One-way elastic waterproof roll and preparation method thereof

Abstract

The invention discloses a unidirectional elastic waterproof coiled material and a preparation method thereof. Thermoplastic elastomer particles are poured into a high-speed mixer, a stirring device is turned on to make the particles preliminarily dispersed evenly, and then a filling material, a functional material, an antioxidant, an ultraviolet absorber, a lubricant and a dispersant are sequentially added in proportion, and stirring is continued until the solid raw materials are fully mixed; oil is slowly added into the stirring high-speed mixer, and stirring is continued to allow the oil to fully penetrate into the elastomer until the materials are in a uniform state; the uniformly mixed raw materials are conveyed to a hopper of a twin-screw extruder, melt-extruded, and the extruded materials are compounded with a unidirectional stretched non-woven fabric through a double-roll calender to obtain the unidirectional elastic waterproof coiled material. The coiled material prepared by the invention has a unidirectional elastic stretching effect, and the mechanical properties of the waterproof fabric after treatment meet the requirements for use in building waterproofing, and can still be maintained after thermal oxidation aging treatment.

Description

Technical Field

[0001] The present 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, which result 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. The present invention, through in-depth research on the performance degradation law of waterproof membranes under harsh environmental conditions, found 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 also unsatisfactory and 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 test conditions is carried out.

[0003] The present invention aims to provide a unidirectional elastic waterproofing membrane with high tensile strength, a long aging period, a long service life, and low cost, and its preparation method. Combining a unidirectionally stretched nonwoven fabric with a polyolefin thermoplastic elastomer, it can effectively address engineering leakage issues in various 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 the membrane from 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:

[0006] A unidirectional elastic waterproof roll material, characterized in that it includes an elastic main layer, one side of the elastic main layer is provided with a base layer 1, and the other side of the elastic main layer is provided with a base layer 2, the elastic main layer material is a thermoplastic elastomer; the base layer 1 and base layer 2 materials are unidirectionally stretched polyester, nylon or polypropylene spunlace non-woven fabrics.

[0007] Furthermore, the raw material components of the elastic main layer and the mass percentage of each component in the total raw material are as follows:

[0008] 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%; UV absorber 0.1%-0.3%; lubricant 1-2%.

[0009] Furthermore, the thermoplastic elastomer is a linear triblock copolymer (SEBS); the polyolefin resin is one of polypropylene (PP) or polyethylene (PE); the filler material is one or more of calcium carbonate powder, talc, titanium dioxide, and nanoclay; the oil is paraffin-based white oil; the functional material is a nanosheet material; the antioxidant is one or both of hindered phenols and phosphites; the UV absorber is a benzophenone-based UV absorber; and the lubricant is one or both of calcium stearate and zinc stearate.

[0010] 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.

[0011] The present invention also proposes a method for preparing a unidirectional elastic waterproof membrane, comprising the following steps:

[0012] 1) Pour the thermoplastic elastomer particles into a high-speed mixer and start the stirring device to disperse the thermoplastic elastomer particles evenly. Then, add the filler, functional material, antioxidant, UV absorber, and lubricant in proportion and continue stirring until all the solid raw materials are fully mixed.

[0013] 2) Slowly add the oil to the high-speed mixer stirring in step 1), while reducing the stirring speed. Continue stirring to allow the oil to fully penetrate the elastomer until the material is uniform and consistent without obvious particles or lumps.

[0014] 3) The raw materials mixed uniformly in step 2) are conveyed to the hopper of a twin-screw extruder via a screw conveyor, and melted and extruded through the screw extruder;

[0015] 4) Compounding the material extruded in step 3) with the unidirectionally stretched non-woven fabric through a double-roll calender to obtain a unidirectional elastic waterproof membrane;

[0016] 5) The unidirectional elastic waterproof membrane obtained in step 4) is cooled and shaped, and then introduced into a winder through a traction device for winding;

[0017] 6) Wrap the unidirectional elastic waterproofing membrane after step 5) with plastic film and mark the name, specification, model, production date and manufacturer of the membrane on the package. Finally, store the packaged membrane in a dry, ventilated and cool warehouse.

[0018] Furthermore, in step 1), the rotation 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.

[0019] 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.

[0020] 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 from the hopper end to the head end as follows: 150-160°C, 150-160°C, 160-170°C, 160-170°C, and the screw speed is 20-30 rpm.

[0021] Furthermore, in step 4), a T-shaped flat die is selected as the extrusion die. The die width is determined according to the design width of the coil, generally 0.3-1.2 meters. The die gap should be adjusted according to the thickness requirements of the coil, usually controlled between 1-3 mm. By adjusting the die opening and the extrusion rate of the extruder, the thickness and width of the coil can be precisely controlled. The roller pressure is 5-10 MPa.

[0022] Furthermore, in step 5), the winding machine adopts a center winding method, the core diameter is 75-100 mm; the winding tension is 50-100 N / m; and the winding speed is 3-6 m / min;

[0023] In step 6), the number of packaging layers is 2-3 layers, and the stacking height is less than 5 layers.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] 1) The unidirectional waterproof membrane prepared by the method of the present invention has a unidirectional elastic stretching effect. The mechanical properties of the waterproof membrane after treatment can meet the requirements for use in building waterproofing. After thermal oxidative aging treatment, the waterproofing membrane can still maintain its impermeability and meet the requirements.

[0026] 2) Due to its multi-layer structure and combination of high-quality materials, the unidirectional elastic waterproof membrane prepared by the method of the present invention can easily cope with various harsh climate conditions and complex waterproofing scenarios. Even in humid and waterlogged environments for a long time, it can build an indestructible waterproof line for buildings, effectively preventing leakage and providing a solid guarantee for the safety of building structures and the integrity of internal facilities.

[0027] 3) Compared with traditional waterproof membranes, the unidirectional waterproof membrane prepared by the present invention can better adapt to the slight displacement of the base layer and will not damage the membrane's own performance due to excessive stretching or squeezing. This ensures the waterproof effect while significantly enhancing the stability and adaptability of the entire waterproof system, effectively reducing the risk of leakage caused by structural changes.

[0028] 4) Through the rational use of various additives such as antioxidants and the rigorous screening of raw materials for their weather resistance, the membrane has excellent durability. In the field of building waterproofing, it can consistently maintain excellent waterproof performance and physical and mechanical properties, providing long-lasting and reliable waterproof protection for buildings and significantly reducing maintenance and replacement costs.

[0029] 5) The standardized specifications and convenient construction features of the membrane of the present invention, such as the self-adhesive layer, make it easy to operate and highly efficient during on-site construction. Without complex professional tools and tedious construction processes, construction workers can quickly and accurately lay the membrane in the predetermined position, ensuring a close fit with the base layer without bubbles or wrinkles. This greatly shortens the construction period, reduces construction difficulty and labor costs, and effectively improves the consistency of construction quality and waterproofing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a cross-sectional view of the waterproof membrane of the present invention;

[0031] Figure 2 This is a diagram of the horizontal and vertical test strips prepared for the waterproof membrane sample of Example 1 before tensile testing;

[0032] Figure 3 Rebound diagram of horizontal and vertical test strips after tensile testing of waterproof membrane samples prepared in Example 1;

[0033] Figure 4 This is a test specimen prepared from the waterproof membrane sample of Example 1 after being subjected to thermal oxidative aging treatment at 115°C for 7 days;

[0034] Figure 5 This is a diagram showing the water-impermeability effect of the waterproof membrane sample of Example 1;

[0035] Figure 6 The domestic polypropylene waterproof cloth of Comparative Example 1 was heat-treated at 115°C for 7 days;

[0036] Figure 7 This is a schematic diagram of the use of the unidirectional elastic waterproof membrane of the present invention.

[0037] In the figure: 1. Base layer 1; 2. Elastic main layer; 3. Base layer 2. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments, but the scope of protection of the present invention is not limited to the described scope.

[0039] like Figure 1 As shown, the unidirectional elastic waterproof roll prepared by the method of the present invention includes 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 layer 1 and the base layer 2 3 are unidirectionally stretched polyester, nylon or polypropylene non-woven fabrics.

[0040] Example 1

[0041] 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%), nanoclay (3%), zinc stearate (1.0%), calcium stearate (0.5%), nanographene (0.5%), antioxidant (1010) (0.2%), antioxidant (168) (0.1%), and ultraviolet absorber (UV-531) (0.1%).

[0042] The preparation method of the unidirectional elastic waterproof membrane of this embodiment is as follows:

[0043] 1) Pour the thermoplastic elastomer particles into a high-speed mixer and start the stirring device at 600 rpm for 5 minutes. The thermoplastic elastomer particles are initially dispersed evenly. Then, filler, functional material, antioxidant, UV absorber, and lubricant are added in sequence according to the proportions. Continue stirring for 6 minutes until all the solid raw materials are fully mixed.

[0044] 2) Slowly add the oil to the high-speed mixer being stirred in step 1), while reducing the stirring speed to 400 rpm. 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 the elastomer, until the material is uniform and free of obvious particles or lumps.

[0045] 3) The raw materials mixed in step 2) were conveyed to the hopper of a twin-screw extruder via a screw conveyor and melted and extruded through the screw extruder; the screw diameter of the twin-screw extruder was 35 mm and the aspect ratio was 25; the temperatures of each section of the extruder were set from the hopper end to the die end as follows: 152°C, 152°C, 160°C, and 165°C, and the screw speed was 20-30 rpm.

[0046] 4) Compound the extruded material from 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 die gap should be controlled at 1mm; the roller pressure is 8 MPa

[0047] 5) The unidirectional elastic waterproof membrane obtained in step 4) is cooled and shaped, and then introduced into a winder through a traction device for winding;

[0048] 6) Wrap the unidirectional elastic waterproofing membrane after step 5) with plastic film and mark the name, specification, model, production date and manufacturer of the membrane on the package. Finally, store the packaged membrane in a dry, ventilated and cool warehouse.

[0049] Table 1 is the performance results of the waterproof membrane of Example 1

[0050]

[0051] Depend on Figure 2-3 It can be seen that the mechanical properties can be clearly seen to differ between the transverse and longitudinal directions, showing the effect of unidirectional elastic stretching. In the test specimens prepared from the waterproof membrane samples, the middle elastic body can retract after the tensile test.

[0052] 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 non-woven fabric showed slight powdering and falling off, and no obvious changes were found. The overall material still maintained good elasticity.

[0053] The mechanical properties of the treated waterproof cloth can meet the requirements for use in building waterproofing and can still be maintained after thermal oxidation aging treatment.

[0054] from Figure 5 It can be seen that the waterproof fabric can meet the requirements of the standard GB / T 328.10-2007 and can be waterproof for 30 minutes after reaching the specified pressure (60KPa).

[0055] like Figure 7As 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, which can better solve the problem of waterproof layer damage caused by cracking and settlement of the base layer.

[0056] Comparative Example 1

[0057] 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.

[0058] 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.

[0059] additive:

[0060] Antioxidant: The added amount is 0.3% of the mass of polyethylene resin, hindered phenol antioxidant 1010.

[0061] Ultraviolet absorber: The added amount is 0.3% of the mass of the polyethylene resin, benzophenone type ultraviolet absorber.

[0062] Filler: The addition amount of fillers such as calcium carbonate is controlled at 15% of the mass of polyethylene resin.

[0063] Production process parameters:

[0064] Mixing ingredients: 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.

[0065] Extrusion molding: The mixed material is melted and extruded through an extruder. The temperature of the extruder is set to:

[0066] Zone 1 (feeding section): 160°C, to soften the material initially.

[0067] Zone 2 (compression section): 180°C, further plasticizing the material and increasing the pressure.

[0068] The third zone (metering section) is 200℃, which accurately meters the material and makes it reach a uniform melt state.

[0069] 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.

[0070] Composite process: The extruded polyethylene sheet and the polypropylene non-woven fabric are hot-pressed on a composite equipment at a composite temperature of 160°C, a composite pressure of 0.8 MPa, and a composite speed of 10 m / min.

[0071] Cooling and shaping: The laminated waterproof cloth is cooled and shaped by a cooling roller. The temperature of the cooling roller is controlled at 20°C and the cooling time is 1 minute to ensure the dimensional stability and surface smoothness of the waterproof cloth.

[0072] Rolling and packaging: The cooled and shaped waterproof cloth is rolled up to a certain length, and the rolling tension is controlled at 10N.

[0073] Table 2 is the performance results of the comparative waterproof membrane

[0074]

[0075] 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. The white non-woven fabric turned yellow and powdered and fell off, making it impossible to perform tensile performance testing.

[0076] Compared to Example 1, Comparative Example 1 fails to achieve the desired uniaxial stretching effect, and the intermediate layer material lacks elasticity, resulting in limited waterproofing in harsh environments. Furthermore, in terms of aging resistance, the material essentially pulverizes after four days of thermal oxidative aging at 115°C, thus failing to guarantee long-term waterproofing.

Claims

1. A unidirectional elastic waterproof roll, characterized in that It comprises an elastic main body layer (2), 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), the elastic main body layer (2) is made of a thermoplastic elastomer; the base layer 1 (1) and the base layer 2 (3) are made of uniaxially stretched polyester, nylon or polypropylene spunlace non-woven fabrics; The raw material components of the elastic main body layer (2) 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%; UV absorber 0.1%-0.3%; lubricant 1-2%.

2. A one-way elastic waterproof membrane according to claim 1, characterized in that The thermoplastic elastomer is a linear triblock copolymer; the polyolefin resin is one of polypropylene or polyethylene; the filler material is one or more of calcium carbonate powder, talc, titanium dioxide, and nanoclay; the oil is paraffin-based white oil; the functional material is graphene; the antioxidant is one or both of hindered phenols and phosphites; the UV absorber is a benzophenone-based UV absorber; and the lubricant is one or both of calcium stearate and zinc stearate.

3. The one-way elastic waterproof membrane according to claim 2, characterized in that The linear triblock copolymer is a styrene-ethylene-butylene-styrene block copolymer; the hindered phenol is 1010 or 330; the phosphite is 168; and the benzophenone ultraviolet absorber is UV-531.

4. A method for preparing the unidirectional elastic waterproof roll according to any one of claims 1 to 3, characterized in that The steps include: 1) Pour the thermoplastic elastomer particles into a high-speed mixer and start the stirring device to disperse the thermoplastic elastomer particles evenly. Then, add the filler, functional material, antioxidant, UV absorber, and lubricant in proportion and continue stirring until all the solid raw materials are fully mixed. 2) Slowly add the oil to the high-speed mixer being stirred in step 1) while reducing the stirring speed to allow the oil to fully penetrate the elastomer until the material is uniform and consistent without obvious particles or lumps; 3) The raw materials mixed uniformly in step 2) are conveyed to the hopper of a twin-screw extruder via a screw conveyor, and melted and extruded through the screw extruder; 4) Compounding the material extruded in step 3) with the unidirectionally stretched non-woven fabric through a double-roll calender to obtain a unidirectional elastic waterproof membrane; 5) The unidirectional elastic waterproof membrane obtained in step 4) is cooled and shaped, and then introduced into a winder through a traction device for winding; 6) Wrap the unidirectional elastic waterproofing membrane after step 5) with plastic film and mark the name, specification, model, production date and manufacturer of the membrane on the package. Finally, store the packaged membrane in a dry, ventilated and cool warehouse.

5. The method for preparing a unidirectional elastic waterproof roll according to claim 4, characterized in that In step 1), the speed of the stirring device is 500-800 rpm, and the stirring time is 3-5 minutes; the stirring time is continued for 5-8 minutes.

6. The method for preparing a unidirectional elastic waterproof roll according to claim 4, characterized in that In step 2), the oil is slowly added to 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.

7. The method for preparing a unidirectional elastic waterproof roll according to claim 4, 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 from the hopper end to the head end as follows: 150-160°C, 150-160°C, 160-170°C, 160-170°C, and 20-30 rpm.

8. The method for preparing a unidirectional elastic waterproof roll according to claim 4, characterized in that In step 4), a T-shaped flat die is used as the extrusion die. The die width is determined according to the design width of the coil and is 0.3-1.2 meters. The die gap should be adjusted according to the thickness requirements of the coil and controlled between 1-3 mm. By adjusting the die opening and the extruder output, the thickness and width of the coil can be precisely controlled. The roller pressure is 5-10 MPa.

9. The method for preparing a unidirectional elastic waterproof roll according to claim 4, characterized in that Step 5) The winding machine adopts a center winding method, with a core diameter of 75-100 mm, a winding tension of 50-100 N / m, and a winding speed of 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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