Photovoltaic photo-thermal PVT assembly and preparation method thereof

Abstract

The invention discloses a photovoltaic photo-thermal PVT assembly and a preparation method thereof, the photovoltaic photo-thermal PVT assembly comprises photovoltaic glass, two parallel aluminum pipes arranged at intervals and a plurality of micro-channel flat pipes arranged between the two aluminum pipes and communicated with the aluminum pipes, and the aluminum pipes and the micro-channel flat pipes are respectively bonded with the photovoltaic glass in an adhesive mode. According to the invention, the aluminum tube, the micro-channel flat tube and the photovoltaic glass are bonded together in a gluing mode, and the operation mode is simple and efficient; the bi-component polyurethane heat-conducting glue is used for preparing a photovoltaic photo-thermal PVT assembly, the heat conductivity coefficient of the bi-component polyurethane heat-conducting glue reaches 1.5 W / m.k, the flame retardance of the bi-component polyurethane heat-conducting glue with the thickness of 1 mm reaches UL94V-0, the AI3003 / Al3003 shear strength reaches 8 Mpa, the adhesion to materials such as metal, glass and plastic is good, the preparation process is simple, the cost is low, and the application range is wide. And the drawing force between the photovoltaic glass and the aluminum tube and the micro-channel flat tube is not less than 110 N / cm < 2 >.

Description

Technical Field

[0001] The present invention belongs to the field of photovoltaic thermal technology, and specifically relates to a photovoltaic thermal (PVT) component and a preparation method thereof. Background Art

[0002] Currently, there are many forms of photovoltaic thermal components on the market, such as blown type, liquid-cooled plate type, stainless steel welded type, etc. The structure is composed of photovoltaic components combined with corresponding flow channel plates. The production is cumbersome and prone to many adverse phenomena during the production process. The product qualification rate is low and the energy consumption is high. Summary of the Invention

[0003] In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a photovoltaic thermal (PVT) component and a preparation method thereof.

[0004] In order to achieve the above-mentioned purpose and the above-mentioned technical effect, the technical solution adopted by the present invention is:

[0005] A photovoltaic thermal (PVT) assembly comprises photovoltaic glass, two parallel and spaced aluminum tubes, and a plurality of microchannel flat tubes disposed between and connected to the two aluminum tubes. The aluminum tubes and the microchannel flat tubes are respectively bonded to the photovoltaic glass by gluing.

[0006] Furthermore, the outer walls of the aluminum tube and the microchannel flat tube are coated with a two-component polyurethane thermal conductive adhesive, and the aluminum tube and the microchannel flat tube are respectively bonded to the photovoltaic glass through the two-component polyurethane thermal conductive adhesive.

[0007] Furthermore, the microchannel flat tube is made of metal or plastic.

[0008] Furthermore, the two-component polyurethane thermal conductive adhesive is prepared from component A and component B, and component A includes the following components in parts by weight:

[0009] 50-65 parts of aluminum hydroxide

[0010] 10-25 parts of boron nitride

[0011] 5-20 parts castor oil

[0012] 3-8 parts aromatic polyester polyol

[0013] 1-3 parts of 4A molecular sieve

[0014] 1-2 parts of 3A molecular sieve

[0015] 0.5-3 parts of polyamide resin

[0016] 0.3-2 parts of dipropylene glycol

[0017] 0.2-1 parts of polyethylene glycol

[0018] 0.01-0.1 parts of organotin metal catalyst

[0019] 0.05-0.1 parts of blue color paste;

[0020] Component B includes the following components:

[0021] 20-35 parts of isocyanate prepolymer

[0022] 50-75 parts of aluminum hydroxide

[0023] 5-10 parts magnesium oxide

[0024] 1-3 parts dioctyl phthalate

[0025] 0.05-0.5 parts of yellow color paste

[0026] 0.1-0.5 parts of isocyanate dehydrating agent.

[0027] Furthermore, the volume ratio of component A to component B is 1:1.

[0028] Furthermore, the particle sizes of the aluminum hydroxide, boron nitride and magnesium oxide are 2-4 μm respectively.

[0029] Furthermore, the castor oil is first-grade refined castor oil with a hydroxyl value of 165-180 mg KOH / g.

[0030] Furthermore, the aromatic polyester polyol is made of diol and phthalic acid, and has a molecular weight of 700-1500.

[0031] Furthermore, the two-component polyurethane thermal conductive adhesive is prepared by the following steps:

[0032] 1) Preparation of component A

[0033] By weight, 50-65 parts of aluminum hydroxide, 10-25 parts of boron nitride, 5-20 parts of castor oil, 3-8 parts of aromatic polyester polyol, 0.5-3 parts of polyamide resin, 0.3-2 parts of dipropylene glycol, 0.2-1 parts of polyethylene glycol, and 0.01-0.1 parts of an organic tin metal catalyst are placed in a blender, stirred evenly, and then 1-3 parts of 4A molecular sieves, 1-2 parts of 3A molecular sieves, and 0.05-0.1 parts of a blue color paste are added, and stirring is continued to obtain the desired component A.

[0034] 2) Preparation of component B

[0035] By weight, put 20-35 parts of isocyanate prepolymer, 50-75 parts of aluminum hydroxide, 5-10 parts of magnesium oxide, and 1-3 parts of dioctyl phthalate into a blender, stir evenly, then add 0.1-0.5 parts of isocyanate dehydrating agent and 0.05-0.5 parts of yellow color paste, continue stirring evenly to obtain the required component B;

[0036] 3) Mix component A and component B in a volume ratio of 1:1 to make the required two-component polyurethane thermal conductive adhesive.

[0037] The present invention also discloses a method for preparing a photovoltaic thermal (PVT) assembly, comprising the following steps:

[0038] 1) Weld the microchannel flat tube and the aluminum tube together by lead soldering to form a microchannel heat collector with one end entering and the other end exiting;

[0039] 2) Apply two-component polyurethane thermal conductive adhesive to the outer walls of the aluminum tube and the microchannel flat tube, respectively. Then, bond the photovoltaic glass to the outer walls of the aluminum tube and the microchannel flat tube. Place the adhesive in an oven and cure at 70-90°C for 4-10 hours. The pull-out force between the photovoltaic glass and the aluminum tube and the microchannel flat tube must be no less than 110 N / cm2 to meet the requirements.

[0040] 3) Carry out air tightness, pressure bearing and insulation withstand voltage tests. After passing the tests, the product can be shipped or further assembled.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] The present invention discloses a photovoltaic thermal (PVT) component and a preparation method thereof. The aluminum tube and the microchannel flat tube are respectively bonded to the photovoltaic glass by gluing, and the operation is simple and efficient. The photovoltaic thermal (PVT) component can be made using a two-component polyurethane thermal conductive adhesive or other adhesive types. The two-component polyurethane thermal conductive adhesive has a thermal conductivity of 1.5W / mk, a flame retardancy of UL94V-0 at a thickness of 1mm, and an AI3003 / Al3003 shear strength of 8Mpa. It has good adhesion to materials such as metal, stainless steel, glass, and plastic, strong universal bonding, and excellent aging performance. The preparation process is simple and the cost is low. When the thermal conductive adhesive is applied to the photovoltaic thermal component, a pull-out force of not less than 110 N / cm2 can be achieved between the photovoltaic glass and the aluminum tube and the microchannel flat tube, and the air tightness and insulation pressure resistance are good, the product yield is high, and it has a large market space and application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of the microchannel heat collecting plate of the present invention. DETAILED DESCRIPTION

[0044] The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0045] The following is a brief summary of one or more aspects to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceivable aspects and is neither intended to identify key or critical elements of all aspects nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that will be provided later.

[0046] like Figure 1 As shown, the present invention discloses a photovoltaic thermal (PVT) assembly, comprising photovoltaic glass, two parallel and spaced aluminum tubes 1, and a plurality of microchannel flat tubes 2 arranged between the two aluminum tubes 1 and connected to the aluminum tubes 1. The outer walls of the aluminum tubes 1 and the microchannel flat tubes 2 are coated with a two-component polyurethane thermal conductive adhesive or other adhesive types, and the aluminum tubes 1 and the microchannel flat tubes 2 are respectively bonded to the photovoltaic glass by the two-component polyurethane thermal conductive adhesive or other adhesive types.

[0047] In the present invention, the microchannel flat tube 2 can be made of metal, plastic or other materials.

[0048] In the present invention, the two-component polyurethane thermal conductive adhesive is prepared from component A and component B, and the volume ratio of component A to component B is 1:1.

[0049] Component A includes the following components in parts by weight:

[0050] 50-65 parts of aluminum hydroxide

[0051] 10-25 parts of boron nitride

[0052] 5-20 parts castor oil

[0053] 3-8 parts aromatic polyester polyol

[0054] 1-3 parts of 4A molecular sieve

[0055] 1-2 parts of 3A molecular sieve

[0056] 0.5-3 parts of polyamide resin

[0057] 0.3-2 parts of dipropylene glycol

[0058] 0.2-1 parts of polyethylene glycol

[0059] 0.01-0.1 parts of organotin metal catalyst

[0060] 0.05-0.1 parts of blue color paste.

[0061] Component B includes the following components in parts by weight:

[0062] 20-35 parts of isocyanate prepolymer

[0063] 50-75 parts of aluminum hydroxide

[0064] 5-10 parts magnesium oxide

[0065] 1-3 parts dioctyl phthalate

[0066] 0.05-0.5 parts of yellow color paste

[0067] 0.1-0.5 parts of isocyanate dehydrating agent.

[0068] The particle sizes of aluminum hydroxide, boron nitride and magnesium oxide are 2-4 μm respectively.

[0069] The castor oil is first-grade refined castor oil with a hydroxyl value of 165-180 mg KOH / g.

[0070] Aromatic polyester polyols are made from glycols and phthalic acid with a molecular weight of 700-1500.

[0071] The two-component polyurethane thermal conductive adhesive is prepared by the following steps:

[0072] 1) Preparation of component A

[0073] By weight, 50-65 parts of aluminum hydroxide, 10-25 parts of boron nitride, 5-20 parts of castor oil, 3-8 parts of aromatic polyester polyol, 0.5-3 parts of polyamide resin, 0.3-2 parts of dipropylene glycol, 0.2-1 parts of polyethylene glycol, and 0.01-0.1 parts of an organic tin metal catalyst are placed in a blender, stirred evenly, and then 1-3 parts of 4A molecular sieves, 1-2 parts of 3A molecular sieves, and 0.05-0.1 parts of a blue color paste are added, and stirring is continued to obtain the desired component A.

[0074] 2) Preparation of component B

[0075] By weight, put 20-35 parts of isocyanate prepolymer, 50-75 parts of aluminum hydroxide, 5-10 parts of magnesium oxide, and 1-3 parts of dioctyl phthalate into a blender, stir evenly, then add 0.1-0.5 parts of isocyanate dehydrating agent and 0.05-0.5 parts of yellow color paste, continue stirring evenly to obtain the required component B;

[0076] 3) Mix component A and component B in a volume ratio of 1:1 to make the required two-component polyurethane thermal conductive adhesive.

[0077] The two-component polyurethane thermal conductive adhesive provided by the present invention has a thermal conductivity coefficient of up to 1.5W / mk, a flame retardancy of up to UL94V-0 with a thickness of 1mm, an AI3003 / Al3003 shear strength of up to 8Mpa, and a complete cohesive failure pattern. It has good adhesion to materials such as metal, stainless steel, glass, PC, and nylon, strong universal adhesion, excellent aging performance, relatively low preparation cost, and has a large market space and application scenarios.

[0078] The present invention also discloses a method for preparing a photovoltaic thermal (PVT) assembly, comprising the following steps:

[0079] 1) Weld the microchannel flat tube 2 and the aluminum tube 1 together by lead soldering. Several microchannel flat tubes 2 are set between two aluminum tubes 1. The two ends of the microchannel flat tube 2 are respectively connected to the aluminum tube 1 on the same side to form a microchannel heat collector with one end entering and the other end exiting;

[0080] 2) Applying a two-component polyurethane thermally conductive structural adhesive to a thickness of 0.1-1 mm, preferably 0.2 mm, on the outer walls of the aluminum tube 1 and the microchannel flat tube 2, respectively. Then, bonding the photovoltaic glass to the outer walls of the aluminum tube 1 and the microchannel flat tube 2, and curing the adhesive in an oven at 70-90° C. for 4-10 hours. Testing the pull-out force between the photovoltaic glass and the aluminum tube 1 and the microchannel flat tube 2 to be no less than 110 N / cm2 satisfies the requirement.

[0081] 3) Carry out air tightness, pressure bearing and insulation withstand voltage tests. After passing the tests, the product can be shipped or further assembled.

[0082] In the present invention, the width of the microchannel flat tube 2 includes but is not limited to 10 mm, 30 mm, 60 mm, and 80 mm.

[0083] Perform air tightness test to ensure that there is no sand hole leakage in the pipeline.

[0084] A pressure test is performed to ensure that the internal pressure of the microchannel flat tube 2 is not less than 10 kg.

[0085] The insulation withstand voltage test is carried out to ensure that the electrical performance complies with the IEC61215 standard.

[0086] After all the above tests are completed, thermal insulation materials can be installed according to actual needs to insulate the microchannel flat tubes 2. After the thermal insulation materials are installed, a finished product is formed. The thermal insulation materials can also be omitted.

[0087] Example 1

[0088] like Figure 1As shown, a photovoltaic thermal (PVT) assembly includes photovoltaic glass, two parallel and spaced aluminum tubes 1, and a plurality of microchannel flat tubes 2 arranged between the two aluminum tubes 1 and connected to the aluminum tubes 1. The outer walls of the aluminum tubes 1 and the microchannel flat tubes 2 are coated with a two-component polyurethane thermal conductive adhesive, and the aluminum tubes 1 and the microchannel flat tubes 2 (made of conventional plastic) are respectively bonded to the photovoltaic glass by the two-component polyurethane thermal conductive adhesive.

[0089] The two-component polyurethane thermal conductive adhesive is prepared from component A and component B, and the volume ratio of component A to component B is 1:1.

[0090] Component A includes the following components in parts by weight:

[0091] 65 parts of aluminum hydroxide

[0092] 10 parts of boron nitride

[0093] 5 parts castor oil

[0094] 3 parts aromatic polyester polyol

[0095] 1 part 4A molecular sieve

[0096] 1 part 3A molecular sieve

[0097] 0.5 parts of polyamide resin

[0098] 0.3 parts of dipropylene glycol

[0099] 0.2 parts of polyethylene glycol

[0100] 0.01 part of organotin metal catalyst

[0101] 0.05 parts of blue color paste.

[0102] Component B includes the following components in parts by weight:

[0103] 35 parts of isocyanate prepolymer

[0104] 50 parts of aluminum hydroxide

[0105] 5 parts of magnesium oxide

[0106] 1 part dioctyl phthalate

[0107] 0.05 parts of yellow color paste

[0108] 0.1 part of isocyanate dehydrating agent.

[0109] The particle sizes of aluminum hydroxide, boron nitride, and magnesium oxide are 3 μm, respectively.

[0110] The castor oil is first-grade refined castor oil with a hydroxyl value of 180 mg KOH / g.

[0111] Aromatic polyester polyol is made from glycol and phthalic acid with a molecular weight of 700.

[0112] The two-component polyurethane thermal conductive adhesive is prepared by the following steps:

[0113] 1) Preparation of component A

[0114] By weight, 65 parts of aluminum hydroxide, 10 parts of boron nitride, 5 parts of castor oil, 3 parts of aromatic polyester polyol, 0.5 parts of polyamide resin, 0.3 parts of dipropylene glycol, 0.2 parts of polyethylene glycol, and 0.01 parts of an organic tin metal catalyst were put into a blender, stirred evenly, and then 1 part of 4A molecular sieve, 1 part of 3A molecular sieve, and 0.05 parts of a blue color paste were added, and stirring was continued to obtain the desired component A.

[0115] 2) Preparation of component B

[0116] By weight, 35 parts of isocyanate prepolymer, 50 parts of aluminum hydroxide, 5 parts of magnesium oxide, and 1 part of dioctyl phthalate were placed in a blender, stirred evenly, and then 0.1 parts of isocyanate dehydrating agent and 0.05 parts of yellow color paste were added, and continued to stir evenly to obtain the required component B.

[0117] 3) Component A and component B are mixed evenly in a volume ratio of 1:1 to prepare the desired two-component polyurethane thermal adhesive. A method for preparing a photovoltaic thermal (PVT) component comprises the following steps:

[0118] 1) Weld the microchannel flat tube 2 and the aluminum tube 1 together by lead soldering. Several microchannel flat tubes 2 are set between two aluminum tubes 1. The two ends of the microchannel flat tube 2 are respectively connected to the aluminum tube 1 on the same side to form a microchannel heat collector with one end entering and the other end exiting;

[0119] 2) Apply a two-component polyurethane thermally conductive structural adhesive to the outer walls of the aluminum tube 1 and the microchannel flat tube 2, respectively, with a thickness of 0.2 mm. Then, bond the photovoltaic glass to the outer walls of the aluminum tube 1 and the microchannel flat tube 2. Place the adhesive in an oven and cure at 80°C for 4 hours. The pull-out force between the photovoltaic glass and the aluminum tube 1 and the microchannel flat tube 2 must be no less than 110 N / cm2 to meet the requirements.

[0120] 3) Carry out air tightness, pressure bearing and insulation withstand voltage tests. After passing the tests, the product can be shipped or further assembled.

[0121] In the present invention, the width of the microchannel flat tube 2 is 10 mm.

[0122] Perform air tightness test to ensure that there is no sand hole leakage in the pipeline.

[0123] A pressure test is performed to ensure that the internal pressure of the microchannel flat tube 2 is not less than 10 kg.

[0124] The insulation withstand voltage test is carried out to ensure that the electrical performance complies with the IEC61215 standard.

[0125] After all the above tests are completed, thermal insulation materials can be installed according to actual needs to insulate the microchannel flat tubes 2. After the thermal insulation materials are installed, a finished product is formed.

[0126] Example 2

[0127] like Figure 1 As shown, a photovoltaic thermal (PVT) assembly includes photovoltaic glass, two parallel and spaced aluminum tubes 1, and a plurality of microchannel flat tubes 2 arranged between the two aluminum tubes 1 and connected to the aluminum tubes 1. The outer walls of the aluminum tubes 1 and the microchannel flat tubes 2 are coated with a two-component polyurethane thermal conductive adhesive, and the aluminum tubes 1 and the microchannel flat tubes 2 are respectively bonded to the photovoltaic glass through the two-component polyurethane thermal conductive adhesive.

[0128] The two-component polyurethane thermal conductive adhesive is prepared from component A and component B, and the volume ratio of component A to component B is 1:1.

[0129] Component A includes the following components in parts by weight:

[0130] 50 parts of aluminum hydroxide

[0131] 25 parts of boron nitride

[0132] 20 parts castor oil

[0133] 8 parts aromatic polyester polyol

[0134] 3 parts of 4A molecular sieve

[0135] 2 parts of 3A molecular sieve

[0136] 3 parts polyamide resin

[0137] 2 parts of dipropylene glycol

[0138] 1 part polyethylene glycol

[0139] 0.1 part of organotin metal catalyst

[0140] 0.1 parts of blue color paste.

[0141] Component B includes the following components in parts by weight:

[0142] 20 parts of isocyanate prepolymer

[0143] 75 parts of aluminum hydroxide

[0144] 10 parts of magnesium oxide

[0145] 3 parts of dioctyl phthalate

[0146] 0.5 parts of yellow color paste

[0147] 0.5 parts of isocyanate dehydrating agent.

[0148] The two-component polyurethane thermal conductive adhesive is prepared by the following steps:

[0149] 1) Preparation of component A

[0150] By weight, 50 parts of aluminum hydroxide, 25 parts of boron nitride, 20 parts of castor oil, 8 parts of aromatic polyester polyol, 3 parts of polyamide resin, 2 parts of dipropylene glycol, 1 part of polyethylene glycol, and 0.1 part of an organic tin metal catalyst were put into a blender, stirred evenly, and then 3 parts of 4A molecular sieve, 2 parts of 3A molecular sieve, and 0.1 part of a blue color paste were added, and stirring was continued to obtain the desired component A.

[0151] 2) Preparation of component B

[0152] By weight, 20 parts of isocyanate prepolymer, 75 parts of aluminum hydroxide, 10 parts of magnesium oxide, and 3 parts of dioctyl phthalate are placed in a blender, stirred evenly, and then 0.5 parts of isocyanate dehydrating agent and 0.5 parts of yellow color paste are added, and stirring is continued to obtain the required component B.

[0153] 3) Component A and component B are mixed evenly in a volume ratio of 1:1 to prepare the desired two-component polyurethane thermal adhesive. A method for preparing a photovoltaic thermal (PVT) component comprises the following steps:

[0154] 1) Weld the microchannel flat tube 2 and the aluminum tube 1 together by lead soldering. Several microchannel flat tubes 2 are set between two aluminum tubes 1. The two ends of the microchannel flat tube 2 are respectively connected to the aluminum tube 1 on the same side to form a microchannel heat collector with one end entering and the other end exiting;

[0155] 2) Apply a two-component polyurethane thermally conductive structural adhesive to the outer walls of the aluminum tube 1 and the microchannel flat tube 2, respectively, with a thickness of 0.4 mm. Then, bond the photovoltaic glass to the outer walls of the aluminum tube 1 and the microchannel flat tube 2. Place the adhesive in an oven and cure at 75°C for 5 hours. The pull-out force between the photovoltaic glass and the aluminum tube 1 and the microchannel flat tube 2 must be no less than 110 N / cm2 to meet the requirements.

[0156] 3) Carry out air tightness, pressure bearing and insulation withstand voltage tests. After passing the tests, the product can be shipped or further assembled.

[0157] In the present invention, the width of the microchannel flat tube 2 includes but is not limited to 10 mm.

[0158] Perform air tightness test to ensure that there is no sand hole leakage in the pipeline.

[0159] A pressure test is performed to ensure that the internal pressure of the microchannel flat tube 2 is not less than 10 kg.

[0160] The insulation withstand voltage test is carried out to ensure that the electrical performance complies with the IEC61215 standard.

[0161] After all the above tests are completed, thermal insulation materials can be installed according to actual needs to insulate the microchannel flat tubes 2. After the thermal insulation materials are installed, a finished product is formed.

[0162] The rest is the same as Example 1.

[0163] Example 3

[0164] like Figure 1 As shown, a photovoltaic thermal (PVT) assembly includes photovoltaic glass, two parallel and spaced aluminum tubes 1, and a plurality of microchannel flat tubes 2 arranged between the two aluminum tubes 1 and connected to the aluminum tubes 1. The outer walls of the aluminum tubes 1 and the microchannel flat tubes 2 are coated with a two-component polyurethane thermal conductive adhesive, and the aluminum tubes 1 and the microchannel flat tubes 2 are respectively bonded to the photovoltaic glass through the two-component polyurethane thermal conductive adhesive.

[0165] The two-component polyurethane thermal conductive adhesive is prepared from component A and component B, and the volume ratio of component A to component B is 1:1.

[0166] Component A includes the following components in parts by weight:

[0167] 55 parts of aluminum hydroxide

[0168] 15 parts of boron nitride

[0169] 10 parts castor oil

[0170] 5 parts of aromatic polyester polyol

[0171] 2 parts of 4A molecular sieve

[0172] 1.5 parts of 3A molecular sieve

[0173] 1 part polyamide resin

[0174] 1 part dipropylene glycol

[0175] 0.5 parts of polyethylene glycol

[0176] 0.08 parts of organotin metal catalyst

[0177] 0.08 parts of blue color paste.

[0178] Component B includes the following components in parts by weight:

[0179] 25 parts of isocyanate prepolymer

[0180] 55 parts of aluminum hydroxide

[0181] 6 parts of magnesium oxide

[0182] 2 parts dioctyl phthalate

[0183] 0.1 parts of yellow color paste

[0184] 0.3 parts of isocyanate dehydrating agent.

[0185] The two-component polyurethane thermal conductive adhesive is prepared by the following steps:

[0186] 1) Preparation of component A

[0187] By weight, 55 parts of aluminum hydroxide, 15 parts of boron nitride, 10 parts of castor oil, 5 parts of aromatic polyester polyol, 1 part of polyamide resin, 1 part of dipropylene glycol, 0.5 parts of polyethylene glycol, and 0.08 parts of an organic tin metal catalyst were put into a blender, stirred evenly, and then 2 parts of 4A molecular sieve, 1.5 parts of 3A molecular sieve, and 0.08 parts of a blue color paste were added, and stirring was continued to obtain the desired component A.

[0188] 2) Preparation of component B

[0189] By weight, 25 parts of isocyanate prepolymer, 55 parts of aluminum hydroxide, 6 parts of magnesium oxide, and 2 parts of dioctyl phthalate are placed in a blender, stirred evenly, and then 0.3 parts of isocyanate dehydrating agent and 0.1 parts of yellow color paste are added, and stirring is continued to obtain the required component B.

[0190] 3) Component A and component B are mixed evenly in a volume ratio of 1:1 to prepare the desired two-component polyurethane thermal adhesive. A method for preparing a photovoltaic thermal (PVT) component comprises the following steps:

[0191] 1) Weld the microchannel flat tube 2 and the aluminum tube 1 together by lead soldering. Several microchannel flat tubes 2 are set between two aluminum tubes 1. The two ends of the microchannel flat tube 2 are respectively connected to the aluminum tube 1 on the same side to form a microchannel heat collector with one end entering and the other end exiting;

[0192] 2) Apply a two-component polyurethane thermally conductive structural adhesive to the outer walls of the aluminum tube 1 and the microchannel flat tube 2, respectively, with a thickness of 0.2 mm. Then, bond the photovoltaic glass to the outer walls of the aluminum tube 1 and the microchannel flat tube 2. Place the adhesive in an oven and cure at 85°C for 4 hours. The pull-out force between the photovoltaic glass and the aluminum tube 1 and the microchannel flat tube 2 must be no less than 110 N / cm2 to meet the requirements.

[0193] 3) Carry out air tightness, pressure bearing and insulation withstand voltage tests. After passing the tests, the product can be shipped or further assembled.

[0194] In the present invention, the width of the microchannel flat tube 2 includes but is not limited to 10 mm.

[0195] Perform air tightness test to ensure that there is no sand hole leakage in the pipeline.

[0196] A pressure test is performed to ensure that the internal pressure of the microchannel flat tube 2 is not less than 10 kg.

[0197] The insulation withstand voltage test is carried out to ensure that the electrical performance complies with the IEC61215 standard.

[0198] After all the above tests are completed, thermal insulation materials can be installed according to actual needs to insulate the microchannel flat tubes 2. After the thermal insulation materials are installed, a finished product is formed.

[0199] The rest is the same as Example 1.

[0200] Parts or structures not specifically described in the present invention may adopt existing technologies or existing products and will not be described in detail here.

[0201] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A photovoltaic thermal (PVT) assembly, characterized in that: The invention comprises photovoltaic glass, two parallel and spaced aluminum tubes and a plurality of microchannel flat tubes arranged between the two aluminum tubes and connected with the aluminum tubes. The aluminum tubes and the microchannel flat tubes are respectively bonded to the photovoltaic glass by gluing.

2. A photovoltaic (PVT) thermal module according to claim 1, characterized in that: The outer walls of the aluminum tube and the microchannel flat tube are coated with two-component polyurethane thermal conductive adhesive, and the aluminum tube and the microchannel flat tube are respectively bonded to the photovoltaic glass through the two-component polyurethane thermal conductive adhesive.

3. A photovoltaic (PVT) thermal module according to claim 1 or 2, characterized in that: The microchannel flat tube is made of metal or plastic.

4. A photovoltaic (PVT) thermal module according to claim 2, characterized in that: The two-component polyurethane thermal conductive adhesive is prepared from component A and component B. Component A includes the following components in parts by weight: Aluminum hydroxide 50-65 parts Boron nitride 10-25 parts 5-20 parts castor oil 3-8 parts of aromatic polyester polyol 4A molecular sieve 1-3 parts 3A molecular sieve 1-2 parts Polyamide resin 0.5-3 parts Dipropylene glycol 0.3-2 parts Polyethylene glycol 0.2-1 part 0.01-0.1 parts of organotin metal catalyst 0.05-0.1 parts of blue color paste; Component B includes the following components: Isocyanate prepolymer 20-35 parts Aluminum hydroxide 50-75 parts 5-10 parts of magnesium oxide 1-3 parts of dioctyl phthalate Yellow color paste 0.05-0.5 parts Isocyanate dehydrating agent 0.1-0.5 parts.

5. A photovoltaic (PVT) thermal module according to claim 4, characterized in that: The volume ratio of component A to component B is 1:

1.

6. A photovoltaic (PVT) thermal module according to claim 4, characterized in that: The particle sizes of the aluminum hydroxide, boron nitride and magnesium oxide are 2-4 μm respectively.

7. A photovoltaic (PVT) thermal module according to claim 4, characterized in that: The castor oil is first-grade refined castor oil, and the hydroxyl value is 165-180 mg KOH / g.

8. A photovoltaic (PVT) thermal module according to claim 4, characterized in that: The aromatic polyester polyol is made of diol and phthalic acid and has a molecular weight of 700-1500.

9. The method for preparing a photovoltaic (PVT) thermal module according to claim 4, characterized in that: The two-component polyurethane thermal conductive adhesive is prepared by the following steps: 1) Preparation of component A By weight, 50-65 parts of aluminum hydroxide, 10-25 parts of boron nitride, 5-20 parts of castor oil, 3-8 parts of aromatic polyester polyol, 0.5-3 parts of polyamide resin, 0.3-2 parts of dipropylene glycol, 0.2-1 parts of polyethylene glycol, and 0.01-0.1 parts of organic tin metal catalyst are put into a blender, and after stirring evenly, 1-3 parts of 4A molecular sieve, 1-2 parts of 3A molecular sieve, and 0.05-0.1 parts of blue color paste are added, and stirring is continued to be evenly obtained to obtain the required component A; 2) Preparation of component B By weight, put 20-35 parts of isocyanate prepolymer, 50-75 parts of aluminum hydroxide, 5-10 parts of magnesium oxide, and 1-3 parts of dioctyl phthalate into a blender, stir evenly, then add 0.1-0.5 parts of isocyanate dehydrating agent and 0.05-0.5 parts of yellow color paste, continue stirring evenly, and the required component B can be obtained; 3) Mix component A and component B in a volume ratio of 1:1 to make the required two-component polyurethane thermal conductive adhesive.

10. A method for preparing a photovoltaic thermal (PVT) component, characterized in that: The following steps are involved: 1) Weld the microchannel flat tube and the aluminum tube together by lead welding to form a microchannel heat collector with one end entering and the other end exiting; 2) Apply two-component polyurethane thermal conductive adhesive to the outer walls of the aluminum tube and the microchannel flat tube respectively, then bond the photovoltaic glass to the outer walls of the aluminum tube and the microchannel flat tube, place in an oven, and cure at a high temperature of 70-90°C for 4-10 hours. Test that the pull-out force between the photovoltaic glass and the aluminum tube and the microchannel flat tube is not less than 110 N / cm2 to meet the requirements; 3) Carry out air tightness, pressure bearing and insulation withstand voltage tests. After passing the tests, the product can be shipped or further assembled.

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