A damping coating for home decoration based on microporous structure silicone copolymer composite microspheres

Abstract

The present invention belongs to the field of functional polymer composite materials, and particularly relates to a damping coating for home decoration based on microporous structure silicone copolymer composite microspheres. The silicone copolymer composite microspheres containing microporous structures are introduced as functional fillers into the silicone-acrylic emulsion to prepare an interior wall coating for buildings with damping functions. Under the synergistic action of glass hollow microspheres, mica powder, functional microporous copolymer microspheres, and a silicone-acrylic polymer matrix, etc., it has strong noise absorption damping performance in a relatively wide temperature range. This kind of functional coating has a simple and easy preparation process, low cost, environmental friendliness, and strong damping performance, meeting the requirements for home decoration use.

Description

Technical Field

[0001] The present invention belongs to the field of functional polymer composite materials, and particularly relates to a damping coating for home decoration based on microporous structure siloxane copolymer composite microspheres. Background Art

[0002] With the rapid development of science and technology, the problem of noise pollution has become the focus of attention in daily life and all walks of life. In the fields of architecture and home decoration, etc., the use of functional materials has been increasingly strengthened on the premise of meeting the requirements of aesthetics and comfort in use. Typically, for damping and noise reduction functional coatings, how to reduce the impact of external environmental noise on the interior of buildings and maintain relative quietness indoors has always been a research hotspot in the architectural coatings industry. Therefore, the use of functional damping and noise reduction materials can effectively improve the sound insulation performance of buildings and thus improve the comfort of the living environment. Damping functional architectural coatings can consume noise sound waves through the internal friction of the molecular motion of polymers, the interaction between polymers and functional fillers, etc. on the premise of protecting the wall, maintain indoor quietness and provide a comfortable living environment. Damping coatings for architecture and home decoration are an effective way to reduce noise pollution and improve environmental comfort, and play an increasingly important role in modern life. In addition, damping coatings also have a certain heat insulation effect, which also has a positive effect on room temperature regulation, energy conservation and emission reduction.

[0003] Currently, damping materials generally convert vibration energy or sound waves into heat energy through molecular motion to achieve the purpose of noise reduction. Most are composed of a polymer matrix with a glass transition temperature close to the use temperature and a functional filler. Hollow glass microspheres are often used as the functional filler, and their hollow structure is beneficial to the consumption of sound waves by the composite material. However, too much filler is likely to cause phase separation and reduce the comprehensive performance of the composite material. Developing new functional organic / inorganic hybrid composite fillers is an effective way to solve this problem. Summary of the Invention

[0004] The purpose of the present invention is to provide a damping coating for home decoration based on microporous structure siloxane copolymer composite microspheres. Using microporous structure siloxane copolymer composite microspheres as the functional filler, it has damping function, certain noise reduction and heat insulation performance, realizes the multi-functionality of the damping coating, and at the same time achieves the purpose of noise reduction by using a green and environmentally friendly simple method.

[0005] In order to achieve the purpose of the present invention, the technical solution adopted is: a damping coating for home decoration based on microporous structure siloxane copolymer composite microspheres, comprising the following mass components: 38 - 55% of silicon-acrylic emulsion, 15 - 22% of microporous structure siloxane copolymer composite microspheres, 20 - 36% of functional filler, 4% of additives, and the balance is water;

[0006] The glass transition temperature T of the silicon-acrylic emulsion g is: -15°C ≤ Tg ≤75℃;

[0007] The above-mentioned siloxane copolymer composite microspheres with microporous structure are a copolymer of acryloxypolysiloxane ester, styrene and methacrylate, etc., and hollow silica, wherein the methacrylate is one or more of methyl methacrylate, ethyl methacrylate and butyl methacrylate. The porous cross-linked copolymer composite microspheres can be prepared by existing methods.

[0008] The specific steps include:

[0009] (1) Add acrylated polysiloxane, methacryloyloxypropyl trimethoxysilane, styrene, methacrylate, hydrophobic hollow silica, and azobisisobutyronitrile in a ratio of 1.2-2 g: 0.4 ml: 4 ml: 5 ml: 0.6 g: 0.3 g to distilled water containing polyvinyl alcohol, stir the mixture to mix thoroughly at room temperature (about 1 hour), and perform suspension polymerization at 75°C for 6 hours, and then purify and dry (specifically, the product is washed with deionized water 2-3 times and vacuum dried at 60°C) to obtain porous cross-linked copolymer composite microspheres.

[0010] Furthermore, the particle size D of the porous cross-linked copolymer composite microspheres is: 20 μm≤D≤80 μm.

[0011] Furthermore, the functional filler is a mixture of mica powder and hollow glass microspheres, and the mass ratio of the mica powder to the hollow glass microspheres is 4-6:8-3.

[0012] Furthermore, the particle sizes of the mica powder and hollow glass microspheres are no greater than 50 μm.

[0013] Furthermore, the above-mentioned auxiliary agents include dispersants, defoamers, preservatives and film-forming agents.

[0014] Furthermore, the mass ratio of the above-mentioned dispersant, defoaming agent, preservative and film-forming aid is: 1:1:1:1, the dispersant is a polycarboxylate sodium salt dispersant; the defoaming agent is a silicone oil; the preservative is an isothiazolinone derivative; and the film-forming aid is an alcohol ester.

[0015] The present invention also provides a method for preparing the damping coating for home decoration based on the microporous structure siloxane copolymer composite microspheres, comprising the following steps:

[0016] (1) Mix the functional filler, dispersant, defoamer and preservative evenly;

[0017] (2) Adding silicone-acrylic emulsion, film-forming aid and porous copolymer composite microspheres to the mixture in step (1), adjusting the pH value to between 7.3 and 8.0, and then stirring the mixture to obtain a damping coating.

[0018] The beneficial effects of the present invention are as follows:

[0019] (1) A damping coating for home decoration according to the present invention uses porous copolymer composite microspheres, hollow glass microspheres and mica powder prepared from acrylated polysiloxane, methacryloxypropyltrimethoxysilane, styrene, methacrylate and hydrophobic hollow silica in specific proportions as the main functional fillers, and silicone-acrylic emulsion as the matrix, endowing the coating with a large number of pore structures. The internal friction generated by the movement of the polymer chains of the composite microspheres can effectively absorb environmental noise and play a role in damping and vibration reduction;

[0020] (2) The porous copolymer composite microspheres used in the present invention itself have strong damping performance, and the organic / inorganic hybrid structure and the matrix can generate strong interaction to improve the system compatibility.

[0021] (3) The porous copolymer composite microspheres and hollow glass microspheres used in the present invention also play a heat insulation role to a certain extent, which is beneficial to room temperature adjustment. Description of the Drawings

[0022] Figure 1 It is the infrared spectrum of the cross-linked polymer microspheres in the examples. Detailed Embodiments

[0023] The present invention will be described in detail below in conjunction with the examples.

[0024] In the following examples, the concentration of the silicone-acrylic emulsion is 46±1% (wt%), and the glass transition temperature T g is 35°C.

[0025] Example 1

[0026] (1) 1.2 g of acrylated polysiloxane, 0.4 mL of methacryloxypropyltrimethoxysilane, 4 mL of styrene, 5 mL of methacrylate, 0.6 g of hydrophobic hollow nano-silica, and 0.3 g of azobisisobutyronitrile were added to 100 mL of distilled water containing 1.5 g of polyvinyl alcohol. The mixture was stirred at 800 rpm for 1 hour at room temperature and subjected to suspension polymerization at 75°C for 6 h. The product was washed 2-3 times with deionized water and dried in vacuo at 60°C to obtain porous cross-linked copolymer composite microspheres with an average particle size of 25 μm.

[0027] (2) 6 g of mica powder with a particle size of 15 μm, 9 g of hollow glass microspheres with a particle size of 20 μm, 1 g of dispersant, 1 g of defoamer and 1 g of preservative were added to a beaker and stirred at high speed to mix evenly.

[0028] (3) Then, add 40 g of silicone-acrylic emulsion, 14 g of porous cross-linked copolymer composite microspheres, 1 g of film-forming aid, and 16 g of distilled water. After stirring and mixing evenly at high speed, adjust the pH value to 8 with 15% sodium carbonate aqueous solution, and stir evenly again to obtain the damping coating.

[0029] Example 2

[0030] (1) Add 2 g of acrylated polysiloxane, 0.4 mL of methacryloxypropyltrimethoxysilane, 4 mL of styrene, 5 mL of methacrylate, 0.6 g of hydrophobic hollow silica, and 0.3 g of azobisisobutyronitrile to 100 mL of distilled water containing 1.5 g of polyvinyl alcohol. Stir the mixture at 800 rpm for 1 hour at room temperature and perform suspension polymerization at 75 °C for 6 h. Wash the product with deionized water 2 - 3 times and dry it in vacuum at 60 °C to obtain porous cross-linked copolymer composite microspheres with an average particle size of 33 μm.

[0031] (2) Add 7 g of mica powder with a particle size of 15 μm, 12 g of hollow glass microspheres with a particle size of 20 μm, 1 g of dispersant, 1 g of defoamer, and 1 g of preservative to a beaker and stir and mix evenly at high speed.

[0032] (3) Then, add 50 g of silicone-acrylic emulsion, 21 g of porous cross-linked copolymer composite microspheres, 1 g of film-forming aid, and 16 g of distilled water. After stirring and mixing evenly at high speed, adjust the pH value to 8 with 15% sodium carbonate aqueous solution, and stir evenly again to obtain the damping coating.

[0033] Example 3

[0034] (1) The same as step (1) in Example 2. Specifically: Add 2 g of acrylated polysiloxane, 0.4 mL of methacryloxypropyltrimethoxysilane, 4 mL of styrene, 5 mL of methacrylate, 0.6 g of hydrophobic hollow silica, and 0.3 g of azobisisobutyronitrile to 100 mL of distilled water containing 1.5 g of polyvinyl alcohol. Stir the mixture at 800 rpm for 1 hour at room temperature and perform suspension polymerization at 75 °C for 6 h. Wash the product with deionized water 2 - 3 times and dry it in vacuum at 60 °C to obtain porous cross-linked copolymer composite microspheres with an average particle size of 33 μm.

[0035] (2) Add 10 g of mica powder with a particle size of 15 μm, 6 g of hollow glass microspheres with a particle size of 20 μm, 1 g of dispersant, 1 g of defoamer, and 1 g of preservative to a beaker and stir and mix evenly at high speed.

[0036] (3) Then, add 40 g of silicone-acrylic emulsion, 13 g of porous cross-linked copolymer composite microspheres, 1 g of film-forming aid, and 16 g of distilled water. After stirring and mixing evenly at high speed, adjust the pH value to 8 with 15% sodium carbonate aqueous solution, and stir evenly again to obtain the damping coating.

[0037] Comparative Example 1

[0038] (1) Add 20 g of calcium carbonate with a particle size of 80 microns, 6 g of mica powder with a particle size of 15 microns, 11 g of hollow glass microspheres with a particle size of 20 microns, 1 g of dispersant, 1 g of defoamer, and 1 g of preservative into a beaker, and stir at high speed to mix evenly.

[0039] (2) Then add 48 g of silicone-acrylic emulsion, 1 g of film-forming aid, and 16 g of distilled water, stir at high speed to mix evenly, adjust the pH value to 8 with 15% sodium carbonate aqueous solution, and stir evenly again to obtain the coating.

[0040] Comparative Example 2

[0041] (1) The same as step (1) in Example 2. Specifically: Add 2 g of acrylated polysiloxane, 0.2 mL of methacryloxypropyltrimethoxysilane, 4 mL of styrene, 5 mL of methacrylate, 0.6 g of hydrophobic hollow silica, and 0.3 g of azobisisobutyronitrile into 100 mL of distilled water containing 1.5 g of polyvinyl alcohol. Stir the mixture at 800 rpm for 1 hour at room temperature and perform suspension polymerization at 75 °C for 6 h. Wash the product with deionized water 2 - 3 times, and dry it in vacuum at 60 °C to obtain porous cross-linked copolymer composite microspheres with an average particle size of 15 um.

[0042] (2) Add 10 g of mica powder with a particle size of 15 microns, 6 g of hollow glass microspheres with a particle size of 15 microns, 1 g of dispersant, 1 g of defoamer, and 1 g of preservative into a beaker, and stir at high speed to mix evenly.

[0043] (3) Then add 40 g of silicone-acrylic emulsion, 13 g of porous cross-linked copolymer composite microspheres, 1 g of film-forming aid, and 16 g of distilled water, stir at high speed to mix evenly, adjust the pH value to 8 with 15% sodium carbonate aqueous solution, and stir evenly again to obtain the damping coating.

[0044] Figure 1 For the infrared spectra of the porous cross-linked copolymer microspheres and polysiloxane in the examples, (A) is the infrared spectrum of pure polysiloxane, and (B) is the infrared spectrum of the cross-linked copolymer microspheres. In the figure, at 2963 cm -1 is the stretching vibration absorption peak of -CH2-, and at 1263 cm -1 is the symmetric stretching vibration absorption peak of -SiCH3, and 1000 - 1100 cm -1 is the vibration absorption peak of -Si-O-Si-, and at 878 cm -1 is the characteristic absorption peak of -Si(CH3)2; in (B), in addition to the infrared characteristic absorption peaks of polysiloxane, at 3029, 3063, 3088 cm -1Characteristic absorption peaks of the benzene ring in polystyrene appeared at 1631, 1498, and 1446 cm -1 are the characteristic absorption peaks of the benzene ring skeleton; at the same time, 1724 cm -1 is the characteristic absorption peak of the ester group C=O, indicating that the polymer contains polysiloxane, polystyrene, polymethacrylate, etc.

[0045] Table 1 shows the damping coatings prepared in Comparative Examples 1 to 2 and Examples 1 to 3, and the performance of the two damping coatings and the comparative coating was investigated. From the data in the table, it can be seen that porous cross-linked copolymer composite microspheres were used. Due to the large number of pore structures in the microsphere structure and the chain flexibility of the copolymer being improved by introducing polysiloxane, the internal friction of polymer motion can consume sound waves, and its comprehensive performance such as damping performance is better and meets the usage requirements. Without using porous cross-linked copolymer composite microspheres, the comprehensive performance is relatively poor.

[0046] Table 1: Parameters such as the damping temperature range and loss factor of the coating

[0047]

[0048]

[0049] Inspired by the ideal embodiments of the present invention described above, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A damping coating for home decoration based on microporous structure silicone copolymer composite microspheres, characterized in that, It includes the following mass components: 38-55% silicone acrylic emulsion, 15-22% microporous structure silicone copolymer composite microspheres, 20-36% functional filler, 4% additives, and the balance water; The glass transition temperature T of the silicone-acrylic emulsion g is: -15°C ≤ T g ≤ 75°C; The preparation of siloxane copolymer composite microspheres with microporous structure comprises the following steps: Add acrylated polysiloxane, methacryloyloxypropyl trimethoxysilane, styrene, methacrylate, hydrophobic hollow silica, and azobisisobutyronitrile in a ratio of 1.2-2 g: 0.4 ml: 4 ml: 5 ml: 0.6 g: 0.3 g to distilled water containing polyvinyl alcohol, stir the mixture to mix thoroughly at room temperature, perform suspension polymerization at 70-80 ° C for 4-8 hours, and then purify and dry; The particle size D of the microporous structured siloxane copolymer composite microspheres is: 20 μm≤D≤80 μm; The functional filler is a mixture of mica powder and hollow glass microspheres, and the mass ratio of the mica powder to the hollow glass microspheres is 4-6: 8-3; The particle sizes of the mica powder and hollow glass microspheres are both no greater than 50 μm.

2. The damping coating for home decoration based on the microporous structure silicone copolymer composite microspheres according to claim 1, wherein, The methacrylate is one or more of methyl methacrylate, ethyl methacrylate and butyl methacrylate.

3. The damping coating for home decoration based on the microporous structure silicone copolymer composite microspheres according to claim 1, characterized in that, Suspension polymerization for 6 hours.

4. The damping coating for home decoration based on the microporous structure silicone copolymer composite microspheres according to claim 1, wherein, The above-mentioned auxiliary agents include a dispersant, a defoamer, a preservative and a film-forming auxiliary agent in a mass ratio of 1:1:1:

1.

5. The damping coating for home decoration based on the microporous structure silicone copolymer composite microspheres according to claim 4, characterized in that, The dispersant is a polycarboxylate sodium salt dispersant; the defoaming agent is a silicone oil; the preservative is an isothiazolinone derivative; and the film-forming aid is an alcohol ester.

6. The preparation method of the damping coating for home decoration based on the microporous structure silicone copolymer composite microspheres according to any one of claims 1 to 5, characterized in that, The steps include: (1) Mix the functional filler, dispersant, defoamer and preservative evenly; (2) Add silicone-acrylic emulsion, film-forming aid and porous copolymer composite microspheres in step (1), adjust the pH value to between 7.3 and 8.0, and then stir evenly to obtain a damping coating.

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