阅读说明：本技术 一种节能建筑用透光隔热薄膜及制备方法 (Light-transmitting heat-insulating film for energy-saving building and preparation method thereof ) 是由 陈庆 昝航 曾军堂 陈涛 刘超 于 2019-11-29 设计创作，主要内容包括：本发明涉及节能建筑材料技术领域,公开了一种节能建筑用透光隔热薄膜及制备方法。包括如下制备过程：(1)利用硅烷偶联剂制备表面改性玻璃微珠空心球；(2)将表面改性玻璃微珠空心球、甲基丙烯酸甲酯、纳米钛白粉、纳米氧化锡、偶氮二异丁腈先后加入乙醇后雾化干燥,得到复合粉体；(3)先在离型膜表面涂覆压敏胶,然后将复合粉体分散于水性聚氨酯/丙烯酸树脂乳液中,涂敷在压敏胶表面,再贴合聚酯层,热定型,即得到透光性节能建筑用隔热薄膜产品。本发明制得的透光隔热薄膜与普通隔热薄膜相比,隔热粒子玻璃微珠空心球分散均匀,薄膜的透光性能好,同时具有良好的隔热效果,可广泛用于建筑玻璃贴膜。(The invention relates to the technical field of energy-saving building materials, and discloses a light-transmitting heat-insulating film for an energy-saving building and a preparation method thereof. The preparation method comprises the following preparation processes: (1) preparing surface modified glass microsphere hollow spheres by using a silane coupling agent; (2) sequentially adding ethanol into the surface-modified glass microsphere hollow sphere, methyl methacrylate, nano titanium dioxide, nano tin oxide and azodiisobutyronitrile, and then carrying out atomization drying to obtain composite powder; (3) firstly coating pressure-sensitive adhesive on the surface of a release film, then dispersing the composite powder in aqueous polyurethane/acrylic resin emulsion, coating the pressure-sensitive adhesive on the surface, then attaching a polyester layer, and carrying out heat setting to obtain the light-transmitting energy-saving building heat-insulating film product. Compared with the common heat insulation film, the light-transmitting heat insulation film prepared by the invention has the advantages that the heat insulation particle glass bead hollow spheres are uniformly dispersed, the light-transmitting performance of the film is good, and meanwhile, the heat insulation effect is good, so that the light-transmitting heat insulation film can be widely used for building glass films.)

1. A preparation method of a light-transmitting heat-insulating film for an energy-saving building is characterized by comprising the following specific steps:

(1) adding the submicron-sized glass microsphere hollow spheres and a silane coupling agent into a high-speed mixer, heating, stirring at a high speed, dispersing, cooling, and discharging to obtain surface-modified glass microsphere hollow spheres;

(2) adding the surface modified glass microsphere hollow sphere obtained in the step (1) and methyl methacrylate into ethanol, dispersing for 10-20 min, adding nano titanium dioxide and nano tin oxide, introducing nitrogen for protection, adding azobisisobutyronitrile under high-speed stirring, heating to 70 ℃, keeping the temperature for 30-40 min, then carrying out atomization drying by adopting high-pressure nitrogen, and further initiating polymerization of reaction liquid in the atomization process to obtain transparent polymethyl methacrylate coated glass microsphere hollow sphere composite powder;

(3) firstly coating a pressure-sensitive adhesive on the surface of a release film, then dispersing the transparent coated composite powder obtained in the step (2) into the aqueous polyurethane/acrylic resin emulsion, uniformly stirring, coating on the surface of the pressure-sensitive adhesive, then attaching a polyester layer, and carrying out heat setting to obtain the light-transmitting energy-saving building heat-insulating film product.

2. The preparation method of the light-transmitting heat-insulating film for the energy-saving building according to claim 1, characterized in that: the silane coupling agent in the step (1) is one of an aminosilane coupling agent and an epoxy silane coupling agent; the amino silane coupling agent is at least one of gamma-aminopropyl triethoxysilane, gamma-aminopropyl trimethoxysilane, aniline methyl triethoxysilane and aniline methyl trimethoxysilane; the epoxy silane coupling agent is gamma- (2, 3-epoxy propoxy) propyl trimethoxy silane.

3. The preparation method of the light-transmitting heat-insulating film for the energy-saving building according to claim 1, characterized in that: the adding amount of the silane coupling agent in the step (1) is 0.8-1.5% of the mass of the glass microsphere hollow sphere.

4. The preparation method of the light-transmitting heat-insulating film for the energy-saving building according to claim 1, characterized in that: the heating temperature of the high-speed mixer in the step (1) is 80-110 ℃, the stirring speed is 600-1200 r/min, and the dispersion time is 30-60 min.

5. The preparation method of the light-transmitting heat-insulating film for the energy-saving building according to claim 1, characterized in that: the raw materials in the step (2) comprise, by mass, 20-30% of the surface-modified glass microsphere hollow sphere, 3-5% of methyl methacrylate, 59.96-73.98% of ethanol, 2-3% of nano titanium dioxide, 1-2% of nano tin oxide and 0.02-0.04% of azobisisobutyronitrile.

6. The preparation method of the light-transmitting heat-insulating film for the energy-saving building according to claim 1, characterized in that: and (3) carrying out atomization drying in the step (2) at the nitrogen pressure of 35-40 MPa and the temperature of 90-100 ℃.

7. The preparation method of the light-transmitting heat-insulating film for the energy-saving building according to claim 1, characterized in that: the coating process in the step (3) adopts one of printing, roller coating, spraying and blade coating; the printing is carried out by adopting nylon wires or polyester wires for silk-screen printing coating; the roller coating adopts a reverse roller coating machine with the coating speed of 150m/min, and the circumferential speed ratio of the coating roller to the supporting roller is 1: 2; the spraying is carried out by adopting compressed air with the pressure of 0.3-0.5 MPa for air spraying.

8. The preparation method of the light-transmitting heat-insulating film for the energy-saving building according to claim 1, characterized in that: in the aqueous polyurethane/acrylic resin emulsion in the step (3), the mass percent of polyurethane resin is 20-24%, and the mass percent of acrylic resin is 12-16%; the transparent coated composite powder accounts for 5-8% of the resin emulsion by mass.

9. The preparation method of the light-transmitting heat-insulating film for the energy-saving building according to claim 1, characterized in that: and (3) performing heat setting at the temperature of 110-120 ℃, and applying the pressure of 0.5-1MPa at the same time, wherein the setting time is 8-10 s.

10. A light-transmitting heat-insulating film for energy-saving buildings, which is prepared by the method of any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of energy-saving building materials, and discloses a light-transmitting heat-insulating film for an energy-saving building and a preparation method thereof.

Background

Building energy consumption accounts for over thirty percent of total energy consumption, and building energy conservation is an important link of energy conservation and emission reduction. According to the data display of the national Ministry of construction and the national building materials statistical office: the total area of public buildings in China is about 45 hundred million meters²99% of the buildings belong to high energy efficiency buildings. The important part of the building energy is energy consumption caused by refrigeration and cooling in summer and heating and heat preservation in winter, in order to reduce the building energy consumption and relieve the energy pressure brought by economic development when global energy is increasingly tense, energy-saving building materials are popularized and popularized comprehensively in China, and besides energy conversion equipment needs to be improved and perfected, the most important method is to adopt effective heat-insulating materials to achieve the aim of energy saving.

At present, glass curtain walls or floor glass doors are available for many buildings, whether walls or windows are good, and the glass doors and windows improve indoor environment, increase indoor temperature and heat, increase air conditioner power consumption, and guarantee the efficacy of the glass doors and windows. In the aspect of how to improve the energy saving of building doors and windows, the glass transformation is the most important of energy saving work, in the energy saving transformation of building doors and windows, the replacement of doors and windows, the direct film pasting and the film coating of glass are effective ways for solving the energy saving problem, and the development and the application of the building glass heat insulation film are more and more concerned in recent years.

The architectural glass film has the greatest advantage that the architectural glass film can be used for energy-saving transformation of existing buildings and can also be used for newly built houses, because the glass film can be easily attached to the existing window glass system, and any expensive equipment does not need to be added. Because the building heat insulation film needs to simultaneously meet two indexes, namely low heat conductivity coefficient and light transmittance, in recent years, the development of organic-inorganic composite technology provides a new idea for people, and the purpose is realized by utilizing the advantage complementation of organic and inorganic properties, but the defect is that the improvement of one property of the composite material is usually obtained by sacrificing other properties, so the research on the building heat insulation film with excellent comprehensive properties becomes a popular topic.

Chinese patent application No. 201110033807.1 discloses a light-transmitting heat-insulating film, a preparation method and application thereof. The transparent heat-insulating film of the invention comprises a resin matrix and modified SiO uniformly dispersed therein₂Hollow sphere particles of, wherein SiO is modified₂The hollow sphere particles are water-soluble and positively charged submicron SiO₂The resin matrix of the hollow sphere particles is aqueous polyurethane latex or acrylic resin emulsion.

Chinese patent application No. 201110033807.1 discloses a light-transmitting heat-insulating film, a preparation method and application thereof. The light-transmitting heat-insulating film comprises a resin matrix and modified glass bead hollow sphere particles uniformly dispersed in the resin matrix, wherein the modified glass bead hollow sphere particles are water-soluble and positively-charged submicron glass bead hollow sphere particles, and the resin matrix is aqueous polyurethane emulsion or acrylic resin emulsion.

The Chinese patent application No. 200810112232.0 discloses a silica hollow sphere/polymer composite heat-insulating material and a preparation method thereof, the composite material comprises a polymer matrix and submicron, non-agglomeration and monodisperse silica hollow spheres uniformly dispersed in the matrix, the polymer matrix is a matrix of epoxy, polyurethane or polyethylene terephthalate, the submicron silica hollow spheres have a hollow inner diameter of 100-720 nm and an outer wall thickness of 50-100 nm, and the submicron silica hollow spheres account for 1-35 wt% of the weight of the polymer matrix. The hollow spheres of the monodisperse silicon dioxide are dispersed in a matrix of a high molecular polymer, so that the composite material has a good heat insulation effect, the polymer used in the composite material comprises epoxy, polyurethane or polyethylene terephthalate, wherein the polyurethane is a water-insoluble polyurethane monomer, the modified silicon dioxide has strong hydrophobicity, and the polyurethane monomer and the hollow spheres of the modified silicon dioxide are subjected to in-situ reaction to obtain the composite material.

According to the above, in the method for preparing the building heat insulation film by using the organic-inorganic composite technology in the existing scheme, due to the poor dispersibility of the used porous heat insulation filler, the problems of poor light transmittance and poor compatibility exist, the invention provides the light-transmitting heat insulation film for the energy-saving building and the preparation method thereof, and the technical problems can be effectively solved.

Disclosure of Invention

At present, widely applied building heat insulation films need to meet the indexes of low heat conductivity coefficient and high light transmittance at the same time, and the problems of poor light transmittance and poor compatibility of the films are caused by poor dispersibility of the added porous heat insulation filler when the building heat insulation films are prepared by using an organic-inorganic composite technology.

The invention achieves the above purpose by the following technical scheme:

a preparation method of a light-transmitting heat-insulating film for an energy-saving building comprises the following specific steps:

(1) adding the submicron-sized glass microsphere hollow spheres and a silane coupling agent into a high-speed mixer, heating, stirring at a high speed, dispersing, cooling, and discharging to obtain surface-modified glass microsphere hollow spheres;

(2) adding the surface modified glass microsphere hollow sphere obtained in the step (1) and methyl methacrylate into ethanol, dispersing for 10-20 min, adding nano titanium dioxide and nano tin oxide, introducing nitrogen for protection, adding azobisisobutyronitrile under high-speed stirring, heating to 70 ℃, keeping the temperature for 30-40 min, then carrying out atomization drying by adopting high-pressure nitrogen, and further initiating polymerization of reaction liquid in the atomization process to obtain transparent polymethyl methacrylate coated glass microsphere hollow sphere composite powder;

(3) firstly coating a pressure-sensitive adhesive on the surface of a release film, then dispersing the transparent coated composite powder obtained in the step (2) into the aqueous polyurethane/acrylic resin emulsion, uniformly stirring, coating on the surface of the pressure-sensitive adhesive, then attaching a polyester layer, and carrying out heat setting to obtain the light-transmitting energy-saving building heat-insulating film product.

The submicron-sized glass bead hollow sphere has good heat-insulating property due to unique characteristics, and is an excellent filler used as a light-transmitting heat-insulating film of a building. However, the submicron-sized glass microsphere hollow sphere is small in particle size, large in specific surface area and specific surface energy, and easy to adsorb and agglomerate, and the heat insulation and light transmission performance of the film is influenced, so that the dispersibility of the glass microsphere hollow sphere is improved by adopting a surface coating modification method. In order to ensure the coating modification effect of the glass microsphere hollow sphere, the silane coupling agent is firstly selected to carry out surface modification on the glass microsphere hollow sphere, so that organic functional groups are bonded on the surface of the glass microsphere hollow sphere, the coupling with a coating modification substance is facilitated, and the modification effect is improved. Preferably, the silane coupling agent in the step (1) is one of an aminosilane coupling agent and an epoxy silane coupling agent; the amino silane coupling agent is at least one of gamma-aminopropyl triethoxysilane, gamma-aminopropyl trimethoxysilane, aniline methyl triethoxysilane and aniline methyl trimethoxysilane; the epoxy silane coupling agent is gamma- (2, 3-epoxy propoxy) propyl trimethoxy silane; the adding amount of the silane coupling agent is 0.8-1.5% of the mass of the glass microsphere hollow sphere.

Preferably, the heating temperature of the high-speed mixer in the step (1) is 80-110 ℃, the stirring speed is 600-1200 r/min, and the dispersion time is 30-60 min.

According to the invention, the surface of the surface-modified glass bead hollow sphere is subjected to spray heat-initiated polymerization reaction, and the outer layer of the glass bead hollow sphere is coated with a layer of transparent polymethyl methacrylate in situ, so that the dispersibility of the glass bead hollow sphere can be effectively improved, the polymethyl methacrylate has good chemical stability and good light transmittance, and the polymerization reaction of a spray heat method is carried out under high-pressure nitrogen gas, so that the coating obtained by in situ polymerization is more uniform. Meanwhile, the nano titanium dioxide and the nano tin oxide are added in the polymerization reaction, have good infrared reflection function and can be used as infrared blocking filler, and the dispersed nano titanium dioxide and the nano tin oxide are firmly coated on the outer layer of the glass microsphere hollow sphere, so that the good infrared blocking and heat insulation effects can be further exerted. Preferably, the raw materials in the step (2) comprise, by mass, 20-30% of the surface-modified glass microsphere hollow sphere, 3-5% of methyl methacrylate, 59.96-73.98% of ethanol, 2-3% of nano titanium dioxide, 1-2% of nano tin oxide and 0.02-0.04% of azodiisobutyronitrile; the pressure of the nitrogen for atomization drying is 35-40 MPa, and the temperature is 90-100 ℃.

The transparent polymethyl methacrylate coated glass bead hollow sphere composite powder prepared by the invention can be uniformly dispersed in aqueous polyurethane/acrylic resin emulsion to serve as a heat-insulating functional coating liquid and is coated on the surface of a release film with a pressure-sensitive adhesive on the surface, and the pressure-sensitive adhesive can effectively ensure the adhesion and uniformity of the heat-insulating functional coating liquid on the surface of a film material. Preferably, the coating process in the step (3) adopts one of printing, roll coating, spray coating and knife coating; the printing is carried out by adopting nylon wires or polyester wires for silk-screen printing coating; the roller coating adopts a reverse roller coating machine with the coating speed of 150m/min, and the circumferential speed ratio of the coating roller to the supporting roller is 1: 2; the spraying is carried out by air spraying with compressed air with the pressure of 0.3-0.5 MPa; in the aqueous polyurethane/acrylic resin emulsion, the mass percent of polyurethane resin is 20-24%, and the mass percent of acrylic resin is 12-16%; the mass percentage of the transparent coating type composite powder in the resin emulsion is 5-8%.

Preferably, the heat setting temperature in the step (3) is 110-120 ℃, and the pressure of 0.5-1MPa is applied at the same time, and the setting time is 8-10 s.

The light-transmitting heat-insulating film for the energy-saving building, which is prepared by the method, has a good heat-insulating effect and good light-transmitting performance, and can be widely used for building glass films. Through tests, the visible light transmittance of the prepared light-transmitting heat-insulating film is 87-91%.

The invention provides a light-transmitting heat-insulating film for an energy-saving building and a preparation method thereof.A submicron glass bead hollow sphere and a silane coupling agent are subjected to high-speed dispersion treatment to obtain a coupled glass bead hollow sphere; dispersing the coupled glass microsphere hollow sphere and methyl methacrylate in ethanol, then dispersing and adding nano titanium dioxide and nano tin oxide, stirring at a high speed under the protection of nitrogen, adding azodiisobutyronitrile, carrying out heat preservation, then carrying out atomization drying by using high-pressure nitrogen, atomizing the reaction liquid, and further initiating polymerization to obtain transparent polymethyl methacrylate coated glass microsphere hollow sphere composite powder; coating a pressure-sensitive adhesive on the surface of a release film, dispersing the obtained transparent coated glass bead hollow spheres into a water-based polyurethane/acrylic resin emulsion, uniformly stirring, and coating the surface of the pressure-sensitive adhesive; further attaching polyester and heat setting.

The invention provides a light-transmitting heat-insulating film for an energy-saving building and a preparation method thereof, compared with the prior art, the light-transmitting heat-insulating film has the outstanding characteristics and excellent effects that:

1. provides a method for preparing a light-transmitting heat-insulating film for an energy-saving building by coating a modified glass microsphere hollow sphere.

2. The transparent polymethyl methacrylate is coated on the outer layer of the glass bead hollow sphere in situ through spray thermal initiation, the coating layer has good chemical stability and light transmission, the dispersity of the heat-insulating particle glass bead hollow sphere is improved, the agglomeration of the glass bead hollow sphere can be avoided, and the light transmission performance of the film is further improved.

3. The nano titanium dioxide and the nano tin oxide which are dispersed in the coating modification of the glass microsphere hollow sphere are firmly coated on the outer layer of the glass microsphere hollow sphere, so that the nano titanium dioxide and the nano tin oxide are better dispersed, a good infrared ray blocking function is exerted, solar radiation heat is reduced, and the heat insulation efficiency is improved.

Drawings

FIG. 1 is a graph showing the rise of temperature in a test chamber with time in the heat insulation test of examples 1 to 5 and comparative example 1.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.