Waterproof hot melt adhesive membrane for TPO waterproof coiled material, preparation method of waterproof hot melt adhesive membrane and TPO waterproof coiled material

Abstract

The invention discloses a waterproof hot melt adhesive film for a TPO waterproof coiled material, a preparation method of the waterproof hot melt adhesive film and the TPO waterproof coiled material, and relates to the field of adhesive films for waterproof coiled materials. The waterproof hot melt adhesive film for the TPO waterproof coiled material comprises the following components in parts by weight: 100 parts of a base material, 0.2-1.0 part of an antioxidant and 0.2-1.0 part of an ultraviolet absorbent, the base material is prepared from 5-10 wt% of resin with an active unsaturated functional group, 25-50 wt% of rubber, 30-50 wt% of tackifying resin and 10-20 wt% of a softening agent, the resin with the active unsaturated functional group adopts at least one of aliphatic polyurethane acrylate with the functionality of 2-3 and vinyl ester resin, and the rubber comprises at least one of SIS (styrene-isoprene-styrene) rubber and SBS (styrene-butadiene-styrene) rubber. The waterproof hot melt adhesive film has heat aging resistance, ultraviolet aging resistance, flexibility and bonding stability, and the service life of the TPO waterproof coiled material is prolonged.

Description

Technical Field

[0001] The present application relates to the field of adhesive films for waterproof rolls, and in particular to a waterproof hot-melt adhesive film for TPO waterproof rolls, a preparation method thereof, and a TPO waterproof roll. Background Art

[0002] TPO waterproofing membranes are widely used in roofing waterproofing due to their excellent weather resistance, chemical resistance, and puncture resistance. Hot-melt adhesives are key to achieving good adhesion and waterproofing performance, and their performance directly impacts the overall quality and service life of TPO waterproofing membranes.

[0003] Among them, TPO waterproof membranes for roofing are required to have excellent resistance to moisture and heat aging and UV aging. Therefore, the hot melt adhesive used in TPO waterproof membranes for roofing must also meet the requirements of excellent resistance to moisture and heat aging and UV aging. However, the moisture and heat aging resistance and UV aging resistance of ordinary hot melt adhesives still have room for further improvement. At the same time, the hot melt adhesive also needs to have both flexibility and bonding stability to the TPO waterproof substrate. Summary of the Invention

[0004] In order to further improve the moisture-heat aging resistance and UV aging resistance of the hot melt adhesive for TPO waterproof membrane used in the relevant technology, while taking into account the flexibility of the hot melt adhesive and the bonding stability of the hot melt adhesive to the TPO waterproof substrate, the present application provides a waterproof hot melt adhesive film for TPO waterproof membrane, a preparation method thereof, and a TPO waterproof membrane.

[0005] In the first aspect, the present application provides a waterproof hot melt adhesive film for TPO waterproof membrane, which adopts the following technical solution: a waterproof hot melt adhesive film for TPO waterproof membrane, comprising an adhesive layer, wherein the adhesive layer comprises 100 parts by weight of a base material, 0.2-1.0 parts by weight of an antioxidant, and 0.2-1.0 parts by weight of an ultraviolet absorber; the base material is composed of 5-10wt% of a resin with an active unsaturated functional group, 25-50wt% of a rubber, 30-50wt% of a tackifying resin, and 10-20wt% of a softener, and the resin with an active unsaturated functional group adopts at least one of a 2-3-functionality aliphatic polyurethane acrylate and a vinyl ester resin, and the rubber comprises at least one of SIS rubber and SBS rubber.

[0006] In this application, the waterproof hot-melt adhesive film is made from a specific ratio of a resin with unsaturated functional groups, rubber, a tackifying resin, a softener, an antioxidant, and a UV absorber. The specific ratio of the resin with unsaturated functional groups and the soft segments in the rubber are cross-linked via electron beam irradiation to improve the aging resistance and adhesion of the hot-melt adhesive film, effectively extending the service life of the TPO waterproof membrane. Adding an appropriate amount of tackifying resin to the resin with unsaturated functional groups and rubber further improves the adhesion of the hot-melt adhesive film to the TPO waterproof substrate, thereby improving the waterproof performance of the TPO waterproof membrane and further extending its service life. In addition, the combination of specific resins with unsaturated functional groups and softeners can improve the flexibility of the hot melt adhesive film, reduce the risk of embrittlement of the hot melt adhesive film, and also help improve the waterproof performance and service life of the TPO waterproof membrane; and the addition of antioxidants and UV absorbers, antioxidants can remove free radicals or decompose hydrogen peroxides to prevent thermal oxidative degradation of raw materials, and UV absorbers can absorb ultraviolet light to prevent the yellowing problem of hot melt adhesives, further improving the UV aging resistance of the hot melt adhesive film.

[0007] In some specific embodiments, the resin with active unsaturated functional groups includes difunctional aliphatic polyurethane acrylate, trifunctional aliphatic polyurethane acrylate and phenolic epoxy modified vinyl ester resin in a weight ratio of (5-6): (0.5-1): (3.5-4).

[0008] In the present application, the resin with active unsaturated functional groups preferably adopts a composition of difunctional aliphatic polyurethane acrylate, trifunctional aliphatic polyurethane acrylate and phenolic epoxy modified vinyl ester resin in a weight ratio of (5-6): (0.5-1): (3.5-4). By combining difunctional aliphatic polyurethane acrylate, trifunctional aliphatic polyurethane acrylate and phenolic epoxy modified vinyl ester resin, the initial adhesion strength and the lasting adhesion strength of the hot melt adhesive film to the TPO waterproof substrate can be improved, and the aging resistance and flexibility of the hot melt adhesive film can be further improved.

[0009] Among them, when the phenolic epoxy modified vinyl ester resin is directly replaced by vinyl ester resin, the initial adhesion strength of the hot melt adhesive film to the TPO waterproof substrate is not significantly improved.

[0010] In some specific embodiments, the rubber includes EPDM rubber, SIS rubber and SBS rubber in a weight ratio of 1:(5-6):(1-2).

[0011] In the present application, when the rubber is a composition of EPDM rubber, SIS rubber and SBS rubber in a specific ratio, it is combined with the above-mentioned specific ratio of difunctional aliphatic polyurethane acrylate, trifunctional aliphatic polyurethane acrylate and phenolic epoxy modified vinyl ester resin, which is beneficial to obtain a hot melt adhesive film that has excellent aging resistance, initial adhesion and lasting adhesion, as well as flexibility. At the same time, it is also beneficial to the uniform mixing of the raw materials. For hot melt adhesive films with a thickness of the adhesive layer in the range of 100-500μm, the thickness uniformity and stability are excellent.

[0012] In some specific embodiments, the SIS rubber has a block ratio S / I of (15-20) / (80-85) and a melt index of 10-20 g / 10 min (200° C. / 5 kg).

[0013] In some specific embodiments, in the SBS rubber, the block ratio S / B is (20-30) / (70-80), and the melt index is 1.0-3.0 g / 10 min (200° C. / 5 kg).

[0014] In some specific embodiments, the antioxidant is a hindered phenol antioxidant or a combination of a hindered phenol antioxidant and a phosphite antioxidant, wherein the amount of the hindered phenol antioxidant is 0.08-0.12% by weight of the base material.

[0015] In the present application, the antioxidant is a combination of a hindered phenol antioxidant and a phosphite antioxidant, and the amount of the hindered phenol antioxidant is controlled to 0.08-0.12% by weight of the base material, which is beneficial for preventing the thermal oxidative degradation of the raw materials and also preventing the antioxidant from affecting the subsequent radiation cross-linking process.

[0016] In some specific embodiments, the tackifying resin is at least one of C5 / C9 copolymer petroleum resin, DCPD resin, C5 petroleum resin, C9 petroleum resin, and terpene phenol resin.

[0017] In some specific embodiments, the softener is at least one of naphthenic oil and polyisobutylene.

[0018] In a second aspect, the present application provides a method for preparing a waterproof hot melt adhesive film for TPO waterproof membrane using the following technical solution: A method for preparing a waterproof hot melt adhesive film for TPO waterproof membrane comprises the following steps: Put rubber, softener, tackifying resin and antioxidant into a reaction kettle, stir and mix evenly at 160-200°C to obtain a premix; A resin with an active unsaturated functional group and an ultraviolet absorber are added to the premix, stirred evenly, and discharged to obtain a hot melt adhesive; the hot melt adhesive is heated to 140-180° C. to form a glue, and the hot melt adhesive is extruded and coated onto a release film by a coating machine to form an adhesive film; the adhesive film is irradiated with an electron beam at an irradiation voltage of 60-150 kV and an irradiation dose of 30-180 kGy, and after irradiation is completed, the film is rolled up to obtain a waterproof hot melt adhesive film for TPO waterproof membrane.

[0019] In the hot melt adhesive film for TPO waterproof coiled material, the thickness of the hot melt adhesive layer is 100-500 μm.

[0020] The release film is preferably a double silicon release PET film.

[0021] In a third aspect, the present application provides a TPO waterproof membrane adopting the following technical solution: A TPO waterproof membrane comprises a TPO waterproof substrate and any one of the above-mentioned waterproof hot-melt adhesive films for TPO waterproof membranes, wherein the waterproof hot-melt adhesive film for TPO waterproof membranes is pressed onto the surface of the TPO waterproof substrate.

[0022] In this application, the TPO waterproof membrane is cold-pressed onto the surface of the TPO waterproof substrate with a hot-melt adhesive film. The lamination pressure is 2-5 kgf / cm 2 .

[0023] In summary, this application has at least the following beneficial effects: (1) In the present application, the waterproof hot melt adhesive film is prepared from a specific ratio of resin with unsaturated functional groups, rubber, tackifying resin, softener, antioxidant and ultraviolet absorber, wherein the specific ratio of resin with unsaturated functional groups and the soft segment in the rubber can be cross-linked by electron beam irradiation to improve the aging resistance and adhesion of the hot melt adhesive film, effectively improving the service life of the TPO waterproof membrane. Further adding an appropriate amount of tackifying resin to the resin and rubber with unsaturated functional groups can further improve the adhesion of the hot melt adhesive film to the TPO waterproof substrate, which is beneficial to improving the waterproof performance of the TPO waterproof membrane and further extending the service life of the TPO waterproof membrane. In addition, the combination of the specific resin with unsaturated functional groups and the softener can improve the flexibility of the hot melt adhesive film, reduce the risk of embrittlement of the hot melt adhesive film, and also help improve the waterproof performance and service life of the TPO waterproof membrane.

[0024] (2) In the present application, the resin with active unsaturated functional groups is preferably a composition of difunctional aliphatic polyurethane acrylate, trifunctional aliphatic polyurethane acrylate and phenolic epoxy modified vinyl ester resin in a weight ratio of (5-6): (0.5-1): (3.5-4). By combining difunctional aliphatic polyurethane acrylate, trifunctional aliphatic polyurethane acrylate and phenolic epoxy modified vinyl ester resin, the initial adhesion strength and the sustained adhesion strength of the hot melt adhesive film to the TPO waterproof substrate can be improved, and the aging resistance and flexibility of the hot melt adhesive film can be further improved.

[0025] (3) In the present application, when the rubber is a composition of EPDM rubber, SIS rubber and SBS rubber in a specific ratio, and is combined with the above-mentioned specific ratio of difunctional aliphatic polyurethane acrylate, trifunctional aliphatic polyurethane acrylate and phenolic epoxy modified vinyl ester resin, it is beneficial to obtain a hot melt adhesive film that has excellent aging resistance, initial adhesion and lasting adhesion, and flexibility. At the same time, it is also beneficial to uniform mixing between the raw materials. For hot melt adhesive films with a thickness of the adhesive layer in the range of 100-500 μm, the thickness uniformity and stability are excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of a TPO waterproof membrane in this application.

[0027] Description of reference numerals: 1. TPO waterproof substrate; 2. Waterproof hot melt adhesive film for TPO waterproof membrane. DETAILED DESCRIPTION

[0028] The present application is further described below in conjunction with specific experiments. Example

[0029] [Example 1] A waterproof hot-melt adhesive film for TPO waterproof membranes comprises an adhesive layer and a release film. In this embodiment, the release film is a double-silicon release PET film. The adhesive layer comprises 100 kg of base material, 0.2 kg of antioxidant, and 1.0 kg of UV absorber. The base material is made of 10 wt% of a resin with active unsaturated functional groups, 50 wt% of rubber, 30 wt% of a tackifying resin, and 10 wt% of a softener. The resin with active unsaturated functional groups is a difunctional aliphatic polyurethane acrylate (Inoue Chemical, UV-2312A); the rubber is SIS rubber; the SIS rubber is SIS rubber with a grade of 1105 from Baling Petrochemical, wherein the S / I ratio is 15 / 85 and the melt index of the SIS rubber is 10 g / 10 min; The tackifying resin is specifically C5 / C9 copolymer petroleum resin (Exxon, brand 5400); The softener specifically uses polyisobutylene (polyisobutylene PB950).

[0030] The antioxidant used is a combination of antioxidant 1010 and antioxidant 168, with 0.12 kg of antioxidant 1010 and 0.08 kg of antioxidant 168.

[0031] The ultraviolet absorber specifically used is ultraviolet absorber UV-326.

[0032] In this embodiment, the method for preparing a waterproof hot melt adhesive film for TPO waterproof membrane comprises the following steps: Put rubber, softener, tackifying resin and antioxidant into a reactor, stir and mix them evenly at 200°C to obtain a premix; Adding a resin with an active unsaturated functional group and a UV absorber to the premix, stirring evenly, and discharging the material to obtain a hot melt adhesive; heating the hot melt adhesive to 180°C to form a glue, and then extruding the adhesive film by coating; The adhesive film is irradiated by electron beam, with an irradiation voltage of 60 kV and an irradiation dose of 180 kGy. After the irradiation is completed, the film is rolled up to obtain a waterproof hot-melt adhesive film for TPO waterproof membrane.

[0033] [Example 2] A waterproof hot-melt adhesive film for TPO waterproof membrane, comprising an adhesive layer and a release film. In this embodiment, the release film is a double-silicon release PET film. The adhesive layer comprises 100 kg of base material, 1 kg of antioxidant, and 0.2 kg of UV absorber. The base material is made of 5 wt% of a resin with active unsaturated functional groups, 25 wt% of rubber, 50 wt% of a tackifying resin, and 20 wt% of a softener. The resin with active unsaturated functional groups is trifunctional aliphatic polyurethane acrylate (Inoue Chemical, UV-3000C); the rubber is SBS rubber (YH-791E from Baling Petrochemical), in which the S / B ratio is 30 / 70 and the melt index of the SBS rubber is 1.5 g / 10 min; The tackifying resin specifically adopts C5 petroleum resin (Exxon E1204); The softener specifically uses KN4010 naphthenic oil.

[0034] The antioxidant used is a combination of antioxidant 1010 and antioxidant 168, with 0.08 kg of antioxidant 1010 and 0.92 kg of antioxidant 168.

[0035] The ultraviolet absorber specifically used is ultraviolet absorber UV-327.

[0036] In this embodiment, the method for preparing a waterproof hot melt adhesive film for TPO waterproof membrane comprises the following steps: Put rubber, softener, tackifying resin and antioxidant into a reactor, stir and mix them evenly at 160°C to obtain a premix; A resin with an active unsaturated functional group and an ultraviolet absorber are added to the premix, stirred evenly, and discharged to obtain a hot melt adhesive; the hot melt adhesive is heated to 140° C. to form a glue, and the hot melt adhesive is extruded and coated onto a double-silicone release PET film by a coating machine to form an adhesive film; the adhesive film is irradiated with an electron beam at an irradiation voltage of 150 kV and an irradiation dose of 30 kGy, and after irradiation is completed, the film is rolled up to obtain a waterproof hot melt adhesive film for TPO waterproof membrane.

[0037] [Example 3] A waterproof hot-melt adhesive film for TPO waterproof membrane differs from Example 1 in that the composition of the resin with active unsaturated functional groups is different. In this example, the resin with active unsaturated functional groups is a composition of difunctional aliphatic polyurethane acrylate (Inoue Chemical, UV-2312A) and trifunctional aliphatic polyurethane acrylate (Inoue Chemical, UV-3000C) in a weight ratio of 5:1.

[0038] [Example 4] A waterproof hot-melt adhesive film for TPO waterproof membrane differs from Example 1 in that the composition of the resin with active unsaturated functional groups is different. In this example, the resin with active unsaturated functional groups is a composition of a difunctional aliphatic polyurethane acrylate (Inoue Chemical, UV-2312A) and a phenolic epoxy-modified vinyl ester resin (SWANCORCHEMPULSE907) in a weight ratio of 5:4.

[0039] [Example 5] A waterproof hot-melt adhesive film for TPO waterproof membrane differs from Example 1 in that the composition of the resin with active unsaturated functional groups is different. In this example, the resin with active unsaturated functional groups is a composition of trifunctional aliphatic polyurethane acrylate (Inoue Chemical, UV-3000C) and phenolic epoxy-modified vinyl ester resin (SWANCORCHEMPULSE907) in a weight ratio of 1:4.

[0040] [Example 6] A waterproof hot-melt adhesive film for TPO waterproof membrane differs from Example 1 in that the composition of the resin with active unsaturated functional groups is different. In this example, the resin with active unsaturated functional groups is a difunctional aliphatic polyurethane acrylate (Inoue Chemical, UV-2312A), a trifunctional aliphatic polyurethane acrylate (Inoue Chemical, UV-3000C), and a phenolic epoxy-modified vinyl ester resin (SWANCOR CHEMPULSE907), with the weight ratio of the three being 5:1:4.

[0041] [Example 7] A waterproof hot-melt adhesive film for TPO waterproof membrane differs from Example 1 in that the composition of the resin with active unsaturated functional groups is different. In this example, the resin with active unsaturated functional groups is a difunctional aliphatic polyurethane acrylate (Inoue Chemical, UV-2312A), a trifunctional aliphatic polyurethane acrylate (Inoue Chemical, UV-3000C), and a phenolic epoxy-modified vinyl ester resin (SWANCOR CHEMPULSE907), with the weight ratio of the three being 1:1:1.

[0042] [Example 8] A waterproof hot-melt adhesive membrane for TPO waterproofing membrane differs from Example 6 in the rubber composition. In this example, the rubber comprises EPDM rubber (Dow 4725P), SIS rubber (Baling Petrochemical brand 1105), and SBS rubber (Baling Petrochemical YH-791E) in a weight ratio of 1:5.5:1.5.

[0043] [Example 9] A waterproof hot-melt adhesive membrane for TPO waterproofing membrane differs from Example 7 in the rubber composition. In this example, the rubber comprises EPDM rubber (Dow 4725P), SIS rubber (Baling Petrochemical brand 1105), and SBS rubber (Baling Petrochemical YH-791E) in a weight ratio of 1:5.5:1.5.

[0044] Comparative Example [Comparative Example 1] A hot melt adhesive film differs from Example 1 in that the ratio of the components in the base material is different from that in Example 1, but otherwise remains the same as Example 1. In this comparative example, the base material is prepared from 20 wt% of a resin having an active unsaturated functional group, 40 wt% of rubber, 30 wt% of a tackifying resin, and 10 wt% of a softener.

[0045] Application Examples Application Example 1 A TPO waterproof membrane, refer to Figure 1, comprising a TPO waterproof substrate and a waterproof hot melt adhesive film for TPO waterproof membrane in [Example 1], wherein the adhesive layer of the waterproof hot melt adhesive for TPO waterproof membrane is adhered to the TPO waterproof substrate, and the waterproof hot melt adhesive film for TPO waterproof membrane is pressed onto the surface of the TPO waterproof substrate at a pressure of 3.5 kgf / cm 2 The thickness of the adhesive layer in the waterproof hot melt adhesive film used for TPO waterproof membrane is 100μm.

[0046] Application Example 2 A TPO waterproof membrane, which differs from [Application Example 1] in that: the waterproof hot-melt adhesive film for the TPO waterproof membrane adopts the waterproof hot-melt adhesive film for the TPO waterproof membrane in [Example 2].

[0047] Application Example 3 A TPO waterproof membrane, which differs from [Application Example 1] in that: the waterproof hot-melt adhesive film for the TPO waterproof membrane adopts the waterproof hot-melt adhesive film for the TPO waterproof membrane in [Example 3].

[0048] Application Example 4 A TPO waterproof membrane, which differs from [Application Example 1] in that: the waterproof hot-melt adhesive film for the TPO waterproof membrane adopts the waterproof hot-melt adhesive film for the TPO waterproof membrane in [Example 4].

[0049] Application Example 5 A TPO waterproof membrane, which differs from [Application Example 1] in that: the waterproof hot-melt adhesive film for the TPO waterproof membrane adopts the waterproof hot-melt adhesive film for the TPO waterproof membrane in [Example 5].

[0050] Application Example 6 A TPO waterproof membrane, which differs from [Application Example 1] in that: the waterproof hot-melt adhesive film for the TPO waterproof membrane adopts the waterproof hot-melt adhesive film for the TPO waterproof membrane in [Example 6].

[0051] Application Example 7 A TPO waterproof membrane, which differs from [Application Example 1] in that: the waterproof hot-melt adhesive film for the TPO waterproof membrane adopts the waterproof hot-melt adhesive film for the TPO waterproof membrane in [Example 7].

[0052] Application Example 8 A TPO waterproof membrane, which differs from [Application Example 1] in that: the waterproof hot-melt adhesive film for the TPO waterproof membrane adopts the waterproof hot-melt adhesive film for the TPO waterproof membrane in [Example 8].

[0053]

Application Example 9

[0054] Comparative Application Examples

Comparative Application Example 1

[0055] Performance testing 1. TPO Waterproofing Membrane Seam Peel Strength: The maximum seam peel strength (without damage) of the TPO waterproofing membranes produced in each application example and comparative application example was tested according to GB / T 328.21. The results are recorded in Table 1 below. The TPO waterproofing membranes were 200mm x 50mm in size, with a 50mm overlap width. After the overlap, the test pieces were left standing for 4 hours and 72 hours, respectively. A higher peel strength at 4 hours indicates better initial adhesion. Furthermore, the test pieces, which had been left standing for 72 hours, were aged at 70°C for 28 days and immersed in water for 28 days, and then retested for peel strength. A higher peel strength retention indicates better heat aging and water resistance of the hot-melt adhesive film.

[0056] 2. Waterproof performance of TPO waterproof membrane: Referring to method B in standards GB / T 27789-2011 and GB / T 328.10-2007, the water-proof performance of the TPO waterproof membrane prepared in each application example and the comparative application example was tested under normal conditions, after heat aging at 115°C for 72 hours, and after artificial climate accelerated aging for 2500 hours. The pressures were 0.3 MPa and 0.8 MPa, respectively, and the holding time was 2 hours. The results are recorded in Table 2 below.

[0057] 3. Impact resistance of TPO waterproof membrane: The impact resistance of the TPO waterproof membrane prepared in each application example and comparative application example was tested with reference to the standard GB / T 27789-2011. The weight of the falling hammer was 1 kg, and the heights were 500 mm and 600 mm, respectively. The results are recorded in Table 3 below.

[0058] 4. Thickness Uniformity of Waterproof Hot-Melt Adhesive Films: Hot-melt adhesive films with adhesive layer thicknesses of 100 μm and 500 μm were prepared according to Examples 1-9 and Comparative Example 1, respectively. The thickness of the waterproof hot-melt adhesive films was then tested at five randomly selected points from each of the waterproof hot-melt adhesive films of different thicknesses. The average thickness of the waterproof hot-melt adhesive film and the standard deviation of the five points were calculated, and the results are recorded in Table 4 below.

[0059] Table 1 Table 2 Note: The value before “ / ” represents the water-impermeability test result of 0.3MPa, and the value after “ / ” represents the water-impermeability test result of 0.8MPa.

[0060] Table 3 Table 4 Note: The value before “ / ” is the average thickness, and the value after “ / ” is the standard deviation.

[0061] Combined with the data recorded in the above-mentioned Application Example 1, Application Examples 3-7 and Tables 1-3, it can be seen that: in this application, the resin with active unsaturated functional groups preferably adopts a composition of difunctional aliphatic polyurethane acrylate, trifunctional aliphatic polyurethane acrylate and phenolic epoxy modified vinyl ester resin in a weight ratio of (5-6): (0.5-1): (3.5-4). By combining the difunctional aliphatic polyurethane acrylate, trifunctional aliphatic polyurethane acrylate and phenolic epoxy modified vinyl ester resin, the initial adhesion strength and the sustained adhesion strength of the hot melt adhesive film to the TPO waterproof substrate can be improved, and the aging resistance and flexibility of the hot melt adhesive film can be further improved.

[0062] Combining the data recorded in the above-mentioned Examples 6-9, Application Examples 6-9 and Tables 1-4, it can be seen that when the rubber adopts a composition of EPDM rubber, SIS rubber and SBS rubber in a specific ratio, it is combined with a composition of difunctional aliphatic polyurethane acrylate, trifunctional aliphatic polyurethane acrylate and phenolic epoxy modified vinyl ester resin in a preferred ratio, which is conducive to obtaining a waterproof hot melt adhesive film with excellent aging resistance, initial adhesion and sustained adhesion, and flexibility. At the same time, it is also conducive to uniform mixing between the raw materials. For waterproof hot melt adhesive films with a thickness range of 100-500μm, the thickness uniformity and stability are better.

[0063] This specific implementation manner is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the specific implementation manner as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A waterproof hot melt adhesive film for TPO waterproof membrane, characterized by: The invention comprises an adhesive layer, wherein the adhesive layer comprises 100 parts by weight of a base material, 0.2-1.0 parts by weight of an antioxidant, and 0.2-1.0 parts by weight of an ultraviolet absorber; the base material comprises 5-10 wt% of a resin with an active unsaturated functional group, 25-50 wt% of rubber, 30-50 wt% of a tackifying resin, and 10-20 wt% of a softener, and the resin with an active unsaturated functional group is at least one of a 2-3 functional aliphatic polyurethane acrylate and a vinyl ester resin, and the rubber comprises at least one of SIS rubber and SBS rubber.

2. The waterproof hot melt adhesive film for TPO waterproof membrane according to claim 1, characterized in that: The resin with active unsaturated functional groups includes difunctional aliphatic polyurethane acrylate, trifunctional aliphatic polyurethane acrylate and phenolic epoxy modified vinyl ester resin in a weight ratio of (5-6): (0.5-1): (3.5-4).

3. The waterproof hot melt adhesive film for TPO waterproof membrane according to claim 2, characterized in that: The rubber includes EPDM rubber, SIS rubber and SBS rubber in a weight ratio of 1:(5-6):(1-2).

4. The waterproof hot melt adhesive film for TPO waterproof membrane according to claim 3, characterized in that: In the SIS rubber, the block ratio S / I is (15-20) / (80-85), and the melt index is 10-20 g / 10 min (200° C. / 5 kg).

5. The waterproof hot melt adhesive film for TPO waterproof membrane according to claim 3, characterized in that: In the SBS rubber, the block ratio S / B is (20-30) / (70-80), and the melt index is 1.0-3.0 g / 10 min (200° C. / 5 kg).

6. The waterproof hot melt adhesive film for TPO waterproof membrane according to claim 1, characterized in that: The antioxidant is a hindered phenol antioxidant or a combination of a hindered phenol antioxidant and a phosphite antioxidant, wherein the amount of the hindered phenol antioxidant is 0.08-0.12% by weight of the base material.

7. The waterproof hot melt adhesive film for TPO waterproof membrane according to claim 1, characterized in that: The tackifying resin is at least one of C5 / C9 copolymerized tackifying resin, DCPD resin, C5 tackifying resin, C9 tackifying resin, and terpene phenol resin.

8. The waterproof hot melt adhesive film for TPO waterproof membrane according to claim 1, characterized in that: The softener is at least one of naphthenic oil and polyisobutylene.

9. A method for preparing a waterproof hot melt adhesive film for TPO waterproof membrane according to any one of claims 1 to 8, characterized in that: The following steps are involved: Put rubber, softener, tackifying resin and antioxidant into a reaction kettle, stir and mix evenly at 160-200°C to obtain a premix; Adding a resin with an active unsaturated functional group and a UV absorber to the premix, stirring evenly, and discharging the mixture to obtain a hot melt adhesive; Heat the hot melt adhesive to 140-180℃ to form a glue, and extrude the hot melt adhesive onto the release film through a coating machine to form a film; The adhesive film is irradiated by electron beam, with an irradiation voltage of 60-150kV and an irradiation dose of 30-180kGy. After the irradiation is completed, the film is rolled up to obtain a waterproof hot melt adhesive film for TPO waterproof membrane.

10. A TPO waterproof membrane, characterized by: The invention comprises a TPO waterproof substrate and a waterproof hot-melt adhesive film for TPO waterproof roll according to any one of claims 1 to 8, wherein the waterproof hot-melt adhesive film for TPO waterproof roll is pressed onto the surface of the TPO waterproof substrate.

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