Velvet touch interior wall coating and preparation method thereof

Abstract

The invention provides a velvet touch interior wall coating and a preparation method thereof, and relates to the technical field of coatings. The velvet-touch interior wall coating is prepared from a component A and a component B according to the weight ratio of (3 to 5): 1, the component A comprises the following components in percentage by weight: 30-50% of polyurethane emulsion, 20-60% of pigment and filler, 1-10% of auxiliaries and the balance of water; the component B comprises a first water dispersible isocyanate curing agent, and the first water dispersible isocyanate curing agent is a polyether modified silicone oil modified isocyanate curing agent; and the weight percentage of the NCO group in the component B is not less than 15%. The inner wall coating with the velvet touch feeling has the velvet touch feeling and is good in durability.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings and relates to a velvet-touch interior wall coating and a preparation method thereof. Background Art

[0002] Interior wall paint plays a decorative and protective role in the home environment. As people's requirements for living environment increase, they have more requirements for the performance of interior wall paint. For example, the feel of the interior wall is becoming richer and better. Among them, velvet touch is a very good feel that can improve the quality and value of interior wall paint. Velvet feel generally uses polyurethane as a bonding material, and adds a slip agent (such as polyether modified silicone oil) to improve the velvet feel. However, there are at least the following two problems: (1) The velvet feel is insufficient. Increasing the amount of slip agents can improve the feel, but it will affect the adhesion of the coating; (2) The slip agent generally migrates to the surface of the coating, and after a long period of friction, it is easy to fail, resulting in a deterioration of the velvet feel. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a velvet-touch interior wall paint and a preparation method thereof.

[0004] The technical solution of the present invention is as follows:

[0005] A velvet touch interior wall paint, comprising component A and component B in a weight ratio of 3-5:1;

[0006] The component A comprises 30-50% polyurethane emulsion, 20-60% pigment and filler, 1-10% additive, and the balance is water, based on 100% by weight;

[0007] The B component comprises a first water-dispersible isocyanate curing agent, wherein the first water-dispersible isocyanate curing agent is an isocyanate curing agent modified with a polyether-modified silicone oil;

[0008] The weight percentage of NCO groups in the B component is not less than 15%.

[0009] Preferably, the polyurethane emulsion is a polysiloxane-modified polyurethane emulsion.

[0010] More preferably, the weight proportion of polysiloxane diol in the polymer diol in the polysiloxane-modified polyurethane emulsion is not higher than 10%.

[0011] Preferably, the structure of the polyether-modified silicone oil used in the polyether-modified silicone oil-modified isocyanate curing agent is as shown in the following formula (1):

[0012] HO(CH2) m SiMe2O(SiOMe2) a (SiOMeR1 ) b SiMe2(CH2) m OH(1)

[0013] Among them, R 1 -(CH2) n (OCH2CH2) c (OCH2CHCH3) d OR 2 , n=3-5, c≥0, d≥0, 5≤c+d≤100, R 2 Selected from H or C1-C4 alkyl, Me represents methyl, m=2-6, a>0, b>0, a+b≤100, 0.05≤a / (a+b)≤0.7.

[0014] More preferably, the values ​​of a and b satisfy: 0.15≤a / (a+b)≤0.5.

[0015] More preferably, the values ​​of c and d satisfy: 0.4≤c / (c+d)≤0.9.

[0016] Preferably, the NCO group content of the first water-dispersible isocyanate curing agent is not less than 10 wt %.

[0017] More preferably, the first water-dispersible isocyanate curing agent is obtained by reacting a polyether-modified silicone oil with an isocyanate trimer.

[0018] More preferably, the B component further contains a second water-dispersible isocyanate curing agent, and the NCO group content of the second water-dispersible isocyanate curing agent is not less than 20 wt %.

[0019] The method for preparing the velvet touch interior wall paint described in any of the above technical solutions comprises the following steps:

[0020] Mixing and evenly dispersing the raw material components of the A component to obtain the A component;

[0021] Mixing and evenly dispersing the raw material components of the B component to obtain the B component;

[0022] The component A and the component B are mixed evenly to obtain the product.

[0023] The beneficial effects of the present invention are:

[0024] (1) Polyether-modified silicone oil is a commonly used slip agent in the field of coatings and is generally directly added to the coating. The present invention chemically bonds the polyether-modified silicone oil to the isocyanate curing agent, and introduces the polyether-modified silicone oil into the interior wall coating by modifying the curing agent, thereby improving the velvet feel of the cured coating. Moreover, since the polyether-modified silicone oil is chemically bonded and distributed in the entire coating, even after long-term friction or the surface is worn by friction, it can still maintain a good velvet feel and has a long action time.

[0025] (2) The polyurethane emulsion used contains a certain amount of polysiloxane segments, which can further improve the velvety feel of the cured coating. In addition, since part of the polysiloxane structure is introduced into the coating, the waterproofness of the cured coating can also be improved.

[0026] (3) Even if a large amount of polyether-modified silicone oil is added, the chemical bonding inhibits the migration of the polyether-modified silicone oil and will not have an adverse effect on the adhesion of the coating. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further illustrated and described below through specific implementation methods.

[0028] In order to improve the velvet feel of interior wall paint and maintain the long-term effect of the velvet feel, on the one hand, the present invention provides a velvet touch interior wall paint, which is composed of component A and component B in a weight ratio of 3-5:1;

[0029] Component A, based on 100% by weight, comprises 30-50% polyurethane emulsion, 20-60% pigment and filler, 1-10% additive, and the balance is water;

[0030] Component B comprises a first water-dispersible isocyanate curing agent, wherein the first water-dispersible isocyanate curing agent is an isocyanate curing agent modified with a polyether-modified silicone oil;

[0031] The weight percentage of NCO groups in component B is not less than 15%.

[0032] The interior wall paint of the present invention adopts polyurethane emulsion as a binder, which can give the interior wall paint a relatively good velvet feel, and by introducing a polyether-modified silicone oil structure into an isocyanate curing agent (polyether-modified silicone oil is a commonly used paint lubricating agent, but is generally directly added to the paint), the interior wall paint contains a chemically bonded polyether-modified silicone oil structure, which further improves the velvet feel of the interior wall paint, and because the polyether-modified silicone oil is chemically bonded to the curing agent, it has good stability and a long-lasting effect.

[0033] In the present invention, the polyurethane emulsion is not particularly limited, and can be emulsified by an emulsifier, such as nonionic polyurethane emulsion, anionic polyurethane emulsion, cationic polyurethane emulsion, etc., or can also be a polyurethane self-emulsifying dispersion, such as anionic polyurethane self-emulsifying dispersion, cationic polyurethane self-emulsifying dispersion, etc. The concentration of the polyurethane emulsion is not particularly limited, and can be 10-60wt%, or further, the concentration is 30-60wt%. There is no particular limitation on the color filler, and the pigment can be an inorganic pigment or an organic pigment, such as titanium dioxide, phthalocyanine blue, phthalocyanine green, chrome yellow, etc.; the filler can be an organic filler or an inorganic filler, such as kaolin, talc, wollastonite, polyethylene micropowder, etc. The auxiliary agent can be a dispersant, a leveling agent, a wetting agent, a defoamer, a thickener, a thixotropic agent, etc.

[0034] In the present invention, the polyurethane emulsion is a polysiloxane-modified polyurethane emulsion. The introduction of polysiloxane in the polysiloxane-modified polyurethane emulsion has two functions: (1) further improving the velvety touch of the interior wall emulsion; (2) improving the waterproof performance of the interior wall coating. The preparation of the polysiloxane-modified polyurethane emulsion can refer to the prior art, such as the journal articles "Synthesis of Organic Siloxane-Modified Waterborne Polyurethane" (Coating Industry, 2006, Vol. 36, No. 6, pp. 8-10), "Synthesis of Polysiloxane-Modified Polyurethane and Study on Emulsion Particle Size" (Journal of Zhejiang University of Science and Technology, No. 3, 2005, pp. 187-190), etc. More preferably, the weight proportion of polysiloxane diol in the polymer diol in the polysiloxane-modified polyurethane emulsion is not higher than 10%. The inventors found that if the weight proportion of the polysiloxane segment in the polysiloxane-modified polyurethane is too high, it is not conducive to improving the velvety touch of the interior wall paint, and has an adverse effect on the adhesion of the coating. Therefore, the proportion of polysiloxane diol in the raw material of polyurethane, the polymer diol, is controlled. In the present invention, the polysiloxane diol can be double-terminated hydroxypropyl polydimethylsiloxane, double-terminated hydroxybutyl polydimethylsiloxane, etc., and the number average molecular weight can be 300-2000.

[0035] In the present invention, the structure of the polyether-modified silicone oil used in the isocyanate curing agent modified with polyether-modified silicone oil is as shown in the following formula (1):

[0036] HO(CH2) m SiMe2O(SiOMe2) a (SiOMeR 1 ) b SiMe2(CH2) m OH(1)

[0037] Among them, R 1 -(CH2) n (OCH2CH2) c (OCH2CHCH3) dOR 2 , n=3-5, c≥0, d≥0, 5≤c+d≤100, R 2 Selected from H or C1-C4 alkyl, Me represents methyl, m=2-6, a>0, b>0, a+b≤100, 0.05≤a / (a+b)≤0.7.

[0038] The terminal group of polyether-modified silicone oil is carbon hydroxyl group, which can participate in the synthesis reaction of polyurethane. The polysiloxane structure is bonded to the main chain of the curing agent, and the polyether is grafted on the side chain of the curing agent. It is not easy to fail and has a long-lasting effect. Compared with polyether-modified silicone oil directly added to the paint, it has a more obvious effect of enhancing the velvet touch of the paint.

[0039] In the present invention, the polyether modified silicone oil can be prepared by a hydrosilylation method, wherein the double-terminated hydroxyalkyl hydrogen-containing silicone oil HO(CH2) m SiMe2O(SiOMe2) a (SiOMeH) b SiMe2(CH2) m OH and terminal olefin polyether CH2=CH(CH2) n-2 (OCH2CH2) c (OCH2CHCH3) d OR 2 Hydrosilylation reaction was performed to obtain Me, R 2 The meanings of m, n, a, b, c and d are as described above. The catalyst for the hydrosilylation reaction can be a Speier catalyst or a Karstedt catalyst. The above-mentioned double-terminal hydroxyalkyl hydrogen-containing silicone oil can be prepared by a double-terminal hydroxyalkyl capping agent HO(CH2) m SiMe2O(SiOMe2) x SiMe2(CH2) m OH and hydrogen-containing silicone oil are obtained by equilibrium reaction under an acidic catalyst (such as concentrated sulfuric acid, acid clay or trifluoromethanesulfonic acid), or by a double-terminal hydroxyalkyl capping agent and tetramethylcyclotetrasiloxane (D4 H ) (or also contains octamethylcyclotetrasiloxane D 4 ) is obtained by ring-opening polymerization in the presence of an acidic catalyst, wherein the value of x is generally 0-5, which is a technique well known to those skilled in the art.

[0040] In the polyether-modified silicone oil shown in the above formula (1), if the value of a is too low, the polysiloxane segment is too little, and the effect of improving the velvety touch of the interior wall paint is not strong; if the value of a is too high, the hydrophobicity of the polyether-modified silicone oil will be too strong, resulting in the deterioration of the hydrophilicity of the curing agent, and it will also affect the reactivity of the double-terminal hydroxyalkyl group. More preferably, the values ​​of a and b satisfy: 0.15≤a / (a+b)≤0.5. For example, the value of a / (a+b) can be any value of 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, etc. or any value in between, without special restrictions.

[0041] R in the above formula (1) 1 In the embodiment, if the molar ratio of c is too low, the hydrophilicity of the curing agent will be affected. More preferably, the values ​​of c and d satisfy: 0.4≤c / (c+d)≤0.9. For example, the value of c / (c+d) can be any value among 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, etc. or any value therebetween, without any particular limitation.

[0042] In the present invention, the content of the NCO group of the first water-dispersible isocyanate curing agent is not less than 10wt%. If the content of the NCO group of the first water-dispersible isocyanate curing agent is too low, the reactivity of the NCO group will be affected, and the curing rate and degree of curing will be affected. If the curing is too slow, the NCO group may also react with the water vapor in the air to form bubbles, which will affect the quality of the interior wall coating.

[0043] More preferably, the first water-dispersible isocyanate curing agent is obtained by reacting polyether-modified silicone oil and isocyanate trimer. Using the above technical solution, the first water-dispersible isocyanate curing agent is trifunctional, which can make the interior wall coating have a more suitable crosslinking density after curing, improve the performance of the coating, such as stain resistance, water resistance, etc., and also help to enhance the velvet touch. The reaction of polyether-modified silicone oil and isocyanate trimer can be prepared by referring to the reaction of polyether diol and isocyanate trimer. There is no particular limitation on the isocyanate trimer, and it can be HDI trimer, TDI trimer, HMDI trimer, etc.

[0044] More preferably, component B further contains a second water-dispersible isocyanate curing agent, and the content of NCO groups of the second water-dispersible isocyanate curing agent is not less than 20wt%. The second water-dispersible isocyanate curing agent has a higher NCO group content and a higher curing rate, thereby improving the curing rate and crosslinking density of the interior wall coating. The second water-dispersible isocyanate curing agent can be directly obtained from the market, such as Aquolin 268 of Wanhua Chemical, HXT-100 of Jiangsu Huaxia Paint Technology Co., Ltd., Bayhydur XP 2655 of Covestro, etc.

[0045] On the other hand, the present invention also provides a method for preparing the velvet touch interior wall paint described in any of the above technical solutions, which can be prepared according to a conventional water-based paint preparation method, and specifically may include the following steps:

[0046] Mix and evenly disperse the raw material components of component A to obtain component A;

[0047] Mixing and evenly dispersing the raw material components of component B to obtain component B;

[0048] Mix component A and component B evenly to obtain the product.

[0049] The technical solution of the present invention is further described and illustrated according to various embodiments below. Unless otherwise specified, the parts described in the following embodiments are parts by weight.

[0050] Polyether modified silicone oil 1: HO(CH2)3SiMe2O(SiOMe2) 13.8 (SiOMeR 1 ) 16.3 SiMe2(CH2)3OH, where R 1 -(CH2)3(OCH2CH2) 9.4 (OCH2CHCH3) 5.5 OCH3.

[0051] Polyether modified silicone oil 2: HO(CH2)3SiMe2O(SiOMe2) 10.2 (SiOMeR 1 ) 15.8 SiMe2(CH2)3OH, where R 1 -(CH2)3(OCH2CH2) 12.5 (OCH2CHCH3) 8.4 OC4H9.

[0052] Preparation Example 1-3 Preparation of polyether-modified silicone oil-modified isocyanate curing agent

[0053] Preparation Example 1

[0054] 1 mol of HDI trimer was added to the reaction vessel, the temperature was raised to 70°C, and the polyether-modified silicone oil 1 was added in three batches, once every half an hour. After the addition, the reaction was continued at a constant temperature until the NCO group content remained unchanged, thereby obtaining an isocyanate curing agent modified with polyether-modified silicone oil, and the NCO content was measured to be 10.7 wt%.

[0055] Preparation Example 2

[0056] 1 mol of HDI trimer was added to the reaction vessel, the temperature was raised to 70°C, and the polyether-modified silicone oil 1 was added in three batches, once every half an hour. After the addition, the reaction was continued at a constant temperature until the NCO group content remained unchanged, thereby obtaining an isocyanate curing agent modified with polyether-modified silicone oil, and the NCO content was measured to be 12.6 wt%.

[0057] Preparation Example 3

[0058] 1 mol of HDI trimer was added to the reaction vessel, the temperature was raised to 70°C, and the polyether-modified silicone oil 2 was added in three batches, once every half an hour. After the addition, the reaction was continued at a constant temperature until the NCO group content remained unchanged, and the isocyanate curing agent modified with polyether-modified silicone oil was obtained, and the NCO content was measured to be 12.1 wt%.

[0059] Comparative Preparation Example 1

[0060] 1 mol of HDI trimer was added to the reaction vessel, the temperature was raised to 70°C, and polyethylene glycol (number average molecular weight 800) was added in three batches, once every half an hour. After the addition, the reaction was continued at a constant temperature until the NCO group content remained unchanged, and a polyether-modified isocyanate curing agent was obtained, and the NCO content was measured to be 12.3 wt%.

[0061] Preparation Example 4-6 Preparation of polyurethane emulsion

[0062] Preparation Example 4

[0063] Add 1 mol of dehydrated polyester diol (number average molecular weight 1000) into a reaction container, add 1.4 mol of HMDI and react at 74±1°C for 3h, add 0.1 mol of 1,4-butanediol and continue for 1h, then add 0.2 mol of dihydroxymethylpropionic acid and 400g of acetone, react at 68±1°C until the NCO content reaches the theoretical value, cool to 40°C, add an appropriate amount of triethylamine to neutralize to neutrality, add 1200g of water for emulsification, and use an appropriate amount of ethylenediamine to extend the chain, remove acetone in vacuo, add water to adjust the concentration to 45wt%, and obtain a polyurethane emulsion.

[0064] Preparation Example 5

[0065] The difference between this preparation example and preparation example 4 is that the polyester diol in preparation example 4 is adjusted to be composed of the polyester diol in preparation example 4 and double-terminated hydroxypropyl polydimethylsiloxane (number average molecular weight 650) in an equimolar ratio of 95:5. The remaining steps remain unchanged.

[0066] Preparation Example 6

[0067] The difference between this preparation example and preparation example 5 is that the weight ratio of polyester diol to double-terminated hydroxypropyl polydimethylsiloxane in preparation example 5 is adjusted from 95:5 to 9:1. The remaining steps remain unchanged.

[0068] Comparative Preparation Example 2

[0069] The difference between this comparative preparation example and preparation example 5 is that the weight ratio of polyester diol to double-terminated hydroxypropyl polydimethylsiloxane in preparation example 5 is adjusted from 95:5 to 88:12. The remaining steps remain unchanged.

[0070] Example 1

[0071] The velvet touch interior wall paint is obtained by mixing component A and component B in a weight ratio of 4:1 and stirring evenly.

[0072] Component A is composed of 40% of the polyurethane emulsion of Preparation Example 4, 57.3% of titanium dioxide, 1% of dispersant BYK-2013, 0.5% of leveling agent BYK-333, 0.6% of defoamer BYK-094, and 0.6% of thickener RM-8W, according to 100% by weight. BYK-2013 is added to the polyurethane emulsion, stirred at 500 rpm for 5 minutes, then titanium dioxide is added, stirred at 1500 rpm for 15 minutes, then BYK-094 and RM-8W are added, stirred at 600 rpm for 8 minutes, and finally BYK-333 is added, stirred at 600 rpm for 10 minutes to obtain component A.

[0073] Component B is composed of 100% by weight of the isocyanate curing agent modified by the polyether-modified silicone oil of Preparation Example 1 and Aquolin 268 of Wanhua Chemical. The NCO content of component B is 16.5 wt%.

[0074] Example 2

[0075] The difference between this embodiment and embodiment 1 is that in embodiment 1, the polyurethane emulsion of preparation example 4 is replaced by an equal weight of the polyurethane emulsion of preparation example 5, and the other steps remain unchanged.

[0076] Example 3

[0077] The difference between this embodiment and embodiment 1 is that in embodiment 1, the polyurethane emulsion of preparation example 4 is replaced by an equal weight of the polyurethane emulsion of preparation example 6, and the other steps remain unchanged.

[0078] Comparative Example 1

[0079] The difference between this comparative example and Example 1 is that in Example 1, the polyurethane emulsion of Preparation Example 4 is replaced by an equal weight of the polyurethane emulsion of Comparative Preparation Example 2, and the other steps remain unchanged.

[0080] Comparative Example 2

[0081] The difference between this comparative example and Example 1 is that in Example 1, the polyether-modified silicone oil-modified isocyanate curing agent of Preparation Example 1 is replaced with an equal weight of the polyether-modified isocyanate curing agent of Comparative Preparation Example 1, and the other steps remain unchanged.

[0082] Comparative Example 3

[0083] The difference between this comparative example and Example 3 is that in Example 3, the polyether-modified silicone oil-modified isocyanate curing agent of Preparation Example 1 is replaced with an equal weight of the polyether-modified isocyanate curing agent of Comparative Preparation Example 1, and the other steps remain unchanged.

[0084] Comparative Example 4

[0085] The difference between this comparative example and comparative example 2 is that 1% by weight of Dow Corning hand feeling agent DC-51 is added to the interior wall paint of comparative example 2, and the other steps remain unchanged.

[0086] Comparative Example 5

[0087] The difference between this comparative example and comparative example 2 is that 2.5% by weight of Dow Corning hand feeling agent DC-51 is added to the interior wall paint of comparative example 2, and the other steps remain unchanged.

[0088] Example 4

[0089] The velvet touch interior wall paint is obtained by mixing component A and component B in a weight ratio of 3.5:1 and stirring evenly.

[0090] Component A is 100% by weight and is composed of 45% of the polyurethane emulsion of Preparation Example 5, 30% of titanium dioxide, 17.1% of heavy calcium carbonate, 0.8% of dispersant BYK-2013, 0.5% of leveling agent BYK-333, 0.6% of defoamer BYK-094, 1% of thickener RM-8W and the balance of water. BYK-2013 is added to the polyurethane emulsion, stirred at 500 rpm for 5 minutes, titanium dioxide and heavy calcium carbonate are added, stirred at 1500 rpm for 20 minutes, BYK-094 and RM-8W are added, stirred at 600 rpm for 8 minutes, and finally BYK-333 and water are added, stirred at 600 rpm for 10 minutes to obtain component A.

[0091] Component B is composed of 100% by weight of the isocyanate curing agent modified by the polyether-modified silicone oil of Preparation Example 1 and Aquolin 268 of Wanhua Chemical. The NCO content of component B is 17.0 wt%.

[0092] Example 5

[0093] The difference between this example and Example 4 is that in Example 4, the polyether-modified silicone oil-modified isocyanate curing agent of Preparation Example 1 is replaced by an equal weight of the polyether-modified silicone oil-modified isocyanate curing agent of Preparation Example 2. The remaining steps remain unchanged.

[0094] Example 6

[0095] The difference between this example and Example 4 is that in Example 4, the polyether-modified silicone oil-modified isocyanate curing agent of Preparation Example 1 is replaced by an equal weight of the polyether-modified silicone oil-modified isocyanate curing agent of Preparation Example 3. The remaining steps remain unchanged.

[0096] Example 7

[0097] The difference between this embodiment and embodiment 4 is that in embodiment 4, the NCO content of component B is adjusted from 17.0 wt % to 15.3 wt %, and the other steps remain unchanged.

[0098] Example 8

[0099] The difference between this embodiment and embodiment 4 is that in embodiment 4, the NCO content of component B is adjusted from 17.0 wt % to 16.1 wt %, and the other steps remain unchanged.

[0100] Comparative Example 6

[0101] The difference between this comparative example and Example 4 is that in Example 4, the polyether-modified silicone oil-modified isocyanate curing agent of Preparation Example 1 is replaced by an equal weight of the polyether-modified isocyanate curing agent of Comparative Preparation Example 1. The remaining steps remain unchanged.

[0102] Performance Testing

[0103] The interior wall coating to be tested was sprayed onto a flat concrete substrate with a size of 20 cm×10 cm×2 mm. It was cured at room temperature for 72 hours and the film thickness was 200 μm.

[0104] Velvet touch evaluation: Each film layer to be tested is scored by 10 trained testers on a scale of 1-10, with 1 being the lowest score for pure cotton and 10 being the highest score for natural silk. After removing the highest and lowest scores from the 10 scores, the remaining 8 scores are averaged. The higher the average score, the better the velvet touch.

[0105] Velvet touch durability: The surface of each film layer to be tested is polished with 200-grit sandpaper to remove a thickness of about 10 μm, and the velvet touch is scored according to the above-mentioned velvet touch evaluation method.

[0106] Adhesion evaluation: Evaluate according to the method of GB / T9286-2021. The adhesion level is divided into 0 to 5 levels, and the smaller the level number, the better the adhesion.

[0107] Waterproof evaluation: Evaluate according to the immersion test method in GB / T 1733-1993. Observe the film every 2 hours to see if there is any abnormality such as shedding, bubbling, or edge lifting. The last 2 hours of the abnormality is the waterproof time. The longer the waterproof time, the better the waterproofness.

[0108] The results are shown in Table 1 below.

[0109] Table 1

[0110]

[0111]

[0112] It can be seen from the data results in Table 1 that the velvet touch interior wall paint of the present invention has a good velvet touch, still has a good velvet touch after wear and tear, has good durability, and has good adhesion and waterproof properties.

[0113] As described above, the basic principles, main features and advantages of the present invention are shown and described. Those skilled in the art should understand that the present invention is not limited by the above embodiments, which are only preferred embodiments of the present invention and cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the scope of the present invention and the content of the specification should still be within the scope of the present invention. The scope of protection required by the present invention is defined by the attached claims and their equivalents.

Claims

1. A velvet touch interior wall paint, characterized in that: It is composed of component A and component B in a weight ratio of 3-5:1; The component A comprises 30-50% polyurethane emulsion, 20-60% pigment and filler, 1-10% additive, and the balance is water, based on 100% by weight; The B component comprises a first water-dispersible isocyanate curing agent, wherein the first water-dispersible isocyanate curing agent is an isocyanate curing agent modified with a polyether-modified silicone oil; The weight percentage of NCO groups in the B component is not less than 15%.

2. The velvet touch interior wall paint according to claim 1, characterized in that: The polyurethane emulsion is a polysiloxane-modified polyurethane emulsion.

3. The velvet touch interior wall paint according to claim 2, characterized in that: The weight proportion of polysiloxane diol in the polymer diol in the polysiloxane-modified polyurethane emulsion is not higher than 10%.

4. The velvet touch interior wall paint according to claim 1, characterized in that: The structure of the polyether-modified silicone oil used in the polyether-modified silicone oil-modified isocyanate curing agent is as shown in the following formula (1): HO(CH2) m SiMe2O(SiOMe2) a (SiOMeR 1 ) b SiMe2(CH2) m OH(1) Among them, R 1 -(CH2) n (OCH2CH2) c (OCH2CHCH3) d OR 2 , n=3-5, c≥0, d≥0, 5≤c+d≤100, R 2 Selected from H or C1-C4 alkyl, Me represents methyl, m=2-6, a>0, b>0, a+b≤100, 0.05≤a / (a+b)≤0.

7.

5. The velvet touch interior wall paint according to claim 4, characterized in that: The values ​​of a and b satisfy: 0.15≤a / (a+b)≤0.

5.

6. The velvet touch interior wall paint according to claim 4, characterized in that: The values ​​of c and d satisfy: 0.4≤c / (c+d)≤0.

9.

7. The velvet touch interior wall paint according to claim 1, characterized in that: The NCO group content of the first water-dispersible isocyanate curing agent is not less than 10 wt %.

8. The velvet touch interior wall paint according to claim 1, characterized in that: The first water-dispersible isocyanate curing agent is obtained by reacting polyether-modified silicone oil and isocyanate trimer.

9. The velvet touch interior wall paint according to claim 1, characterized in that: The B component further contains a second water-dispersible isocyanate curing agent, and the NCO group content of the second water-dispersible isocyanate curing agent is not less than 20 wt %.

10. The method for preparing the velvet touch interior wall paint according to any one of claims 1 to 9, characterized in that: The following steps are involved: Mixing and evenly dispersing the raw material components of the A component to obtain the A component; Mixing and evenly dispersing the raw material components of the B component to obtain the B component; The component A and the component B are mixed evenly to obtain the product.

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