Weathering cracking resistant polymer modified asphalt membrane and preparation method thereof

Abstract

The present application relates to the technical field of modified asphalt waterproofing membrane, and particularly relates to a weathering-cracking-resistant high polymer modified asphalt membrane and a preparation method thereof. The high polymer modified asphalt membrane comprises an upper surface isolation material layer, an upper surface high polymer modified asphalt layer, a middle carcass reinforcing layer, a lower surface high polymer modified asphalt layer and a lower surface isolation material layer. The high polymer modified asphalt comprises the following raw materials: petroleum asphalt, asphalt blending agent, SBS, SBR, SIS, terpene resin and inorganic filler. The high polymer modified asphalt membrane of the present application has no broken slag falling after weathering, and has no surface cracking phenomenon, thereby solving the roof area water leakage and water leakage problems caused by surface weathering and cracking after the membrane construction. The high polymer modified asphalt membrane of the present application has greater bonding strength, better full bonding effect, and significantly better anti-shrinkage capacity than conventional membranes.

Description

Technical Field

[0001] This invention relates to the field of modified bitumen waterproof membrane technology, specifically to a weather-resistant and crack-resistant polymer-modified bitumen membrane and its preparation method. Background Technology

[0002] Polymer-modified bitumen waterproof membrane is a waterproof material with bitumen as the main component. First, modifiers such as SBS, SBR, and SIS are added to the bitumen to improve its high-temperature anti-flow properties and low-temperature anti-brittleness properties, thus obtaining a modified bitumen coating. Then, the modified bitumen coating is applied to the upper and lower surfaces of a polyester-based intermediate layer and covered with a release material. Finally, the membrane is rolled up to form a waterproof membrane.

[0003] In actual construction, polymer-modified bitumen waterproof membranes are mostly applied using a hot-melt spray gun process. For roof waterproofing, modified bitumen membranes with a polyethylene film structure on the upper surface are often used. The inherent structural characteristics of the polyethylene film lead to rapid weathering and cracking after sun exposure, which is particularly pronounced after rain. Specifically, the weathering time for the polyethylene film after construction is approximately 7-15 days, often accompanied by film cracking. This cracking also causes cracking in the modified bitumen layer on the upper surface of the membrane, with crack lengths of approximately 500-800 mm, crack widths of 3-5 mm, and crack depths of 0.2-0.8 mm. When the upper surface of the membrane is exposed to air for extended periods, the crack depth gradually increases, potentially extending to the base layer, thus posing a risk of leakage in the roof waterproofing layer. Furthermore, because ordinary polyethylene film membranes have a short weathering and cracking time, subsequent construction work must be carried out immediately, leading to significant time constraints.

[0004] In addition, the polyethylene film on the surface of the roofing membrane will break into fragments with a diameter of 1.0~1.5mm after weathering. After being washed away by rainwater, these fragments will accumulate in large quantities at the drain outlets, clogging the pipe openings and eventually causing water accumulation on the entire waterproof roof. This increases the chance of roof leaks and greatly reduces the actual effectiveness of the roof waterproofing.

[0005] In recent years, the weathering and cracking problem of polymer-modified bitumen roofing membranes with polyethylene film as the top surface covering material has become increasingly serious in roof waterproofing construction. Membrane manufacturers have conducted numerous experiments, primarily adding antioxidants, UV absorbers, and other anti-aging additives to the polyethylene film covering material. The aim is to prevent weathering and cracking by improving the internal structure or properties of the membrane, but these efforts have yielded minimal results. This is because the polyethylene film itself is very thin, approximately 0.01~0.02mm. Firstly, it is difficult for the modifier to disperse evenly within the film; secondly, the amount of modifier dispersed per unit area is very small, resulting in the material failing to achieve the expected anti-aging effect. Increasing the thickness of the polyethylene film, while appropriately improving anti-aging performance and delaying weathering and cracking, also increases construction and manufacturing costs. Furthermore, increased film thickness makes it difficult for the film to melt during the baking process. Unmelted polyethylene film forms a separation layer between the base layer and the modified bitumen layer, preventing full adhesion of the membrane's underside and leading to poor bonding and water seepage.

[0006] Therefore, in order to ensure that the polyethylene film on the surface of the polymer-modified bitumen membrane used in the roof waterproofing construction process is more weather-resistant, does not crack after construction, and does not produce debris accumulation after the membrane weathers, it is necessary to develop a weather-resistant and crack-resistant polymer-modified bitumen membrane. Summary of the Invention

[0007] To address the technical problem of the poor weather resistance of the polyethylene film on the surface of polymer-modified bitumen roofing membranes, this invention provides a weather-resistant polymer-modified bitumen roofing membrane and its preparation method. After weathering, the polymer-modified bitumen roofing membrane of this invention does not shed debris or crack on the surface, thus solving the problem of roof water accumulation and leakage caused by surface weathering and cracking after membrane construction. Furthermore, the polymer-modified bitumen roofing membrane of this invention has greater bonding strength, better full adhesion, and significantly better shrinkage resistance than conventional roofing membranes.

[0008] In a first aspect, the present invention provides a weather-resistant and crack-resistant polymer-modified bitumen roll, comprising, from top to bottom, an upper surface isolation material layer, an upper surface polymer-modified bitumen layer, an intermediate matrix reinforcement layer, a lower surface polymer-modified bitumen layer, and a lower surface isolation material layer;

[0009] The polymer-modified asphalt used in the upper and lower surface polymer-modified asphalt layers comprises the following raw materials in parts by weight:

[0010] 55-70 parts petroleum asphalt, 15-25 parts asphalt modifier, 8-15 parts SBS, 5-8 parts SBR, 3-6 parts SIS, 3-5 parts terpene resin, and 10-20 parts inorganic filler.

[0011] Furthermore, the petroleum asphalt is 70# naphthenic petroleum asphalt, with a penetration test value of 68~72, and the penetration measurement unit is 0.1mm.

[0012] Furthermore, the asphalt modifier includes naphthenic oil, aromatic oil, and Sasobit modifier at mass percentages of 65%~80%, 17%~30%, and 3%~5%, respectively.

[0013] Furthermore, the SBS is linear SBS with a molecular weight of 80,000 to 150,000, a melt flow rate of 0.05 to 5 g / 10 min, and a styrene content of 28% to 42%. Modified bitumen prepared with styrene-butadiene-styrene block copolymer (SBS) as a modifier can impart high tensile strength and high elongation to the roofing membrane, and has strong adaptability to base layer shrinkage, deformation, and cracking.

[0014] Furthermore, the SBR is a particulate SBR with an ash content of less than 50%.

[0015] Furthermore, SIS is composed of polystyrene segments, polyisoprene segments, and polystyrene segments intercalated, forming a linear structure with a block ratio of 25 / 75.

[0016] Furthermore, the inorganic filler is talc powder, and the preferred particle size of the talc powder is 80-140 mesh.

[0017] Furthermore, the preparation method of polymer-modified bitumen includes the following steps:

[0018] S1: Add the melted petroleum asphalt to the mixing tank, add the asphalt modifier at an ambient temperature of 150~160℃, and stir for 30~35 minutes;

[0019] S2: When the temperature is raised to 160~170℃, add SBS, SBR and SIS in sequence, stir for 30min, and the stirring speed is 300~400r / min;

[0020] S3: Start the single-tank grinding system of the batching tank, set the grinding disc gap to 0.15~0.20, keep the temperature of the batching tank at 170~180℃, and continue stirring for 4~5 hours;

[0021] S4: When the mixture is fully developed and there are no obvious particles, turn off the single-tank grinding system;

[0022] S5: Turn on the feed circulation pump to transfer the fully developed mixture to the powder tank, add inorganic filler, maintain the mixing speed of the powder tank at 200~300r / min, keep the mixing temperature at 160~170℃, and mix for 30 minutes to make polymer modified asphalt.

[0023] Furthermore, the viscosity of polymer-modified bitumen is 20,000~35,000 mPa·s.

[0024] Furthermore, both the upper and lower surface isolation material layers are made of corona-treated polyethylene film. The corona-treated polyethylene film and the modified asphalt layer can achieve a skin-like full adhesion effect, which is stronger than the adhesion between traditional polyethylene film and modified asphalt.

[0025] Furthermore, the intermediate reinforcing layer uses a reinforced long-filament polyester fiber base, with high-strength glass fiber filaments used for reinforcement, and a reinforcement density of 6-10 filaments / meter. The reinforced base effectively prevents shrinkage after the roll material is hot-melted during construction, and can greatly improve the tensile strength and deformation resistance of the base, resulting in superior performance compared to traditional unreinforced bases.

[0026] Secondly, the present invention provides a method for preparing the above-mentioned polymer-modified bitumen roll material, comprising the following steps:

[0027] (1) Unfold the tire base and dry it at a temperature of 190~200℃;

[0028] (2) The dried tire base is pre-impregnated with oil for sealing. The softening point of the pre-impregnated oil is 65~85℃, the temperature of the pre-impregnated oil is 185~195℃, and the pre-impregnated oil adopts the "two-impregnation and two-press" process.

[0029] (3) Cool and vent the tire base after oil immersion to reduce the tire base temperature to 40~60℃;

[0030] (4) The cooled oil-impregnated tire base coated with polymer-modified asphalt is subjected to a second roll-press sealing treatment at a temperature of 175~185℃.

[0031] (5) The base material after being sealed again is introduced into the oiling tank, and polymer modified asphalt is coated on the upper and lower surfaces of the base material respectively. The coating temperature is 175~185℃. Then, the base material is shaped and processed to produce a polymer modified asphalt roll semi-finished product of specified thickness.

[0032] (6) Adjust the production speed to 25~35m / min, flatten the lower surface isolation material and cover it on the lower surface of the semi-finished product. Control the film tension at 0.1~0.3N and adjust the film feeding speed to 25~35m / min.

[0033] (7) After flattening the upper surface isolation material, cover it onto the upper surface of the semi-finished product to make a polymer modified bitumen roll product. The film tension is controlled at 0.15~0.35N, and the film feeding speed is adjusted to 25~35m / min.

[0034] (8) Immerse the finished polymer-modified bitumen roll in circulating cooling water at a temperature of 15-25°C. After cooling, the surface temperature of the roll is controlled at 25-35°C.

[0035] (9) Embossing treatment is applied to the roll material, with an embossing roller pressure of 0.3~0.4 MPa;

[0036] (10) The embossed roll material is cooled on a storage rack. The cooling of the storage rack is carried out by a combination of air cooling and cooling rollers. The temperature of the cold air is 25~30℃ and the temperature of the cooling rollers is 15~25℃.

[0037] (11) Rewinding: The surface temperature of the roll is less than 35°C after rewinding.

[0038] The beneficial effects of this invention are as follows:

[0039] (1) By making innovative adjustments to the polymer-modified asphalt formulation and combining it with low-temperature batching process, the initial characteristics of the polymer modifier are maintained to the maximum extent, and the aging resistance of the material is greatly improved. The innovative use of asphalt modifier not only greatly reduces the viscosity of polymer-modified asphalt, but also improves the surface adhesion of the roll coating material. Combined with the selected corona-treated polyethylene film, it ensures that the roll film material and the modified asphalt layer achieve perfect skin-like adhesion, which can firmly lock the weathered covering material fragments on the roll surface and prevent them from being washed away by rain and strong winds.

[0040] (2) The improved roll forming process solves the problem of excessive film tension during the roll coating process. The resulting transverse water ripple pattern effectively solves the problem of cracking after the roll is exposed to the sun after hot-melt construction, and greatly extends the weathering time of the polyethylene covering material, which solves the contradiction between the construction period of waterproofing construction and the construction period of subsequent projects. In the roll forming stage, the combination of low temperature constant temperature water and other cooling processes achieves the purpose of stress release in the roll production line stage. At the same time, the use of reinforced base ensures that the roll is firmly bonded to the base surface after hot-melt construction and there are no shrinkage crack defects, which greatly improves the waterproofing effect of hot-melt construction of roof rolls.

[0041] (3) The weathering time of the polyethylene film on the upper surface of the polymer modified bitumen roll provided by the present invention can be effectively extended to 50 days after construction, which is 4 times longer than the weathering time of ordinary roll surface, greatly expanding the subsequent construction period of roof roll and solving the problem of time difference. Detailed Implementation

[0042] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0043] Example 1

[0044] 1. Preparation of polymer-modified asphalt

[0045] The raw materials prepared by weight are as follows: 55 parts of 70# naphthenic petroleum asphalt, 25 parts of asphalt modifier, 8 parts of linear SBS, 5 parts of granular SBR, 3 parts of SIS, 3 parts of terpene resin and 10 parts of talc.

[0046] Among them, the penetration value of 70# naphthenic petroleum asphalt is 68, and the unit of penetration measurement is 0.1 mm; the asphalt modifier includes 65 wt% naphthenic oil, 30 wt% aromatic oil and 5 wt% Sasobit modifier; the linear SBS has a molecular weight of 100,000, a melt flow rate of 4.5 g / 10 min and a styrene content of 30%; the ash content of particulate SBR is less than 50%; SIS is composed of polystyrene segments-polyisoprene segments-polystyrene segments intercalated, with a linear structure and a block ratio of 25 / 75; the talc powder has a particle size of 140 mesh.

[0047] Melted petroleum asphalt is added to a batching tank. At an ambient temperature of 150°C, asphalt modifier is added and stirred for 30 minutes. The temperature is then raised to 170°C, and linear SBS, granular SBR, and SIS are added sequentially, stirring for 30 minutes at a speed of 400 r / min. The single-tank grinding system of the batching tank is then activated, with the grinding disc gap set to 0.20 mm. The temperature of the batching tank is maintained at 170-175°C, and stirring is continued for 4 hours. Once the mixture is fully developed and free of obvious particles, the single-tank grinding system is shut off. The feed circulation pump is activated to transfer the fully developed mixture to a powder tank, and talc powder is added. The stirring speed in the powder tank is maintained at 280 r / min, and the stirring temperature is kept at 165-170°C. Stirring for 30 minutes yields polymer-modified asphalt with a viscosity of 33000 mPa·s.

[0048] 2. Preparation of polymer-modified bitumen rolls

[0049] S1: Unfold the reinforced long filament polyester fiber base, the reinforcement is made of high-strength glass fiber filament, the reinforcement density is 10 filaments / meter, and dry it at 195℃.

[0050] S2: The dried tire base is pre-impregnated with oil for sealing. The softening point of the pre-impregnated oil is 80℃, the pre-impregnated oil temperature is 185℃, and the pre-impregnated oil adopts the "two-impregnation and two-press" process.

[0051] S3: Cool and degas the tire base after oil immersion to reduce the tire base temperature to 45℃;

[0052] S4: The cooled oil-impregnated tire base coated with polymer-modified asphalt is subjected to a second roll-press sealing treatment at a temperature of 175℃.

[0053] S5: The resealed base is introduced into the oiling tank, and polymer-modified asphalt is coated on the upper and lower surfaces of the base at a coating temperature of 175℃. Then, it is shaped by a shaping roller to produce a polymer-modified asphalt roll semi-finished product.

[0054] S6: Adjust the production speed to 25m / min, flatten the corona-treated polyethylene film with the flattening roller and cover it on the lower surface of the semi-finished product. Control the film tension at 0.15N and adjust the film feeding speed to 25m / min.

[0055] S7: After the corona-treated polyethylene film is flattened by a flattening roller, it is covered onto the surface of the semi-finished product to form a polymer-modified asphalt roll material. The film tension is controlled at 0.20N and the film feeding speed is adjusted to 25m / min.

[0056] S8: Immerse the polymer-modified bitumen roll in circulating cooling water at a temperature of 15°C, and control the surface temperature of the roll at 25°C after cooling.

[0057] S9: Embossing of roll materials is performed using embossing rollers with a pressure of 0.35 MPa;

[0058] S10: The embossed roll material is cooled on a storage rack. The cooling of the storage rack is carried out by a combination of air cooling and cooling rollers. The temperature of the cold air is 25℃ and the temperature of the cooling rollers is 25℃.

[0059] S11: Correct and rewind the cooled roll material. After rewinding, the surface temperature of the roll material is less than 35℃, thus obtaining a polymer-modified bitumen roll material resistant to weathering and cracking.

[0060] Example 2

[0061] 1. Preparation of polymer-modified asphalt

[0062] The raw materials prepared by weight are as follows: 60 parts of 70# naphthenic petroleum asphalt, 20 parts of asphalt modifier, 10 parts of linear SBS, 6 parts of granular SBR, 3 parts of SIS, 4 parts of terpene resin and 15 parts of talc.

[0063] Among them, the penetration value of 70# naphthenic petroleum asphalt is 68, and the unit of penetration measurement is 0.1 mm; the asphalt modifier includes 65 wt% naphthenic oil, 30 wt% aromatic oil and 5 wt% Sasobit modifier; the linear SBS has a molecular weight of 100,000, a melt flow rate of 4.5 g / 10 min and a styrene content of 30%; the ash content of particulate SBR is less than 50%; SIS is composed of polystyrene segments-polyisoprene segments-polystyrene segments intercalated, with a linear structure and a block ratio of 25 / 75; the talc powder has a particle size of 140 mesh.

[0064] Melted petroleum asphalt is added to a batching tank. At an ambient temperature of 155°C, asphalt modifier is added and stirred for 35 minutes. The temperature is then raised to 165°C, and linear SBS, granular SBR, and SIS are added sequentially, stirred for 30 minutes at a stirring speed of 350 r / min. The single-tank grinding system of the batching tank is then turned on, with the grinding disc gap set to 0.15 mm. The temperature of the batching tank is maintained at 175-180°C, and stirring is continued for 4 hours. Once the mixture is fully developed and free of obvious particles, the single-tank grinding system is turned off. The feed circulation pump is then turned on to transfer the fully developed mixture to a powder tank, and talc powder is added. The stirring speed in the powder tank is maintained at 250 r / min, and the stirring temperature is kept at 165-170°C. Stirring for 30 minutes yields polymer-modified asphalt with a viscosity of 32000 mPa·s.

[0065] 2. Preparation of polymer-modified bitumen rolls

[0066] S1: Unfold the reinforced long filament polyester fiber base, the reinforcement is made of high-strength glass fiber filament, the reinforcement density is 10 filaments / meter, and dry it at 190℃.

[0067] S2: The dried tire base is pre-impregnated with oil for sealing. The softening point of the pre-impregnated oil is 75℃, the pre-impregnated oil temperature is 185℃, and the pre-impregnated oil adopts the "two-impregnation and two-press" process.

[0068] S3: Cool and degas the tire base after oil immersion to reduce the tire base temperature to 45℃;

[0069] S4: The cooled oil-impregnated tire base coated with polymer-modified asphalt is subjected to a second roll-press sealing treatment at a temperature of 180℃.

[0070] S5: The resealed base is introduced into the oiling tank, and polymer-modified asphalt is coated on the upper and lower surfaces of the base at a coating temperature of 180℃. Then, it is shaped by a shaping roller to produce a polymer-modified asphalt roll semi-finished product.

[0071] S6: Adjust the production speed to 35m / min, flatten the corona-treated polyethylene film with the flattening roller and cover it on the lower surface of the semi-finished product. Control the film tension at 0.25N and adjust the film feeding speed to 35m / min.

[0072] S7: After the corona-treated polyethylene film is flattened by a flattening roller, it is covered onto the surface of the semi-finished product to make a polymer-modified asphalt roll material. The film tension is controlled at 0.30N and the film feeding speed is adjusted to 35m / min.

[0073] S8: Immerse the polymer-modified bitumen roll in circulating cooling water at a temperature of 20°C, and control the surface temperature of the roll at 35°C after cooling.

[0074] S9: Embossing of the roll material is performed using embossing rollers with a pressure of 0.3 MPa;

[0075] S10: The embossed roll material is cooled on a storage rack. The cooling of the storage rack is carried out by a combination of air cooling and cooling rollers. The temperature of the cold air is 25℃ and the temperature of the cooling rollers is 20℃.

[0076] S11: Correct and rewind the cooled roll material. After rewinding, the surface temperature of the roll material is less than 35℃, thus obtaining a polymer-modified bitumen roll material resistant to weathering and cracking.

[0077] Example 3

[0078] 1. Preparation of polymer-modified asphalt

[0079] The raw materials prepared by weight are as follows: 65 parts of 70# naphthenic petroleum asphalt, 15 parts of asphalt modifier, 12 parts of linear SBS, 6 parts of granular SBR, 5 parts of SIS, 5 parts of terpene resin and 20 parts of talc.

[0080] Among them, the penetration value of 70# naphthenic petroleum asphalt is 68, and the unit of penetration measurement is 0.1 mm; the asphalt modifier includes 65 wt% naphthenic oil, 30 wt% aromatic oil and 5 wt% Sasobit modifier; the linear SBS has a molecular weight of 100,000, a melt flow rate of 4.5 g / 10 min and a styrene content of 30%; the ash content of particulate SBR is less than 50%; SIS is composed of polystyrene segments-polyisoprene segments-polystyrene segments intercalated, with a linear structure and a block ratio of 25 / 75; the talc powder has a particle size of 140 mesh.

[0081] Melted petroleum asphalt is added to a batching tank. At an ambient temperature of 160°C, asphalt modifier is added and stirred for 35 minutes. The temperature is then raised to 170°C, and linear SBS, granular SBR, and SIS are added sequentially, stirred for 30 minutes at a stirring speed of 400 r / min. The single-tank grinding system of the batching tank is then turned on, with the grinding disc gap set to 0.20 mm. The temperature of the batching tank is maintained at 170-175°C, and stirring is continued for 4.5 hours. Once the mixture is fully developed and free of obvious particles, the single-tank grinding system is turned off. The feed circulation pump is then turned on to transfer the fully developed mixture to a powder tank, and talc powder is added. The stirring speed in the powder tank is maintained at 280 r / min, and the stirring temperature is kept at 165-170°C. Stirring for 30 minutes yields polymer-modified asphalt with a viscosity of 25000 mPa·s.

[0082] 2. Preparation of polymer-modified bitumen rolls

[0083] S1: Unfold the reinforced long filament polyester fiber base, the reinforcement is made of high-strength glass fiber filament, the reinforcement density is 10 filaments / meter, and dry it at 195℃.

[0084] S2: The dried tire base is pre-impregnated with oil for sealing. The softening point of the pre-impregnated oil is 65℃, the pre-impregnated oil temperature is 185℃, and the pre-impregnated oil adopts the "two-impregnation and two-press" process.

[0085] S3: Cool and degas the oil-soaked tire base to reduce the tire base temperature to 60°C;

[0086] S4: The cooled oil-impregnated tire base coated with polymer-modified asphalt is subjected to a second roll-press sealing treatment at a temperature of 175℃.

[0087] S5: The resealed base is introduced into the oiling tank, and polymer-modified asphalt is coated on the upper and lower surfaces of the base at a coating temperature of 175℃. Then, it is shaped by a shaping roller to produce a polymer-modified asphalt roll semi-finished product.

[0088] S6: Adjust the production speed to 30m / min, flatten the corona-treated polyethylene film with the flattening roller and cover it on the lower surface of the semi-finished product. Control the film tension at 0.15N and adjust the film feeding speed to 25m / min.

[0089] S7: After the corona-treated polyethylene film is flattened by a flattening roller, it is covered onto the surface of the semi-finished product to make a polymer-modified asphalt roll material. The film tension is controlled at 0.15N and the film feeding speed is adjusted to 25m / min.

[0090] S8: Immerse the polymer-modified bitumen roll in circulating cooling water at a temperature of 15°C, and control the surface temperature of the roll at 35°C after cooling.

[0091] S9: Embossing of the roll material is performed using embossing rollers with a pressure of 0.3 MPa;

[0092] S10: The embossed roll material is cooled on a storage rack. The cooling of the storage rack is carried out by a combination of air cooling and cooling rollers. The temperature of the cold air is 30℃ and the temperature of the cooling rollers is 25℃.

[0093] S11: Correct and rewind the cooled roll material. After rewinding, the surface temperature of the roll material is less than 35℃, thus obtaining a polymer-modified bitumen roll material resistant to weathering and cracking.

[0094] Comparative Example 1

[0095] 1. Preparation of polymer-modified asphalt

[0096] The raw materials prepared by weight are as follows: 55 parts of 70# naphthenic petroleum asphalt, 20 parts of softening oil, 15 parts of linear SBS and 10 parts of talc.

[0097] Among them, the penetration value of 70# naphthenic petroleum asphalt is 68, and the unit of penetration measurement is 0.1 mm; the molecular weight of linear SBS is 100,000, the melt flow rate is 4.5 g / 10 min, the styrene content is 30%; and the talc particle size is 140 mesh.

[0098] Melted petroleum asphalt is added to a mixing tank. Softening oil is added at an ambient temperature of 160℃, and the mixture is stirred for 30 minutes. The temperature is then raised to 195℃, and linear SBS is added sequentially. The mixture is stirred for 4 hours at a speed of 350 r / min. Once the mixture is fully developed and free of obvious particles, the feed circulation pump is turned on to transfer the fully developed mixture to a powder tank. Talc powder is added, and the stirring speed in the powder tank is maintained at 280 r / min. The stirring temperature is kept at 165~170℃, and the mixture is stirred for 30 minutes to produce polymer-modified asphalt with a viscosity of 35000 mPa·s.

[0099] 2. Preparation of polymer-modified bitumen rolls

[0100] S1: Unfold the ordinary long-filament polyester fiber base and dry it at 195°C;

[0101] S2: The dried tire base is pre-impregnated with oil for sealing. The softening point of the pre-impregnated oil is 65℃, the pre-impregnated oil temperature is 185℃, and the pre-impregnated oil adopts the "one-impregnation-one-press" process.

[0102] S3: Cool and degas the oil-soaked tire base to reduce the tire base temperature to 130℃;

[0103] S4: The oil-impregnated base material is introduced into the oil coating tank, and polymer-modified asphalt is coated on the upper and lower surfaces of the base material respectively. The coating temperature is 185℃. Then, it is shaped by the shaping roller to produce a polymer-modified asphalt roll semi-finished product.

[0104] S5: Adjust the production speed to 30m / min, and apply the corona-treated polyethylene film to the lower surface of the semi-finished product using a coating roller;

[0105] S6: Then, the corona-treated polyethylene film is coated onto the surface of the semi-finished product using a coating roller to produce a polymer-modified asphalt roll product.

[0106] S8: Immerse the polymer-modified bitumen roll in circulating cooling water;

[0107] S9: Embossing of the roll material is performed using embossing rollers with a pressure of 0.3 MPa;

[0108] S10: The embossed roll material is cooled on a storage rack. The cooling of the storage rack is carried out by a combination of air cooling and cooling rollers. The temperature of the cold air is 25℃ and the temperature of the cooling rollers is 25℃.

[0109] S11: Correct and rewind the cooled roll material. After rewinding, the surface temperature of the roll material is less than 35℃, thus obtaining a polymer-modified bitumen roll material resistant to weathering and cracking.

[0110] Comparative Example 2

[0111] 1. Preparation of polymer-modified asphalt

[0112] The raw materials prepared by weight are as follows: 65 parts of 70# naphthenic petroleum asphalt, 20 parts of softening oil, 15 parts of linear SBS and 10 parts of talc.

[0113] Among them, the penetration value of 70# naphthenic petroleum asphalt is 68, and the unit of penetration measurement is 0.1 mm; the molecular weight of linear SBS is 100,000, the melt flow rate is 4.5 g / 10 min, the styrene content is 30%; and the talc particle size is 140 mesh.

[0114] Melted petroleum asphalt is added to a mixing tank. Softening oil is added at an ambient temperature of 160℃, and the mixture is stirred for 30 minutes. The temperature is then raised to 195℃, and linear SBS is added sequentially. The mixture is stirred for 4 hours at a speed of 350 r / min. Once the mixture is fully developed and free of obvious particles, the feed circulation pump is turned on to transfer the fully developed mixture to a powder tank. Talc powder is added, and the stirring speed in the powder tank is maintained at 280 r / min. The stirring temperature is kept at 165~170℃, and the mixture is stirred for 30 minutes to produce polymer-modified asphalt with a viscosity of 35000 mPa·s.

[0115] 2. Preparation of polymer-modified bitumen rolls

[0116] S1: Unfold the ordinary long-filament polyester fiber base and dry it at 195°C;

[0117] S2: The dried tire base is pre-impregnated with oil for sealing. The softening point of the pre-impregnated oil is 65℃, the pre-impregnated oil temperature is 185℃, and the pre-impregnated oil adopts the "two-impregnation and two-press" process.

[0118] S3: Cool and degas the oil-soaked tire base to reduce the tire base temperature to 60°C;

[0119] S4: The cooled oil-impregnated tire base coated with polymer-modified asphalt is subjected to a second roll-press sealing treatment at a temperature of 175℃.

[0120] S5: The resealed base is introduced into the oiling tank, and polymer-modified asphalt is coated on the upper and lower surfaces of the base at a coating temperature of 175℃. Then, it is shaped by a shaping roller to produce a polymer-modified asphalt roll semi-finished product.

[0121] S6: Adjust the production speed to 30m / min, flatten the corona-treated polyethylene film with the flattening roller and cover it on the lower surface of the semi-finished product. Control the film tension at 0.15N and adjust the film feeding speed to 25m / min.

[0122] S7: After the corona-treated polyethylene film is flattened by a flattening roller, it is covered onto the surface of the semi-finished product to make a polymer-modified asphalt roll material. The film tension is controlled at 0.15N and the film feeding speed is adjusted to 25m / min.

[0123] S8: Immerse the polymer-modified bitumen roll in circulating cooling water at a temperature of 15°C, and control the surface temperature of the roll at 35°C after cooling.

[0124] S9: Embossing of the roll material is performed using embossing rollers with a pressure of 0.3 MPa;

[0125] S10: The embossed roll material is cooled on a storage rack. The cooling of the storage rack is carried out by a combination of air cooling and cooling rollers. The temperature of the cold air is 30℃ and the temperature of the cooling rollers is 25℃.

[0126] S11: Correct and rewind the cooled roll material. After rewinding, the surface temperature of the roll material is less than 35℃, thus obtaining a polymer-modified bitumen roll material resistant to weathering and cracking.

[0127] Comparative Example 3

[0128] 1. Preparation of polymer-modified asphalt

[0129] The raw materials prepared by weight are as follows: 65 parts of 70# naphthenic petroleum asphalt, 20 parts of asphalt modifier, 25 parts of linear SBS and 10 parts of talc powder;

[0130] The 70# naphthenic petroleum asphalt has a penetration value of 68, with a penetration unit of 0.1 mm; the asphalt modifier includes 65 wt% naphthenic oil, 30 wt% aromatic oil, and 5 wt% Sasobit modifier; the linear SBS has a molecular weight of 100,000, a melt flow rate of 4.5 g / 10 min, and a styrene content of 30%; the talc powder has a particle size of 140 mesh.

[0131] Melted petroleum asphalt is added to a mixing tank. At an ambient temperature of 160°C, asphalt modifier is added and stirred for 35 minutes. The temperature is then raised to 170°C, and linear SBS is added sequentially, stirring for 30 minutes at a speed of 350 r / min. The single-tank grinding system of the mixing tank is then activated, with the grinding disc gap set to 0.20 mm. The mixing tank temperature is maintained at 170-175°C, and stirring is continued for 4 hours. Once the mixture is fully developed and free of obvious particles, the single-tank grinding system is shut off. The feed circulation pump is activated to transfer the fully developed mixture to a powder tank, and talc powder is added. The powder tank stirring speed is maintained at 280 r / min, and the stirring temperature is kept at 165-170°C. Stirring for 30 minutes yields polymer-modified asphalt with a viscosity of 25000 mPa·s.

[0132] 2. Preparation of polymer-modified bitumen rolls

[0133] S1: Unfold the ordinary long-filament polyester fiber base and dry it at 195°C;

[0134] S2: The dried tire base is pre-impregnated with oil for sealing. The softening point of the pre-impregnated oil is 65℃, the pre-impregnated oil temperature is 185℃, and the pre-impregnated oil adopts the "two-impregnation and two-press" process.

[0135] S3: Cool and degas the oil-soaked tire base to reduce the tire base temperature to 60°C;

[0136] S4: The cooled oil-impregnated tire base coated with polymer-modified asphalt is subjected to a second roll-press sealing treatment at a temperature of 175℃.

[0137] S5: The resealed base is introduced into the oiling tank, and polymer-modified asphalt is coated on the upper and lower surfaces of the base at a coating temperature of 175℃. Then, it is shaped by a shaping roller to produce a polymer-modified asphalt roll semi-finished product.

[0138] S6: Adjust the production speed to 30m / min, flatten the corona-treated polyethylene film with the flattening roller and cover it on the lower surface of the semi-finished product. Control the film tension at 0.15N and adjust the film feeding speed to 25m / min.

[0139] S7: After the corona-treated polyethylene film is flattened by a flattening roller, it is covered onto the surface of the semi-finished product to make a polymer-modified asphalt roll material. The film tension is controlled at 0.15N and the film feeding speed is adjusted to 25m / min.

[0140] S8: Immerse the polymer-modified bitumen roll in circulating cooling water at a temperature of 15°C, and control the surface temperature of the roll at 35°C after cooling.

[0141] S9: Embossing of the roll material is performed using embossing rollers with a pressure of 0.3 MPa;

[0142] S10: The embossed roll material is cooled on a storage rack. The cooling of the storage rack is carried out by a combination of air cooling and cooling rollers. The temperature of the cold air is 30℃ and the temperature of the cooling rollers is 25℃.

[0143] S11: Correct and rewind the cooled roll material. After rewinding, the surface temperature of the roll material is less than 35℃, thus obtaining a polymer-modified bitumen roll material resistant to weathering and cracking.

[0144] The performance of the polymer-modified bitumen rolls prepared in Examples 1-3 and Comparative Examples 1-3 was tested, and the results are shown in Table 1 below.

[0145] Table 1 Performance Test Results

[0146]

[0147] The comparison shows that the improvements made by this invention to the proportioning, preparation, and forming methods of polymer-modified asphalt raw materials can significantly improve the aging resistance and seam peel strength of the roll material, greatly enhance the weathering resistance of the roll material coating, and ensure that the roll material coating does not fall off after weathering, resulting in stable and reliable product performance. As can be seen from Examples 1-3 and Comparative Examples 1-3, using reinforced long-filament polyester fiber base significantly reduces the risk of shrinkage after hot-melt construction of the roll material. Compared with Example 1 and Comparative Example 3, the roll material using the adjusted polymer-modified asphalt raw material formulation shows an improvement of 2-3°C in aging resistance and 0.6 N / mm in peel performance. As can be seen from Comparative Examples 1-2, using the roll material forming process of the present invention, no weathering cracks are generated in the roll material covering material, indicating that the forming process of the present invention has a significant inhibitory effect on cracking after weathering of the roll material. As can be seen from Comparative Examples 1 and 3, under the condition of unchanged formulation, using the polymer-modified asphalt processing technology and roll material forming technology, the aging resistance of the roll material is improved by 3°C, and the weathering time is extended by 36 days, indicating that the polymer-modified asphalt processing technology and roll material forming technology of the present invention can effectively improve the aging resistance and weathering resistance of the roll material.

[0148] Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be covered within the protection scope of the present invention.

Claims

1. A weather-resistant and crack-resistant polymer-modified bitumen roll material, characterized in that, It includes, from top to bottom, an upper surface isolation material layer, an upper surface polymer-modified asphalt layer, an intermediate carcass reinforcement layer, a lower surface polymer-modified asphalt layer, and a lower surface isolation material layer; The polymer-modified asphalt used in the upper and lower surface polymer-modified asphalt layers comprises the following raw materials in parts by weight: 55-70 parts petroleum asphalt, 15-25 parts asphalt modifier, 8-15 parts SBS, 5-8 parts SBR, 3-6 parts SIS, 3-5 parts terpene resin, and 10-20 parts inorganic filler; Asphalt modifiers include naphthenic oil, aromatic oil and Sasobit modifier at mass percentages of 65%~80%, 17%~30% and 3%~5%, respectively. The upper and lower surface isolation material layers are made of corona-treated polyethylene film. The intermediate carcass reinforcement layer uses a reinforced long-filament polyester fiber base; The preparation method of polymer-modified bitumen roll material includes the following steps: (1) Unfold the tire base and dry it at a temperature of 190~200℃; (2) The dried tire base is pre-impregnated with oil for sealing. The softening point of the pre-impregnated oil is 65~85℃, the temperature of the pre-impregnated oil is 185~195℃, and the pre-impregnated oil adopts the "two-impregnation and two-press" process. (3) Cool and vent the tire base after oil immersion to reduce the tire base temperature to 40~60℃; (4) The cooled oil-impregnated tire base coated with polymer-modified asphalt is subjected to a second roll-press sealing treatment at a temperature of 175~185℃. (5) The base material after being sealed again is introduced into the oiling tank, and polymer modified asphalt is coated on the upper and lower surfaces of the base material respectively. The coating temperature is 175~185℃. Then, the base material is shaped and processed to produce a polymer modified asphalt roll semi-finished product of specified thickness. (6) Adjust the production speed to 25~35m / min, flatten the lower surface isolation material and cover it on the lower surface of the semi-finished product. Control the film tension at 0.1~0.3N and adjust the film feeding speed to 25~35m / min. (7) After flattening the upper surface isolation material, cover it onto the upper surface of the semi-finished product to make a polymer modified bitumen roll product. The film tension is controlled at 0.15~0.35N, and the film feeding speed is adjusted to 25~35m / min. (8) Immerse the finished polymer-modified bitumen roll in circulating cooling water at a temperature of 15-25°C. After cooling, the surface temperature of the roll is controlled at 25-35°C. (9) Embossing treatment is applied to the roll material, with an embossing roller pressure of 0.3~0.4 MPa; (10) The embossed roll material is cooled on a storage rack. The cooling of the storage rack is carried out by a combination of air cooling and cooling rollers. The temperature of the cold air is 25~30℃ and the temperature of the cooling rollers is 15~25℃. (11) Rewinding: The surface temperature of the roll is less than 35°C after rewinding.

2. The polymer-modified bitumen roll as described in claim 1, characterized in that, The petroleum asphalt is 70# naphthenic petroleum asphalt with a penetration value of 68~72, and the penetration measurement unit is 0.1mm; the SBS is linear SBS with a molecular weight of 80,000~150,000, a melt flow rate of 0.05~5g / 10min, and a styrene content of 28%~42%; the SBR is granular SBR with an ash content of less than 50%; the SIS is composed of polystyrene segments-polyisoprene segments-polystyrene segments intercalated, with a linear structure and a block ratio of 25 / 75; the inorganic filler is talc.

3. The polymer-modified bitumen roll as described in claim 1, characterized in that, The preparation method of polymer-modified bitumen includes the following steps: S1: Add the melted petroleum asphalt to the mixing tank, add the asphalt modifier at an ambient temperature of 150~160℃, and stir for 30~35 minutes. S2: When the temperature is raised to 160~170℃, add SBS, SBR and SIS in sequence, stir for 30 min, and the stirring speed is 300~400 r / min; S3: Start the single-tank grinding system of the batching tank, set the grinding disc gap to 0.15~0.20, keep the temperature of the batching tank at 170~180℃, and continue stirring for 4~5 hours; S4: When the mixture is fully developed and there are no obvious particles, turn off the single-tank grinding system; S5: Turn on the feed circulation pump to transfer the fully developed mixture to the powder tank, add inorganic filler, maintain the mixing speed of the powder tank at 200~300r / min, keep the mixing temperature at 160~170℃, and mix for 30 minutes to make polymer modified asphalt.

4. The polymer-modified bitumen roll as described in claim 1, characterized in that, The viscosity of polymer-modified bitumen is 20,000~35,000 mPa·s.

5. The polymer-modified bitumen roll as described in claim 1, characterized in that, The reinforcement uses high-strength glass fiber filaments, with a reinforcement density of 6~10 filaments / meter.

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