Special butyl self-adhesive waterproof coiled material for metal roof maintenance and production process of special butyl self-adhesive waterproof coiled material

Abstract

The invention provides a butyl self-adhesive waterproof coiled material special for metal roof maintenance and a production process thereof, and the coiled material is composed of the following five layers from top to bottom: a durable waterproof layer, a flexible waterproof layer, a metal enhancement layer, a bonding layer and an isolation layer; the durable waterproof layer is prepared from the following raw material components: polyolefin particles, an antioxidant, titanium dioxide, superfine glass bead powder, magnesium hydroxide, antimony trioxide and a light stabilizer; the flexible waterproof layer is prepared from the following raw material components: polyolefin particles, SEBS (Styrene-Ethylene-Butylene-Styrene), superfine glass bead powder, magnesium hydroxide, EPDM (Ethylene-Propylene-Diene Monomer), an antioxidant, carbon black and zinc oxide. The butyl self-adhesive waterproof coiled material disclosed by the invention has good adhesive property with a metal base surface, is not easy to deform due to temperature change, and has good aging resistance.

Description

Technical Field

[0001] The invention relates to the field of building waterproofing, and in particular to a butyl self-adhesive waterproofing coiled material specially used for metal roof maintenance and a production process thereof. Background Art

[0002] When metal roofs, especially color steel roofs, leak, you can choose asphalt waterproofing membranes and polymer waterproofing membranes when repairing them. There are three forms of polymer waterproofing membranes: one is the empty laying method plus mechanical fixation, one is the full bonding method, and one is the self-adhesive method. There are three types of polymer materials, namely homogeneous sheets, fiber external reinforcement sheets and self-adhesive sheets. Among these three options, self-adhesive sheets are the most common. The existing process of self-adhesive sheets is mostly to fully apply self-adhesive glue on the back of the homogeneous sheet to bond with the repair surface.

[0003] The existing polymer self-adhesive waterproof membrane has the following problems: The dimensional change rate is large. Polymer materials will have a large dimensional change rate under the influence of temperature. When using self-adhesive roll materials for repairs, the roll materials will shrink, causing the roll materials to separate from the base layer, and the material will have large wrinkles, thus affecting the waterproof effect.

[0004] The thicker the self-adhesive membrane is, the greater the stress generated after deformation. It is difficult to achieve full adhesion when laying on some special-shaped roof structures. Even if it is fully adhered during laying, it will slowly fall off under the stress of membrane deformation.

[0005] The reinforcing materials of self-adhesive coils are mostly polymer materials. Due to their poor adhesion to metal materials, it is difficult to use metal materials as reinforcing materials to improve the dimensional stability of the materials. When used for exposure, the coils are easily separated from the metal reinforcing materials due to thermal expansion and contraction.

[0006] The multi-layer structure composite process of self-adhesive coiled materials mostly adopts the form of double machines and double dies, which has low composite strength and poor bonding ability with reinforcing materials.

[0007] After arduous exploration, our team of inventors has solved the following problems existing in the prior art: the stability of the butyl self-adhesive waterproof membrane in the prior art is poor, and changes in temperature can easily lead to deformation, thermal expansion and contraction; the aging resistance of the butyl self-adhesive waterproof membrane is not ideal, and the bonding performance with the metal base surface is poor. Summary of the invention

[0008] In order to solve the above problems existing in the prior art, the present invention provides a butyl self-adhesive waterproof membrane and a production process specially used for metal roof maintenance, and achieves the following invention objectives: improving the stability of the butyl self-adhesive waterproof membrane, reducing the rate of change of the membrane size caused by temperature changes, improving the aging resistance of the waterproof membrane, and improving the bonding performance of the waterproof membrane to the metal base surface.

[0009] To achieve the above purpose, the technical solutions adopted are as follows: A butyl self-adhesive waterproofing membrane specially used for metal roof maintenance is composed of the following five layers from top to bottom: a durable waterproof layer, a flexible waterproof layer, a metal reinforcement layer, a bonding layer and an isolation layer; the durable waterproof layer is an exposed layer.

[0010] The durable waterproof layer is composed of the following raw material components by weight: 40-50 parts of polyolefin particles, 0.3-0.8 parts of antioxidants, 3-5 parts of titanium dioxide, 10-20 parts of ultrafine glass microbead powder, 10-20 parts of magnesium hydroxide, 1-5 parts of antimony trioxide, and 0.5-1.5 parts of light stabilizers. The antioxidant is a hindered phenol antioxidant, preferably one or a combination of antioxidant 1010 and antioxidant 168, and more preferably a combination of antioxidant 1010 and antioxidant 168; the light stabilizer is a hindered amine light stabilizer, preferably one or a combination of light stabilizer 2020 and light stabilizer 944.

[0011] The flexible waterproof layer is composed of the following raw material components by weight: 20-30 parts of polyolefin particles, 10-20 parts of SEBS (saturated SBS), 20-30 parts of ultrafine glass microbead powder, 10-20 parts of magnesium hydroxide, 10-20 parts of EPDM (ethylene propylene diene monomer rubber), 0.3-0.8 parts of antioxidant, 0.5-1.5 parts of carbon black, and 0.01-0.05 parts of zinc oxide. The ultrafine glass microbead powder and antioxidant used in the flexible waterproof layer are the same as those used in the durable waterproof layer.

[0012] The metal reinforcement layer is an aluminum metal mesh, which is woven by wire drawing of an aluminum-magnesium alloy with an ultimate tensile strength of ≥95MPa, a bending strength of ≤100MPa, and a Poisson's ratio of 0.33; the mesh size is 8mm×8mm, and the unit area mass is 1000g / square meter.

[0013] The adhesive layer is a specially modified low-diffusion butyl self-adhesive, which is composed of the following raw material components by weight: 5-15 parts of ordinary butyl rubber, 10-20 parts of brominated butyl rubber, 5-10 parts of terpene resin, 20-35 parts of C5 tackifying resin, 20-35 parts of low molecular weight polyisobutylene, 5-8 parts of medium molecular weight polyisobutylene, 3-8 parts of vulcanized resin, 10-15 parts of carbon black, 10-15 parts of shell powder, and 3-5 parts of coupling agent. The coupling agent is any one of γ-(2,3-epoxypropoxy)propyltrimethoxysilane KH560 and γ-aminopropyltriethoxysilane KH550, or a combination of two of them.

[0014] The ultrafine glass microbead powder used in the present invention has a particle size of 2.5-5 μm and is composed of glass microbeads, fly ash and stearic acid, wherein the mass ratio of glass microbeads to fly ash is 60-80:40-20, and the mass of stearic acid is 0.5%-1% of the total mass of glass microbeads and fly ash.

[0015] The polyolefin particles have an ethylene content of 15-21%, a propylene content of 78-85%, a molecular weight of 25W-35W, and a melting temperature of 140° C.-165° C.; the percentages are by mass.

[0016] The SEBS has a styrene content of 28%-33% and a molecular weight of 180,000-250,000; The EPDM: Mooney viscosity is between 48 and 52; The ordinary butyl rubber is an ordinary butyl rubber with a star-branched structure and a Mooney viscosity of 45-52; The brominated butyl rubber is a brominated butyl rubber with a benzyl bromide group and a Mooney viscosity of 38-42; The terpene resin is a terpene phenolic resin having a softening point of 120-135°C; The low molecular weight polyisobutylene has a molecular weight between 800 and 1500; The medium molecular weight polyisobutylene has a molecular weight between 10,000 and 25,000.

[0017] A preparation process of a butyl self-adhesive waterproofing membrane specially used for metal roof maintenance, the steps are as follows: Step 1: Prepare a durable waterproof layer The raw materials of the durable waterproof layer are added to the first twin-screw extruder according to the formula ratio, and the screw speed is 400-800 rpm; the melt pressure is accurately controlled by using a melt-pressure closed loop to control the extruder speed, and the extruder melt pressure is set to 1.2-1.5MPa, and the melt pressure after the melt pump is 4-8MPa.

[0018] Step 2: Prepare a flexible waterproof layer Add the raw materials of the flexible waterproof layer to the second twin-screw extruder according to the formula ratio, the screw speed is 400-800 rpm, the melt pressure is accurately controlled by the melt pressure closed loop control extruder speed, the extruder melt pressure is set to 1.5-2MPa, and the melt pressure after the melt pump is 6-8MPa. The hardness of the obtained flexible waterproof layer is between Shore A70-85.

[0019] Step 3: Composite The second twin-screw extruder and the first twin-screw extruder feed the same extrusion die head, and the flexible waterproof layer and the durable waterproof layer are compounded in the die to obtain a composite waterproof layer. The thickness ratio of the flexible waterproof layer to the durable waterproof layer is 1-4:1-3.

[0020] Step 4: Calendering and cooling The composite waterproof layer prepared in step 3 is introduced into a three-roller cooling calendering device, and the composite waterproof layer is calendered into shape and cooled to room temperature.

[0021] Step 5: Place the metal reinforcement layer The aluminum metal mesh is introduced into the aluminum mesh unwinding device. The tension of the aluminum mesh is controlled by the magnetic powder controller to ensure that the aluminum mesh enters the composite roller with a constant tension, and the tension is controlled at 20-25N. The aluminum mesh heating device is turned on to heat the aluminum mesh at a temperature of 100-130°C. The aluminum metal mesh is embedded in the flexible waterproof layer, and the aluminum metal mesh is wrapped by the flexible waterproof layer without being exposed.

[0022] Step 6: Glue The raw materials of the bonding layer are placed in the melt pump of the glue coating device according to the proportion, and after being fully melted by mixing at 160-180°C, they are coated on one side of the flexible waterproof layer. The coating amount is 340-360g / square meter.

[0023] Step 7: Obtain the finished product After gluing, a PE film with an isolation material is covered on the glue-coated side and rolled up to obtain a finished product.

[0024] The beneficial effects of the present invention are as follows: (1) The dimensional change rate of the present invention is small, and the dimensional change rate (90°C) is 0.11-0.15%, which greatly reduces the deformation of the coiled material caused by temperature. The coiled material of the present invention will not wrinkle due to the change of temperature. It solves the problem that when the waterproof coiled material of the prior art is used for the metal base in an exposed environment, the coiled material wrinkles due to thermal expansion and contraction and separates from the metal base; (2) The waterproof membrane has good aging resistance, and the artificial climate accelerated aging time with a maximum tensile strength retention rate of 80% is greater than 6000h; (3) The roll material of the present invention cooperates with a specific waterproof layer and an adhesive layer, and can achieve full adhesion laying on the special-shaped structural roof under the condition of using a metal mesh reinforcement, solving the problem that the roll material cannot be fully adhered to the special-shaped base surface due to deformation stress, or even detaches. The peel strength (roll material to roll material) is 3.1-3.5N / m, and the peel strength (roll material to aluminum plate) is 3.5-3.8N / m. DETAILED DESCRIPTION

[0025] To make the purpose, technical solution and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0026] Example 1 A butyl self-adhesive waterproofing membrane for metal roof maintenance A butyl self-adhesive waterproofing membrane specially used for metal roof maintenance is composed of the following five layers from top to bottom: a durable waterproof layer, a flexible waterproof layer, a metal reinforcement layer, a bonding layer and an isolation layer; the durable waterproof layer is an exposed layer.

[0027] The durable waterproof layer is composed of the following components, calculated by weight: 40 parts of polyolefin particles, 0.3 parts of antioxidant, 3 parts of titanium dioxide, 10 parts of ultrafine glass microbead powder, 10 parts of magnesium hydroxide, 1 part of antimony trioxide, and 0.5 parts of light stabilizer; The flexible waterproof layer comprises: 20 parts of polyolefin particles, 10 parts of SEBS, 30 parts of ultrafine glass microbead powder, 10 parts of magnesium hydroxide, 20 parts of EPDM, 0.3 parts of antioxidant, 0.5 parts of carbon black and 0.01 parts of zinc oxide; the antioxidant and ultrafine glass microbead powder used in the flexible waterproof layer are the same as those used in the durable waterproof layer.

[0028] The metal reinforcement layer is an aluminum metal mesh, which is woven by wire drawing of an aluminum-magnesium alloy with an ultimate tensile strength of ≥95MPa, a bending strength of ≤100MPa, and a Poisson's ratio of 0.33; the mesh size is 8mm×8mm, and the unit area mass is 1000g / square meter.

[0029] The bonding layer is a specially modified low-diffusion butyl self-adhesive, which is composed of the following components by weight: 10 parts of ordinary butyl rubber, 15 parts of brominated butyl rubber, 10 parts of terpene resin, 20 parts of C5 tackifying resin, 25 parts of low molecular weight polyisobutylene, 6 parts of medium molecular weight polyisobutylene, 5 parts of vulcanized resin, 12 parts of carbon black, 10 parts of shell powder, and 4 parts of coupling agent.

[0030] The polyolefin particles have an ethylene content of 15% and a propylene content of 85%; The antioxidant is a hindered phenol antioxidant, which is prepared by mixing antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1; The light stabilizer is a hindered amine light stabilizer. In this embodiment, light stabilizer 2020 is used. The ultrafine glass microbead powder has a particle size of 2.5-5 μm and is composed of glass microbeads, fly ash and stearic acid, wherein the mass ratio of glass microbeads to fly ash is 80:20, and the mass of stearic acid is 1% of the total mass of glass microbeads and fly ash; The coupling agent is γ-(2,3-epoxypropoxy)propyltrimethoxysilane KH560.

[0031] A preparation process of a butyl self-adhesive waterproofing membrane specially used for metal roof maintenance, the steps are as follows: Step 1: Prepare a durable waterproof layer The raw materials of the durable waterproof layer are added to the first twin-screw extruder according to the formula ratio. The screw parameters are: the screw aspect ratio is greater than 42:1, the maximum screw torque is greater than 1500NM; the screw speed is 800 rpm, and the melt pressure is accurately controlled by using a melt-pressure closed loop to control the extruder speed. The extruder melt is set to 1.5MPa and the melt pressure after the melt pump is 8MPa.

[0032] Step 2: Prepare a flexible waterproof layer The raw materials of the flexible waterproof layer are added to the second twin-screw extruder according to the formula ratio. The screw parameters are: the screw aspect ratio is greater than 42:1, the maximum screw torque is greater than 1500NM; the screw speed is 800 rpm, and the melt pressure is accurately controlled by using a melt pressure closed loop to control the extruder speed. The extruder melt pressure is set to 2MPa, and the melt pressure after the melt pump is 8MPa. The hardness of the obtained flexible waterproof layer is Shore A70.

[0033] Step 3: Composite The second twin-screw extruder and the first twin-screw extruder feed the same extrusion die head, and the flexible waterproof layer and the durable waterproof layer are compounded in the mold to obtain a composite waterproof layer with a thickness of 1.2 mm.

[0034] The thickness ratio of the flexible waterproof layer to the durable waterproof layer is 1:1.

[0035] Step 4: Calendering and cooling The composite waterproof layer prepared in step 3 is introduced into a three-roller cooling calendering device, and the composite waterproof layer is calendered into shape and cooled to room temperature.

[0036] Step 5: Place the metal reinforcement layer The aluminum metal mesh is introduced into the aluminum mesh unwinding device. The tension of the aluminum mesh is controlled by a magnetic powder controller to ensure that the aluminum mesh enters the composite roller with a constant tension. The tension is controlled at 20N.

[0037] Turn on the aluminum mesh heating device to heat the aluminum mesh at a heating temperature of 100°C.

[0038] The aluminum metal mesh is embedded in the flexible waterproof layer, and the aluminum metal mesh is wrapped by the flexible waterproof layer and is not exposed.

[0039] Step 6: Glue The raw materials of the bonding layer were mixed at 170° C. according to the ratio to obtain the adhesive used in the adhesive layer. The adhesive was melt-extruded by a glue coating machine and then coated on one side of the flexible waterproof layer, with a coating amount of 350 g / m2.

[0040] Step 7: Obtain the finished product After gluing, a PE film with an isolation material is covered on the glue-coated side and rolled up to obtain a finished product.

[0041] Example 2 A butyl self-adhesive waterproofing membrane for metal roof maintenance A butyl self-adhesive waterproofing membrane specially used for metal roof maintenance is composed of the following five layers from top to bottom: a durable waterproof layer, a flexible waterproof layer, a metal reinforcement layer, a bonding layer and an isolation layer; the durable waterproof layer is an exposed layer.

[0042] The durable waterproof layer is composed of the following components by weight: 50 parts of polyolefin particles, 0.5 parts of antioxidant, 4 parts of titanium dioxide, 15 parts of ultrafine glass microbead powder, 20 parts of magnesium hydroxide, 4 parts of antimony trioxide, and 1.5 parts of light stabilizer; The flexible waterproof layer comprises: 30 parts of polyolefin particles, 20 parts of SEBS, 20 parts of ultrafine glass microbead powder, 16 parts of magnesium hydroxide, 12 parts of EPDM, 0.5 parts of antioxidant, 1.5 parts of carbon black and 0.04 parts of zinc oxide; the antioxidant and ultrafine glass microbead powder used in the flexible waterproof layer are the same as those used in the durable waterproof layer.

[0043] The metal reinforcement layer is an aluminum metal mesh, which is woven by wire drawing of an aluminum-magnesium alloy with an ultimate tensile strength of ≥95MPa, a bending strength of ≤100MPa, and a Poisson's ratio of 0.33; the mesh size is 8mm×8mm, and the unit area mass is 1000g / square meter.

[0044] The bonding layer is a specially modified low-diffusion butyl self-adhesive, and is composed of the following components by weight: 5 parts of ordinary butyl rubber, 10 parts of brominated butyl rubber, 5 parts of terpene resin, 35 parts of C5 tackifying resin, 35 parts of low molecular weight polyisobutylene, 8 parts of medium molecular weight polyisobutylene, 3 parts of vulcanized resin, 10 parts of carbon black, 15 parts of shell powder, and 5 parts of coupling agent.

[0045] The polyolefin particles have an ethylene content of 21% and a propylene content of 79%; The antioxidant is a hindered phenol antioxidant, which is prepared by mixing antioxidant 1010 and antioxidant 168 in a mass ratio of 3:2; The light stabilizer is a hindered amine light stabilizer. In this embodiment, light stabilizer 2020 is used. The ultrafine glass microbead powder has a particle size of 2.5-5 μm and is composed of glass microbeads, fly ash and stearic acid, wherein the mass ratio of glass microbeads to fly ash is 80:20, and the mass of stearic acid is 1% of the total mass of glass microbeads and fly ash; The coupling agent is γ-(2,3-epoxypropoxy)propyltrimethoxysilane KH550.

[0046] A preparation process of a butyl self-adhesive waterproofing membrane specially used for metal roof maintenance, the steps are as follows: Step 1: Prepare a durable waterproof layer The raw materials of the durable waterproof layer are added to the first twin-screw extruder according to the formula ratio. The screw parameters are: the screw aspect ratio is greater than 42:1, the maximum screw torque is greater than 1500NM; the screw speed is 600 rpm, and the melt pressure is accurately controlled by using a melt-pressure closed-loop control of the extruder speed. The extruder melt pressure is set to 1.5MPa, and the melt pressure after the melt pump is 6MPa.

[0047] Step 2: Prepare a flexible waterproof layer The raw materials of the flexible waterproof layer are added to the second twin-screw extruder according to the formula ratio. The screw parameters are: the screw aspect ratio is greater than 42:1, the maximum screw torque is greater than 1500NM; the screw speed is 600 rpm, and the melt pressure is accurately controlled by using a melt pressure closed loop to control the extruder speed. The extruder melt pressure is set to 2MPa, and the melt pressure after the melt pump is 8MPa. The hardness of the obtained flexible waterproof layer is Shore A78.

[0048] Step 3: Composite The second twin-screw extruder and the first twin-screw extruder feed the same extrusion die head, and the flexible waterproof layer and the durable waterproof layer are compounded in the mold to obtain a composite waterproof layer with a thickness of 1.2 mm. The thickness ratio of the flexible waterproof layer to the durable waterproof layer is 4:3.

[0049] Step 4: Calendering and cooling The composite waterproof layer prepared in step 3 is introduced into a three-roller cooling calendering device, and the composite waterproof layer is calendered into shape and cooled to room temperature.

[0050] Step 5: Place the metal reinforcement layer The aluminum metal mesh is introduced into the aluminum mesh unwinding device. The tension of the aluminum mesh is controlled by a magnetic powder controller to ensure that the aluminum mesh enters the composite roller with a constant tension. The tension is controlled at 25N.

[0051] The aluminum mesh heating device was turned on to heat the aluminum mesh at a heating temperature of 130°C.

[0052] The aluminum metal mesh is embedded in the flexible waterproof layer, and the aluminum metal mesh is wrapped by the flexible waterproof layer and is not exposed.

[0053] Step 6: Glue The raw materials of the bonding layer were mixed at 170° C. according to the ratio to obtain the adhesive used in the adhesive layer. The adhesive was melt-extruded by a glue coating machine and then coated on one side of the flexible waterproof layer, with a coating amount of 350 g / m2.

[0054] Step 7: Obtain the finished product After gluing, a PE film with an isolation material is covered on the glue-coated side and rolled up to obtain a finished product.

[0055] Example 3 A butyl self-adhesive waterproofing membrane for metal roof maintenance A butyl self-adhesive waterproofing membrane specially used for metal roof maintenance is composed of the following five layers from top to bottom: a durable waterproof layer, a flexible waterproof layer, a metal reinforcement layer, a bonding layer and an isolation layer; the durable waterproof layer is an exposed layer.

[0056] The durable waterproof layer is composed of the following components, calculated by weight: 45 parts of polyolefin particles, 0.7 parts of antioxidant, 5 parts of titanium dioxide, 20 parts of ultrafine glass microbead powder, 15 parts of magnesium hydroxide, 5 parts of antimony trioxide, and 1.2 parts of light stabilizer; The flexible waterproof layer comprises: 25 parts of polyolefin particles, 15 parts of SEBS, 25 parts of ultrafine glass microbead powder, 20 parts of magnesium hydroxide, 18 parts of EPDM, 0.8 parts of antioxidant, 1 part of carbon black and 0.05 parts of zinc oxide; the antioxidant and ultrafine glass microbead powder used in the flexible waterproof layer are the same as those used in the durable waterproof layer.

[0057] The metal reinforcement layer is an aluminum metal mesh, which is woven by wire drawing of an aluminum-magnesium alloy with an ultimate tensile strength of ≥95MPa, a bending strength of ≤100MPa, and a Poisson's ratio of 0.33; the mesh size is 8mm×8mm, and the unit area mass is 1000g / square meter.

[0058] The bonding layer is a specially modified low-diffusion butyl self-adhesive, which is composed of the following components by weight: 7 parts of ordinary butyl rubber, 20 parts of brominated butyl rubber, 7 parts of terpene resin, 28 parts of C5 tackifying resin, 28 parts of low molecular weight polyisobutylene, 6 parts of medium molecular weight polyisobutylene, 5 parts of vulcanized resin, 12 parts of carbon black, 12 parts of shell powder, and 4 parts of coupling agent.

[0059] The polyolefin particles have an ethylene content of 20% and a propylene content of 80%; The antioxidant is a hindered phenol antioxidant, which is prepared by mixing antioxidant 1010 and antioxidant 168 in a mass ratio of 1:2; The light stabilizer is a hindered amine light stabilizer. In this embodiment, light stabilizers 944 and 2020 are used in a mass ratio of 1:2. The ultrafine glass microbead powder has a particle size of 2.5-5 μm and is composed of glass microbeads, fly ash and stearic acid, wherein the mass ratio of glass microbeads to fly ash is 80:20, and the mass of stearic acid is 1% of the total mass of glass microbeads and fly ash; The coupling agent is γ-(2,3-epoxypropoxy)propyltrimethoxysilane KH550.

[0060] A preparation process of a butyl self-adhesive waterproofing membrane specially used for metal roof maintenance, the steps are as follows: Step 1: Prepare a durable waterproof layer The raw materials of the durable waterproof layer are added to the first twin-screw extruder according to the formula ratio. The screw parameters are: the screw aspect ratio is greater than 42:1, the maximum screw torque is greater than 1500NM; the screw speed is 500 rpm, and the melt pressure is accurately controlled by using a melt-pressure closed-loop control of the extruder speed. The extruder melt pressure is set to 1.2MPa, and the melt pressure after the melt pump is 4MPa.

[0061] Step 2: Prepare a flexible waterproof layer The raw materials of the flexible waterproof layer are added to the second twin-screw extruder according to the formula ratio. The screw parameters are: the screw aspect ratio is greater than 42:1, the maximum screw torque is greater than 1500NM; the screw speed is 500 rpm, and the melt pressure is accurately controlled by using a melt pressure closed loop to control the extruder speed. The extruder melt pressure is set to 1.5MPa and the melt pressure after the melt pump is 6MPa. The hardness of the obtained flexible waterproof layer is Shore A82.

[0062] Step 3: Composite The second twin-screw extruder and the first twin-screw extruder feed the same extrusion die head, and the flexible waterproof layer and the durable waterproof layer are compounded in the mold to obtain a composite waterproof layer with a thickness of 1.2 mm. The thickness ratio of the flexible waterproof layer to the durable waterproof layer is 3:2.

[0063] Step 4: Calendering and cooling The composite waterproof layer prepared in step 3 is introduced into a three-roller cooling calendering device, and the composite waterproof layer is calendered into shape and cooled to room temperature.

[0064] Step 5: Place the metal reinforcement layer The aluminum metal mesh is introduced into the aluminum mesh unwinding device. The tension of the aluminum mesh is controlled by a magnetic powder controller to ensure that the aluminum mesh enters the composite roller with a constant tension. The tension is controlled at 20N.

[0065] The aluminum mesh heating device was turned on to heat the aluminum mesh at a heating temperature of 130°C.

[0066] The aluminum metal mesh is embedded in the flexible waterproof layer, and the aluminum metal mesh is wrapped by the flexible waterproof layer and is not exposed.

[0067] Step 6: Glue The raw materials of the bonding layer are mixed at 170°C according to the ratio to obtain the adhesive used in the adhesive layer. The adhesive is then melt-extruded through a glue coating machine and coated on one side of the flexible waterproof layer. The amount of glue coated is 350g / square meter. Step 7: Obtain the finished product After gluing, a PE film with an isolation material is covered on the glue-coated side and rolled up to obtain a finished product.

[0068] Example 4 Performance Testing The waterproof membranes prepared in Examples 1-3 were tested for performance indicators, and the performance indicator test results are shown in Table 1; Table 1 Test results of performance indexes of waterproof membranes prepared in Examples 1-3

[0069] As can be seen from Table 1, the maximum tensile force of the waterproof roll prepared by the present invention is 1350-1500N / 50mm, the elongation at break is 1000-1100%, the flame retardant performance is B1 grade, the artificial climate accelerated aging time with a maximum tensile force retention rate of 80% is greater than 6000h, the dimensional change rate (90°C) is 0.11-0.15%, the peel strength (roll to roll) is 3.1-3.5N / m, and the peel strength (roll to aluminum plate) is 3.5-3.8N / m.

[0070] The raw materials used in Examples 1-3 are: The ultrafine glass microbead powder used has a particle size of 2.5-5μm and is composed of glass microbeads, fly ash and stearic acid. The mass ratio of glass microbeads to fly ash is 60-80:40-20, and the mass of stearic acid is 0.5%-1% of the total mass of glass microbeads and fly ash. The SEBS used: styrene content is 28%-33%, molecular weight is between 180000-250000; EPDM used: Mooney viscosity is between 48-52; The common butyl rubber used is a star-branched structure common butyl rubber with a Mooney viscosity of 45-52; The brominated butyl rubber used is a brominated butyl rubber with a benzyl bromide group and a Mooney viscosity of 38-42; The terpene resin used is a terpene phenolic resin with a softening point of 120-135°C; The low molecular weight polyisobutylene used: molecular weight is between 800-1500; The medium molecular weight polyisobutylene used has a molecular weight between 10,000 and 25,000.

[0071] Unless otherwise specified, the ratios described in the present invention are all mass ratios, and the percentages described are all mass percentages.

[0072] Obviously, under the concept of the present invention, there are many specific implementation methods that can be changed. Here, it should be stated that any changes made under the inventive concept of the present invention will fall within the protection scope of the present invention.

Claims

1. A butyl self-adhesive waterproofing membrane specially used for metal roof maintenance, characterized by: From top to bottom, it is composed of the following five layers: a durable waterproof layer, a flexible waterproof layer, a metal reinforcement layer, a bonding layer and an isolation layer; the durable waterproof layer includes the following raw material components: polyolefin particles, antioxidants, titanium dioxide, ultrafine glass microbead powder, magnesium hydroxide, antimony trioxide, and light stabilizers; the flexible waterproof layer includes the following raw material components: polyolefin particles, SEBS, ultrafine glass microbead powder, magnesium hydroxide, EPDM, antioxidants, carbon black, and zinc oxide.

2. The butyl self-adhesive waterproofing membrane for metal roof maintenance according to claim 1 is characterized by: The metal reinforcement layer is an aluminum metal mesh.

3. The butyl self-adhesive waterproof membrane for metal roof maintenance according to claim 1 is characterized by: The bonding layer comprises the following raw material components: ordinary butyl rubber, brominated butyl rubber, terpene resin, C5 tackifying resin, low molecular weight polyisobutylene, medium molecular weight polyisobutylene, vulcanized resin, carbon black, shell powder and coupling agent.

4. The butyl self-adhesive waterproofing membrane for metal roof maintenance according to claim 1 is characterized by: The antioxidant is one of antioxidant 1010 and antioxidant 168 or a combination of two thereof; the light stabilizer is one of light stabilizer 2020 and light stabilizer 944 or a combination of two thereof; the ultrafine glass microbead powder has a particle size of 2.5-5 μm.

5. The butyl self-adhesive waterproofing membrane for metal roof maintenance according to claim 3 is characterized by: The coupling agent is any one of γ-(2,3-epoxypropoxy)propyltrimethoxysilane KH560 and γ-aminopropyltriethoxysilane KH550 or a combination of the two.

6. The butyl self-adhesive waterproofing membrane for metal roof maintenance according to claim 1 is characterized by: The durable waterproof layer is composed of the following raw material components, calculated by weight: 40-50 parts of polyolefin particles, 0.3-0.8 parts of antioxidant, 3-5 parts of titanium dioxide, 10-20 parts of ultrafine glass microbead powder, 10-20 parts of magnesium hydroxide, 1-5 parts of antimony trioxide, and 0.5-1.5 parts of light stabilizer.

7. The butyl self-adhesive waterproofing membrane for metal roof maintenance according to claim 1 is characterized by: The flexible waterproof layer is composed of the following raw material components, calculated by weight: 20-30 parts of polyolefin particles, 10-20 parts of SEBS, 20-30 parts of ultrafine glass microbead powder, 10-20 parts of magnesium hydroxide, 10-20 parts of EPDM, 0.3-0.8 parts of antioxidant, 0.5-1.5 parts of carbon black, and 0.01-0.05 parts of zinc oxide.

8. The butyl self-adhesive waterproofing membrane for metal roof maintenance according to claim 1 is characterized by: The bonding layer is composed of the following raw material components, calculated by weight: 5-15 parts of ordinary butyl rubber, 10-20 parts of brominated butyl rubber, 5-10 parts of terpene resin, 20-35 parts of C5 tackifying resin, 20-35 parts of low molecular weight polyisobutylene, 5-8 parts of medium molecular weight polyisobutylene, 3-8 parts of vulcanized resin, 10-15 parts of carbon black, 10-15 parts of shell powder, and 3-5 parts of coupling agent.

9. A preparation process of a butyl self-adhesive waterproofing membrane for metal roof maintenance, characterized in that: The method comprises the steps of preparing a durable waterproof layer, preparing a flexible waterproof layer, compounding, calendering and cooling, placing a metal reinforcement layer, coating with glue and preparing a finished product; the method of preparing the durable waterproof layer comprises: adding various raw materials of the durable waterproof layer into a first twin-screw extruder according to a formula ratio, and adopting a melt-pressure closed loop to control the speed of the extruder to accurately control the melt pressure; the method of preparing the flexible waterproof layer comprises: adding various raw materials of the flexible waterproof layer into a second twin-screw extruder according to a formula ratio, and adopting a melt-pressure closed loop to control the speed of the extruder to accurately control the melt pressure; the hardness of the flexible waterproof layer is between Shore A70 and 85.

10. The preparation process of a butyl self-adhesive waterproofing membrane for metal roof maintenance according to claim 9, characterized in that: The compounding: the second twin-screw extruder and the first twin-screw extruder feed materials to the same extrusion die head, and the flexible waterproof layer and the durable waterproof layer are compounded in the mold to obtain a composite waterproof layer; the thickness ratio of the flexible waterproof layer to the durable waterproof layer is 1-4:1-3; The calendering and cooling: the composite waterproof layer is introduced into a three-roller cooling calendering device, the composite waterproof layer is calendered into shape and cooled to room temperature; Placing the metal reinforcement layer: introducing the aluminum metal mesh into the aluminum mesh unwinding device, the tension of the aluminum mesh is controlled by a magnetic powder controller to ensure that the aluminum mesh enters the composite roller with a constant tension, and the tension is controlled at 20-25N; turning on the aluminum mesh heating device to heat the aluminum mesh at a heating temperature of 100-130°C; embedding the aluminum metal mesh into the flexible waterproof layer, and the aluminum metal mesh is wrapped by the flexible waterproof layer; The gluing process is as follows: the raw materials of the bonding layer are placed in a melt pump of a gluing device according to a proportion, mixed at 160-180° C. to fully melt the raw materials, and then applied to one side of the flexible waterproof layer.

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