Unidirectional elastic waterproof roll and preparation method thereof

Abstract

The preparation method comprises the following steps: pouring thermoplastic elastomer particles into a high-speed mixer, starting a stirring device to primarily disperse the thermoplastic elastomer particles uniformly, sequentially adding a filling material, a functional material, an antioxidant, an ultraviolet light absorber, a lubricant and a dispersing agent according to a ratio, continuously stirring, and uniformly mixing to obtain the unidirectional elastic waterproof coiled material. The solid raw materials are fully mixed; the preparation method comprises the following steps: slowly adding oil into a high-speed mixer in a stirring process, continuously stirring to enable the oil to fully permeate into an elastomer until the material is in a uniform and consistent state, conveying the uniformly mixed raw materials into a hopper of a double-screw extruder, carrying out melt extrusion, compounding the extruded material and a uniaxial stretching non-woven fabric through a double-roller calender, and carrying out extrusion molding. The coiled material prepared by the preparation method disclosed by the invention has a unidirectional elastic stretching effect, the mechanical property of the treated waterproof cloth can meet the use in building waterproofing, and the mechanical property can still be maintained after thermo-oxidative aging treatment.

Description

Technical Field

[0001] The invention relates to the technical field of building waterproof materials, and in particular to a unidirectional elastic waterproof coiled material and a preparation method thereof. Background Art

[0002] The waterproof membranes currently on the market have problems such as low tensile strength and poor low-temperature flexibility, resulting in a short service life. At this stage, the production technology and product quality of domestic waterproof membranes are relatively backward. The aging resistance, weather resistance, crack resistance and weldability of ordinary waterproof membranes are still somewhat behind those of foreign countries, which seriously affects the promotion and use of products. Through in-depth research on the performance degradation law of waterproof membranes under harsh environmental conditions, the present invention finds that the main reason is that the various functional additives added to the matrix resin cannot play a good role and are not efficient; in addition, the intrinsic performance of the matrix resin is not satisfactory, and it cannot take into account the various requirements of use and construction. Therefore, the technical research and development of high-performance polyolefin unidirectional elastomer waterproof membranes under harsh environmental testing conditions is carried out.

[0003] The present invention aims to provide a unidirectional elastic waterproof roll material with high tensile strength, long aging period, long service life and low cost and a preparation method thereof. It combines unidirectional stretch non-woven fabric and polyolefin thermoplastic elastomer to effectively solve engineering leakage problems in various use environments. Summary of the invention

[0004] In view of the problems existing in the prior art, the purpose of the present invention is to provide a unidirectional elastic waterproof membrane and a preparation method thereof. The membrane prepared by the present invention has unique unidirectional elastic properties. While ensuring excellent waterproof performance, it can adapt to structural expansion and deformation in a specific direction, effectively preventing membrane rupture or leakage caused by changes in the base layer, and greatly improving the reliability and durability of the waterproof system.

[0005] To achieve the above object, the technical solution of the present invention is as follows: A unidirectional elastic waterproof coiled material, characterized in that it comprises an elastic main layer, one side of the elastic main layer is provided with a base layer one, and the other side of the elastic main layer is provided with a base layer two, the elastic main layer material is a thermoplastic elastomer; the base layer one and base layer two materials are unidirectionally stretched polyester, nylon or polypropylene spunlace non-woven fabrics.

[0006] Furthermore, the raw material components of the elastic main body layer and the mass percentage of each component in the total raw material are as follows: Thermoplastic elastomer 30-50%; polyolefin resin 15-20%; oil 15-20%; filling material 5-25%; functional material 0.1-3%; antioxidant 0.2-0.4%; ultraviolet absorber 0.1%- 0.3%; lubricant 1- 2%.

[0007] Furthermore, the thermoplastic elastomer is a linear triblock copolymer (SEBS); the polyolefin resin is one of polypropylene (PP) or polyethylene (PE); the filling material is one or more of calcium carbonate powder, talcum powder, titanium dioxide, and nanoclay; the oil is paraffin-based white oil; the functional material is a nanosheet layered material; the antioxidant is one or two of hindered phenols and phosphites; the UV absorber is a benzophenone UV absorber; and the lubricant is one or two of calcium stearate and zinc stearate.

[0008] Furthermore, the linear triblock copolymer (SEBS) is a styrene-ethylene-butylene-styrene block copolymer; the functional material is graphene, nanographene or oxidized nanographene; the hindered phenol is 1010 or 330; the phosphite is 168; and the benzophenone ultraviolet absorber is UV-531.

[0009] The present invention also proposes a method for preparing a unidirectional elastic waterproof coiled material, comprising the following steps: 1) Pour the thermoplastic elastomer particles into a high-speed mixer, turn on the stirring device to make the thermoplastic elastomer particles preliminarily dispersed evenly, and then add filler materials, functional materials, antioxidants, ultraviolet absorbers, and lubricants in proportion, and continue stirring until all solid raw materials are fully mixed; 2) Slowly add the oil into the high-speed mixer in step 1), while reducing the stirring speed and continuing stirring to allow the oil to fully penetrate into the elastomer until the material is uniform and consistent without obvious particles or lumps; 3) The raw materials uniformly mixed in step 2) are conveyed to the hopper of a twin-screw extruder through a screw conveyor, and melted and extruded through the screw extruder; 4) Compounding the material extruded in step 3) with the unidirectionally stretched nonwoven fabric through a double-roll calender to obtain a unidirectional elastic waterproof roll; 5) The unidirectional elastic waterproof membrane obtained in step 4) is introduced into a winding machine through a traction device for winding after cooling and shaping; 6) Wrap the unidirectional elastic waterproofing membrane after step 5) with plastic film, mark the name, specification, model, production date and manufacturer of the membrane on the package, and finally store the packaged membrane in a dry, ventilated and cool warehouse.

[0010] Furthermore, in step 1), the speed of the stirring device is 500-800 rpm, the stirring time is 3-5 minutes, and the stirring time is continued for 5-8 minutes.

[0011] Furthermore, in step 2), the oil is slowly added to the high-speed mixer being stirred in step 1), the stirring speed is reduced to 300-500 rpm, and stirring is continued for 10-15 minutes; during the mixing process, the jacket temperature of the high-speed mixer is increased to 60-80°C.

[0012] Furthermore, in step 3), the screw diameter of the twin-screw extruder is 30-50 mm, and the aspect ratio is 25-35; the temperature of each section of the extruder is set to 150-160°C, 150-160°C, 160-170°C, 160-170°C from the hopper end to the head end, and the screw speed is 20-30 rpm.

[0013] Furthermore, in step 4), a T-shaped flat die is selected as the extrusion molding die, and the width of the die is determined according to the design width of the coil, generally 0.3-1.2 meters; the gap of the die should be adjusted according to the thickness requirement of the coil, usually controlled between 1-3 mm; by adjusting the opening of the die and the extrusion amount of the extruder, the thickness and width of the coil can be accurately controlled; the roller pressure is 5-10Mpa.

[0014] Furthermore, in step 5), the winding machine adopts a central winding method, the core diameter is 75-100 mm; the winding tension is 50-100 N / m; the winding speed is 3-6 m / min; In step 6), the number of packaging layers is 2-3 layers, and the stacking height is less than 5 layers.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1) The unidirectional waterproofing roll prepared by the method of the present invention has a unidirectional elastic stretching effect, and the mechanical properties of the waterproofing roll after treatment can meet the requirements for use in building waterproofing, and can still be maintained after thermal oxidation aging treatment, and the waterproofing cloth can meet the requirements for impermeability; 2) The roll prepared by the method of the present invention can easily cope with various adverse climatic conditions and complex waterproofing scenarios due to its multi-layer structure and high-quality material combination. It can build an indestructible waterproof line for buildings in a humid and waterlogged environment for a long time, effectively prevent leakage, and provide solid protection for the safety of building structures and the integrity of internal facilities. 3) Compared with traditional waterproofing membranes, the one-way waterproofing membrane prepared by the present invention can better follow the slight displacement of the base layer and undergo corresponding deformation, and will not damage the performance of the membrane itself due to excessive stretching or extrusion. Thus, while ensuring the waterproofing effect, the stability and adaptability of the entire waterproofing system are significantly enhanced, and the risk of leakage caused by structural changes is effectively reduced; 4) The present invention has excellent durability through the rational use of various additives such as antioxidants and strict screening of the weather resistance of raw materials. In the field of building waterproofing, it can consistently maintain excellent waterproof performance and physical and mechanical properties, provide long-lasting and reliable waterproof protection for buildings, and greatly reduce maintenance and replacement costs; 5) The standardized specification design and convenient construction characteristics of the roll material of the present invention, such as the self-adhesive layer, make it easy to operate and efficient during on-site construction; construction personnel can quickly and accurately lay the roll material at the predetermined position without complicated professional tools and cumbersome construction processes, and ensure that it fits tightly with the base layer without bubbles and wrinkles, which greatly shortens the construction period, reduces the construction difficulty and labor costs, and effectively improves the consistency of construction quality and waterproof effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a cross-sectional view of the waterproof membrane of the present invention; Figure 2 This is a diagram of the horizontal and vertical test strips prepared for the waterproof membrane sample of Example 1 before the tensile test; Figure 3 Rebound diagram of horizontal and vertical test strips after tensile testing of waterproof membrane samples prepared in Example 1; Figure 4 The test specimen prepared from the waterproof membrane sample of Example 1 is subjected to thermal oxidation aging treatment at 115°C for 7 days; Figure 5 This is a diagram showing the water-impermeability effect of the waterproof membrane sample of Example 1; Figure 6 The domestic polypropylene waterproof cloth of Comparative Example 1 was heat treated at 115°C for 7 days; Figure 7 It is a schematic diagram of the use of the unidirectional elastic waterproof membrane of the present invention.

[0017] In the figure: 1. Base layer 1; 2. Elastic main layer; 3. Base layer 2. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the scope of protection of the present invention is not limited to the described scope.

[0019] like Figure 1 As shown, the unidirectional elastic waterproof coiled material prepared by the method of the present invention comprises an elastic main layer 2, a base layer 1 is provided on one side of the elastic main layer 2, and a base layer 2 3 is provided on the other side of the elastic main layer 2, the material of the elastic main layer 2 is a thermoplastic elastomer; the materials of the base layers 1 and 2 3 are unidirectionally stretched non-woven fabrics of polyester, nylon or polypropylene.

[0020] Example 1

[0021] The upper and lower base non-woven fabrics are unidirectionally stretched polyester spunlace non-woven fabrics with a gram weight of 40g / m 2 The formula of the middle layer thermoplastic elastomer is: SEBS (42%), PP (21.6%), white oil (15%), calcium carbonate (12%), titanium dioxide (4%), nano clay (3%), zinc stearate (1.0%), calcium stearate (0.5%), nano graphene (0.5%), antioxidant (1010) (0.2%), antioxidant (168) (0.1%), ultraviolet absorber (UV-531) (0.1%).

[0022] The preparation method of the unidirectional elastic waterproof coiled material of this embodiment is as follows: 1) Pour the thermoplastic elastomer particles into a high-speed mixer and start the stirring device. The speed of the stirring device is 600 rpm and the stirring time is 5 minutes. The thermoplastic elastomer particles are initially dispersed evenly. Then, filler materials, functional materials, antioxidants, ultraviolet absorbers, and lubricants are added in sequence according to the proportion. The stirring time is continued for 6 minutes until the solid raw materials are fully mixed.

[0023] 2) Slowly add the oil into the high-speed mixer being stirred in step 1), and reduce the stirring speed to 400 rpm, and then continue stirring for 12 minutes. During the mixing process, increase the jacket temperature of the high-speed mixer to 60°C to allow the oil to fully penetrate into the elastomer until the material is in a uniform state without obvious particles or lumps; 3) The raw materials uniformly mixed in step 2) are conveyed to the hopper of a twin-screw extruder through a screw conveyor, and melted and extruded through the screw extruder; the screw diameter of the twin-screw extruder is 35 mm, and the aspect ratio is 25; the temperature of each section of the extruder is set to 152°C, 152°C, 160°C, and 165°C from the hopper end to the head end, and the screw speed is 20-30 rpm.

[0024] 4) Compound the extruded material in step 3) with the unidirectional stretched nonwoven fabric through a double-roll calender to obtain a unidirectional elastic waterproof membrane; the width is 0.5 meters; the gap of the die head should be controlled at 1mm; the roller pressure is 8 Mpa 5) The unidirectional elastic waterproof membrane obtained in step 4) is introduced into a winding machine through a traction device for winding after cooling and shaping; 6) Wrap the unidirectional elastic waterproofing membrane after step 5) with plastic film, mark the name, specification, model, production date and manufacturer of the membrane on the package, and finally store the packaged membrane in a dry, ventilated and cool warehouse.

[0025] Table 1 is the performance results of the waterproof membrane of Example 1

[0026] Depend on Figure 2-3 It can be seen that the mechanical properties can be clearly seen to be different in the transverse and longitudinal directions, and have the effect of unidirectional elastic stretching. The test specimens prepared from the waterproof membrane samples, the middle elastic body can shrink after the tensile test.

[0027] Depend on Figure 4 It can be seen that after the test specimens prepared from the waterproof membrane samples were treated with thermal oxidation at 115°C for 7 days, only the outer layer of the non-woven fabric showed slight powdering and falling off, and no obvious changes were found. The overall elasticity was still good.

[0028] The mechanical properties of the treated tarpaulin can meet the requirements for use in building waterproofing and can still be maintained after thermal oxidation aging treatment.

[0029] from Figure 5 It can be seen that the waterproof fabric can meet the requirements of standard GB / T 328.10-2007 and can be waterproof for 30 minutes after reaching the specified pressure (60KPa).

[0030] like Figure 7 As shown in the figure, the unidirectional elastic waterproof membrane forms the best adhesion between the waterproof coating and drainage pipe fittings and the cement-based tile adhesive, which ensures the best sealing. Its unidirectional elasticity has higher tear resistance and better solves the damage of the waterproof layer caused by cracking and settlement of the base layer.

[0031] Comparative Example 1 Ordinary polypropylene waterproof membrane, the upper and lower base non-woven fabric materials are polypropylene non-woven fabrics, and the middle layer is LLDPE film raw material.

[0032] Polypropylene non-woven fabric is selected as the base fabric, and its gram weight is generally 40g / ㎡. Polyethylene resin: linear low-density polyethylene (LLDPE) is used, the melt index (MI) of the polyethylene resin is 2g / 10min, and the production thickness is 1.0mm.

[0033] additive: Antioxidant: The added amount is 0.3% of the mass of polyethylene resin, hindered phenol antioxidant 1010.

[0034] Ultraviolet light absorber: The added amount is 0.3% of the mass of polyethylene resin, benzophenone type ultraviolet light absorber.

[0035] Filler: The amount of filler such as calcium carbonate added is controlled at 15% of the mass of polyethylene resin.

[0036] Production process parameters: Ingredient mixing: Add polyethylene resin and additives into a high-speed mixer according to the set ratio. The mixing time is 10 minutes and the mixing temperature is controlled at 60°C to ensure that all components are fully and evenly dispersed.

[0037] Extrusion molding: The mixed materials are melted and extruded through an extruder. The temperature of the extruder is set to: Zone 1 (feeding section): 160°C, to soften the material initially.

[0038] Zone 2 (compression section): 180°C, further plasticizing the material and increasing the pressure.

[0039] The third zone (metering section) is 200℃, which can accurately meter the material and make it reach a uniform melt state.

[0040] Die: 200℃, the melt passes through the die to form a uniform sheet, producing 1.0mm thick waterproof cloth, the die gap is about 1.0-1.05mm.

[0041] Composite process: The extruded polyethylene sheet and the polypropylene non-woven fabric are hot-pressed and composited on a composite equipment. The composite temperature is 160°C, the composite pressure is 0.8MPa, and the composite speed is 10m / min.

[0042] Cooling and shaping: The laminated waterproof cloth is cooled and shaped by cooling rollers. The temperature of the cooling rollers is controlled at 20°C and the cooling time is 1 minute to ensure the dimensional stability and surface flatness of the waterproof cloth.

[0043] Rolling and packaging: The cooled and shaped waterproof cloth is rolled up to a certain length, and the rolling tension is controlled at 10N.

[0044] Table 2 is the performance results of the comparative waterproof membrane

[0045] from Figure 6 It can be seen that after 7 days of thermal oxidative aging treatment at 115°C, the non-woven fabric was severely deformed and brittle, and the white non-woven fabric turned yellow and powdered and fell off, making it impossible to perform tensile performance tests.

[0046] Compared with Example 1, Comparative Example 1 cannot achieve the effect of unidirectional stretching, the middle layer material is not elastic, and there are certain problems in waterproof performance in some harsh environments. At the same time, in terms of aging resistance, it is basically powdered after 4 days of thermal oxidation aging at 115°C, so the long-term waterproof effect cannot be guaranteed.

Claims

1. A unidirectional elastic waterproof roll, characterized in that The invention comprises an elastic main body layer (2), wherein one side of the elastic main body layer (2) is provided with a base layer 1 (1), and the other side of the elastic main body layer (2) is provided with a base layer 2 (3), wherein the material of the elastic main body layer (2) is a thermoplastic elastomer; and the materials of the base layer 1 (1) and the base layer 2 (3) are uniaxially stretched polyester, nylon or polypropylene spunlace non-woven fabrics.

2. A one-way elastic waterproof coiled material according to claim 1, characterized in that The raw material components of the elastic main body layer (2) and the mass percentage of each component in the total amount of raw materials are as follows: Thermoplastic elastomer 30-50%; polyolefin resin 15-20%; oil 15-20%; filling material 5-25%; functional material 0.1-3%; antioxidant 0.2-0.4%; ultraviolet absorber 0.1%- 0.3%; lubricant 1- 2%.

3. A one-way elastic waterproof coiled material according to claim 2, characterized in that The thermoplastic elastomer is a linear triblock copolymer; the polyolefin resin is one of polypropylene or polyethylene; the filling material is one or more of calcium carbonate powder, talcum powder, titanium dioxide, and nano clay; the oil is paraffin-based white oil; the functional material is a nano-sheet layered material; the antioxidant is one or two of hindered phenols and phosphites; the ultraviolet absorber is a benzophenone ultraviolet absorber; and the lubricant is one or two of calcium stearate and zinc stearate.

4. The one-way elastic waterproof coiled material according to claim 3, characterized in that The linear triblock copolymer is a styrene-ethylene-butylene-styrene block copolymer; the functional material is graphene, nanographene or oxidized nanographene; the hindered phenol is 1010 or 330; the phosphite is 168; and the benzophenone ultraviolet absorber is UV-531.

5. A method for preparing the unidirectional elastic waterproof coiled material according to any one of claims 1 to 4, characterized in that The steps include: 1) Pour the thermoplastic elastomer particles into a high-speed mixer, turn on the stirring device to make the thermoplastic elastomer particles preliminarily dispersed evenly, and then add filler materials, functional materials, antioxidants, ultraviolet absorbers, and lubricants in proportion, and continue stirring until all solid raw materials are fully mixed; 2) Slowly add the oil into the high-speed mixer in step 1) while reducing the stirring speed to allow the oil to fully penetrate into the elastomer until the material is uniform and consistent without obvious particles or lumps; 3) The raw materials uniformly mixed in step 2) are conveyed to the hopper of the twin-screw extruder through a screw conveyor, and melted and extruded through the screw extruder; 4) Compounding the material extruded in step 3) with the unidirectionally stretched nonwoven fabric through a double-roll calender to obtain a unidirectional elastic waterproof roll; 5) The unidirectional elastic waterproof membrane obtained in step 4) is introduced into a winding machine through a traction device for winding after cooling and shaping; 6) Wrap the unidirectional elastic waterproofing membrane after step 5) with plastic film, mark the name, specification, model, production date and manufacturer of the membrane on the package, and finally store the packaged membrane in a dry, ventilated and cool warehouse.

6. The method for preparing a unidirectional elastic waterproof coiled material according to claim 5, characterized in that In step 1), the speed of the stirring device is 500-800 rpm, the stirring time is 3-5 minutes, and the stirring time is continued for 5-8 minutes.

7. The method for preparing a unidirectional elastic waterproof coiled material according to claim 5, characterized in that In step 2), the oil is slowly added into the high-speed mixer being stirred in step 1), and the stirring speed is reduced to 300-500 rpm. During the mixing process, the jacket temperature of the high-speed mixer is increased to 60-80°C.

8. The method for preparing a unidirectional elastic waterproof coiled material according to claim 5, characterized in that In step 3), the screw diameter of the twin-screw extruder is 30-50 mm, and the aspect ratio is 25-35; the temperature of each section of the extruder is set to 150-160°C, 150-160°C, 160-170°C, 160-170°C from the hopper end to the head end, and the screw speed is 20-30 rpm.

9. The method for preparing a unidirectional elastic waterproof coiled material according to claim 5, characterized in that In step 4), a T-shaped flat die is selected as the extrusion molding die. The width of the die is determined according to the design width of the coil, generally 0.3-1.2 meters; the gap of the die should be adjusted according to the thickness requirements of the coil, usually controlled between 1-3 mm; by adjusting the opening of the die and the extrusion volume of the extruder, the thickness and width of the coil can be accurately controlled; the roller pressure is 5-10Mpa.

10. The method for preparing a unidirectional elastic waterproof coiled material according to claim 5, characterized in that Step 5) The winding machine adopts a central winding method, the core diameter is 75-100 mm; the winding tension is 50-100 N / m; the winding speed is 3-6 m / min; In step 6), the number of packaging layers is 2-3 layers, and the stacking height is less than 5 layers.

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