A method for preparing a rose essential oil water-based two-component electrostatic spray varnish topcoat, wherein the rose essential oil water-based two-component electrostatic spray varnish topcoat comprises a component A and a component B;

[0029] Component A:

[0030] Aqueous hydroxy polyurethane emulsion: 40-50 parts by weight;

[0031] Dispersant: 0.5-1 parts by weight;

[0032] Defoaming agent: 0.5-0.8 parts by weight;

[0033] Wetting agent: 0.1-0.3 parts by weight;

[0034] Essential oil sustained-release agent: 1-2 parts by weight;

[0035] Rose essential oil: 3-5 parts by weight;

[0036] Deionized water: 20-25 parts by weight;

[0037] Component B:

[0038] Isocyanate curing agent: 20-40 parts by weight;

[0039] Film-forming aid: 3-5 parts by weight;

[0040] Deionized water 50-60 parts by weight;

[0041] Mix components A and B evenly and package them separately to obtain rose essential oil water-based two-component electrostatic spray varnish topcoat

[0042] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0043] The present invention uses the high specific surface area of ​​the nanoporous material to adsorb and temporarily lock a portion of the essential oil, and PNIPAM will undergo a phase change under certain conditions. When the ambient temperature rises, PNIPAM will undergo a phase change and inhibit the release of rose essential oil from the pores. The mesoporous silica particles are compounded with the PNIPAM polymer material and uniformly dispersed in the coating system. The sustained-release agent can effectively regulate the release of the essential oil and prolong the duration of the aroma. DETAILED DESCRIPTION

[0044] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the following examples and comparative examples:

[0046] Hydroxyl-containing waterborne polyurethane dispersion:

[0047] Covestro's Bayhydrol UH 2592 has a hydroxyl content of 2.1%, a solid content of 45%, and a viscosity of 500 mPa·s.

[0048] HDI trimer VPLS2151 (Covestro)

[0049] IPDI (isophorone diisocyanate) T 1890 (Evonik)

[0050] Dicyclohexylmethane diisocyanate: Desmodur W H12MDI

[0051] Mesoporous silica Mesoporous Silica Nanoparticles (MSNs);

[0052] Preparation process steps of essential oil sustained-release agent:

[0053] 100 parts by weight of mesoporous silica are dispersed in 400 parts by weight of ethanol and subjected to ultrasonic treatment for 15 minutes; 20 parts by weight of polyethylene glycol modifier is added to impart hydrophilic or lipophilic groups to the surface of the particles, and the ethanol is removed by a rotary evaporator to obtain modified mesoporous silica particles;

[0054] 100 parts by weight of N-isopropylacrylamide monomer was weighed and dissolved in 400 parts by weight of deionized water, and stirred evenly. The pH of the solution was adjusted to 7 to ensure that the monomer was fully dissolved, thereby obtaining a NIPAM solution.

[0055] Add 10 parts by weight of cross-linking agent N,N'-methylenebisacrylamide to 100 parts by weight of NIPAM solution, stir to make it uniformly dispersed, add 0.5 parts by weight of initiator to the above system at room temperature; continue to add 5 parts by weight of modified mesoporous silica particles, use an ultrasonic processor to treat for -60 minutes to ensure that the particles are uniformly dispersed in the solution;

[0056] Under stirring conditions, the solution was heated to 35°C, the temperature was maintained, and stirring was continued to initiate a polymerization reaction, and the polymerization was carried out for 6 hours. During the polymerization, the gelation process was tested by sampling. When the reaction was completed, a small amount of ethanol was added to terminate the polymerization reaction, and the polymer was separated from the unreacted monomer by a vacuum filtration device; the product was washed alternately with a large amount of deionized water and ethanol for 5 times, and after each washing, it was separated by vacuum filtration or centrifugation to obtain a purified PNIPAM-mesoporous particle composite material;

[0057] The purified PNIPAM-mesoporous particle composite material was placed in a vacuum drying oven and dried at 50° C. to a constant weight to obtain a PNIPAM-mesoporous particle composite material.

[0058] The topcoat formula is as follows:

[0059] Component A:

[0060] Water-based hydroxy polyurethane emulsion: 40 parts by weight;

[0061] Dispersant: 0.5 parts by weight;

[0062] Defoaming agent: 0.8 parts by weight;

[0063] Wetting agent: 0.1 parts by weight;

[0064] Essential oil sustained-release agent: 1-2 parts by weight;

[0065] Rose essential oil: 3-5 parts by weight;

[0066] Deionized water: 25 parts by weight;

[0067] Component B:

[0068] Isocyanate curing agent: 40 parts by weight;

[0069] Propylene glycol butyl ether: 5 parts by weight;

[0070] 50 parts by weight of deionized water.

[0071] Experimental process:

[0072] Rose essential oil release analysis

[0073] According to the above-mentioned embodiments and comparative examples, a microcapsule topcoat was prepared, and the microcapsule topcoat was coated on a substrate. After curing, the substrate was placed in a water bath container and maintained at 37 degrees Celsius (25 degrees Celsius for comparison).

[0074] After 48 hours, a certain volume of release medium was extracted using a sampler. The extracted release medium was placed in a clean 500 ml sample bottle and marked. The release medium in the sample bottle was analyzed using gas chromatography-mass spectrometry (GC-MS) to calculate the rose essential oil content in the sample bottle.

[0075] Comparative Example 1

[0076] Same as Example 1, but without adding PNIPAM-mesoporous particle composite material.

[0077] Comparative Example 2

[0078] Same as Example 1, but adding the same weight portion of mesoporous silica to replace the PNIPAM-mesoporous particle composite material.

[0079] Comparative Example 3

[0080] Same as Example 1, but adding the same weight portion of modified mesoporous silica particles to replace the PNIPAM-mesoporous particle composite material.

[0081] Comparative Example 4

[0082] The same as Example 1, but 0.5 parts by weight of the modified mesoporous silica particles and 1 part by weight of the PNIPAM composite material were added to replace the PNIPAM-mesoporous particle composite material.

[0083]

[0084] It can be seen that the PNIPAM-mesoporous particle composite material of the present invention can effectively control the release of essential oils.

[0085] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A rose essential oil water-based two-component electrostatic spray varnish topcoat, characterized in that: The rose essential oil water-based two-component electrostatic spray varnish topcoat comprises component A and component B; Component A: Aqueous hydroxy polyurethane emulsion: 40-50 parts by weight; Dispersant: 0.5-1 parts by weight; Defoaming agent: 0.5-0.8 parts by weight; Wetting agent: 0.1-0.3 parts by weight; Essential oil sustained-release agent: 1-2 parts by weight; Rose essential oil: 3-5 parts by weight; Deionized water: 20-25 parts by weight; Component B: Isocyanate curing agent: 20-40 parts by weight; Film-forming aid: 3-5 parts by weight; Deionized water 50-60 parts by weight.

2. The rose essential oil water-based two-component electrostatic spray varnish topcoat according to claim 1, characterized in that: The essential oil sustained-release agent is a mixture of mesoporous silicon dioxide and poly N-isopropylacrylamide.

3. A rose essential oil water-based two-component electrostatic spray varnish topcoat according to claim 2, characterized in that: Preparation process steps of essential oil sustained-release agent: Dispersing 100 parts by weight of mesoporous silica in 300-500 parts by weight of ethanol, and ultrasonically treating for 15-30 minutes; adding 10-30 parts by weight of polyethylene glycol modifier to impart hydrophilic or lipophilic groups to the particle surface, and removing the ethanol by rotary evaporator to obtain modified mesoporous silica particles; Weigh 100 parts by weight of N-isopropylacrylamide monomer, dissolve it in 200-400 parts by weight of deionized water, stir it evenly, adjust the pH of the solution to 7-8 to ensure that the monomer is fully dissolved, and obtain a NIPAM solution. Add 1-15 parts by weight of a crosslinking agent N,N'-methylenebisacrylamide to 100 parts by weight of a NIPAM solution, stir to make it uniformly dispersed, add 0.1-2 parts by weight of an initiator to the above system at room temperature; continue to add 1-10 parts by weight of modified mesoporous silica particles, and use an ultrasonic processor to treat for 30-60 minutes to ensure that the particles are uniformly dispersed in the solution; Under stirring conditions, the solution is heated to 30-35° C., the temperature is maintained, and stirring is continued to initiate a polymerization reaction, and the polymerization takes place for 4-6 hours, during which the gelation process is tested by sampling. When the reaction is completed, a small amount of ethanol is added to terminate the polymerization reaction, and the polymer is separated from the unreacted monomer by a vacuum filtration device; the product is washed alternately with a large amount of deionized water and ethanol for 3-5 times, and after each washing, it can be separated by vacuum filtration or centrifugation to obtain a purified PNIPAM-mesoporous particle composite material; The purified PNIPAM-mesoporous particle composite material is placed in a vacuum drying oven and dried at 40-50° C. to a constant weight to obtain a PNIPAM-mesoporous particle composite material.

4. The rose essential oil water-based two-component electrostatic spray varnish topcoat according to claim 1, characterized in that: The hydroxyl content in the aqueous hydroxyl polyurethane emulsion is 1.5% to 6.5%.

5. The rose essential oil water-based two-component electrostatic spray varnish topcoat according to claim 1, characterized in that: The solid content of the aqueous hydroxyl polyurethane emulsion is 30-40 wt %, and the viscosity at 25 degrees Celsius is 1000-10000 mPa·s.

6. The rose essential oil water-based two-component electrostatic spray varnish topcoat according to claim 1, characterized in that: The isocyanate curing comprises: HDI trimer 10-20 parts by weight Isophorone diisocyanate 5-10 parts by weight 5-10 parts by weight of dicyclohexylmethane diisocyanate.

7. A method for preparing a rose essential oil water-based two-component electrostatic spray varnish topcoat, characterized in that: The rose essential oil water-based two-component electrostatic spray varnish topcoat comprises component A and component B; Component A: Aqueous hydroxy polyurethane emulsion: 40-50 parts by weight; Dispersant: 0.5-1 parts by weight; Defoaming agent: 0.5-0.8 parts by weight; Wetting agent: 0.1-0.3 parts by weight; Essential oil sustained-release agent: 1-2 parts by weight; Rose essential oil: 3-5 parts by weight; Deionized water: 20-25 parts by weight; Component B: Isocyanate curing agent: 20-40 parts by weight; Film-forming aid: 3-5 parts by weight; Deionized water 50-60 parts by weight; The A and B components are mixed evenly and packaged separately to obtain a rose essential oil water-based two-component electrostatic spray varnish topcoat.

8. The method for preparing a rose essential oil water-based two-component electrostatic spray varnish topcoat according to claim 1, characterized in that: The essential oil sustained-release agent is a PNIPAM-mesoporous particle composite material.

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