Flame Retardant Hot Melt Pressure Sensitive Adhesive, Its Preparation Method and Optical Fiber Cable

Abstract

The present invention relates to the technical field of adhesives, and in particular to a flame-retardant hot-melt pressure-sensitive adhesive, its preparation method and an optical fiber cable. The flame-retardant hot-melt pressure-sensitive adhesive comprises the following components in parts by weight: 40-60 parts of a star-shaped styrene block copolymer, 15-25 parts of a hydrogenated tackifying resin, 10-25 parts of a liquid tackifying resin, 10-20 parts of a flame retardant, 5-8 parts of a pure monomer resin, 1-2 parts of a photoinitiator and 0.1-1 part of an antioxidant; the glass transition temperature of the liquid tackifying resin is -30 to -10 °C. The flame-retardant hot-melt pressure-sensitive adhesive of the present invention uses a star-shaped styrene block copolymer as the main material, in combination with a hydrogenated tackifying resin, a liquid tackifying resin and a pure monomer resin, etc., and no plasticizer is introduced, ensuring the high and low temperature resistance of the hot-melt pressure-sensitive adhesive, while improving the adhesion, weather resistance, etc. It can be directly pre-coated on the surface of the optical fiber cable, and there is no need to heat and melt during construction, and it can be directly pasted, improving the convenience of operation.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, and in particular to a flame-retardant hot-melt pressure-sensitive adhesive, a preparation method thereof, and an optical fiber cable. Background Art

[0002] Traditional optical cables need to be fixed by arranging tapes or staples on the wall, which not only damages the wall surface but also has cumbersome operations. Fixing the optical cable by applying glue for self-adhesion not only has less damage but also is relatively simple in operation, and can be quickly and easily installed around skirting lines, doors and windows, and decorative strips, meeting the requirements for household entry. However, the glue used for optical cables has high requirements for the performance of the glue, which not only requires high resistance to high and low temperatures, but also needs to have good adhesion to various substrates, good ultraviolet resistance, and good environmental reliability. In the existing market, the open time of the self-adhesive coating glue of the EVA system is short, and the curing strength or initial tack is poor, resulting in poor construction effects, while the coating device process requires a long production time, resulting in low actual production efficiency. For the self-adhesive glue of the rubber system, due to the presence of unsaturated double bonds in the main material, the weather resistance is poor, and it cannot meet the application environment performance requirements of optical cables.

[0003] The Chinese patent application with the publication number CN105969252A records a self-adhesive coating glue, which uses ethylene-ethyl acrylate copolymer as the main material and adds tackifiers, synthetic waxes, etc., so that the transparency of the self-adhesive coating glue is improved after curing, the open time is extended, and the uncured strength and initial tack are improved. However, when constructing this self-adhesive coating glue, it is necessary to heat and melt the glue layer before bonding, with high technical difficulty and low construction efficiency, and it is difficult to meet the requirements of large-scale and rapid construction.

[0004] The Chinese patent application with the publication number CN117304869A records a flame-retardant transparent hot-melt pressure-sensitive adhesive, which is composed of a main resin, a tackifying resin, an antioxidant, a plasticizer, a flame retardant, and an anti-aging agent, and can ensure certain bonding performance and construction simplicity. However, the main resin used in this hot-melt pressure-sensitive adhesive has unsaturated double bonds and is prone to aging, and the introduction of the plasticizer makes the plasticizer prone to precipitation after long-term use, resulting in problems such as loss of adhesion and aging of the glue.

[0005] In view of this, the present invention is specifically proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a flame-retardant hot-melt pressure-sensitive adhesive, a preparation method thereof, and an optical fiber cable. The flame-retardant hot-melt pressure-sensitive adhesive of the present invention has excellent bonding performance and weather resistance, can meet the application environment requirements of the optical fiber cable, and can be pre-coated on the optical fiber cable. During construction, it can be directly pasted without heating and melting, and the operation is convenient.

[0007] To achieve the above object of the present invention, the first aspect of the present invention provides a flame-retardant hot-melt pressure-sensitive adhesive, comprising the following components by weight:

[0008] 40-60 parts of a star-shaped styrene block copolymer, 15-25 parts of a hydrogenated tackifying resin, 10-25 parts of a liquid tackifying resin, 10-20 parts of a flame retardant, 5-8 parts of a pure monomer resin, 1-2 parts of a photoinitiator, and 0.1-1 part of an antioxidant;

[0009] The glass transition temperature Tg of the liquid tackifying resin is -30 to -10 °C.

[0010] In a specific embodiment of the present invention, the star-shaped styrene block copolymer includes at least one of a star-shaped block copolymer SIS and a star-shaped block copolymer SBS.

[0011] In a specific embodiment of the present invention, the hydrogenated tackifying resin includes at least one of a hydrogenated petroleum resin and a hydrogenated rosin resin.

[0012] In a specific embodiment of the present invention, the liquid tackifying resin includes at least one of a liquid petroleum resin and a liquid rosin resin.

[0013] In a specific embodiment of the present invention, the mass ratio of the hydrogenated tackifying resin to the liquid tackifying resin is (1.2-2):1.

[0014] In a specific embodiment of the present invention, the mass ratio of the star-shaped styrene block copolymer to the pure monomer resin is (6-10):1.

[0015] In a specific embodiment of the present invention, the flame retardant is a halogen-free flame retardant. Further, the particle size of the flame retardant is ≤20 μm.

[0016] In a specific embodiment of the present invention, the softening point of the pure monomer resin is 120-140 °C.

[0017] In a specific embodiment of the present invention, the pure monomer resin includes at least one of a poly-α-methylstyrene resin and an aromatic pure monomer resin.

[0018] The second aspect of the present invention provides a preparation method of the flame-retardant hot-melt pressure-sensitive adhesive of the first aspect of the present invention, comprising the following steps: mixing each component in proportion.

[0019] In a specific embodiment of the present invention, the mixing includes: mixing the star-shaped styrene block copolymer, the liquid tackifying resin, and the antioxidant, kneading at 160-180 °C for 40-50 min; then sequentially adding the hydrogenated tackifying resin and the flame retardant and mixing evenly, and then adding the photoinitiator, and evacuating to remove bubbles.

[0020] A third aspect of the present invention provides an optical fiber cable, comprising an optical fiber cable body and a hot melt pressure-sensitive adhesive layer provided on at least a part of the surface of the optical fiber cable body; the hot melt pressure-sensitive adhesive layer is made of the flame-retardant hot melt pressure-sensitive adhesive of the first aspect of the present invention.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] (1) For the flame-retardant hot melt pressure-sensitive adhesive of the present invention, a star-shaped styrene block copolymer is used as the main material, in combination with a hydrogenated tackifying resin, a liquid tackifying resin, and a pure monomer resin, etc. At the same time, no plasticizer is introduced, ensuring the high and low temperature resistance of the hot melt pressure-sensitive adhesive, and at the same time improving the adhesion and weather resistance, etc.;

[0023] (2) The flame-retardant hot melt pressure-sensitive adhesive of the present invention can be directly pre-coated on the surface of the optical fiber cable. During construction, it does not need to be heated and melted, and can be directly adhered, improving the convenience of operation. Specific Embodiments

[0024] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. However, those skilled in the art will understand that the following described embodiments are some embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Those not specified in the embodiments are carried out under conventional conditions or conditions recommended by the manufacturer. Reagents or instruments not specified by the manufacturer can all be obtained as conventional products through commercial purchase.

[0025] The first aspect of the present invention provides a flame-retardant hot melt pressure-sensitive adhesive, comprising the following components in parts by weight:

[0026] 40 - 60 parts of star-shaped styrene block copolymer, 15 - 25 parts of hydrogenated tackifying resin, 10 - 25 parts of liquid tackifying resin, 10 - 20 parts of flame retardant, 5 - 8 parts of pure monomer resin, 1 - 2 parts of photoinitiator, and 0.1 - 1 part of antioxidant.

[0027] For the flame-retardant hot melt pressure-sensitive adhesive of the present invention, a star-shaped styrene block copolymer is used as the main material, in combination with a hydrogenated tackifying resin, a liquid tackifying resin, and a pure monomer resin, etc. At the same time, no plasticizer is introduced, ensuring the high and low temperature resistance of the hot melt pressure-sensitive adhesive, and at the same time improving the adhesion and weather resistance, etc.

[0028] Specifically, a star-shaped styrene block copolymer is used as the main body in the flame-retardant hot-melt pressure-sensitive adhesive of the present invention. Compared with the linear styrene block copolymer, the density of the physical cross-linking region is large, which is more conducive to improving the elastic modulus, high-temperature resistance and oxidation resistance of the hot-melt pressure-sensitive adhesive. In different embodiments, based on the total amount of the flame-retardant hot-melt pressure-sensitive adhesive being 100 parts by weight, the amount of the star-shaped styrene block copolymer can be 40 parts, 45 parts, 50 parts, 55 parts, 60 parts or any range composed of any two of them by weight. By controlling the amount of the star-shaped styrene block copolymer within the above range, the strength and bonding performance of the hot-melt pressure-sensitive adhesive can be ensured while taking into account other factors.

[0029] In different embodiments, based on the total amount of the flame-retardant hot-melt pressure-sensitive adhesive being 100 parts by weight, the amount of the hydrogenated tackifying resin can be 15 parts, 18 parts, 20 parts, 22 parts, 25 parts or any range composed of any two of them by weight.

[0030] The present invention introduces a liquid tackifying resin into the hot-melt pressure-sensitive adhesive system, which helps to lower the glass transition temperature of the hot-melt pressure-sensitive adhesive. Without using a plasticizer, the low-temperature performance of the hot-melt pressure-sensitive adhesive is improved, and at the same time, problems such as the loss of adhesion of the glue caused by the precipitation of the plasticizer during the long-term use of the optical fiber cable are avoided. In different embodiments, based on the total amount of the flame-retardant hot-melt pressure-sensitive adhesive being 100 parts by weight, the amount of the liquid tackifying resin can be 10 parts, 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 25 parts or any range composed of any two of them by weight. The Tg of the liquid tackifying resin of the present invention is -30 to -10 °C, for example, it can be -30 °C, -25 °C, -20 °C, -15 °C, -10 °C or any range composed of any two of them.

[0031] In different embodiments, based on the total amount of the flame-retardant hot-melt pressure-sensitive adhesive being 100 parts by weight, the amount of the flame retardant can be 10 parts, 12 parts, 15 parts, 18 parts, 20 parts or any range composed of any two of them by weight.

[0032] In different embodiments, based on the total amount of the flame-retardant hot-melt pressure-sensitive adhesive being 100 parts by weight, the amount of the pure monomer resin can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts or any range composed of any two of them by weight. The present invention introduces a pure monomer resin into the hot-melt pressure-sensitive adhesive system. The pure monomer resin can modify the styrene end in the star-shaped styrene block copolymer, thereby balancing the viscosity, bonding performance and heat resistance of the hot-melt pressure-sensitive adhesive.

[0033] In different embodiments, taking the total amount of the flame-retardant hot-melt pressure-sensitive adhesive as 100 parts by weight, the amount of the photoinitiator can be 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts or the range composed of any two of them by weight. In the present invention, an appropriate amount of photoinitiator is introduced into the hot-melt pressure-sensitive adhesive system. After the prepared hot-melt pressure-sensitive adhesive is coated on the surface of the optical fiber cable and irradiated with ultraviolet light appropriately, part of the double bonds in the star-shaped styrene block copolymer are broken, generating free radicals to achieve chemical cross-linking, which can greatly improve the heat resistance and UV resistance during use of the hot-melt pressure-sensitive adhesive without affecting the bonding performance. Further, the photoinitiator can be a commercially available conventional photoinitiator, such as at least one of photoinitiator TPO and photoinitiator 184.

[0034] In different embodiments, taking the total amount of the flame-retardant hot-melt pressure-sensitive adhesive as 100 parts by weight, the amount of the antioxidant can be 0.1 part, 0.3 part, 0.5 part, 0.8 part, 1 part or the range composed of any two of them by weight. Further, the antioxidant can include at least one of hindered phenol antioxidants and phosphite antioxidants.

[0035] In a specific embodiment of the present invention, the star-shaped styrene block copolymer includes at least one of star-shaped block copolymer SIS and star-shaped block copolymer SBS.

[0036] In a specific embodiment of the present invention, the hydrogenated tackifying resin includes at least one of hydrogenated petroleum resin and hydrogenated rosin resin. Further, the softening point of the hydrogenated tackifying resin ≥ 100 °C, for example, it can be 100 °C, 105 °C, 110 °C, 115 °C, 120 °C or the range composed of any two of them.

[0037] In a specific embodiment of the present invention, the liquid tackifying resin includes at least one of liquid petroleum resin and liquid rosin resin.

[0038] In a specific embodiment of the present invention, the mass ratio of the hydrogenated tackifying resin to the liquid tackifying resin is (1.2 - 2) : 1, for example, it can be 1.2 : 1, 1.4 : 1, 1.5 : 1, 1.6 : 1, 1.8 : 1, 2 : 1 or the range composed of any two of them, which helps to further balance and improve the low-temperature resistance, normal-temperature adhesion and aging resistance of the hot-melt pressure-sensitive adhesive.

[0039] In a specific embodiment of the present invention, the mass ratio of the star-shaped styrene block copolymer to the pure monomer resin is (6 - 10) : 1, for example, it can be 6 : 1, 7 : 1, 8 : 1, 9 : 1, 10 : 1 or the range composed of any two of them, which helps to fully exert the modification effect of the pure monomer resin on the styrene end of the star-shaped styrene block copolymer and ensure the viscosity, bonding performance, etc.

[0040] In a specific embodiment of the present invention, the flame retardant is a halogen-free flame retardant. Further, the particle size of the flame retardant is ≤20 μm, and for example, it can be 20 μm, 18 μm, 15 μm, 12 μm, 10 μm or the range composed of any two of them.

[0041] In a specific embodiment of the present invention, the flame retardant includes at least one of organophosphorus-nitrogen flame retardants or metal hydroxide flame retardants.

[0042] In a specific embodiment of the present invention, the softening point of the pure monomer resin is 120 - 140 °C, and for example, it can be 120 °C, 125 °C, 130 °C, 135 °C, 140 °C or the range composed of any two of them.

[0043] In a specific embodiment of the present invention, the pure monomer resin includes at least one of poly-α-methylstyrene resin and aromatic pure monomer resin.

[0044] The second aspect of the present invention provides a preparation method of the flame-retardant hot-melt pressure-sensitive adhesive of the first aspect of the present invention, including the following steps: mixing each component in proportion.

[0045] In a specific embodiment of the present invention, the mixing includes: mixing a star-shaped styrene block copolymer, a liquid tackifying resin and an antioxidant, kneading at 160 - 180 °C for 40 - 50 min; then sequentially adding a hydrogenated tackifying resin and a flame retardant and mixing evenly, and then adding a photoinitiator, and evacuating to remove bubbles. The prepared flame-retardant hot-melt pressure-sensitive adhesive is stored in the dark.

[0046] The third aspect of the present invention provides an optical fiber cable, including an optical fiber cable body and a hot-melt pressure-sensitive adhesive layer provided on at least part of the surface of the optical fiber cable body; the hot-melt pressure-sensitive adhesive layer is made of the flame-retardant hot-melt pressure-sensitive adhesive of the first aspect of the present invention.

[0047] In a specific embodiment of the present invention, the optical fiber cable further includes a release film, and the release film is adhesively attached to one side of the hot-melt pressure-sensitive adhesive layer away from the optical fiber cable body.

[0048] In a specific embodiment of the present invention, the preparation method of the hot-melt pressure-sensitive adhesive layer includes: coating the flame-retardant hot-melt pressure-sensitive adhesive on the surface of the optical fiber cable, and then irradiating with an ultraviolet lamp. Among them, during the ultraviolet lamp irradiation, the wavelength of the ultraviolet lamp is 300 - 400 nm, and the irradiation duration is 10 - 20 s.

[0049] In a specific embodiment of the present invention, the thickness of the hot-melt pressure-sensitive adhesive layer is 300 - 400 mm.

[0050] Example 1

[0051] The present embodiment provides a flame retardant hot melt pressure sensitive adhesive, comprising the following components in parts by weight: 45 parts of star styrene block copolymer, 23 parts of hydrogenated tackifying resin, 13 parts of liquid tackifying resin, 11 parts of flame retardant, 6 parts of pure monomer resin, 1.2 parts of photoinitiator and 0.8 parts of antioxidant.

[0052] The components are as follows:

[0053] Star-shaped styrene block copolymer: Yuehua SIS YH4019;

[0054] Hydrogenated tackifying resin: Eastman C-100W;

[0055] Liquid tackifying resin: Crayville Wink-Tack 10;

[0056] Flame retardant: TZ-300T;

[0057] Pure monomer resin: SA-120;

[0058] Photoinitiator TPO;

[0059] The antioxidant includes antioxidant 1010 and antioxidant 168 in a mass ratio of 1:1.

[0060] This embodiment provides a method for preparing a flame retardant hot melt pressure sensitive adhesive, comprising the following steps:

[0061] (1) Add star-shaped styrene block copolymer, liquid tackifying resin and antioxidant into a kneader, raise the temperature to 170°C, knead for about 45 minutes to allow the polymer to melt and swell, slowly add hydrogenated tackifying resin and stir to mix evenly, then slowly add flame retardant in batches (e.g., two batches), and after the whole system becomes a uniform viscous liquid, add photoinitiator, evacuate to remove bubbles, stop heating and stirring, discharge while hot, and store away from light to obtain a flame retardant hot melt pressure-sensitive adhesive.

[0062] Example 2

[0063] This embodiment refers to the flame retardant hot melt pressure sensitive adhesive and its preparation method of embodiment 1, the only difference is that the amount of each component of the flame retardant hot melt pressure sensitive adhesive is different.

[0064] The flame retardant hot melt pressure sensitive adhesive of this embodiment includes the following components in parts by weight: 58 parts of star styrene block copolymer, 15 parts of hydrogenated tackifying resin, 10 parts of liquid tackifying resin, 10 parts of flame retardant, 5 parts of pure monomer resin, 1.2 parts of photoinitiator and 0.8 parts of antioxidant.

[0065] Example 3

[0066] This embodiment refers to the flame retardant hot melt pressure sensitive adhesive and its preparation method of embodiment 1, the only difference is that the amount of each component of the flame retardant hot melt pressure sensitive adhesive is different.

[0067] The flame-retardant hot-melt pressure-sensitive adhesive of this embodiment comprises the following components by weight parts: 40 parts of star-shaped styrene block copolymer, 15 parts of hydrogenated tackifying resin, 25 parts of liquid tackifying resin, 10 parts of flame retardant, 8 parts of pure monomer resin, 1.2 parts of photoinitiator, and 0.8 part of antioxidant.

[0068] Example 4

[0069] The flame-retardant hot-melt pressure-sensitive adhesive of this embodiment refers to that of Example 1 and its preparation method, with the difference only being that the dosages of the components of the flame-retardant hot-melt pressure-sensitive adhesive are different.

[0070] The flame-retardant hot-melt pressure-sensitive adhesive of this embodiment comprises the following components by weight parts: 45 parts of star-shaped styrene block copolymer, 20 parts of hydrogenated tackifying resin, 16 parts of liquid tackifying resin, 11 parts of flame retardant, 6 parts of pure monomer resin, 1.2 parts of photoinitiator, and 0.8 part of antioxidant.

[0071] Example 5

[0072] The flame-retardant hot-melt pressure-sensitive adhesive of this embodiment refers to that of Example 1 and its preparation method, with the difference only being that the dosages of the components of the flame-retardant hot-melt pressure-sensitive adhesive are different.

[0073] The flame-retardant hot-melt pressure-sensitive adhesive of this embodiment comprises the following components by weight parts: 45 parts of star-shaped styrene block copolymer, 25 parts of hydrogenated tackifying resin, 11 parts of liquid tackifying resin, 11 parts of flame retardant, 6 parts of pure monomer resin, 1.2 parts of photoinitiator, and 0.8 part of antioxidant.

[0074] Example 6

[0075] The flame-retardant hot-melt pressure-sensitive adhesive of this embodiment refers to that of Example 1 and its preparation method, with the difference only being that the dosages of the components of the flame-retardant hot-melt pressure-sensitive adhesive are different.

[0076] The flame-retardant hot-melt pressure-sensitive adhesive of this embodiment comprises the following components by weight parts: 43 parts of star-shaped styrene block copolymer, 23 parts of hydrogenated tackifying resin, 13 parts of liquid tackifying resin, 11 parts of flame retardant, 8 parts of pure monomer resin, 1.2 parts of photoinitiator, and 0.8 part of antioxidant.

[0077] Example 7

[0078] The flame-retardant hot-melt pressure-sensitive adhesive of this embodiment refers to that of Example 1 and its preparation method, with the difference only being that the dosage of the photoinitiator in the flame-retardant hot-melt pressure-sensitive adhesive is different.

[0079] The dosage of the photoinitiator in this embodiment is 1 part.

[0080] Example 8

[0081] This example refers to the flame-retardant hot-melt pressure-sensitive adhesive and its preparation method in Example 1, with the only difference being the dosage of the photoinitiator in the flame-retardant hot-melt pressure-sensitive adhesive.

[0082] The dosage of the photoinitiator in this example is 2 parts.

[0083] Example 9

[0084] This example refers to the flame-retardant hot-melt pressure-sensitive adhesive and its preparation method in Example 1, with the only difference being the type of liquid tackifying resin in the flame-retardant hot-melt pressure-sensitive adhesive.

[0085] The liquid tackifying resin in this example is liquid rosin resin, LR-30 from Zhejiang Xinsong Resin Co., Ltd.

[0086] Example 10

[0087] This example refers to the flame-retardant hot-melt pressure-sensitive adhesive and its preparation method in Example 1, with the only difference being the type of pure monomer resin in the flame-retardant hot-melt pressure-sensitive adhesive.

[0088] The pure monomer resin in this example is α-methylstyrene monomer resin, Kraton SA140.

[0089] Example 11

[0090] This example refers to the flame-retardant hot-melt pressure-sensitive adhesive and its preparation method in Example 1, with the only difference being the type of pure monomer resin in the flame-retardant hot-melt pressure-sensitive adhesive.

[0091] The pure monomer resin in this example is aromatic pure monomer resin, Eastman Plastolyn 290.

[0092] Comparative Example 1

[0093] Comparative Example 1 provides a hot-melt pressure-sensitive adhesive for ordinary tapes, comprising the following components in parts by weight: 18 parts of plasticizer 4010, 35 parts of styrene block copolymer 1106, 0.5 part of antioxidant 1010, 29.5 parts of petroleum resin A1100, and 17 parts of rosin resin 138A.

[0094] The preparation method includes the following steps: (1) Add the styrene block copolymer, plasticizer, and antioxidant into a reaction kettle, heat to 140 - 150 °C, and stir while evacuating to a completely molten state of the copolymer to obtain a molten material;

[0095] (2) Raise the temperature of the molten material to 150 - 160 °C, slowly add the petroleum resin and rosin resin, stir and mix evenly, evacuate to remove air bubbles, and stop heating and stirring after the whole system becomes a uniformly viscous liquid state, and discharge the material while it is hot.

[0096] Comparative Example 2

[0097] Comparative Example 2 Refer to the flame-retardant hot-melt pressure-sensitive adhesive of Example 1 and its preparation method, the difference lies in: the dosages of each component of the flame-retardant hot-melt pressure-sensitive adhesive are different.

[0098] The flame-retardant hot-melt pressure-sensitive adhesive of Comparative Example 2 comprises the following components in parts by weight: 45 parts of star-shaped styrene block copolymer, 31 parts of hydrogenated tackifying resin, 5 parts of liquid tackifying resin, 11 parts of flame retardant, 6 parts of pure monomer resin, 1.2 parts of photoinitiator and 0.8 part of antioxidant.

[0099] Comparative Example 3

[0100] Comparative Example 3 Refer to the flame-retardant hot-melt pressure-sensitive adhesive of Example 1 and its preparation method, the difference lies in: the dosages of each component of the flame-retardant hot-melt pressure-sensitive adhesive are different.

[0101] The flame-retardant hot-melt pressure-sensitive adhesive of Comparative Example 3 comprises the following components in parts by weight: 45 parts of star-shaped styrene block copolymer, 6 parts of hydrogenated tackifying resin, 30 parts of liquid tackifying resin, 11 parts of flame retardant, 6 parts of pure monomer resin, 1.2 parts of photoinitiator and 0.8 part of antioxidant.

[0102] Comparative Example 4

[0103] Comparative Example 4 Refer to the flame-retardant hot-melt pressure-sensitive adhesive of Example 1 and its preparation method, the difference lies in: using an equal weight part of linear styrene block copolymer SIS 1126 to replace the star-shaped styrene block copolymer in Example 1.

[0104] Comparative Example 5

[0105] Comparative Example 5 Refer to the flame-retardant hot-melt pressure-sensitive adhesive of Example 1 and its preparation method, the difference lies in: not adding photoinitiator.

[0106] Comparative Example 6

[0107] Comparative Example 6 Refer to the flame-retardant hot-melt pressure-sensitive adhesive of Example 1 and its preparation method, the difference lies in: the dosage of photoinitiator is different.

[0108] The dosage of the photoinitiator in Comparative Example 6 is 3 parts.

[0109] Comparative Example 7

[0110] Comparative Example 7 Refer to the flame-retardant hot-melt pressure-sensitive adhesive of Example 1 and its preparation method, the difference lies in: not adding pure monomer resin, and the pure monomer resin part is supplemented with an equal weight part of the hydrogenated tackifying resin in Example 1.

[0111] Comparative Example 8

[0112] Comparative Example 8 Refer to the flame-retardant hot-melt pressure-sensitive adhesive of Example 1 and its preparation method, the difference lies in: the dosage of pure monomer resin is 10 parts, and the dosage of hydrogenated tackifying resin is reduced to 19 parts.

[0113] Experimental Example

[0114] The hot-melt pressure-sensitive adhesives of the examples and comparative examples were placed in a hot-melt adhesive coater, directly coated on the fiber optic cable through a glue gun, irradiated with a UV lamp, and then covered with a release film and wound up. The coating thickness was controlled between 300 and 400 mm, and 3 mm×250 mm splines were made for the following tests. The test results are shown in Table 1.

[0115] (1) Adhesion at room temperature: The 90° peel strength was tested in accordance with GB / T 2792-2014;

[0116] (2) Adhesion at low temperature: The spline was pasted on a steel plate at 5°C and kept at 5°C for 24 h, and then the 90° peel strength was tested at -10°C;

[0117] (3) Adhesion at high temperature: The spline was pasted on a steel plate at room temperature (23±2°C) and kept at room temperature (23±2°C) for 24 h, and then the 90° peel strength was tested at 60°C;

[0118] (4) Creep resistance test: The spline was pasted on a steel plate at room temperature (23±2°C), the effective pasting size was 3 mm×150 mm, and a 500 g weight was hung under the fiber optic cable; it was placed in an incubator for temperature cycling test. The test conditions were: -10°C to 60°C, the extreme temperature was maintained for 8 h, and the number of cycles was 10 times. Observe the falling situation of the sample;

[0119] (5) UV resistance test: According to the ISO 4892 standard, the 90° peel strength was tested after 144 h of light irradiation.

[0120] Table 1 Test results of different hot-melt pressure-sensitive adhesives

[0121]

[0122] From the above test results, it can be seen that the flame-retardant hot-melt pressure-sensitive adhesive of the present invention has excellent adhesion performance and weather resistance, can meet the application environment requirements of fiber optic cables, and can be pre-coated on fiber optic cables. During construction, it can be directly pasted without heating and melting, and the operation is convenient.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. Flame retardant hot melt pressure sensitive adhesive, characterized in that: It includes the following components by weight: 40-60 parts of star-shaped styrene block copolymer, 15-25 parts of hydrogenated tackifying resin, 10-25 parts of liquid tackifying resin, 10-20 parts of flame retardant, 5-8 parts of pure monomer resin, 1-2 parts of photoinitiator and 0.1-1 part of antioxidant; The star-shaped styrene block copolymer is Yuehua SIS YH4019; The pure monomer resin is at least one of pure monomer resin SA-120, pure monomer resin Kraton SA140 and pure monomer resin Eastman Plastolyn 290; The liquid tackifying resin is at least one of a liquid petroleum resin Crayville Wink-tack 10 and a liquid rosin resin LR-30; The hydrogenated tackifying resin is Eastman C-100W; The flame retardant hot melt pressure sensitive adhesive does not contain a plasticizer.

2. The flame retardant hot melt pressure sensitive adhesive according to claim 1, characterized in that: The mass ratio of the hydrogenated tackifying resin to the liquid tackifying resin is (1.2-2):

1.

3. The flame retardant hot melt pressure sensitive adhesive according to claim 1, characterized in that: The mass ratio of the star-shaped styrene block copolymer to the pure monomer resin is (6-10):

1.

4. The flame retardant hot melt pressure sensitive adhesive according to claim 1, characterized in that: The flame retardant is a halogen-free flame retardant; the particle size of the flame retardant is ≤20 μm.

5. The method for preparing the flame retardant hot melt pressure sensitive adhesive according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: mixing the components in proportion.

6. An optical fiber cable, characterized in that: It comprises an optical fiber cable body and a hot melt pressure sensitive adhesive layer arranged on at least part of the surface of the optical fiber cable body; the hot melt pressure sensitive adhesive layer is made of the flame retardant hot melt pressure sensitive adhesive described in any one of claims 1 to 4 or the flame retardant hot melt pressure sensitive adhesive prepared by the preparation method described in claim 5.

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