A method for quickly judging whether an emulsion has an anti-gluten effect and its application

Abstract

The invention relates to the field of *C08F6 / 14, and specifically to a method for quickly judging whether an emulsion has an anti-beading effect and an application thereof. The invention provides a method for quickly judging whether an emulsion has an anti-beading effect in a pioneering manner. The method is simple and efficient. Specifically, the compatibility between a resin emulsion and ethanol is tested, and then a correlation is established between the compatibility between the resin emulsion and ethanol and the anti-beading effect of the emulsion. This provides a new idea for selecting a film-forming resin in an anti-beading primer for water-based woodware, and has a high market application value.

Description

Technical Field

[0001] The invention relates to the field of *C08F6 / 14, and in particular to a method for quickly judging whether an emulsion has an anti-rib expansion effect and an application thereof. Background Art

[0002] In recent years, the country's requirements for environmental protection have become increasingly stringent, which has promoted the rapid development of water-based wood coatings. However, various drawbacks have also emerged in the application of coatings, such as the unavoidable problem of wood rib expansion. Currently, solvent-based and alcohol-soluble coatings are mainly used on the market to seal wood, but the VOC of these two coatings is relatively high, which does not meet the current trend of coatings developing towards environmental protection.

[0003] Chinese patent CN113549388A mentions the use of waterborne polyurethane dispersions with good wetting and permeability, transparent nanofillers and silanes to prepare anti-bulking paint films with high surface hydrophobicity and closure. For wood coating primers, the cost of using polyurethane is high, which is not conducive to promotion. Patent CN113072848A effectively blocks the wood ducts by adding nano-alumina, and uses chitosan to block the hydroxyl groups in the emulsion, thereby improving the water resistance of the paint film and improving the anti-bulking effect of the paint film as a whole. Patents CN113150627A (nano cobalt oxide), CN105111909A (kaolin and bentonite) and CN107974147A (silica sol) also use nanoparticles to improve the anti-bulking and anti-coloring properties of the coating. These water-based coatings with added nanopowders have certain storage stability risks, and some powders affect the transparency of the paint film, resulting in poor final decorative effects. In addition, some woods, such as pine, have a strong odor. When used to make wardrobes or drawers and painted, the odor can still seep out easily, causing an uncomfortable experience for furniture users.

[0004] Therefore, in order to provide a coating that is easy to construct, does not contain isocyanate, prevents swelling, prevents tannins, seals odors, and has good storage stability, the present invention innovatively provides a method for quickly judging whether an emulsion has an anti-swelling effect. The method is simple and efficient, and provides a new idea for the selection of film-forming resins in water-based anti-swelling primers for wood, which has never been recognized before the present invention. Summary of the invention

[0005] In one aspect, the present invention provides a method for quickly determining whether an emulsion has an anti-gluten effect, comprising at least the following steps:

[0006] (1) mixing a resin emulsion with a hydroxyl-containing compound to obtain a mixed emulsion;

[0007] (2) The obtained mixed emulsion is subjected to heat storage, and the gelation time after the heat storage is recorded.

[0008] (3) The anti-beading effect of the water-based anti-beading primer for wood prepared by using the resin emulsion as the film-forming resin is judged based on the gelation time.

[0009] As a preferred technical solution, the resin emulsion includes at least one active group selected from the group consisting of amino, hydrazine, carboxyl and sulfonic acid groups;

[0010] As a preferred technical solution, the viscosity of the resin emulsion (25°C) is 50-2000mPa.s;

[0011] As a preferred technical solution, the resin emulsion is selected from self-crosslinking acrylic emulsion, styrene acrylic emulsion, pure acrylic emulsion, silicone acrylic emulsion, and self-crosslinking styrene acrylic emulsion.

[0012] As a preferred technical solution, the resin emulsion is selected from the group consisting of DSM XK12, DSM XK14, DOW3311, Huaguoshan 3065, Guanzhi PA-4852, Guanzhi PA-4850, Guanzhi PA-4851, Guanzhi PA-4868, Guanzhi PA-4867, Guanzhi PA-4866, and Guanzhi PA-4865;

[0013] As a preferred technical solution, the number of carbon atoms in the hydroxyl-containing compound is less than 6. Preferably, the hydroxyl-containing compound is selected from ethanol, glycerol, methanol, and ethylene glycol; preferably, the hydroxyl-containing compound is ethanol. Preferably, the purity of the ethanol is ≥99.5%.

[0014] As a preferred technical solution, the mass ratio of the resin emulsion to the hydroxyl-containing compound is 1:(1.5-3);

[0015] As a preferred technical solution, the heat storage temperature is 48-55°C.

[0016] As a preferred technical solution, the judgment standard in step (3) is: if the gelation time is ≤0.5h, the anti-beading effect of the water-based anti-beading primer for wood ware prepared by using the resin emulsion as a film-forming resin is level 5; if the gelation time is between 0.5-5h, the anti-beading effect of the water-based anti-beading primer for wood ware prepared by using the resin emulsion as a film-forming resin is between level 4-5; if it still does not gel after 7 days of hot storage, the anti-beading effect of the water-based anti-beading primer for wood ware prepared by using the resin emulsion as a film-forming resin is ≤level 2; among which level 5 is the best anti-beading effect and level 1 is the worst anti-beading effect.

[0017] The inventor found in the process of exploration that by mixing different resin emulsions with hydroxyl-containing compounds, especially when the hydroxyl-containing compound is ethanol, by controlling the same mixing ratio, different gelling times appear under the condition of 50°C heat storage, and the shorter the gelling time, the better the anti-bulking effect of the prepared primer. Therefore, the anti-bulking effect of the water-based anti-bulking primer for woodware prepared by using the water-based single-component resin emulsion as a film-forming resin can be judged according to the gelling time. The inventor speculates that the reason may be that the resin emulsion and ethanol produce a group-specific binding effect, which causes the viscosity of the resin emulsion to rise rapidly and finally gel. This is similar to the principle of hydrogen bonding between the amino group of the cationic resin and the hydroxyl group of the wood. After mixing the resin emulsion and ethanol in the same proportion, the resin emulsion with a shorter gelling time under the condition of 50°C heat storage may form hydrogen bonds with the hydroxyl group of the wood to produce better adhesion, which plays a certain role in preventing water from entering the wood fiber, thereby avoiding the swelling of the wood, while the anti-bulking effect of the primer prepared by other emulsions with better compatibility with ethanol is greatly reduced.

[0018] Another aspect of the present invention provides an application of a method for quickly judging whether an emulsion has an anti-beading effect, which is applied to quickly judging the anti-beading effect of a water-based anti-beading primer for woodware prepared by using a resin emulsion as a film-forming resin.

[0019] Beneficial Effects

[0020] 1. The present invention innovatively provides a method for quickly judging whether an emulsion has an anti-rib expansion effect. The method is simple and efficient, and provides a new idea for the selection of film-forming resins in water-based anti-rib expansion primers for woodware.

[0021] 2. By mixing different resin emulsions with hydroxyl-containing compounds, especially when the hydroxyl-containing compound is ethanol, by controlling the same mixing ratio, different gelation times appear under heat storage conditions at 50°C. The shorter the gelation time, the better the anti-beading effect of the prepared primer. Therefore, the anti-beading effect of the water-based anti-beading primer for wood prepared with a water-based single-component resin emulsion as a film-forming resin can be judged according to the gelation time. DETAILED DESCRIPTION

[0022] Example 1

[0023] Embodiment 1 of the present invention provides a method for quickly judging whether an emulsion has an anti-gluten effect, comprising the following steps:

[0024] (1) mixing a resin emulsion with a hydroxyl-containing compound to obtain a mixed emulsion;

[0025] (2) The obtained mixed emulsion is subjected to heat storage, and the gelation time after the heat storage is recorded.

[0026] (3) The anti-beading effect of the water-based anti-beading primer for wood prepared by using the resin emulsion as the film-forming resin is judged based on the gelation time.

[0027] The model of the resin emulsion is DSM XK12;

[0028] The hydroxyl-containing compound is ethanol, and the purity of the ethanol is 99.5%.

[0029] As a preferred technical solution, the mass ratio of the resin emulsion to the hydroxyl-containing compound is 1:2;

[0030] The heat storage temperature is 50°C.

[0031] The judgment standard in the step (3) is: if the gelation time is ≤0.5h, the anti-beading effect of the water-based anti-beading primer for woodware prepared by using the resin emulsion as a film-forming resin is level 5; if the gelation time is between 0.5-5h, the anti-beading effect of the water-based anti-beading primer for woodware prepared by using the resin emulsion as a film-forming resin is between level 4-5; if it still does not gel after 7 days of heat storage, the anti-beading effect of the water-based anti-beading primer for woodware prepared by using the resin emulsion as a film-forming resin is ≤level 2; among which level 5 is the best anti-beading effect and level 1 is the worst anti-beading effect.

[0032] On the other hand, Example 1 of the present invention provides an application of a method for quickly judging whether an emulsion has an anti-beading effect, which is applied to quickly judge the anti-beading effect of a water-based anti-beading primer for wood prepared by using a resin emulsion as a film-forming resin.

[0033] Example 2

[0034] Embodiment 2 of the present invention provides a method for quickly judging whether an emulsion has an anti-beading effect and its application. The specific implementation manner is the same as that of Embodiment 1, except that the model of the resin emulsion is DSM XK14.

[0035] Example 3

[0036] Embodiment 3 of the present invention provides a method for quickly judging whether an emulsion has an anti-rib expansion effect and its application. The specific implementation method is the same as that of Embodiment 1, except that the model of the resin emulsion is DOW 3311.

[0037] Example 4

[0038] Embodiment 4 of the present invention provides a method for quickly judging whether an emulsion has an anti-rib expansion effect and its application. The specific implementation method is the same as that of Embodiment 1, except that the model of the resin emulsion is Huaguoshan 3065.

[0039] Example 5

[0040] Example 5 of the present invention provides a method for quickly judging whether an emulsion has an anti-rib expansion effect and its application. The specific implementation method is the same as that of Example 1, except that the model of the resin emulsion is Guanzhi PA-4852.

[0041] Example 6

[0042] Example 6 of the present invention provides a method for quickly judging whether an emulsion has an anti-rib expansion effect and its application. The specific implementation method is the same as that of Example 1, except that the model of the resin emulsion is Guanzhi PA-4850.

[0043] Example 7

[0044] Example 7 of the present invention provides a method for quickly judging whether an emulsion has an anti-rib expansion effect and its application. The specific implementation method is the same as that of Example 1, except that the model of the resin emulsion is Guanzhi PA-4851.

[0045] Example 8

[0046] Example 8 of the present invention provides a method for quickly judging whether an emulsion has an anti-rib expansion effect and its application. The specific implementation method is the same as that of Example 1, except that the model of the resin emulsion is Guanzhi PA-4868.

[0047] Example 9

[0048] Example 9 of the present invention provides a method for quickly judging whether an emulsion has an anti-rib expansion effect and its application. The specific implementation method is the same as that of Example 1, except that the model of the resin emulsion is Guanzhi PA-4867.

[0049] Example 10

[0050] Embodiment 10 of the present invention provides a method for quickly judging whether an emulsion has an anti-rib expansion effect and its application. The specific implementation method is the same as that of Embodiment 1, except that the model of the resin emulsion is Guanzhi PA-4866.

[0051] Embodiment 11

[0052] Example 11 of the present invention provides a method for quickly judging whether an emulsion has an anti-rib expansion effect and its application. The specific implementation method is the same as that of Example 1, except that the model of the resin emulsion is Guanzhi PA-4865.

[0053] Performance Testing Methods

[0054] According to the method provided in Example 1-11 for quickly judging whether the emulsion has the effect of preventing bulging, the gelation time under the hot storage conditions of Example 1-11 is shown in Table 1;

[0055] Method verification: The corresponding resin emulsion is used as a film-forming resin to prepare a water-based anti-rib expansion primer for woodware. The formula of the water-based anti-rib expansion primer for woodware and the anti-rib expansion effect of the primer are shown in Table 1.

[0056] Anti-inflation test: 120g / m on a 20*30cm pine board 2 After spraying two coats of the example primer product and the comparative example primer product (Huarun WK8000BS water-based closed anti-bulking primer) and one two-component surface clearing (Huarun WT89900 water-based full semi-transparent topcoat) with a coating amount, the degree of bulging of the wood board was observed and evaluated according to the grades of 1-5, among which grade 5 was the best anti-bulking effect and grade 1 was the worst anti-bulking effect. The anti-bulking effect of the comparative example was grade 4.5, and it gelled within 3 hours after mixing with ethanol and hot storage. Examples 1, 5 and 8 had better anti-bulking effects, among which Example 5, which gelled the fastest, had better anti-bulking effect than the commercially available product WK8000BS, with a grade of 5.

[0057]

Claims

1. A method for quickly judging whether an emulsion has an anti-gluten effect, characterized in that: At least the following steps are included: (1) mixing a resin emulsion with a hydroxyl-containing compound to obtain a mixed emulsion; (2) subjecting the obtained mixed emulsion to heat storage and recording the gelation time after the heat storage; (3) The anti-beading effect of the water-based anti-beading primer for wood prepared by using the resin emulsion as a film-forming resin is judged according to the gelation time; the hydroxyl-containing compound is ethanol, the purity of the ethanol is ≥99.5%, and the heat storage temperature is 50°C.

2. A method for quickly judging whether an emulsion has an anti-gluten effect according to claim 1, characterized in that: The resin emulsion includes at least one active group selected from the group consisting of an amino group, a hydrazine group, a carboxyl group, and a sulfonic acid group.

3. A method for quickly judging whether an emulsion has an anti-rib expansion effect according to claim 1 or 2, characterized in that: The viscosity of the resin emulsion is 50-2000 mPa.s.

4. A method for quickly judging whether an emulsion has an anti-gluten effect according to claim 3, characterized in that: The resin emulsion is selected from self-crosslinking acrylic emulsion, styrene acrylic emulsion, pure acrylic emulsion, silicone acrylic emulsion, and self-crosslinking styrene acrylic emulsion.

5. A method for quickly judging whether an emulsion has an anti-gluten effect according to claim 4, characterized in that: The mass ratio of the resin emulsion to the hydroxyl-containing compound is 1:(1.5-3).

6. A method for quickly judging whether an emulsion has an anti-gluten effect according to claim 5, characterized in that: The judgment standard in step (3) is: if the gelling time is ≤0.5h, the anti-beading effect of the water-based anti-beading primer for woodware prepared by using the resin emulsion as a film-forming resin is level 5; if the gelling time is between 0.5-5h, the anti-beading effect of the water-based anti-beading primer for woodware prepared by using the resin emulsion as a film-forming resin is between level 4-5; if there is still no gelling after 7 days of heat storage, the anti-beading effect of the water-based anti-beading primer for woodware prepared by using the resin emulsion as a film-forming resin is ≤level 2; among which level 5 is the best anti-beading effect and level 1 is the worst anti-beading effect.

7. An application of the method for quickly judging whether an emulsion has an anti-gluten effect according to any one of claims 1 to 6, characterized in that: It is used to quickly judge the anti-beading effect of water-based anti-beading primer for wood prepared with resin emulsion as film-forming resin.

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