阅读说明：本技术 纳米改性耐候性tpo防水卷材 (Nano modified weather-resistant TPO waterproof coiled material ) 是由 王赏 于 2020-12-26 设计创作，主要内容包括：本发明属于防水卷材技术领域,特别涉及一种纳米改性耐候性TPO防水卷材,包括TPO树脂、阻燃剂、分散剂、改性填料和复合插层改性助剂混合后熔融塑化挤出,再经压光、冷却、收卷而制得；所述的复合插层改性助剂是先用过渡金属离子无机盐对蒙脱土进行一次改性处理,然后将一次改性后的蒙脱土分散到溶剂中,升温至60-90℃,加入紫外线吸收剂、有机弱还原剂和自由基捕获剂,冷凝回流1-2小时,得到悬浮液,将悬浮液过滤到沉淀物,用去离子水对沉淀物进行洗涤,然后干燥、研磨,过筛而得到；本发明通过对蒙脱土的改性处理,再将其掺杂到TPO防水卷材中,有效的降低了蒙脱土的表面能,使得蒙脱土层间由亲水性变为亲油性,改善了在聚烯烃树脂内部的分散效果。(The invention belongs to the technical field of waterproof coiled materials, and particularly relates to a nano modified weather-resistant TPO waterproof coiled material which is prepared by mixing TPO resin, a flame retardant, a dispersing agent, a modified filler and a composite intercalation modified auxiliary agent, then performing melt plasticizing extrusion, and then performing calendaring, cooling and rolling; the composite intercalation modification auxiliary agent is obtained by firstly carrying out primary modification treatment on montmorillonite by using transition metal ion inorganic salt, then dispersing the montmorillonite subjected to primary modification into a solvent, heating to 60-90 ℃, adding an ultraviolet absorbent, an organic weak reducing agent and a free radical trapping agent, carrying out condensation reflux for 1-2 hours to obtain a suspension, filtering the suspension to obtain a precipitate, washing the precipitate by using deionized water, drying, grinding and sieving; according to the invention, through modification treatment of the montmorillonite, the montmorillonite is doped into the TPO waterproof coiled material, so that the surface energy of the montmorillonite is effectively reduced, the hydrophilicity of montmorillonite layers is changed into lipophilicity, and the dispersion effect in the polyolefin resin is improved.)

1. A nanometer modified weather-resistant TPO waterproof coiled material is characterized by comprising TPO resin, a flame retardant, a dispersant, modified filler and a composite intercalation modified auxiliary agent which are mixed, then melted, plasticized and extruded, and finally the material is prepared by calendaring, cooling and rolling;

wherein the composite intercalation modification auxiliary agent is prepared by firstly carrying out primary modification treatment on montmorillonite by using transition metal ion inorganic salt, then dispersing the montmorillonite subjected to primary modification into a solvent, heating to 60-90 ℃,

adding ultraviolet absorbent, organic weak reducing agent and free radical trapping agent, condensing and refluxing for 1-2 hours to obtain suspension, filtering the suspension to obtain precipitate, washing the precipitate with deionized water, drying, grinding and sieving to obtain the product.

2. The nano modified weather-resistant TPO waterproof coiled material as claimed in claim 1, wherein the modified filler is obtained by dispersing nano inorganic particles into polydimethyl silane acetone solution, fully mixing and separating, and then placing the nano inorganic particles into an oven to dry.

3. The roll of nano-modified weather-resistant TPO waterproofing membrane according to claim 1, wherein the inorganic salt of transition metal ion is selected from MgCl₂、CaCl₂、FeCl₃、ZnCl₂、ZnSO₄、CuSO₄、Mg(NO₃)₂、Fe(NO₃)₃At least one of (1).

4. The roll of nano modified weather-resistant TPO waterproofing membrane according to claim 1, wherein the montmorillonite is at least one of sodium montmorillonite, calcium montmorillonite, lithium montmorillonite and magnesium montmorillonite.

5. The nano-modified weather-resistant TPO waterproofing membrane according to claim 1, wherein the ultraviolet absorber is at least one selected from the group consisting of 2-hydroxy-4-n-octoxybenzophenone, 2- (2 '-hydroxy-3' -t-butyl-5 '-methylphenyl) -5-chlorobenzotriazole and 2- (2' -hydroxy-3 ',5' -di-t-butylphenyl) -5-chlorobenzotriazole.

6. The nano-modified weather-resistant TPO waterproof roll as claimed in claim 1, wherein the organic weak reducing agent is at least one selected from sodium stannous citrate, sodium ascorbate and potassium sorbate.

7. The nano-modified weather-resistant TPO waterproofing membrane according to claim 1, wherein said radical scavenger is selected from at least one of 2,2,6, 6-tetramethylpiperidine-nitrogen-oxide, 2,2, -diphenyl-1-trinitrophenylhydrazine, p-benzoquinone, tetramethylbenzoquinone and N-t-butyl- α -phenylnitrone; 2,2,6, 6-tetramethylpiperidine-nitrogen-oxide is preferred.

Technical Field

The invention belongs to the technical field of waterproof rolls, and particularly relates to a nano modified weather-resistant TPO waterproof roll.

Background

TPO waterproofing membrane is thermoplastic polyolefin waterproofing membrane, is the Thermoplastic Polyolefin (TPO) synthetic resin that combines ethylene propylene rubber and polypropylene together and is the base stock, adds the novel waterproofing membrane that antioxidant, antiager, softener were made, can make enhancement mode waterproofing membrane with polyester fiber net check cloth as inside reinforcing material, belongs to synthetic polymer waterproofing membrane class waterproof product. The TPO waterproof coiled material integrates the performance characteristics of EPDM and PVC, has the weather resistance, low-temperature flexibility and weldability of the latter, is different from the traditional plastic, shows high rubber elasticity at normal temperature, and can be molded like the plastic at high temperature. Therefore, the material has good processing performance and mechanical property and high-strength welding performance, and after a layer of polyester fiber fabric is additionally arranged between two layers of TPO materials, the physical property of the material can be enhanced, and the breaking strength, fatigue resistance and puncture resistance of the material can be improved.

In the prior art, TPO waterproof coiled materials are easy to age and degrade in the long-term use process, and especially when the TPO waterproof coiled materials are exposed to specific environmental conditions, such as high-energy radiation, ultraviolet shielding, mechanical shearing or high temperature and the like, the TPO waterproof coiled materials are easy to degrade; in addition, TPO waterproofing membranes exposed to roofs also have a negative effect on the TPO waterproofing membranes when exposed to contaminated rainwater due to air pollution, all of which cause a reduction in the life and aging properties of the TPO waterproofing membranes. The reasons for the degradation include depolymerization of the polymer or copolymer, random chain scission, etc., wherein the depolymerization is carried out by a radical mechanism, in particular, under high energy radiation or ultraviolet irradiation, the polyolefin macromolecular chains lose one active hydrogen atom, so that the macromolecular chains form radicals (R ·), which can react with oxygen molecules to generate peroxy radicals (ROO ·), which in turn can extract another hydrogen atom from another polymer chain to generate hydroperoxides (ROOH), which can be split into two new radicals (RO ·) and (OH ·), and the radicals continue to conduct depolymerization reactions to other polyolefin macromolecular chains. In addition, the macromolecular chains may be broken at any location, i.e., randomly, when the polyolefin is heated.

In view of the above problems, the prior art, for example, chinese patent publication No. CN 106364101a, discloses a highly weather-resistant polyolefin waterproof roll and a preparation method thereof, wherein the waterproof roll specifically comprises a relatively thick polyolefin roll layer and a thin weather-resistant film layer, the polyolefin roll layer has good mechanical properties, and the weather-resistant film layer has good weather resistance when exposed to specific harsh environmental conditions in long-term use, and protects the polyolefin roll layer from erosion and degradation. According to the technical scheme, on the basis of keeping the mechanical property of the waterproof coiled material product unchanged, the weather resistance of the waterproof coiled material product is enhanced. And the TPO waterproof coiled material adopts a co-extrusion in-mold composite production process, the weather-resistant film layer and the TPO layer are fused and bonded into a whole, the thickness of each layer of material is accurately controlled by controlling the extrusion amount of each extruder, the production process is simpler, and the production process is more stable.

Also, as disclosed in chinese patent publication No. CN 111875870a, an aging-resistant TPO waterproof roll for construction and a method for preparing the same are disclosed, wherein the method specifically discloses that the preparation process of the waterproof roll is as follows: wetting an aging resistant agent with acetone, uniformly dispersing the aging resistant agent, an emulsifier, a surfactant and water to obtain emulsion, slowly adding a calcium chloride solution to obtain a precursor emulsion, spraying a sodium carbonate solution into the precursor emulsion, stirring, standing, centrifugally separating, drying to obtain a microcapsule aging resistant agent, uniformly mixing the microcapsule aging resistant agent with a copolymer TPO resin, a flame retardant, a dispersing agent and a filler to obtain a TPO waterproof coiled material raw material, and then performing melt plasticizing extrusion, calendaring, cooling, deviation correction, edge cutting, cutting and rolling to obtain the TPO waterproof coiled material. The microcapsule aging resistant agent with the aging resistant agent as the core and the calcium carbonate as the shell structure improves the strength and the heat resistance of the aging resistant agent, meanwhile, the microcapsule aging resistant agent can be uniformly dispersed into the TPO waterproof coiled material, the calcium carbonate shell structure does not influence other properties of the coiled material, and the obtained waterproof coiled material has good mechanical property and stability and excellent aging resistance.

Disclosure of Invention

The invention aims to provide a nano modified weather-resistant TPO waterproof coiled material, which is uniformly dispersed in a resin system forming the TPO waterproof coiled material by modifying an additive realizing the weather-resistant function, so that the TPO waterproof coiled material with strong weather resistance and good mechanical property is ensured to be prepared.

In order to achieve the purpose, the invention adopts the following technical scheme:

a nanometer modified weather-resistant TPO waterproof coiled material is prepared by mixing TPO resin, a flame retardant, a dispersing agent, a modified filler and a composite intercalation modified auxiliary agent, then performing melt plasticizing extrusion, and then performing calendaring, cooling and rolling;

wherein the composite intercalation modification auxiliary agent is prepared by firstly carrying out primary modification treatment on montmorillonite by using transition metal ion inorganic salt, then dispersing the montmorillonite subjected to primary modification into a solvent, heating to 60-90 ℃,

adding ultraviolet absorbent, organic weak reducing agent and free radical trapping agent, condensing and refluxing for 1-2 hours to obtain suspension, filtering the suspension to obtain precipitate, washing the precipitate with deionized water, drying, grinding and sieving to obtain the product.

In a further technical scheme, the modified filler is obtained by dispersing nano-scale inorganic particles into a polydimethylsiloxane acetone solution, fully mixing and separating, and then placing the nano-scale inorganic particles in an oven for drying.

In a further embodiment, the inorganic salt of a transition metal ion is selected from MgCl₂、CaCl₂、FeCl₃、ZnCl₂、ZnSO₄、CuSO₄、Mg(NO₃)₂、Fe(NO₃)₃At least one of (1).

In a further technical scheme, the montmorillonite is at least one of sodium montmorillonite, calcium montmorillonite, lithium montmorillonite and magnesium montmorillonite.

In a further embodiment, the ultraviolet absorber is at least one selected from the group consisting of 2-hydroxy-4-n-octoxybenzophenone, 2- (2 '-hydroxy-3' -tert-butyl-5 '-methylphenyl) -5-chlorobenzotriazole and 2- (2' -hydroxy-3 ',5' -di-tert-butylphenyl) -5-chlorobenzotriazole.

In a further technical scheme, the organic weak reducing agent is selected from at least one of sodium stannous citrate, sodium ascorbate and potassium sorbate.

In a further technical scheme, the free radical trapping agent is selected from at least one of 2,2,6, 6-tetramethylpiperidine-nitrogen-oxide, 2, 2-diphenyl-1-trinitrophenylhydrazine, p-benzoquinone, tetramethylbenzoquinone and N-tertiary butyl-alpha-phenylnitrone; 2,2,6, 6-tetramethylpiperidine-nitrogen-oxide is preferred.

Compared with the prior art, the invention has the following technical effects:

1. according to the technical scheme provided by the invention, the raw materials for preparing the TPO waterproof coiled material contain a composite intercalation modification auxiliary agent, the composite intercalation modification auxiliary agent is obtained by firstly adopting transition metal ion inorganic salt to carry out primary modification treatment on montmorillonite, in the process, the transition metal ions exchange with cations among montmorillonite layers to increase the interlayer distance of the montmorillonite, then adding an anionic ultraviolet absorbent, an organic weak reducing agent and a free radical trapping agent into the composite intercalation modification auxiliary agent, and enabling the ultraviolet absorbent, the organic weak reducing agent and the free radical trapping agent to enter the montmorillonite layers through positive attraction of the cations among the montmorillonite layers to finally obtain a composite assembled montmorillonite intercalation structure; by doping the additive into a TPO waterproof coiled material, the ultraviolet absorbent can block ultraviolet light from degrading polyolefin, high-activity oxygen is absorbed by the reduction action of an organic weak reducing agent, so that the photooxidation of the polyolefin is weakened, active free radicals generated by photodegradation are captured by a free radical capture agent, the adverse effect of the active free radicals on a polyolefin macromolecular chain is reduced, the technical effect of ageing resistance is achieved based on the synergistic effect of the additives, and the problem of poor ageing resistance of the existing single doping is solved; in addition, the basic attribute of the cationic clay is fully utilized by carrying out intercalation modification treatment in the montmorillonite, and the montmorillonite can well adsorb and fix the ultraviolet absorbent, the organic weak reducing agent and the free radical trapping agent; in addition, in the invention, the montmorillonite is modified by the functional components and then doped into the TPO waterproof coiled material, so that the surface energy of the montmorillonite is effectively reduced, the hydrophilicity between montmorillonite layers is changed into lipophilicity, and the dispersion effect of the montmorillonite in the polyolefin resin is improved.

2. According to the technical scheme provided by the invention, raw materials for preparing the TPO waterproof coiled material contain modified filler, wherein the modified filler is obtained by dispersing nanoscale inorganic particles into a polydimethylsiloxane acetone solution, fully mixing and separating the nanoscale inorganic particles, and then placing the nanoscale inorganic particles into an oven for drying; through the treatment mode, the surface of the nano inorganic particle presents oleophylic and hydrophobic performance, so that the nano inorganic particle has better dispersion performance in polyolefin resin, the affinity of the inorganic particle and the polyolefin resin is improved, and better reinforcement effect is realized.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further clarified with the specific embodiments.

All the starting materials in the present invention, the sources of which are not particularly limited, may be either commercially available or prepared according to conventional methods well known to those skilled in the art. All the raw materials used in the present invention are not particularly limited in purity, and the present invention preferably employs a purity which is conventional in the field of analytical purification or composite materials. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available.

The invention provides a nano modified weather-resistant TPO waterproof coiled material which is prepared by mixing TPO resin, a flame retardant, a dispersing agent, a modified filler and a composite intercalation modified auxiliary agent, then performing melt plasticizing extrusion, and then performing calendaring, cooling and rolling; the composite intercalation modification auxiliary agent is obtained by firstly carrying out primary modification treatment on montmorillonite by using transition metal ion inorganic salt, then dispersing the montmorillonite subjected to primary modification into a solvent, heating to 60-90 ℃, adding an ultraviolet absorbent, an organic weak reducing agent and a free radical trapping agent, carrying out condensation reflux for 1-2 hours to obtain a suspension, filtering the suspension to obtain a precipitate, washing the precipitate by using deionized water, drying, grinding and sieving.

In the invention, as the primary modification treatment of montmorillonite, the specific steps are that montmorillonite powder is dispersed into an acid solution, the acid solution is stirred and mixed to obtain a dispersion liquid, then the temperature is raised to 60-90 ℃, transition metal ion inorganic salt is added into the dispersion liquid, the condensation reflux reaction is carried out for 1-3h to obtain a uniform suspension liquid, then the suspension liquid is filtered, and precipitates are washed and dried to obtain the montmorillonite after primary modification;

the type of the acidic solution is not particularly limited, and conventional choices in the field, such as hydrochloric acid, sulfuric acid or nitric acid, can be adopted; the concentration of the acidic solution is not particularly limited, and may be, for example, a 0.1mol/L hydrochloric acid solution; the precipitate may be washed with deionized water or ethanol several times.

The kind of the solvent is not particularly limited in the present invention, and may be selected conventionally in the art, and for the present invention, the solvent is a solvent capable of dissolving the ultraviolet absorber, the organic weak reducing agent and the radical scavenger, such as ethanol, ethylene glycol or glycerol.

According to the invention, the inorganic salt of a transition metal ion is selected from MgCl₂、CaCl₂、FeCl₃、ZnCl₂、ZnSO₄、CuSO₄、Mg(NO₃)₂、Fe(NO₃)₃At least one of (1).

In the invention, the montmorillonite is at least one of sodium montmorillonite, calcium montmorillonite, lithium montmorillonite and magnesium montmorillonite.

In the present invention, the ultraviolet absorber is at least one selected from the group consisting of 2-hydroxy-4-n-octyloxybenzophenone, 2- (2 '-hydroxy-3' -tert-butyl-5 '-methylphenyl) -5-chlorobenzotriazole and 2- (2' -hydroxy-3 ',5' -di-tert-butylphenyl) -5-chlorobenzotriazole.

In the invention, the organic weak reducing agent is at least one selected from sodium stannous citrate, sodium ascorbate and potassium sorbate.

In the invention, the free radical scavenger is at least one selected from 2,2,6, 6-tetramethyl piperidine-nitrogen-oxide, 2, 2-diphenyl-1-trinitrophenylhydrazine, p-benzoquinone, tetramethyl benzoquinone and N-tertiary butyl-alpha-phenyl nitrone; 2,2,6, 6-tetramethylpiperidine-nitrogen-oxide is preferred.

According to the invention, the raw material components for preparing the composite intercalation modification auxiliary agent can be selected in a wide range, and preferably, the composite intercalation modification auxiliary agent is prepared from the following raw materials in parts by weight: 8-20 parts of montmorillonite, 1-4 parts of transition metal ion inorganic salt, 180 parts of solvent, 0.5-2 parts of ultraviolet absorbent, 0.3-1.5 parts of organic weak reducing agent and 0.1-0.6 part of free radical trapping agent.

In the invention, the modified filler is obtained by dispersing nano-scale inorganic particles into a polydimethylsiloxane acetone solution, fully mixing and separating, and then placing the nano-scale inorganic particles into an oven for drying.

The type of the nanoscale inorganic particles is not particularly limited, and conventional selection in the field can be adopted, specifically, the nanoscale inorganic particles can be selected from silica, zinc oxide, titanium dioxide, barium sulfate particles or carbon black, and further, in the invention, the average particle size of the nanoscale inorganic particles is 10-200nm, and more preferably 50-100 nm.

More specifically, each 100g of nano-scale inorganic particles are correspondingly dispersed into 1000mL of 1% polydimethylsiloxane acetone solution, the nano-scale inorganic particles are fully and uniformly mixed and then separated, and then the solid particles are placed in an oven and dried at 120 ℃.

According to the invention, the TPO resin, also called polyolefin thermoplastic elastomer, is a high-performance polyolefin product, has rubber elasticity at normal temperature, and has the characteristics of small density, large bending, high low-temperature impact resistance, easy processing, reusability and the like. The reaction kettle polymerization type thermoplastic polyolefin can be specificallyMention may be made, for example, of Hifax, a company of the Liandra Barcel industries^TMThe series of elastomers, the blended thermoplastic polyolefin, may be exemplified by polymers of ethylene and alpha-olefins, such as Engage8150 manufactured by Dow corporation.

According to the invention, the flame retardant has the function of realizing the flame retardant effect, and aiming at the invention, the flame retardant can be selected from modified magnesium hydroxide, such as ZH-E5 and ZH-E6 which are produced by Wuzi Zehnder chemical industries, Ltd.

In the invention, the dispersing agent is polyethylene wax.

According to the present invention, the amount of the raw material component for producing the TPO waterproof roll can be selected from a wide range, and preferably, the TPO waterproof roll is prepared from the following raw materials in parts by weight: 100-120 parts of TPO resin, 0.5-2 parts of flame retardant, 1-3 parts of dispersant, 5-20 parts of modified filler and 3-10 parts of composite intercalation modified auxiliary agent.

The present invention provides a nano modified weather-resistant TPO waterproof roll, which is further described by the following specific examples.

Example 1

Preparation of a TPO waterproof coiled material:

(1) preparation of composite intercalation modified assistant

Dispersing sodium-based montmorillonite powder (800 mesh, available from Zhejiang Fenghong New Material Co., Ltd.) in 0.1mol/L hydrochloric acid solution, stirring and mixing to obtain dispersion, heating to 80 deg.C, adding transition metal ion inorganic salt MgCl into the dispersion₂Condensing and refluxing for 2h to obtain uniform suspension, filtering the suspension, washing and drying the precipitate to obtain the montmorillonite after primary modification;

dispersing the montmorillonite subjected to primary modification into ethanol, heating to 80 ℃, adding an ultraviolet absorbent 2-hydroxy-4-n-octoxybenzophenone, an organic weak reducing agent sodium stannous citrate and a free radical trapping agent 2,2,6, 6-tetramethylpiperidine-nitrogen-oxide, condensing and refluxing for 2 hours to obtain a suspension, filtering the suspension to obtain a precipitate, washing the precipitate with deionized water, drying, grinding and sieving to obtain the montmorillonite-N-octyloxybenzophenone-N-oxide suspension;

the composite intercalation modification auxiliary agent is prepared from the following raw materials in parts by weight: 15 parts of sodium montmorillonite powder and transition metal ion inorganic salt MgCl₂3 parts of ethanol 150 parts, 1.2 parts of ultraviolet absorbent 2-hydroxy-4-n-octoxybenzophenone, 0.8 part of organic weak reducing agent stannous sodium citrate and 0.5 part of free radical trapping agent 2,2,6, 6-tetramethylpiperidine-nitrogen-oxide;

(2) preparation of modified Filler

Dispersing nano-scale silicon dioxide particles (80nm) into 1% polydimethylsiloxane acetone solution, fully mixing and separating, then putting the solid particles into a drying oven, and drying at 120 ℃ for later use;

(3) adding TPO resin, flame retardant modified magnesium oxide (ZH-E5, purchased from Wuxi Zehui chemical Co., Ltd.), dispersant polyethylene wax, the composite intercalation modifier prepared in the step (1) and the modified filler prepared in the step (2) into a high-speed mixer, stirring and mixing uniformly, then blanking into a double-screw extruder for melting and plasticizing, extruding after pressurizing by a melt pump, and obtaining the TPO waterproof coiled material through the processes of cooling, deviation correction, edge cutting, cutting and rolling;

the TPO waterproof coiled material is prepared from the following raw materials in parts by weight: 100 parts of TPO resin (Engage 8150 produced by Dow company), 1.2 parts of flame retardant modified magnesium oxide (ZH-E5, purchased from Wuxi Zeui chemical Co., Ltd.), 2 parts of dispersant polyethylene wax, 15 parts of modified filler and 8 parts of composite intercalation modified auxiliary agent.

Example 2

The procedure of this example is substantially the same as that of example 1, except that the TPO waterproofing membrane is prepared from the following raw materials in parts by weight: 110 parts of TPO resin (Engage 8150 produced by Dow company), 0.6 part of flame retardant modified magnesium oxide (ZH-E5, purchased from Wuxi Zeui chemical Co., Ltd.), 1 part of dispersant polyethylene wax, 20 parts of modified filler and 5 parts of composite intercalation modification auxiliary agent.

And keeping the balance unchanged, and preparing the waterproof roll.

Example 3

The procedure of this example is substantially the same as that of example 1, except that the TPO waterproofing membrane is prepared from the following raw materials in parts by weight: 120 parts of TPO resin (Engage 8150 produced by Dow company), 0.9 part of flame retardant modified magnesium oxide (ZH-E5, purchased from Wuxi Zeui chemical Co., Ltd.), 1-3 parts of dispersant polyethylene wax, 5 parts of modified filler and 3 parts of composite intercalation modified additive.

And keeping the balance unchanged, and preparing the waterproof roll.

Description of the test:

the waterproof rolls prepared in examples 1 to 3 were subjected to a performance test according to the regulations of "Thermoplastic Polyolefin (TPO) waterproof roll" (GB/T27789-2011) and "building waterproof material aging test method" (GB/T18244).

(1) Tensile Property test

The water-repellent rolls obtained in examples 1 to 3 were cut into 150mm X50 mm samples in the longitudinal (MD) and Transverse (TD) directions, respectively, (wherein MD is a continuous forming method of the water-repellent rolls, and TD is a direction perpendicular thereto)

Measuring the thicknesses of three points in the middle and two ends of the sample by using a thickness meter, and taking the arithmetic average value as the thickness of the sample;

the sample was clamped on the fixture of the tensile testing machine, care was taken to keep the center line of the sample in the length direction on the same line as the center of the fixture of the testing machine, set the fixture to move constantly at a speed of 100mm/min, continuously record the separation distance between the tensile force and the corresponding fixture until the sample broke, calculate the maximum tensile force and elongation, and the test results are summarized in table 1.

(2) Heat treatment dimensional Change Rate test

The waterproof rolls prepared in examples 1 to 3 were cut into square samples of 200mm × 200mm (the side lengths of the square samples were MD direction and TD direction, respectively), the initial dimensions were measured, and then the rolls were left to stand in an air oven at 80 ℃ (note that the rolls could not be stacked), the temperature was maintained for 24 hours, after taking out, the rolls were left to stand under standard test conditions for 24 hours, the dimensions were measured again, the rate of change in the heat-treated dimensions was calculated from the changes in the dimensions before and after the heat treatment, and the test results are summarized in table 1.

(3) Heat aging Performance test

The waterproofing membranes prepared in examples 1 to 3 were subjected to a heat aging test according to the specification of GB/T18244 at 115 ℃ for 672h, and the treated samples were allowed to stand for 24h under standard test conditions and then tested for tensile properties (note that the test in MD and TD directions were carried out separately), and the test results are summarized in Table 1.

(4) Artificial climate accelerated aging performance test

The waterproof rolls prepared in examples 1 to 3 were cut to obtain 300mm × 150mm samples (300 mm corresponding to MD direction and 150mm corresponding to TD direction), placed in an artificial weathering accelerated aging test chamber for xenon arc lamp test with an irradiation time of 2500h, then taken out, allowed to stand for 24h under standard test conditions, and then tested for tensile properties, and the test results are summarized in table 1.

Table 1:

based on the test data, the waterproof roll provided by the invention has excellent aging resistance and can still have better performance maintenance in severe environment.

The foregoing shows and describes the general principles, essential features, and inventive features of this invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.