A high performance sound insulation coating and preparation method thereof

Abstract

The invention relates to the technical field of coatings, and discloses a high-performance sound insulation coating and a preparation method thereof. The sound insulation coating is formed by mixing epoxy resin as a base material and supplemented with auxiliary materials such as functional additives, wherein the functional additive is an aerogel-type substance with clay as a cross-linking core, and the polymer aerogel on the surface of the clay can form a transition connection layer between the clay and the epoxy resin matrix. Since the polymer aerogel is formed by freeze-drying cross-linked maltose, the remaining hydroxyl groups that do not participate in the reaction in its structure can participate in the curing process of the epoxy resin coating, so that the clay can be evenly dispersed in the epoxy resin matrix and produce an anchoring effect, which can not only exert the sound absorption effect of its own porous structure, but also use its own advantage as an inorganic substance to improve the strength of the coating, and the aerogel-type structure can reduce the reflection and propagation of sound waves, absorb sound waves, and effectively improve the sound insulation effect of the coating.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a high-performance sound insulation coating and a preparation method thereof. Background Art

[0002] With the rapid development of high-speed rail, the increase in road network density, and the increase in train speed, the noise level of train operation has greatly increased, which has brought serious impacts to the residences on both sides of the line, especially in hospitals, schools, residential areas and other areas that are sensitive to noise. There are more and more complaints from residents caused by high-speed rail noise. While high-speed rail is developing, the problem of noise pollution cannot be ignored. In recent years, as people pay more and more attention to the residential sound environment, a group of new sound insulation materials have emerged, among which sound insulation coatings stand out. Sound insulation coatings generally play a role in sound absorption and sound insulation by reducing the transmitted sound wave energy. With the increasing maturity of coating technology and the rapid development of sound insulation materials, sound insulation coatings have been applied to all aspects of social production and people's daily life.

[0003] Among many coating substrates, epoxy resin has become the best choice for architectural sound insulation coatings due to its excellent comprehensive properties such as corrosion resistance, moisture resistance, and wear resistance. However, the sound insulation additives currently used are generally inorganic materials with a porous structure. There are serious interface problems between these inorganic materials and the epoxy resin matrix, which may cause a significant reduction in the mechanical properties of the coating formed after the coating is cured. Therefore, how to reasonably design the formula of epoxy resin coatings to give the coatings good sound insulation properties while not affecting the coating's own performance has become a research hotspot in recent years. 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 high-performance sound insulation coating and a preparation method thereof.

[0006] (II) Technical solution

[0007] A method for preparing a high-performance sound insulation coating, wherein the sound insulation coating is prepared by using the following raw materials measured in parts by weight:

[0008] Epoxy resin 55-60 parts;

[0009] 3-6 portions of functional additives;

[0010] 5-10 parts of inorganic filler;

[0011] 5-15 parts of diluent;

[0012] 25-35 parts of curing agent;

[0013] Thixotropic agent 0.5-1.5 parts;

[0014] Defoaming agent 0.5-1.5 parts;

[0015] 0.5-1 part of leveling agent;

[0016] The preparation method comprises the following steps:

[0017] Step 1: Weigh and prepare all components according to their weight;

[0018] Step 2: Add epoxy resin, functional additives, inorganic fillers, diluents, thixotropic agents and leveling agents into a mixer, control the stirring rate to 300-500r / min, mechanically stir and mix evenly, then add the defoamer into the mixer, stir for 10-20min, and let stand for 20-40min to defoam, to form a premix;

[0019] Step 3: Add the curing agent to the premix, stir evenly, discharge the material, and store it at room temperature to obtain the sound insulation coating.

[0020] As a further embodiment of the present invention, the epoxy resin is any one of bisphenol A epoxy resin and bisphenol F epoxy resin.

[0021] As a further embodiment of the present invention, the method for preparing the functional additive comprises the following steps:

[0022] Step S1, adding clay to an ethanol solution with a volume fraction of 50-60%, uniformly dispersing by ultrasonication, and then adding a silane coupling agent. After the addition is completed, the temperature is increased to 60-70° C., and after being stirred for 3-6 hours, the temperature is lowered and the material is discharged to obtain a functionalized modified clay;

[0023] Step S2, ultrasonically dispersing the functionalized modified clay in an ethanol solution with a volume fraction of 60-70% to form a uniform dispersion, then adding the cross-linked maltose and the catalyst to the dispersion, after the addition, raising the temperature to 70-80°C, stirring at a constant temperature for 8-12 hours, stopping heating, and pouring the material into a mold after cooling. After the material is gelled, placing the mold in a freeze dryer, controlling the temperature to -50°C, freeze drying for 24-36 hours, taking it out, and crushing it to obtain the functional additive.

[0024] As a further embodiment of the present invention, in step S1, the silane coupling agent is γ-glycidyloxypropyltrimethoxysilane or γ-glycidyloxypropyltriethoxysilane.

[0025] As a further embodiment of the present invention, in step S2, the specific preparation method of the cross-linked maltose is as follows:

[0026] Add maltose to N,N-dimethylformamide, stir and mix evenly, then add alkaline hydroxide aqueous solution, after adding, keep stirring at 50-60°C for 1-2h, then continue to add cross-linking agent, and at the same time increase the temperature to 80-100°C, carry out cross-linking reaction under nitrogen protection for 8-12h, stop heating, remove nitrogen, cool and discharge, and then cross-linked maltose can be obtained.

[0027] As a further embodiment of the present invention, the alkaline hydroxide is potassium hydroxide or sodium hydroxide; and the mass fraction of the alkaline hydroxide aqueous solution is 20-30%.

[0028] As a further embodiment of the present invention, the cross-linking agent is at least one of 2,2'-dibromodiethyl ether, brominated-triethylene glycol-bromo or brominated-tetraethylene glycol-bromo.

[0029] As a further embodiment of the present invention, in step S2, the catalyst is boron trifluoride etherate complex.

[0030] In the above technical scheme, maltose is cross-linked with a cross-linking agent to convert the molecular weight of maltose from a linear structure to a network structure to obtain cross-linked maltose. Then, a catalyst is used to catalyze the remaining hydroxyl groups in the cross-linked maltose structure to undergo ring-opening addition with epoxy-functionalized modified clay, thereby modifying the cross-linked maltose on the clay surface. Subsequently, freeze-drying is performed using a freeze-drying method to obtain an aerogel-type substance with clay as the cross-linked core, i.e., a functional additive.

[0031] As a further embodiment of the present invention, the inorganic filler is at least one of talc, calcium carbonate or titanium dioxide; the diluent is 2-glycidyl glycidyl ether or 3,4-epoxycyclohexanecarboxylate; the curing agent is an anhydride curing agent; the thixotropic agent is fumed silica; the defoaming agent is BYK-052N or BYK-085; and the leveling agent is BYK-310 or BYK-315N.

[0032] A high-performance sound insulation coating is prepared by adopting the above preparation method.

[0033] 3. Beneficial technical effects

[0034] (1) The present invention uses an aerogel-type substance with clay as a cross-linked core as a functional additive to modify the epoxy resin coating. First, the polymer aerogel on the surface of the clay can form a transition connection layer between the clay and the epoxy resin matrix. Since the polymer aerogel is formed by cross-linking maltose through freeze-drying, the remaining hydroxyl groups in its structure that do not participate in the reaction can participate in the curing process of the epoxy resin coating, thereby forming a chemical connection between the clay and the epoxy resin, so that the clay can be evenly dispersed in the epoxy resin matrix and produce an anchoring effect, which can not only give play to the sound absorption effect of its own porous structure, but also take advantage of its own inorganic substance to improve the strength of the coating.

[0035] (2) The functional additive prepared by the present invention has an aerogel-type structure. Since the aerogel is rich in pores, it can reduce the reflection and propagation of sound waves and increase the loss of sound waves. At the same time, the presence of the clay core can play a skeleton support effect and prevent the pores of the aerogel from collapsing, thereby producing a synergistic effect and absorbing sound waves, thereby effectively improving the sound insulation effect of the coating. DETAILED DESCRIPTION

[0036] In order to facilitate the understanding of the present invention, the present invention will be described more fully below. Preferred embodiments of the present invention are given below. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0037] Preparation Example 1

[0038] Preparation of functional additives:

[0039] Step S1, adding 5 g of clay to a 60% by volume ethanol solution, uniformly dispersing by ultrasonication, and then adding 2.4 g of γ-glycidyloxypropyltriethoxysilane. After the addition, raising the temperature to 70° C., stirring at this temperature for 4 h, cooling and discharging the material to obtain functionalized modified clay;

[0040] Step S2, adding 1.2 g of maltose to N, N-dimethylformamide, stirring and mixing evenly, then adding 10 mL of 200% alkaline potassium hydroxide aqueous solution, after the addition, stirring at 60 ° C for 1 h, then continuing to add 0.5 g of brominated-triethylene glycol-bromo, while raising the temperature to 100 ° C, carrying out the cross-linking reaction under nitrogen protection for 9 h, stopping heating, removing nitrogen, cooling and discharging, and obtaining cross-linked maltose;

[0041] Step S3, ultrasonically disperse 1g of functionalized modified clay in a 70% volume fraction ethanol solution to form a uniform dispersion, then add 1.5g of cross-linked maltose and 0.1g of boron trifluoride ether complex to the dispersion, after adding, raise the temperature to 75°C, stir at a constant temperature for 9h, stop heating, pour the material into a mold after cooling, place the mold in a freeze dryer after the material is gelled, control the temperature to -50°C, freeze-dry for 24h, take out, and crush to obtain the functional additive.

[0042] Example 1

[0043] A high-performance sound insulation coating is prepared from the following raw materials measured in parts by weight:

[0044] Epoxy resin 55 parts;

[0045] 3 parts of functional additives;

[0046] 5 parts of talcum powder;

[0047] 5 parts of 2-glycidyl glycidyl ether;

[0048] 25 parts of curing agent;

[0049] 0.5 parts of fumed silica;

[0050] BYK-052N 0.5 parts;

[0051] BYK-310 0.5 parts;

[0052] The preparation method comprises the following steps:

[0053] Step 1: Weigh and prepare all components according to their weight;

[0054] Step 2: Add epoxy resin, functional additives, talcum powder, 2-glycidyl glycidyl ether, fumed silica and BYK-310 to a mixer, control the stirring rate to 300 r / min, and mechanically stir and mix them evenly, then add BYK-052N to the mixer, stir for 20 minutes, and let it stand for 20 minutes to defoam, to form a premix;

[0055] Step 3: Add the curing agent to the premix, stir evenly, discharge the material, and store it at room temperature to obtain the sound insulation coating.

[0056] The epoxy resin used is E44 epoxy resin; the preparation method of the functional additive is shown in Preparation Example 1; the curing agent is hexahydrophthalic anhydride, and the following are the same.

[0057] Example 2

[0058] A high-performance sound insulation coating is prepared from the following raw materials measured in parts by weight:

[0059] Epoxy resin 56 parts;

[0060] 5.5 parts of functional additives;

[0061] 6 parts of calcium carbonate;

[0062] 10 parts of 3,4-epoxycyclohexanecarboxylate;

[0063] 30 parts of curing agent;

[0064] 1 part of fumed silica;

[0065] BYK-085 1 part;

[0066] BYK-315N 0.8 parts;

[0067] The preparation method comprises the following steps:

[0068] Step 1: Weigh and prepare all components according to their weight;

[0069] Step 2: Add epoxy resin, functional additives, calcium carbonate, 3,4-epoxycyclohexanecarboxylate, fumed silica and BYK-315N into a mixer, control the stirring rate to 40 r / min, and mechanically stir and mix them evenly, then add BYK-085 into the mixer, stir for 20 minutes, and let it stand for 30 minutes to defoam, to form a premix;

[0070] Step 3: Add the curing agent to the premix, stir evenly, discharge the material, and store it at room temperature to obtain the sound insulation coating.

[0071] Example 3

[0072] A high-performance sound insulation coating is prepared from the following raw materials measured in parts by weight:

[0073] Epoxy resin 60 parts;

[0074] 6 parts of functional additives;

[0075] Titanium dioxide 10 parts;

[0076] 3,4-epoxycyclohexanecarboxylate 15 parts;

[0077] 35 parts of curing agent;

[0078] 1.5 parts of fumed silica;

[0079] BYK-085 1.5 parts;

[0080] BYK-315N 1 part;

[0081] The preparation method comprises the following steps:

[0082] Step 1: Weigh and prepare all components according to their weight;

[0083] Step 2: Add epoxy resin, functional additives, titanium dioxide, 3,4-epoxycyclohexanecarboxylate, fumed silica and BYK-315N into a mixer, control the stirring rate to 500 r / min, and mix them evenly with mechanical stirring, then add BYK-085 into the mixer, stir for 10 minutes, and let it stand for 40 minutes to defoam, to form a premix;

[0084] Step 3: Add the curing agent to the premix, stir evenly, discharge the material, and store it at room temperature to obtain the sound insulation coating.

[0085] Comparative Example 1

[0086] A high-performance sound insulation coating is prepared from the following raw materials measured in parts by weight:

[0087] Epoxy resin 56 parts;

[0088] 5.5 parts of clay;

[0089] 6 parts of calcium carbonate;

[0090] 10 parts of 3,4-epoxycyclohexanecarboxylate;

[0091] 30 parts of curing agent;

[0092] 1 part of fumed silica;

[0093] BYK-085 1 part;

[0094] BYK-315N 0.8 parts;

[0095] The preparation method comprises the following steps:

[0096] Step 1: Weigh and prepare all components according to their weight;

[0097] Step 2: Add epoxy resin, clay, calcium carbonate, 3,4-epoxycyclohexanecarboxylate, fumed silica and BYK-315N into a mixer, control the stirring rate to 40 r / min, and mix them evenly with mechanical stirring, then add BYK-085 into the mixer, stir for 20 minutes, and let it stand for 30 minutes to defoam, to form a premix;

[0098] Step 3: Add the curing agent to the premix, stir evenly, discharge the material, and store it at room temperature to obtain the sound insulation coating.

[0099] Comparative Example 2

[0100] A high-performance sound insulation coating is prepared from the following raw materials measured in parts by weight:

[0101] Epoxy resin 56 parts;

[0102] 6 parts of calcium carbonate;

[0103] 10 parts of 3,4-epoxycyclohexanecarboxylate;

[0104] 30 parts of curing agent;

[0105] 1 part of fumed silica;

[0106] BYK-085 1 part;

[0107] BYK-315N 0.8 parts;

[0108] The preparation method comprises the following steps:

[0109] Step 1: Weigh and prepare all components according to their weight;

[0110] Step 2: Add epoxy resin, calcium carbonate, 3,4-epoxycyclohexanecarboxylate, fumed silica and BYK-315N into a mixer, control the stirring rate to 40 r / min, and mix them evenly with mechanical stirring, then add BYK-085 into the mixer, stir for 20 minutes, and let it stand for 30 minutes to defoam, to form a premix;

[0111] Step 3: Add the curing agent to the premix, stir evenly, discharge the material, and store it at room temperature to obtain the sound insulation coating.

[0112] Test Case

[0113] According to the standard GB / T 19889.8-2006, a 100 mm floor was selected, and the sound insulation coatings in the embodiments and comparative examples were applied on the floor surface, and the coating thickness was controlled to be 5 mm, and the sound insulation effect test was performed;

[0114] The coatings in the embodiments and comparative examples were made into coating samples that met the specifications. The coatings were tested for impact properties according to the standard GB / T 1732-2020. The results are shown in the following table:

[0115] Normalized impact sound pressure level / dB Impact strength / kg·cm Example 1 ≤59 58.4 Example 2 ≤57 58.9 Example 3 ≤59 58.8 Comparative Example 1 ≤70 51.3 Comparative Example 2 ≤77 46.4

[0116] It can be seen from the test results that the epoxy resin coating modified by the functional additive in Preparation Example 1 of the present invention has significantly better sound insulation effect and excellent impact resistance.

[0117] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas, including the best mode, and also enable any technician in the field to practice the present invention, including making and using any device or system, and implementing any combined method. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The scope of protection of the present invention is defined by the claims and may include other embodiments that can be thought of by those skilled in the art. If these other embodiments have structural elements similar to the literal expression of the claims, or if they include equivalent structural elements that are not substantially different from the literal expression of the claims, then these other embodiments should also be included in the scope of the claims.

[0118] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing a high-performance sound insulation coating, characterized in that: The sound insulation coating is made of the following raw materials measured in parts by weight: Epoxy resin 55-60 parts; 3-6 portions of functional additives; 5-10 parts of inorganic filler; 5-15 parts of diluent; 25-35 parts of curing agent; Thixotropic agent 0.5-1.5 parts; Defoaming agent 0.5-1.5 parts; 0.5-1 part of leveling agent; The preparation method comprises the following steps: Step 1: Weigh and prepare all components according to their weight; Step 2: Add epoxy resin, functional additives, inorganic fillers, diluents, thixotropic agents and leveling agents into a mixer, control the stirring rate to 300-500r / min, mechanically stir and mix evenly, then add the defoamer into the mixer, stir for 10-20min, and let stand for 20-40min to defoam, to form a premix; Step 3: Add the curing agent to the premix, stir evenly, discharge the premix, and store at room temperature to obtain the sound insulation coating; The preparation method of the functional additive comprises the following steps: Step S1, using a silane coupling agent to perform surface functionalization modification on clay to obtain functionalized modified clay; Step S2, ultrasonically dispersing the functionalized modified clay in an ethanol solution with a volume fraction of 60-70% to form a uniform dispersion, then adding the cross-linked maltose and the catalyst to the dispersion, after the addition, raising the temperature to 70-80°C, stirring at a constant temperature for 8-12 hours, stopping heating, and pouring the material into a mold after cooling. After the material is gelled, placing the mold in a freeze dryer, controlling the temperature to -50°C, freeze drying for 24-36 hours, taking it out, and crushing it to obtain the functional additive.

2. The method for preparing a high-performance sound insulation coating according to claim 1, characterized in that: The epoxy resin is any one of bisphenol A epoxy resin and bisphenol F epoxy resin.

3. The method for preparing a high-performance sound insulation coating according to claim 1, characterized in that: In step S1, the silane coupling agent is γ-glycidyloxypropyltrimethoxysilane or γ-glycidyloxypropyltriethoxysilane.

4. The method for preparing a high-performance sound insulation coating according to claim 1, characterized in that: In step S2, the specific preparation method of the cross-linked maltose is as follows: Add maltose to N,N-dimethylformamide, stir and mix evenly, then add alkaline hydroxide aqueous solution, after adding, keep stirring at 50-60°C for 1-2h, then continue to add cross-linking agent, and at the same time increase the temperature to 80-100°C, carry out cross-linking reaction under nitrogen protection for 8-12h, stop heating, remove nitrogen, cool and discharge, and then cross-linked maltose can be obtained.

5. The method for preparing a high-performance sound insulation coating according to claim 4, characterized in that: The alkaline hydroxide is potassium hydroxide or sodium hydroxide; the mass fraction of the alkaline hydroxide aqueous solution is 20-30%.

6. The method for preparing a high-performance sound insulation coating according to claim 4, characterized in that: The cross-linking agent is at least one of 2,2'-dibromodiethyl ether, brominated-triethylene glycol-bromo or brominated-tetraethylene glycol-bromo.

7. The method for preparing a high-performance sound insulation coating according to claim 1, characterized in that: In step S2, the catalyst is boron trifluoride etherate complex.

8. The method for preparing a high-performance sound insulation coating according to claim 1, characterized in that: The inorganic filler is at least one of talc, calcium carbonate or titanium dioxide; the curing agent is an acid anhydride curing agent; the thixotropic agent is fumed silica; the defoaming agent is BYK-052N or BYK-085; and the leveling agent is BYK-310 or BYK-315N.

9. A high-performance sound insulation coating, characterized in that: The method is prepared according to any one of claims 1 to 8.