Environmentally friendly exposed cladding material and environmentally friendly exposed modified asphalt waterproofing membrane and preparation method thereof

Abstract

The present invention provides an environmentally friendly exposed cladding material and an environmentally friendly exposed modified asphalt waterproofing membrane, as well as a preparation method. The environmentally friendly exposed cladding material is derived from recycled asphalt stone produced during asphalt roadbed maintenance and is manufactured through a series of processes, including primary crushing, screening, secondary crushing, screening, grading, and mixing. The environmentally friendly exposed modified asphalt waterproofing membrane produced from the environmentally friendly exposed cladding material exhibits more reliable adhesion between the mineral aggregate and the modified asphalt, excellent puncture resistance, and effective resistance to UV aging and water erosion and peeling. It is a new type of exposed waterproofing membrane that can replace existing mineral aggregate surface membranes.

Description

Technical Field

[0001] The present invention relates to the field of modified asphalt waterproofing coiled materials, and in particular to an environmentally friendly exposed covering material and an environmentally friendly exposed modified asphalt waterproofing coiled material and a preparation method thereof. Background Art

[0002] Modified asphalt waterproofing membrane is the most popular waterproofing product. It is divided into PE (polyethylene film), S (fine sand), and M (mineral aggregate) according to the upper surface material. Among them, the only exposed membrane is the membrane that uses M (mineral aggregate) as the upper surface isolation material.

[0003] The existing M (mineral aggregate) is mainly made from crushed rocks from mountains. Due to the restrictions of national environmental protection policies and rising transportation costs, the price of mineral aggregate materials has been rising year by year.

[0004] Mineral aggregate surface modified asphalt rolls are made by spreading mineral aggregates on the surface of modified asphalt at high temperature and bonding them to the surface of the roll through embedded bonding. The bonding strength of the mineral aggregates is proportional to the bonding area, but the bonding area is unstable and uncontrollable due to the unstable stacking structure of the roll surface. Secondly, the mineral aggregates themselves generate a large amount of dust during the production and crushing process, and the dust residue on the surface of the particles also has an adverse effect on the bonding of the modified asphalt.

[0005] It can be seen from this that the mineral aggregate surface modified asphalt waterproofing membrane has problems such as poor adhesion of the surface mineral aggregates and sand falling off, serious sand falling and asphalt bare spots, and the mineral aggregates are hydrophilic and prone to water erosion, resulting in natural aging and peeling, affecting the service life.

[0006] CN113430881A discloses a method for laying a regenerated roadbed based on the full utilization of solid waste: a method for laying a regenerated roadbed based on the full utilization of solid waste, comprising the following steps: (a) prefabricating an asphalt layer of solid waste recycled materials and a crushed stone mixture; (b) mixing the asphalt layer solid waste recycled materials, the crushed stone mixture, and lime to form a regenerated roadbed marl-lime stone layer; (c) laying an anti-seepage layer and a fixed frame, mixing the asphalt layer solid waste recycled materials, the crushed stone mixture, plastic strips, and nylon ropes, and injecting them into the fixed frame to form a regenerated roadbed graded drainage layer; (d) mixing the crushed stone mixture with natural crushed stone, cement, and water to form a regenerated roadbed cement-stabilized crushed stone layer; and (e) mixing the asphalt layer solid waste recycled materials with natural crushed stone to form a regenerated roadbed asphalt layer. However, this method has the disadvantage that it is only applicable to one type of mixed material used for underground roadbed paving, is not exposed to the public, and has limited utilization value.

[0007] CN112609476A discloses a method for producing waterproofing membranes by modifying asphalt-based waste waterproofing membranes. The recycled membranes do not need to be crushed for reuse; instead, they are directly placed in a heating reactor for melting. Pure asphalt and various additives are then added in certain proportions to produce new waterproofing membranes. However, this method is only suitable for melting PE-masked polyester-based asphalt-based waterproofing membranes. For surfaces with fine sand or mineral granules, inorganic mineral particles must be removed or filtered out, resulting in high processing costs and making it unsuitable for recycling stone materials.

[0008] In response to the above technical difficulties, it is an urgent problem to develop an exposed covering material that can replace the existing mineral aggregate and improve the adhesion with modified asphalt, and the modified asphalt waterproof membrane produced thereby has excellent puncture resistance, aging resistance, water erosion and peeling resistance and other properties. Summary of the Invention

[0009] In response to the shortcomings of the existing technology, the present invention provides an environmentally friendly exposed cladding material and an environmentally friendly exposed modified asphalt waterproofing membrane. The environmentally friendly exposed cladding material is taken from recycled asphalt stone generated by asphalt roadbed maintenance and is self-made through the processes of primary crushing, screening, secondary crushing, screening, grading, and mixing. The environmentally friendly exposed modified asphalt waterproofing membrane made from the environmentally friendly exposed cladding material has more reliable adhesion between mineral granules and modified asphalt, excellent puncture resistance, and can effectively resist ultraviolet aging and water erosion and peeling. It is a new type of exposed waterproofing material that can replace existing mineral granular surface membranes.

[0010] The technical solutions of the present invention are as follows:

[0011] The present invention provides an environmentally friendly exposed cladding material, which is made from recycled asphalt stone produced by asphalt roadbed maintenance. The recycled asphalt stone comprises the following components: one or more of asphalt material, coarse aggregate, fine aggregate, and filler.

[0012] Furthermore, the asphalt material includes one or more of petroleum asphalt, emulsified petroleum asphalt or modified asphalt.

[0013] Furthermore, the coarse aggregate includes one or more of gravel, crushed gravel, screened gravel, steel slag, slag, etc.

[0014] Furthermore, the fine aggregate includes one or more of natural sand, artificial sand, stone chips, etc. with a particle size less than 2.36 mm.

[0015] Furthermore, the filler includes mineral powder obtained by grinding strong basic rocks such as limestone or basalt, or cement, lime or fly ash.

[0016] Furthermore, the recycled asphalt stone preferably comprises asphalt material being modified asphalt, coarse aggregate being gravel, crushed gravel or screened gravel, and filler being basalt. The present invention does not exclude other types of asphalt stone recycling technology solutions.

[0017] The present invention also provides a method for preparing the aforementioned environmentally friendly exposed cladding material, the method comprising the following steps:

[0018] Step S1: Primary Crushing

[0019] The recycled asphalt stone is crushed in the first stage using an impact crusher, and the discharge size is set to 10 mm. The crushed recycled asphalt stone is then sieved, and the fine material below 10 mesh is collected for standby use, which is calculated as S0;

[0020] Step S2: Secondary crushing

[0021] The coarse materials above 10 mesh sieved above are sent to the impact crusher for secondary crushing, and the discharge size is set to 2.0 mm. The crushed coarse materials are then sieved and distributed into 10 mesh sieve S1, 10-20 mesh sieve S2, 20-30 mesh sieve S3, 30-40 mesh sieve S4, 40-60 mesh sieve S5, and 60 mesh sieve S6;

[0022] Step S3: Grading

[0023] The sieves S0, S1, S2, S3, S4 and S5 are graded and the proportions by weight are as follows:

[0024]

[0025] Step S4: Stirring and dust removal

[0026] The graded mixture is fed into a spiral mixing device and stirred for 15-20 minutes. During the stirring process, a -0.1 MPa negative pressure dust removal treatment is simultaneously performed. After stirring, the environmentally friendly exposed covering material is prepared.

[0027] Furthermore, the model of the impact crusher is PF-1315.

[0028] Furthermore, the impact crusher is a new sand making machine of the VSI5X series.

[0029] The present invention also provides an environmentally friendly exposed modified asphalt waterproof membrane, which includes, from top to bottom, an upper surface environmentally friendly exposed covering material, an upper surface modified asphalt, a base, a lower surface modified asphalt, and a lower surface isolation membrane.

[0030] Furthermore, the upper surface environmentally friendly exposed covering material is the environmentally friendly exposed covering material prepared above, and the mesh size range is the same as the above-mentioned grading of screening S0, S1, S2, S3, S4, and S5 to obtain the proportion weight range.

[0031] Furthermore, a 10cm overlap is reserved at the edge of the environmentally friendly exposed upper surface covering material. Depending on the construction method, this overlap can be made of either PE film or a silicone-coated release film. The PE film is bonded to the environmentally friendly exposed upper surface covering material using hot melt bonding. The silicone-coated release film is bonded to the environmentally friendly exposed upper surface covering material using either cold or hot bonding.

[0032] Furthermore, the upper surface modified asphalt and the lower surface modified asphalt can be the same or different polymer modified asphalt materials.

[0033] Furthermore, the material of the upper surface modified asphalt and the lower surface modified asphalt is the same polymer modified asphalt. The polymer modified asphalt, in parts by weight, comprises the following components:

[0034]

[0035] Furthermore, the base material is one or more of polyester, fiberglass, or fiberglass-reinforced polyester. The base material is preferably polyester, with a grammage of 170-300 g / m2. The specific grammage of the base material can be selected based on the tensile strength requirements of the environmentally friendly exposed modified asphalt waterproof membrane.

[0036] Furthermore, the polymer-modified asphalt is prepared by conventional methods, which are not particularly limited in the present invention. For example, the petroleum asphalt is heated to 150-160°C, and then the SBS modifier is added to swell for 10-15 minutes. The temperature is then raised to 185-195°C and homogenized for 1.5-2 hours. Then, the additives such as tackifying resin and cross-linking agent are added and stirred for 20-30 minutes. Finally, the inorganic filler is added and stirred for 50-60 minutes to produce the polymer-modified asphalt coating.

[0037] Furthermore, the lower surface isolation film may be one or more of a polyethylene film, a silicon-coated isolation film, or fine sand.

[0038] The present invention also provides a method for preparing the aforementioned environmentally friendly exposed modified asphalt waterproof membrane, the preparation method being as follows:

[0039] 1) The tire base is unfolded, and sequentially undergoes drying, pre-soaking, and squeezing processes, and then enters an oiling tank, where modified asphalt is coated on the upper and lower surfaces of the tire base respectively;

[0040] 2) placing the modified asphalt coiled material coated in step 1) into a cooling water bed to begin cooling, and then spreading an environmentally friendly exposed covering material after exiting the water bed;

[0041] 3) Covering the lower surface of the lower surface modified asphalt with a lower surface isolation film by adsorption drying or hot air drying;

[0042] 4) The coiled material obtained in step 3) is then cooled and shaped by rollers, and then conveyed to a baler for winding, cutting, and packaging to produce an environmentally friendly exposed modified asphalt waterproofing coiled material.

[0043] Furthermore, in step 1), the drying equipment is heated by heat transfer oil or resistance heating air conduction, the heating temperature is 160-180°C, and the heating surface tire base stroke is 3.5-4.5m.

[0044] Furthermore, in step 1), during the pre-impregnation process of the tire base, the pre-impregnation temperature is 180-200° C., and the pre-impregnation viscosity at 160° C. is 6-20 dPa·S.

[0045] Furthermore, in step 1), during the oiling process of the tire base, the temperature of the modified asphalt applied to the upper and lower surfaces is 175-195° C. The thickness of the modified asphalt on the upper surface is 0.8-1.8 mm, and the thickness of the modified asphalt on the lower surface is 1.0-2.0 mm. The specific thickness is adjusted according to the product specifications as needed.

[0046] Furthermore, in step 2), the water bed is cooled by circulating water, and the cooling temperature is controlled at 20-55°C.

[0047] Furthermore, in step 2), the spreading process of the environmentally friendly exposed covering material includes the following steps:

[0048] 1a) Add the environmentally friendly exposed cladding material into the heating hopper and heat it to 80-100°C for preheating for 15-20 minutes;

[0049] 2a) spraying surfactant while stirring, the spraying speed is controlled at 0.8-1.0 kg / min, and stirring is performed for 5-10 minutes after spraying. The amount of surfactant used is 8-15 kg per ton of environmentally friendly exposed cladding material;

[0050] 3a) Discharge the environmentally friendly exposed cladding material after spraying into the lower hopper, and immediately spread it to the surface of the modified asphalt coiled material leaving the oil pool using a two-way swing arm. The surface temperature of the modified asphalt in the spreading section should be 160-170°C.

[0051] 4a) Compacting and drying the coiled material to obtain the environmentally friendly exposed covering material.

[0052] Furthermore, the main function is to promote the surface wetting of the crushed stone in the environmentally friendly exposed covering material. The sprayed surfactant is a composite solvent of tackifying resin and xylene with a mass ratio of 1: (1-1.5), and increase the surface adhesion of the asphalt material in the mixture, thereby improving the bonding force between the exposed covering materials and the bonding force with the modified asphalt on the surface of the coil.

[0053] Furthermore, the tackifying resin may be one or more of rosin resin, coumarone resin or C5 petroleum resin.

[0054] The beneficial effects of the present invention are as follows:

[0055] 1) The environmentally friendly exposed cladding material of this invention is primarily made from recycled asphalt aggregate from asphalt roadbed repairs. It is manufactured in-house through a series of processes, including primary crushing, screening, secondary crushing, screening, grading, and mixing. Combining this environmentally friendly exposed cladding material with modified asphalt membranes creates excellent composite bonding strength and surface hydrophobicity, reducing the aging effects of rainwater erosion on the modified asphalt membranes.

[0056] 2) The environmentally friendly exposed modified asphalt waterproofing membrane made from the environmentally friendly exposed cladding material exhibits more reliable adhesion between the mineral aggregate and the modified asphalt, excellent puncture resistance, and effective resistance to UV aging and water erosion and peeling. Referring to GB18242-2008 Elastomer-modified asphalt waterproofing membrane: The mineral aggregate adhesion index of ordinary mineral aggregate surface membranes is ≤2g; testing of the environmentally friendly exposed modified asphalt waterproofing membrane in the present invention has shown that the mineral aggregate adhesion index is 0.6-0.8g, far lower than the measured adhesion value of 1.5-1.9g for ordinary mineral aggregate surface membranes. The environmentally friendly exposed modified asphalt waterproofing membrane has a puncture resistance strength of no less than 780N. Referring to GB18242-2008 elastomer modified asphalt waterproofing membrane: the mass increase index of ordinary mineral granular surface membrane after immersion in water is ≤2.0g, and the measured level is 1.6-2.0g; through testing of the present invention, the mass increase of the environmentally friendly exposed modified asphalt waterproofing membrane after immersion in water is no more than 1.3g, which is lower than the measured level of ordinary mineral granular surface membrane.

[0057] 3) The environmentally friendly exposed modified asphalt waterproofing membrane provided by the present invention has excellent environmental protection properties and can be used to recycle a large amount of asphalt pavement maintenance waste, thereby reducing mining resources and protecting the environment.

[0058] 4) In the preparation process of the environmentally friendly exposed modified asphalt waterproof membrane of the present invention, the composite process of the environmentally friendly exposed covering material and the modified asphalt on the upper surface adopts an innovative spreading process that is different from the traditional spreading process technology, which can improve the mineral particle adhesion, puncture resistance and quality increase of the membrane after immersion in water. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 The figure is a flow chart of the preparation process of the environmentally friendly exposed cladding material of the present invention.

[0060] Figure 2 This is a schematic structural diagram of the environmentally friendly exposed modified asphalt waterproof membrane of the present invention.

[0061] Figure 3 Schematic diagram of the spreading process flow of the present invention. DETAILED DESCRIPTION

[0062] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Instead, these embodiments are provided to make the present invention more thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0063] Example 1

[0064] (1) Preparation of environmentally friendly exposed covering materials

[0065] Recycled asphalt aggregate is the purchase of old asphalt aggregate generated during highway pavement maintenance;

[0066] Step S1: Primary Crushing

[0067] The recycled asphalt stone is crushed using an impact crusher, model PF-1315, with the discharge size set to 10 mm. The fine material below 10 mesh is sieved and collected for later use, which is calculated as S0:

[0068] Step S2: Secondary crushing

[0069] The coarse materials above 10 mesh screened out above are fed into the impact crusher (VSI5X series new sand making machine), the discharge size is set to 2.0 mm, and secondary crushing and screening are carried out, and the materials are distributed and collected as follows: 10 mesh screen S1, 10-20 mesh screen S2, 20-30 mesh screen S3, 30-40 mesh screen S4, 40-60 mesh S5, and below 60 mesh S6;

[0070] Step S3: Grading

[0071] The sieves S0, S1, S2, S3, S4 and S5 are graded in the following proportions:

[0072] Quantity (by weight)

[0073]

[0074] Step S4: Stirring and dust removal

[0075] The graded mixture is fed into a spiral mixing device and stirred for 15-20 minutes. During the stirring process, a -0.1Mpa negative pressure dust removal treatment is simultaneously performed. After stirring, the environmentally friendly exposed covering material is prepared.

[0076] (2) An environmentally friendly exposed modified asphalt waterproofing membrane, comprising, from top to bottom, an upper surface environmentally friendly exposed covering material, an upper surface modified asphalt, a base, a lower surface modified asphalt, and a lower surface isolation membrane. The preparation of the upper surface modified asphalt and the lower surface modified asphalt is conventional and will not be described in detail. The components and proportions thereof, in parts by weight, are as follows:

[0077]

[0078] Other additives are conventional materials, including petroleum tackifying resin, terpene resin, coumarone resin, etc. In the embodiment, C5 petroleum resin is preferred, and the same applies below.

[0079] The inorganic filler is also a conventional material, including talc powder, light calcium powder, fly ash, etc. In this embodiment, 200 mesh talc powder is preferred, and the same applies below.

[0080] (3) A method for preparing an environmentally friendly exposed modified asphalt waterproof membrane, comprising the following steps:

[0081] 1) The intermediate tire base is unfolded and goes through the drying, pre-soaking and squeezing processes in sequence before entering the oiling tank where the upper and lower surfaces are coated with modified asphalt;

[0082] The drying equipment adopts resistance heating and air conduction heating, with a heating temperature of 180°C and a heating surface tire base travel of 3.5m;

[0083] During the pre-impregnation process of the tire base, the pre-impregnation temperature is 185°C and the pre-impregnation viscosity (160°C) is 8dPa·S;

[0084] During the oiling process, the temperature of the modified asphalt coating on the upper and lower surfaces is 180°C, the thickness of the modified asphalt coating on the upper surface is 0.8mm, the thickness of the modified asphalt coating on the lower surface is 1.1mm, and the product thickness is 3.0mm.

[0085] 2) The coated modified asphalt coil enters the cooling water bed and begins to cool. The water bed uses circulating water for cooling and the cooling temperature is controlled at 35°C. The surface covering material is spread on the water bed;

[0086] The spreading process includes:

[0087] 1a) Add the new exposed cladding material to a heating hopper and heat it to 85°C for 15 minutes;

[0088] 2a) Spraying surfactant, stirring and spraying at a rate of 0.8 kg / min, stirring for 6 minutes after spraying, and a dosage of 8 kg per ton; the surfactant to be sprayed is a composite solvent of tackifying resin and xylene, with a ratio of 1:1.5;

[0089] 3a) Discharge the material into the lower hopper and immediately spread it to the surface of the modified asphalt coiled material exiting the oiling pool using a two-way swing arm. The surface temperature of the modified asphalt in the spreading section is controlled at 165°C.

[0090] 4a) Further, the coiled material is compacted and dried;

[0091] 3) The lower surface is dried by adsorption or hot air drying and then covered with insulating material;

[0092] 4) The product is then cooled and shaped by rollers, and then sent to a baler for winding, cutting, and packaging to produce an environmentally friendly exposed modified asphalt waterproof membrane.

[0093] Example 2

[0094] (1) Preparation of environmentally friendly exposed covering materials

[0095] Recycling asphalt stone is to recycle old asphalt stone produced by the maintenance of heavy traffic urban first-class asphalt road pavement;

[0096] Step S1: Primary Crushing

[0097] The recycled asphalt stone is crushed using an impact crusher, model PF-1315, with the discharge size set to 10 mm. The fine material below 10 mesh is sieved and collected for later use, which is calculated as S0:

[0098] Step S2: Secondary crushing

[0099] The coarse materials above 10 mesh screened out above are fed into the impact crusher (VSI5X series new sand making machine), the discharge size is set to 2.0 mm, and secondary crushing and screening are carried out, and the materials are distributed and collected as follows: 10 mesh screen S1, 10-20 mesh screen S2, 20-30 mesh screen S3, 30-40 mesh screen S4, 40-60 mesh S5, and below 60 mesh S6;

[0100] Step S3: Grading

[0101] The sieves S0, S1, S2, S3, S4 and S5 are graded in the following proportions:

[0102] Quantity (by weight)

[0103]

[0104] Step S4: Stirring and dust removal

[0105] The graded mixture is fed into a spiral mixing device and stirred for 15-20 minutes. During the stirring process, a -0.1Mpa negative pressure dust removal treatment is simultaneously performed. After stirring, the new exposed covering material is prepared.

[0106] (2) An environmentally friendly exposed modified asphalt waterproofing membrane, comprising, from top to bottom, an upper surface environmentally friendly exposed covering material, an upper surface modified asphalt, a base, a lower surface modified asphalt, and a lower surface isolation membrane. The preparation of the upper surface modified asphalt and the lower surface modified asphalt is conventional and will not be described in detail. The components and proportions thereof, in parts by weight, are as follows:

[0107]

[0108] (3) A method for preparing an environmentally friendly exposed modified asphalt waterproof membrane, comprising the following steps:

[0109] 1) The intermediate tire base is unfolded and goes through the drying, pre-soaking and squeezing processes in sequence before entering the oiling tank where the upper and lower surfaces are coated with modified asphalt;

[0110] The drying equipment adopts resistance heating and air conduction heating, with a heating temperature of 180°C and a heating surface tire base travel of 3.5m;

[0111] During the pre-impregnation process of the tire base, the pre-impregnation temperature is 185°C and the pre-impregnation viscosity (160°C) is 8dPa·S;

[0112] During the oiling process, the temperature of the modified asphalt coating on the upper and lower surfaces is 180°C, the thickness of the modified asphalt coating on the upper surface is 0.8mm, the thickness of the modified asphalt coating on the lower surface is 1.1mm, and the product thickness is 3.0mm.

[0113] 2) The coated modified asphalt coil enters the cooling water bed and begins to cool. The water bed uses circulating water for cooling and the cooling temperature is controlled at 35°C. The surface covering material is spread on the water bed;

[0114] The spreading process includes:

[0115] 1a) Add the new exposed cladding material into a heating hopper and heat it to 85°C for 15 minutes;

[0116] 2a) Spraying surfactant, stirring and spraying at a rate of 0.8 kg / min, stirring for 6 minutes after spraying, and a dosage of 8 kg per ton; the surfactant to be sprayed is a composite solvent of tackifying resin and xylene, with a ratio of 1:1.5;

[0117] 3a) Discharge the material into the lower hopper and immediately spread it to the surface of the modified asphalt coiled material exiting the oiling pool using a two-way swing arm. The surface temperature of the modified asphalt in the spreading section is controlled at 165°C.

[0118] 4a) Further, the coiled material is compacted and dried;

[0119] 3) The lower surface is dried by adsorption or hot air drying and then covered with insulating material;

[0120] 4) The product is then cooled and shaped by rollers, and then sent to a baler for winding, cutting, and packaging to produce an environmentally friendly exposed modified asphalt waterproof membrane.

[0121] Example 3

[0122] (1) Preparation of an environmentally friendly exposed covering material

[0123] Recycling asphalt stone is to recycle old asphalt stone produced by the maintenance of light traffic urban secondary asphalt road pavement;

[0124] Step S1: Primary Crushing

[0125] The recycled asphalt stone is crushed using an impact crusher, model PF-1315, with the discharge size set to 10 mm. The fine material below 10 mesh is sieved and collected for later use, which is calculated as S0:

[0126] Step S2: Secondary crushing

[0127] The coarse materials above 10 mesh screened out above are fed into the impact crusher (VSI5X series new sand making machine), the discharge size is set to 2.0 mm, and secondary crushing and screening are carried out, and the materials are distributed and collected as follows: 10 mesh screen S1, 10-20 mesh screen S2, 20-30 mesh screen S3, 30-40 mesh screen S4, 40-60 mesh S5, and below 60 mesh S6;

[0128] Step S3: Grading

[0129] The sieves S0, S1, S2, S3, S4 and S5 are graded in the following proportions:

[0130] Quantity (by weight)

[0131]

[0132] Step S4: Stirring and dust removal

[0133] The graded mixture is fed into a spiral mixing device and stirred for 15-20 minutes. During the stirring process, a -0.1Mpa negative pressure dust removal treatment is simultaneously performed. After stirring, the new exposed covering material is prepared.

[0134] (2) An environmentally friendly exposed modified asphalt waterproofing membrane, comprising, from top to bottom, an upper surface environmentally friendly exposed covering material, an upper surface modified asphalt, a base, a lower surface modified asphalt, and a lower surface isolation membrane. The preparation of the upper surface modified asphalt and the lower surface modified asphalt is conventional and will not be described in detail. The components and proportions thereof, in parts by weight, are as follows:

[0135]

[0136]

[0137] (3) A method for preparing an environmentally friendly exposed modified asphalt waterproof membrane, comprising the following steps:

[0138] 1) The intermediate tire base is unfolded and goes through the drying, pre-soaking and squeezing processes in sequence before entering the oiling tank where the upper and lower surfaces are coated with modified asphalt;

[0139] The drying equipment adopts resistance heating and air conduction heating, with a heating temperature of 180°C and a heating surface tire base travel of 3.5m;

[0140] During the pre-impregnation process of the tire base, the pre-impregnation temperature is 185°C and the pre-impregnation viscosity (160°C) is 8dPa·S;

[0141] During the oiling process, the temperature of the modified asphalt coating on the upper and lower surfaces is 180°C, the thickness of the modified asphalt coating on the upper surface is 0.8mm, the thickness of the modified asphalt coating on the lower surface is 1.1mm, and the product thickness is 3.0mm.

[0142] 2) The coated modified asphalt coil enters the cooling water bed and begins to cool. The water bed uses circulating water for cooling and the cooling temperature is controlled at 35°C. The surface covering material is spread on the water bed;

[0143] The spreading process includes:

[0144] 1a) Add the new exposed cladding material into a heating hopper and heat it to 85°C for 15 minutes;

[0145] 2a) Spraying surfactant, stirring and spraying at a rate of 0.8 kg / min, stirring for 6 minutes after spraying, and a dosage of 8 kg per ton; the surfactant to be sprayed is a composite solvent of tackifying resin and xylene, with a ratio of 1:1.5;

[0146] 3a) Discharge the material into the lower hopper and immediately spread it to the surface of the modified asphalt coiled material exiting the oiling pool using a two-way swing arm. The surface temperature of the modified asphalt in the spreading section is controlled at 165°C.

[0147] 4a) Further, the coiled material is compacted and dried;

[0148] 3) The lower surface is dried by adsorption or hot air drying and then covered with insulating material;

[0149] 4) The product is then cooled and shaped by rollers, and then sent to a baler for winding, cutting, and packaging to produce an environmentally friendly exposed modified asphalt waterproof membrane.

[0150] Example 4

[0151] (1) Preparation of an environmentally friendly exposed covering material

[0152] Asphalt stone recycling is the purchase of old asphalt stone produced by highway pavement maintenance;

[0153] Step S1: Primary Crushing

[0154] The recycled asphalt stone is crushed using an impact crusher, model PF-1315, with the discharge size set to 10 mm. The fine material below 10 mesh is sieved and collected for later use, which is calculated as S0:

[0155] Step S2: Secondary crushing

[0156] The coarse materials above 10 mesh screened out above are fed into the impact crusher (VSI5X series new sand making machine), the discharge size is set to 2.0 mm, and secondary crushing and screening are carried out, and the materials are distributed and collected as follows: 10 mesh screen S1, 10-20 mesh screen S2, 20-30 mesh screen S3, 30-40 mesh screen S4, 40-60 mesh S5, and below 60 mesh S6;

[0157] Step S3: Grading

[0158] The sieves S0, S1, S2, S3, S4 and S5 are graded in the following proportions:

[0159] Quantity (by weight)

[0160]

[0161] Step S4: Stirring and dust removal

[0162] The graded mixture is fed into a spiral mixing device and stirred for 15-20 minutes. During the stirring process, a -0.1Mpa negative pressure dust removal treatment is simultaneously performed. After stirring, the new exposed covering material is prepared.

[0163] (2) An environmentally friendly exposed modified asphalt waterproofing membrane, comprising, from top to bottom, an upper surface environmentally friendly exposed covering material, an upper surface modified asphalt, a base, a lower surface modified asphalt, and a lower surface isolation membrane. The preparation of the upper surface modified asphalt and the lower surface modified asphalt is conventional and will not be described in detail. The components and proportions thereof, in parts by weight, are as follows:

[0164]

[0165] (3) A method for preparing an environmentally friendly exposed modified asphalt waterproof membrane, comprising the following steps:

[0166] 1) The intermediate tire base is unfolded and goes through the drying, pre-soaking and squeezing processes in sequence before entering the oiling tank where the upper and lower surfaces are coated with modified asphalt;

[0167] The drying equipment adopts resistance heating and air conduction heating, with a heating temperature of 180°C and a heating surface tire base travel of 3.5m;

[0168] During the pre-impregnation process of the tire base, the pre-impregnation temperature is 185°C and the pre-impregnation viscosity (160°C) is 8dPa·S;

[0169] During the oiling process, the temperature of the modified asphalt coating on the upper and lower surfaces is 180°C, the thickness of the modified asphalt coating on the upper surface is 0.8mm, the thickness of the modified asphalt coating on the lower surface is 1.1mm, and the product thickness is 3.0mm.

[0170] 2) The coated modified asphalt coil enters the cooling water bed and begins to cool. The water bed uses circulating water for cooling and the cooling temperature is controlled at 35°C. The surface covering material is spread on the water bed;

[0171] The spreading process is a traditional spreading process: sanding, spreading, compacting, and cooling.

[0172] 3) The lower surface is dried by adsorption or hot air drying and then covered with insulating material;

[0173] 4) The product is then cooled and shaped by rollers, and then sent to a baler for winding, cutting, and packaging to produce an environmentally friendly exposed modified asphalt waterproof membrane.

[0174] Comparative Example 1

[0175] (1) Preparation of ordinary exposed covering materials

[0176] Purchase natural basalt crushed particles produced by Jiangsu Owens as the covering mineral granules for the exposed materials, and the mesh size and sieve residue ratio are:

[0177]

[0178] The mesh size distribution is basically the same as that of Examples 1 to 3 and can be used directly as the covering raw material.

[0179] (2) Ordinary mineral granular modified asphalt waterproof membrane

[0180] From top to bottom, it includes the upper surface common exposed cladding material, upper surface modified asphalt, base, lower surface modified asphalt, and lower surface isolation membrane. The preparation of the upper surface modified asphalt and the lower surface modified asphalt is conventional and will not be elaborated in detail. In terms of weight parts, the ingredients and proportions are as follows:

[0181]

[0182] (3) A method for preparing a common mineral granular modified asphalt waterproofing membrane comprises the following steps:

[0183] 1) The intermediate tire base is unfolded and goes through the drying, pre-soaking and squeezing processes in sequence before entering the oiling tank where the upper and lower surfaces are coated with modified asphalt;

[0184] The drying equipment adopts resistance heating and air conduction heating, with a heating temperature of 180°C and a heating surface tire base travel of 3.5m;

[0185] During the pre-impregnation process of the tire base, the pre-impregnation temperature is 185°C and the pre-impregnation viscosity (160°C) is 8dPa·S;

[0186] During the oiling process, the temperature of the modified asphalt coating on the upper and lower surfaces is 180°C, the thickness of the modified asphalt coating on the upper surface is 0.8mm, the thickness of the modified asphalt coating on the lower surface is 1.1mm, and the product thickness is 3.0mm.

[0187] 2) The coated modified asphalt coil enters the cooling water bed and begins to cool. The water bed uses circulating water for cooling and the cooling temperature is controlled at 35°C. The surface covering material is spread on the water bed;

[0188] The spreading process includes:

[0189] 1a) Add the common exposed cladding material into the heating hopper and heat it to 85°C for 15 minutes;

[0190] 2a) Spraying surfactant, stirring and spraying at a rate of 0.8 kg / min, stirring for 6 minutes after spraying, and a dosage of 8 kg per ton; the surfactant to be sprayed is a composite solvent of tackifying resin and xylene, with a ratio of 1:1.5;

[0191] 3a) Discharge the material into the lower hopper and immediately spread it to the surface of the modified asphalt coiled material exiting the oiling pool using a two-way swing arm. The surface temperature of the modified asphalt in the spreading section is controlled at 165°C.

[0192] 4a) Further, the coiled material is compacted and dried;

[0193] 3) The lower surface is dried by adsorption or hot air drying and then covered with insulating material;

[0194] 4) Then it is cooled and shaped by rollers, and then sent to a baler for winding, cutting and packaging to produce a common mineral granular modified asphalt waterproof membrane.

[0195] Comparative Example 2

[0196] (1) Preparation of ordinary exposed covering materials

[0197] Same as comparative example 1

[0198] (2) Ordinary mineral granular modified asphalt waterproof membrane

[0199] From top to bottom, it includes the upper surface common exposed cladding material, upper surface modified asphalt, base, lower surface modified asphalt, and lower surface isolation membrane. The preparation of the upper surface modified asphalt and the lower surface modified asphalt is conventional and will not be elaborated in detail. In terms of weight parts, the ingredients and proportions are as follows:

[0200]

[0201] (3) A method for preparing a common mineral granular modified asphalt waterproofing membrane comprises the following steps:

[0202] 1) The intermediate tire base is unfolded and goes through the drying, pre-soaking and squeezing processes in sequence before entering the oiling tank where the upper and lower surfaces are coated with modified asphalt;

[0203] The drying equipment adopts resistance heating and air conduction heating, with a heating temperature of 180°C and a heating surface tire base travel of 3.5m;

[0204] During the pre-impregnation process of the tire base, the pre-impregnation temperature is 185°C and the pre-impregnation viscosity (160°C) is 8dPa·S;

[0205] During the oiling process, the temperature of the modified asphalt coating on the upper and lower surfaces is 180°C, the thickness of the modified asphalt coating on the upper surface is 0.8mm, the thickness of the modified asphalt coating on the lower surface is 1.1mm, and the product thickness is 3.0mm.

[0206] 2) The coated modified asphalt coil enters the cooling water bed and begins to cool. The water bed uses circulating water for cooling and the cooling temperature is controlled at 35°C. The surface covering material is spread on the water bed;

[0207] The spreading process is a traditional spreading process: sanding, spreading, compacting, and cooling.

[0208] 3) The lower surface is dried by adsorption or hot air drying and then covered with insulating material;

[0209] 4) Then it is cooled and shaped by rollers, and then sent to a baler for winding, cutting and packaging to produce a common mineral granular modified asphalt waterproof membrane.

[0210] The modified asphalt waterproof membranes of Examples 1, 2, 3, 4 and Comparative Examples 1 and 2 were subjected to physical property tests: the adhesion of the mineral aggregates was evaluated with reference to GB / T328.17, and the puncture resistance was evaluated according to Appendix B of CJ / T234-2006; the mass increase after immersion in water was evaluated according to the test method 6.12 in GB18242-2008.

[0211] Table 1 Test results of physical properties of modified asphalt waterproof membranes of Examples 1 to 4 and Comparative Example

[0212]

[0213] Comparing with Table 1, it can be seen that, in a horizontal comparison of the three recycled asphalt stones in Examples 1, 2, and 3, the higher the elasticity of the asphalt pavement, the higher the proportion of the modifier (the modifier is a macroscopic comparison of the proportion of the modifier contained in the recycled asphalt stone), the lower the mineral granular adhesion and the mass increase after immersion in water, and the higher the puncture resistance. Compared with Example 4, the innovation of the spreading process also has a certain degree of impact on the three major indicators. Compared with the ordinary mineral granular surface modified asphalt waterproofing membrane in Comparative Example 1, the environmentally friendly exposed covering material of the present invention can improve the mineral granular adhesion, puncture resistance, and mass increase after immersion in water of the membrane; at the same time, comparing the data of Comparative Examples 1 and 2, the spreading process of the upper surface covering material (surface activation treatment) mainly affects the recycled material, and has basically no effect on the ordinary shale data. The main reason is that there is some modified asphalt on the surface of the recycled material.

[0214] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent variation based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. An environmentally friendly exposed modified asphalt waterproof membrane, characterized in that: The environmentally friendly exposed modified asphalt waterproof membrane comprises, from top to bottom, an upper surface environmentally friendly exposed covering material, an upper surface modified asphalt, a base, a lower surface modified asphalt, and a lower surface isolation membrane, wherein the environmentally friendly exposed covering material is made from recycled asphalt stone produced by asphalt roadbed maintenance, and the recycled asphalt stone comprises the following components: one or more of asphalt material, coarse aggregate, fine aggregate, and filler; The preparation method of the environmentally friendly exposed cladding material comprises the following steps: Step 1: Primary Crushing The recycled asphalt stone is crushed in the first stage using an impact crusher, and the discharge size is set to 10 mm. The crushed recycled asphalt stone is then sieved, and the fine material below 10 mesh is collected for standby use, which is calculated as S0; Step 2: Secondary Crushing The coarse materials above 10 mesh sieved above are sent to the impact crusher for secondary crushing, and the discharge size is set to 2.0 mm. The crushed coarse materials are then sieved and distributed into 10 mesh sieve S1, 10-20 mesh sieve S2, 20-30 mesh sieve S3, 30-40 mesh sieve S4, 40-60 mesh sieve S5, and 60 mesh sieve S6; Step 3: Grading The sieves S0, S1, S2, S3, S4 and S5 are graded and the proportions by weight are as follows: S0： 6-14； S1： 15-25； S2： 35-45； S3： 10-20； S4： 8-12； S5： 4-6； Step 4: Stir and Dust The graded mixture is put into a spiral mixing device and stirred for 15-20 minutes. During the stirring process, a -0.1Mpa negative pressure dust removal treatment is simultaneously performed. After stirring, the environmentally friendly exposed cladding material is prepared; The spreading process of the environmentally friendly exposed cladding material comprises the following steps: 1a) Add the environmentally friendly exposed cladding material into the heating hopper and heat it to 80-100℃ for preheating for 15-20 minutes; 2a) spraying a surfactant while stirring, with the spraying speed controlled at 0.8-1.0 kg / min, stirring for 5-10 minutes after spraying, and the amount of surfactant used is 8-15 kg per ton of environmentally friendly exposed cladding material; the spraying surfactant is a composite solvent of tackifying resin and xylene, with a mass ratio of 1:(1-1.5); 3a) Discharge the environmentally friendly exposed cladding material after spraying into the lower hopper, and immediately spread it to the modified asphalt surface on the upper surface of the cooling water bed using a two-way swing arm. The surface temperature of the modified asphalt in the spreading section should be 160-170°C. 4a) Compacting and drying the material obtained in step 3a).

2. The environmentally friendly exposed modified asphalt waterproof membrane according to claim 1, characterized in that: The asphalt material includes one or more of petroleum asphalt, emulsified petroleum asphalt or modified asphalt.

3. The environmentally friendly exposed modified asphalt waterproof roll material according to claim 1 or 2, characterized in that: The coarse aggregate includes one or more of gravel, steel slag, and slag.

4. The environmentally friendly exposed modified asphalt waterproof membrane according to claim 1 or 2, characterized in that: The filler includes mineral powder obtained by grinding limestone or basalt strong basic rock.

5. The environmentally friendly exposed modified asphalt waterproof membrane according to claim 1 or 2, characterized in that: The filler is cement, lime or fly ash.

6. The environmentally friendly exposed modified asphalt waterproof membrane according to claim 1 or 2, characterized in that: The recycled asphalt stone comprises asphalt material which is modified asphalt, coarse aggregate which is gravel, and filler which is basalt.

7. The environmentally friendly exposed modified asphalt waterproof membrane according to claim 1 or 2, characterized in that: A 10 cm overlap is reserved at the edge of the upper surface environmentally friendly exposed covering material. The overlap is made of a PE film or a silicon-coated isolation film according to the construction method.

8. The environmentally friendly exposed modified asphalt waterproof membrane according to claim 1 or 2, characterized in that: The upper surface modified asphalt and the lower surface modified asphalt are the same or different polymer modified asphalt materials.

9. The environmentally friendly exposed modified asphalt waterproof membrane according to claim 8, characterized in that: The materials of the upper surface modified asphalt and the lower surface modified asphalt are the same polymer modified asphalt material, and the polymer modified asphalt material, in parts by weight, comprises the following components: Petroleum asphalt: 55-65 parts; Modifier SBS: 8-14 parts; Other additives: 4-8 parts; and Inorganic filler: 20~30 parts.

10. The environmentally friendly exposed modified asphalt waterproof membrane according to claim 1 or 2, characterized in that: The tire base is one or more of a polyester tire, a glass fiber tire or a glass fiber reinforced polyester tire.

11. The environmentally friendly exposed modified asphalt waterproof membrane according to claim 1 or 2, characterized in that: The lower surface isolation film is one or more of a polyethylene film, a silicon-coated isolation film or fine sand.

12. A method for preparing the environmentally friendly exposed modified asphalt waterproof membrane according to any one of claims 1 to 11, characterized in that: The preparation method is as follows: 1) The base is unfolded, and sequentially undergoes drying, pre-soaking, and squeezing processes before entering an oiling tank, where modified asphalt is coated on the upper and lower surfaces of the base, respectively, to obtain a modified asphalt coated coil; 2) The modified asphalt coiled material coated in step 1) is placed into a cooling water bed to begin cooling, and an environmentally friendly exposed covering material is spread on the modified asphalt surface after it exits the water bed; 3) Covering the lower surface of the modified asphalt with a lower surface isolation film by adsorption drying or hot air drying; 4) The modified asphalt membrane coated with the isolation film obtained in step 3) is then cooled and shaped by rollers, and then conveyed to a baler for winding, cutting, and packaging to produce an environmentally friendly exposed modified asphalt waterproof membrane.

13. The preparation method according to claim 12, characterized in that In step 1), the drying equipment is heat-conducting oil or resistance heating air conduction heating, the heating temperature is 160-180°C, and the heating surface tire base travel is 3.5-4.5m.

14. The preparation method according to claim 12, characterized in that In step 1), during the pre-impregnation process of the tire base, the pre-impregnation temperature is 180-200° C., and the pre-impregnation viscosity at 160° C. is 6-20 dPa·S.

15. The preparation method according to claim 12, characterized in that In step 1), during the oiling process of the tire base, the temperature of the modified asphalt coated on the upper and lower surfaces is 175-195°C.

16. The preparation method according to claim 12, characterized in that The thickness of the modified asphalt on the upper surface is 0.8-1.8 mm, and the thickness of the modified asphalt on the lower surface is 1.0-2.0 mm.

17. The preparation method according to claim 12, characterized in that In step 2), the water bed is cooled by circulating water, and the cooling temperature is controlled at 20-55°C.

18. The preparation method according to claim 12, characterized in that: In step 2), the spreading process of the environmentally friendly exposed covering material includes the following steps: 1a) Add the environmentally friendly exposed cladding material into the heating hopper and heat it to 80-100℃ for preheating for 15-20 minutes; 2a) Spraying surfactant, stirring and spraying at the same time, the spraying speed is controlled at 0.8-1.0kg / min, and stirring is performed for 5-10 minutes after spraying. The amount of surfactant used is 8-15kg per ton of environmentally friendly exposed cladding material; 3a) Discharge the environmentally friendly exposed cladding material after spraying into the lower hopper, and immediately spread it to the modified asphalt surface on the upper surface of the cooling water bed using a two-way swing arm. The surface temperature of the modified asphalt in the spreading section should be 160-170°C. 4a) Compacting and drying the material obtained in step 3a).

19. The preparation method according to claim 12, characterized in that: The tackifying resin is one or more of rosin resin, coumarone resin or C5 petroleum resin.

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