Transparent liquid storage medium and preparation method thereof

Abstract

The invention discloses a transparent liquid storage medium and a preparation method thereof, the transparent liquid storage medium comprises a core layer and a skin layer, the core layer comprises APET master batch, the part number of the core layer is 35-50%, the skin layer comprises transparent modified PA6 master batch, and the part number of the skin layer is 50-65%; the transparency of the transparent liquid storage medium is larger than or equal to 88%. The transparent liquid storage medium is high in transparency, has an invisible effect after being put into a transparent or light-color liquid cup, is attractive, and is beneficial to diversified design of the appearance of a product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of atomization, in particular to a transparent liquid storage medium and a preparation method thereof. BACKGROUND

[0002] In the field of electronic atomizers, the mainstream on the market currently uses PA6 / PET skin-core composite fibers as liquid storage media of atomization components. However, the existing material system has certain defects. PA6 is a semi-transparent or opaque material, and PET becomes white or opaque after crystallization. The appearance feature of the liquid storage medium prepared by compounding the two has color and cannot be transparent. For transparent or light-colored liquid tank products, after the e-liquid is injected into the liquid storage medium, the liquid storage medium and the e-liquid present two obvious color perceptions, which affects the overall aesthetics of the product. In order to ensure the aesthetics, deep-colored liquid tank products are currently selected, but users cannot view the remaining e-liquid amount in the liquid tank in real time, which leads to dry burning when smoking to the end. SUMMARY

[0003] The main purpose of the present application is to provide a transparent liquid storage medium and a preparation method thereof, which solves the technical problem of low transparency of the existing transparent liquid storage medium.

[0004] To achieve the above-mentioned purpose, the first aspect of the present application provides a transparent liquid storage medium, the transparency of the transparent liquid storage medium is greater than or equal to 88%,

[0005] The transparent liquid storage medium comprises:

[0006] a core layer comprising APET masterbatch, the proportion of the core layer being 35-50%; and

[0007] a skin layer comprising transparent modified PA6 masterbatch, the proportion of the skin layer being 50-65%.

[0008] Optionally, in the transparent liquid storage medium, the proportion of the APET masterbatch is 35-50%, and the proportion of the transparent modified PA6 masterbatch is 50-65%.

[0009] Optionally, the APET comprises 80-120 parts of APET chips, 0.3-0.5 parts of an antioxidant, and 0.2-0.4 parts of calcium stearate complex fat; the antioxidant comprises 110 and / or 168.

[0010] Optionally, the APET chips have a specific viscosity of 0.7-0.8 dL / g, a density of 1.33-1.35 g / cm 3 , and a melting point of 245-255℃.

[0011] Optionally, the antioxidant comprises the 110 and the 168, and the proportion ratio of the 110 to the 168 is 0.9:1-1.1:1.

[0012] Optionally, the transparent modified PA6 comprises 80-120 parts of PA6 chips, 0.3-0.8 parts of phenyl phosphinate, 0.8-1.5 parts of sorbitol derivatives and 0.5-1.0 parts of maleic anhydride grafting.

[0013] Optionally, the PA6 chips have a density of 1.10-1.15 g / cm 3 , a melting point of 205-225℃ and a thermal decomposition temperature of greater than or equal to 300℃.

[0014] The second aspect of the present application proposes a preparation method of a transparent liquid storage medium, the preparation method of the transparent liquid storage medium comprising the steps of:

[0015] respectively melting extruding the core layer and the skin layer;

[0016] skin-core composite spinning the intermediate product after melting extrusion;

[0017] gradient cooling the intermediate product obtained by skin-core composite spinning;

[0018] stretching the intermediate product after cooling;

[0019] heat setting the intermediate product after stretching;

[0020] hot melt adhesive-free forming the intermediate product after heat setting;

[0021] The core layer comprises APET masterbatch, and the proportion of the core layer is 35-50%; the skin layer comprises transparent modified PA6 masterbatch, and the proportion of the skin layer is 50-65%.

[0022] Optionally, the core layer uses APET masterbatch, and the skin layer uses transparent modified PA6 masterbatch; in the step of respectively melting extruding the core layer and the skin layer, two screw machines are used to melt extrude the APET masterbatch and the transparent modified PA6 masterbatch respectively, the extrusion temperature of the APET masterbatch is 265-275℃, the screw rotation speed is 60-70 rpm, the melt pressure is 8-10 Mpa, and the residence time is <3 min; the extrusion temperature of the transparent modified PA6 masterbatch is 235-245℃, the screw rotation speed is 50-60 rpm, the melt pressure is 6-8 Mpa, and the residence time is <2.5 min.

[0023] Optionally, in the step of skin-core composite spinning the intermediate product after melting extrusion, the spinneret adopts a concentric circle structure, the pore size of the spinneret is 0.15-0.25 mm, the spinning temperature is 255±2℃, nitrogen protection is required during production and the oxygen content is required to be <50 ppm, and the extrusion speed of the core layer and the skin layer is 3.9:1-4.1:1.

[0024] Optionally, the step of gradient cooling the intermediate product obtained by the core-sheath composite spinning comprises the steps of:

[0025] primary cold air cooling the intermediate product obtained by the core-sheath composite spinning;

[0026] secondary water bath cooling the intermediate product obtained by the core-sheath composite spinning;

[0027] wherein the primary cold air cooling adopts a cold air ring with a temperature of 25-35℃; the secondary water bath cooling has a temperature of 10-20℃, an immersion length of >1.2m and a cooling speed of >200℃ / s.

[0028] Optionally, the step of stretching the cooled intermediate product comprises the steps of:

[0029] pre-stretching the cooled intermediate product by using hot air medium;

[0030] main stretching the cooled intermediate product by using saturated steam;

[0031] wherein the pre-stretching has a temperature of 55-75℃, a stretching speed of 140-160m / min and a stretching ratio of 1.6-2.0x; the main stretching has a temperature of 85-95℃, a stretching speed of 340-360m / min and a stretching ratio of 3.3-3.7x.

[0032] Optionally, in the step of heat setting the stretched intermediate product, heat roller setting is adopted, the heat setting has a temperature of 115-130℃ and a setting speed of 280-320m / min.

[0033] Optionally, the step of hot melt adhesive-free bonding forming the heat set intermediate product adopts hot melt adhesive-free bonding technology, and the step of hot melt adhesive-free bonding forming the heat set intermediate product comprises the steps of:

[0034] sending the heat set intermediate product into a multi-channel constant temperature furnace by a first traction machine for hot melt bonding and interlacing reinforcement forming;

[0035] pulling out the formed product to a multi-channel cutting machine by a second traction machine;

[0036] cutting the formed product into samples with a desired length by the multi-channel cutting machine;

[0037] The multi-passage constant-temperature furnace comprises a first temperature zone, a second temperature zone, a third temperature zone and a fourth temperature zone, wherein the temperature of the first temperature zone is 145-155 DEG C, the temperature of the second temperature zone is 165-185 DEG C, the temperature of the third temperature zone is 185-195 DEG C, and the temperature of the fourth temperature zone is 195-205 DEG C; the feeding speed of the first traction machine is 1.0-1.5 m / s; and the discharging speed of the second traction machine is 0.5-0.9 m / s.

[0038] Optionally, before the step of separately melt-extruding the core layer and the skin layer, the preparation method of the transparent liquid storage medium comprises the steps of:

[0039] The APET master batch and the transparent modified PA6 master batch are vacuum dried.

[0040] The drying temperature of the APET master batch is 110-150 DEG C, the drying time is 3-5 hours, the vacuum pressure is ≤-0.095 Mpa, and the water content after drying is ≤50 ppm; the drying temperature of the transparent modified PA6 master batch is 80-90 DEG C, the drying time is 15-18 hours, and the water content after drying is ≤100 ppm.

[0041] Optionally, before the step of vacuum drying the APET master batch and the transparent modified PA6 master batch, the preparation method of the transparent liquid storage medium comprises the steps of:

[0042] The APET master batch is prepared.

[0043] And / or, the transparent modified PA6 master batch is prepared.

[0044] Optionally, the preparation of the APET master batch comprises the steps of:

[0045] The raw materials are selected;

[0046] The raw materials are pre-mixed;

[0047] The mixed raw materials are subjected to double-screw extrusion;

[0048] The extruded raw materials are subjected to air cooling and granulation.

[0049] Optionally, the transparent modified PA6 master batch comprises the steps of:

[0050] The raw materials are selected;

[0051] The raw materials are pre-mixed;

[0052] The mixed raw materials are subjected to double-screw extrusion;

[0053] The extruded raw materials are subjected to water cooling and granulation.

[0054] The transparency of the transparent liquid storage medium is greater than or equal to 88%, the transparent liquid storage medium has a "invisible" effect when being filled into a transparent or light-colored liquid cup, is more beautiful, and is beneficial to diversified design of product appearance. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application are described below clearly and completely. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0056] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0057] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" throughout the text includes three solutions, for example, A and / or B includes A technical solution, B technical solution, and A and B simultaneously meet the technical solution; in addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0058] The present application provides a kind of transparent liquid storage medium. Transparent liquid storage medium can be applied in electronic atomizer, and transparent liquid storage medium can store atomization matrix and provide atomization matrix to atomization component of electronic atomizer. The transparency of the transparent liquid storage medium of the present application is greater than or equal to 88% (the average value of detection of multiple samples), and has a "invisible" effect when being filled into a transparent or light-colored liquid cup, is more beautiful, and is beneficial to diversified design of product appearance.

[0059] The transparent liquid storage medium of the present application adopts the composite structure of "core layer + skin layer", and realizes function synergy through layered design. The core layer is used for focusing liquid storage and liquid preservation, and the skin layer is used for protection, barrier and controlled release, etc. In the transparent liquid storage medium of the present application, the core layer includes APET master batch, and the proportion of the core layer is 35-50%. The skin layer includes transparent modified PA6 master batch, and the proportion of the skin layer is 50-65%.

[0060] Amorphous polyethylene terephthalate (APET) is a degradable plastic, which has excellent physical and mechanical properties in a wide temperature range, and transparency > 90% (2mm thickness). APET destroys the molecular chain regularity by copolymerization modification to form a completely amorphous structure, with glass-like transparency and gloss. APET has excellent chemical resistance, grease resistance and low temperature toughness (-40℃ without brittle fracture), and tensile strength > 60Mpa.

[0061] In the transparent storage medium of the present application, the core layer can only use APET master batch, that is, the proportion of APET master batch in the transparent storage medium is 35-50%. Further, the proportion of APET master batch can be 40-50%, 45-50%, 35-45%, 42-48% or 38-43%, etc. Further, the proportion of APET can be about 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50% or any value between any two adjacent values in the above.

[0062] The APET master batch can include 80-120 parts of APET chips, 0.3-0.5 parts of antioxidant and 0.2-0.4 parts of calcium stearate complex fat. Further, the proportion of APET chips can be 85-110, 95-105, 90-100 or 99-115. Further, the proportion of APET chips can be about 80, 83, 85, 87, 90, 92, 95, 97, 98, 99, 100, 101, 102, 105, 107, 110, 112, 115, 117 or 120. The intrinsic viscosity of the APET chips is 0.7-0.8dL / g, the density is 1.33-1.35g / cm 3 , and the melting point is 245-255℃.

[0063] The antioxidant includes tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester and tris(2,4-di-tert-butylphenyl) phosphate. Tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester is referred to as 1010, and tris(2,4-di-tert-butylphenyl) phosphate is referred to as 168. 1010 acts as a primary antioxidant to capture free radicals, and 168 acts as a secondary antioxidant to decompose hydroperoxide, and the two are used in combination to extend the thermal aging life of the polymer.

[0064] 1010 is a hindered phenolic antioxidant, which contains 4 phenolic hydroxyl groups (-OH) in its molecular structure, and the ortho position is protected by di-t-butyl (-C(CH3)3), which not only ensures the reactivity, but also improves the thermal stability. When APET is oxidized at high temperature to produce free radicals (R·, ROO·), the phenolic hydroxyl group of 1010 will release hydrogen atoms (H·), combine with free radicals to form stable molecules, and interrupt the oxidation chain reaction. The decomposition temperature of 1010 is as high as 260℃, which is suitable for high-temperature processing and is not easy to volatilize or decompose. 1010 has good compatibility with APET and will not cause the material to yellow, which is suitable for white or light-colored products. 168 belongs to the phosphite antioxidant, which can efficiently decompose the hydroperoxide (ROOH) produced in the polymer oxidation process, avoid its further decomposition into active free radicals (RO·, HO·), and thus assist the main antioxidant to play a role. 168 is suitable for high-temperature extrusion and can inhibit the "degradation yellowing" during processing. 168 has good compatibility with APET and has no risk of blooming. When 168 is compounded with 1010, the antioxidant efficiency is not simply additive, but through the synergistic mechanism of "capturing free radicals + decomposing hydroperoxide", the oxidation induction period of APET is prolonged.

[0065] The ratio of 110 to 168 can be 0.9:1-1.1:1, so that the synergistic effect of the two is better. Preferably, the ratio of 1010 to 168 is 1:1.

[0066] Calcium stearate complex lipid as an internal lubricant, through compounding with other ingredients, realizes the multiple goals of lubrication, stability and function improvement in processing. The long-chain fatty acid group of calcium stearate is embedded between the polymer molecular chains, reducing the intermolecular friction and making the melt viscosity decrease. Calcium stearate complex lipid can form an isolation layer at the metal-polymer interface, reducing adhesion. Calcium stearate complex lipid can delay thermal aging, prolonging the processing yellowing. Calcium stearate complex lipid can improve the dispersibility of fillers in polymers and improve the impact strength of composites. Calcium stearate complex lipid has good compatibility with APET and has no risk of blooming.

[0067] The skin layer can only use transparent modified PA6 master batch, that is, the transparent storage medium in the present application, and the proportion of the transparent modified PA6 master batch is 50-65%. Further, the proportion of the transparent modified PA6 master batch can be 50-60%, 55-60%, 55-65%, 52-58%, or 58-63%, etc. Further, the proportion of the transparent modified PA6 master batch can be about 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, or any value between any two adjacent values in the above.

[0068] The transparent modified PA6 master batch can include 80-120 parts of PA6 chips, 0.3-0.8 parts of phenyl phosphinate, 0.8-1.5 parts of sorbitol derivatives, and 5-1.0 parts of maleic anhydride grafting. Further, the parts of PA6 chips can be 85-110, 95-105, 90-102, or 99-110. Further, the parts of PA6 chips can be about 80, 83, 85, 87, 90, 92, 95, 97, 98, 99, 100, 101, 102, 105, 107, 110, 112, 115, 117, or 120. The density of the transparent modified PA6 chips is 1.10-1.15 g / cm 3 , the melting point is 205-225℃, and the thermal decomposition temperature is greater than or equal to 300℃.

[0069] The phenyl phosphinate can be flame-retardant, and the initial decomposition temperature is above 350℃, which is much higher than the processing temperature of PA6, and can ensure that it does not decompose prematurely during high-temperature processing. When the phenyl phosphinate is decomposed by heat, phosphoric acid and phosphonic acid are generated, which catalyze the formation of a dense carbon layer on the surface of the polymer, and can block the transmission of oxygen and heat. The sorbitol derivative acts as a transparency agent, refines the crystal structure of PA6 through heterogeneous nucleation effect, and reduces light scattering, thereby improving transparency. The sorbitol derivative self-assembles into a nanofiber network structure through hydrogen bonding in the PA6 melt, providing a high-density heterogeneous nucleation site for PA6, promoting the formation of smaller and more uniformly distributed spherocrystals, and thus reducing light scattering. This refined crystal structure improves the transparency of PA6. The maleic anhydride grafting acts as a compatibilizer, which can improve the interfacial bonding strength between PA6 and APET during the preparation of the PA6-APET blend, enhance the tensile strength of the composite fibers, and avoid delamination or skinning caused by long-term storage.

[0070] The application also provides a preparation method of the transparent storage medium, which includes the step of blending the core layer and the skin layer to prepare the product. The APET master batch and the transparent modified PA6 master batch can be purchased on the market. In the preparation method of the transparent storage medium of the application, the steps of preparing the APET master batch and / or the transparent modified PA6 master batch can also be included.

[0071] The preparation method of the storage medium of the application is described in detail below.

[0072] In an embodiment, the preparation of the APET master batch includes the steps of:

[0073] S110, selecting raw materials. APET chips with a density of 1.10-1.15 g / cm 3 , a melting point of 205-225℃, and a thermal decomposition temperature of greater than or equal to 300℃ are used.

[0074] S120, pre-mixing the raw materials. The rotation speed of the mixer is set to 800-1000 rpm, and the total stirring time is 7-9 min. 80-120 parts of APET chips are put in, followed by 0.3-0.5 parts of antioxidant (1010 and 168 are compounded at 0.9:1-1.1:1), mixed for 2-4 min, then 0.2-0.4 parts of calcium stearate composite fat is added, and mixed for another 3-5 min.

[0075] S130, double-screw extruding the mixed raw materials. The setting temperature of the screw feeding section is 240-260℃, the setting temperature of the melting section is 255-275℃, the setting temperature of the mixing section is 260-275℃, the vacuum degree of the vacuum devolatilization section is ≤-0.05 MPa, the temperature of the die head is set to 255-275℃, the rotation speed of the screw is 200-300 rpm, and the residence time of the whole process is 1 min-1.5 min.

[0076] S140, air-cooling and pelletizing the extruded raw materials. The air-cooling process is adopted, the cold air temperature is controlled at 22-28℃, the speed of the conveying belt is 14-16 m / min, and the cutter gap of the pelletizing process is controlled at 0.05-0.10 mm.

[0077] S150, drying the pelletized raw materials. The prepared APET masterbatch is dried in a fluidized bed at 70-90℃ for 2-3 hours.

[0078] The preparation of the transparent modified PA6 masterbatch includes the following steps:

[0079] S210, selecting raw materials. PA6 chips with a density of 1.10-1.15 g / cm 3 , a melting point of 205-225℃, and a thermal decomposition temperature of greater than or equal to 300℃ are selected.

[0080] S220, pre-mixing the raw materials. The rotation speed of the high-speed mixer is set to 800-1200 rpm, and the stirring ambient temperature is <40℃. 80-120 parts of PA6 chips are put in and stirred for 20-40 s, then 0.3-0.8 parts of transparent nucleating agent phenyl phosphinate (TMB-5), 0.8-1.5 parts of transparent agent sorbitol derivative (NX 8000) are added and stirred for 80-100 s, and finally 0.5-1.0 parts of compatibilizer maleic anhydride grafting is added and stirred for 60-100 s.

[0081]

[0082] ​S230, double screw extrusion is performed on the mixed raw materials. The rotation speed of the screw is set to 200-300 rpm, the vacuum degree is -0.08 MPa, and the melt extrusion is divided into 7 temperature zones. The temperature of the feeding zone (I zone) is set to 210-220°C, and the feeding zone (I zone) is used for preheating the raw materials. The temperature of the melting zone (II-IV zone) is set to 230-240°C, and the melting zone (II-IV zone) is used for PA6 melting and additive dispersion. The temperature of the mixing zone (V-VI zone) is set to 235-245°C, and the mixing zone (V-VI zone) is used for forced shear refinement of the crystal nucleus. The temperature of the die zone (VII zone) is set to 240-245°C, and the die zone (VII zone) is used for homogenizing the melt and preventing degradation. The residence time of the whole process is 1.5-2.5 min.

[0083] S240, water cooling and granulation are performed on the extruded raw materials. The underwater hot cutting process is adopted, and the water temperature is controlled at 40-50°C to obtain transparent modified PA6 masterbatch.

[0084] The steps of preparing the product by blending the core layer and the skin layer include:

[0085] S310, vacuum drying is performed on the APET masterbatch and the transparent modified PA6 masterbatch. The drying temperature of the APET masterbatch is 110-150°C, the drying time is 3-5 hours, the vacuum pressure is ≤-0.095 MPa, and the water content after drying is ≤50 ppm. The drying temperature of the transparent modified PA6 masterbatch is 80-90°C, the drying time is 15-18 hours, and the water content after drying is ≤100 ppm.

[0086] S320, melt extrusion is performed on the core layer and the skin layer respectively. The proportion of the APET masterbatch is 35-50%, and the proportion of the transparent modified PA6 masterbatch is 50-65. Two screw machines are used to melt extrude the core layer and the skin layer respectively. The extrusion temperature of the core layer is 265-275°C, the screw rotation speed is 60-70 rpm, the melt pressure is 8-10 MPa, and the residence time is <3 min. The extrusion temperature of the skin layer is 235-245°C, the screw rotation speed is 50-60 rpm, the melt pressure is 6-8 MPa, and the residence time is <2.5 min.

[0087] S330, skin-core composite spinning is performed on the intermediate product after melt extrusion. In the step of performing skin-core composite spinning on the intermediate product after melt extrusion, the spinneret adopts concentric circle structure, the hole diameter of the spinneret is 0.15-0.25 mm, the spinning temperature is 255±2°C, the production process needs nitrogen protection and requires oxygen <50 ppm, and the extrusion speed of the core layer and the skin layer (i.e. the APET masterbatch and the transparent modified PA6 masterbatch) is 3.9:1-4.1:1.

[0088] S340, gradient cooling the intermediate product obtained by the core-sheath composite spinning. S340 comprises steps of: S341, primary cold air cooling the intermediate product obtained by the core-sheath composite spinning; S342, secondary water bath cooling the intermediate product obtained by the core-sheath composite spinning. The primary cold air cooling adopts a cold air ring with a temperature of 25-35℃; the secondary water bath cooling has a temperature of 10-20℃, an immersion length of >1.2m and a cooling speed of >200℃ / s.

[0089] S350, stretching the cooled intermediate product. S350 comprises steps of: S351, pre-stretching the cooled intermediate product by using hot air medium; S352, main stretching the cooled intermediate product by using saturated steam. The pre-stretching has a temperature of 55-75℃, a stretching speed of 140-160m / min and a stretching ratio of 1.6-2.0x; the main stretching has a temperature of 85-95℃, a stretching speed of 340-360m / min and a stretching ratio of 3.3-3.7x.

[0090] S360, heat setting the stretched intermediate product. Hot roller setting is adopted, and the heat setting has a temperature of 115-130℃ and a setting speed of 280-320m / min.

[0091] S370, hot melt adhesive-free bonding forming the heat set intermediate product. S370 adopts hot melt adhesive-free bonding technology, comprising steps of: S371, sending the heat set intermediate product into a multi-channel constant temperature furnace by a first traction machine for hot melt holding and interlacing reinforcement forming; S372, pulling out the formed product to a multi-channel cutting machine by a second traction machine; S373, cutting the formed product into samples with a desired length by the multi-channel cutting machine. The multi-channel constant temperature furnace comprises a first temperature zone, a second temperature zone, a third temperature zone and a fourth temperature zone. The first temperature zone has a temperature of 145-155℃, the second temperature zone has a temperature of 165-185℃, the third temperature zone has a temperature of 185-195℃, and the fourth temperature zone has a temperature of 195-205℃. The first traction machine has a feeding speed of 1.0-1.5m / s; the second traction machine has a discharging speed of 0.5-0.9m / s.

[0092] The present application further detects and compares the differences in oil guiding rate, oil locking capacity, elastic modulus and transparency between the existing liquid storage medium (comparative example) and the liquid storage medium of the present application (Examples 1-9), which are shown in Table 1 and Table 2.

[0093] Table 1 Formula composition of different examples

[0094]

[0095]

[0096] Table 2: Test results of existing reservoir medium and reservoir medium of the present application

[0097] Group Transparency (%) Oil-bleeding rate (mm / s) Oil-locking capacity (g / g) Elastic modulus (GPa) Comparative Example 55 0.10 0.80 2.5 Example 1 92 0.12 0.85 2.8 Example 2 90 0.14 0.82 2.9 Example 3 88 0.16 0.80 3.0 Example 4 88 0.10 0.88 2.5 Example 5 86 0.12 0.85 2.6 Example 6 84 0.14 0.83 2.7 Example 7 82 0.08 0.92 2.0 Example 8 80 0.10 0.90 2.2 Example 9 78 0.12 0.88 2.3

[0098] From the above results, it can be seen that the oil guiding rate, oil locking ability and elastic modulus of the transparent reservoir medium of the present application are not much different from those of the existing reservoir medium, but the transparent reservoir medium of the present application has high transparency.

[0099] The above description is merely preferred embodiments of the present application, and is not intended to limit the patent scope of the present application.

Claims

1. A transparent reservoir medium, characterized in that, The transparency of the transparent liquid storage medium is greater than or equal to 88%, and the transparent liquid storage medium comprises: a core layer comprising APET masterbatch, the proportion of the core layer being 35-50%; and a skin layer comprising transparent modified PA6 masterbatch, the proportion of the skin layer being 50-65%.

2. The transparent reservoir medium according to claim 1, characterized in that In the transparent liquid storage medium, the proportion of the APET masterbatch is 35-50%, and the proportion of the transparent modified PA6 masterbatch is 50-65%.

3. The transparent reservoir medium of claim 1, wherein, The APET masterbatch comprises 80-120 parts of APET chips, 0.3-0.5 parts of an antioxidant, and 0.2-0.4 parts of calcium stearate complex fat; the antioxidant comprises 110 and / or 168.

4. The transparent reservoir medium according to claim 3, characterized in that The APET sheet has an intrinsic viscosity of 0.7-0.8 dL / g, a density of 1.33-1.35 g / cm 3 and a melting point of 245-255°C.

5. The transparent reservoir medium of claim 3, wherein, The antioxidant comprises the 110 and the 168, and the proportion ratio of the 110 and the 168 is 0.9:1-1.1:

1.

6. The transparent reservoir medium of claim 1, wherein, The transparent modified PA6 masterbatch comprises 80-120 parts of PA6 chips, 0.3-0.8 parts of a phenyl phosphinate, 0.8-1.5 parts of a sorbitol derivative, and 0.5-1.0 parts of a maleic anhydride graft.

7. The transparent reservoir medium according to claim 6, characterized in that The PA6 chips have a density of 1.10 to 1.15 g / cm 3 a melting point of 205 to 225 °C and a thermal decomposition temperature of greater than or equal to 300 °C.

8. A method for the preparation of a transparent reservoir medium, characterized in that The preparation method of the transparent liquid storage medium comprises the steps of: respectively melt-extruding the core layer and the skin layer; core-skin composite spinning the intermediate product after melt-extrusion; gradient cooling the intermediate product obtained by core-skin composite spinning; stretching the cooled intermediate product; heat setting the stretched intermediate product; hot melt glue-free bonding and molding the heat set intermediate product; The core layer comprises APET masterbatch, and the proportion of the core layer is 35-50%; the skin layer comprises transparent modified PA6 masterbatch, and the proportion of the skin layer is 50-65%.

9. The method of claim 8, wherein the transparent liquid storage medium is prepared by adding the water-soluble polymer to the water. The core layer adopts APET masterbatch, and the skin layer adopts transparent modified PA6 masterbatch; in the step of respectively melt-extruding the core layer and the skin layer, two screw machines are used to melt-extrude the APET masterbatch and the transparent modified PA6 masterbatch respectively, the extrusion temperature of the APET masterbatch is 265-275℃, the screw rotation speed is 60-70rpm, the melt pressure is 8-10Mpa, and the residence time is <3min; the extrusion temperature of the transparent modified PA6 masterbatch is 235-245℃, the screw rotation speed is 50-60rpm, the melt pressure is 6-8Mpa, and the residence time is <2.5min.

10. The method of claim 8, wherein the transparent liquid storage medium is prepared by adding the water-soluble polymer to the water. In the step of core-skin composite spinning the intermediate product after melt-extrusion, the spinneret adopts a concentric circle structure, the hole diameter of the spinneret is 0.15-0.25mm, the spinning temperature is 255±2℃, the production process needs nitrogen protection and requires oxygen <50ppm, and the extrusion speed of the core layer and the skin layer is 3.9:1-4.1:

1.

11. The method of claim 8, wherein the transparent liquid storage medium is prepared by adding the water-soluble polymer to the water. The gradient cooling of the intermediate product obtained by core-skin composite spinning comprises the steps of: primary cold air cooling the intermediate product obtained by core-skin composite spinning; secondary water bath cooling the intermediate product obtained by core-skin composite spinning; The primary cold air cooling adopts a cold air ring with a temperature of 25-35℃; the secondary water bath cooling has a temperature of 10-20℃, an immersion length of >1.2m, and a cooling speed of >200℃ / s.

12. The method of claim 8, wherein the transparent liquid storage medium is prepared by adding the water-soluble polymer to the water. The stretching of the cooled intermediate product comprises the steps of: The intermediate product after cooling is pre-stretched by hot air medium; The intermediate product after cooling is main-stretched by saturated steam; The pre-stretching temperature is 55-75℃, the stretching speed is 140-160m / min, and the stretching ratio is 1.6-2.0x; the main-stretching temperature is 85-95℃, the stretching speed is 340-360m / min, and the stretching ratio is 3.3-3.7x.

13. The method for preparing a transparent liquid storage medium according to claim 8, characterized in that, In the step of heat setting the stretched intermediate product, heat roller setting is adopted, the heat setting temperature is 115-130℃, and the setting speed is 280-320m / min.

14. The method for preparing a transparent liquid storage medium according to claim 8, characterized in that, The hot melt adhesive-free bonding of the heat set intermediate product adopts hot melt adhesive-free bonding technology, and the hot melt adhesive-free bonding of the heat set intermediate product includes the steps of: The heat set intermediate product is sent into a multi-channel constant temperature furnace by a first traction machine for hot melt bonding and interlacing reinforcement forming; The formed product is pulled out to a multi-channel cutting machine by a second traction machine; The formed product is cut into samples of the required length by the multi-channel cutting machine; The multi-channel constant temperature furnace includes a first temperature zone, a second temperature zone, a third temperature zone, and a fourth temperature zone, the temperature of the first temperature zone is 145-155℃, the temperature of the second temperature zone is 165-185℃, the temperature of the third temperature zone is 185-195℃, and the temperature of the fourth temperature zone is 195-205℃; the feeding speed of the first traction machine is 1.0-1.5m / s; and the discharging speed of the second traction machine is 0.5-0.9m / s.

15. The method for preparing a transparent liquid storage medium according to claim 8, characterized in that, Before the step of melt-extruding the core layer and the skin layer respectively, the preparation method of the transparent liquid storage medium includes the steps of: The APET master batch and the transparent modified PA6 master batch are vacuum dried; The drying temperature of the APET master batch is 110-150℃, the drying time is 3-5 hours, the vacuum pressure is ≤-0.095Mpa, and the water content after drying is ≤50ppm; the drying temperature of the transparent modified PA6 master batch is 80-90℃, the drying time is 15-18 hours, and the water content after drying is ≤100ppm.

16. The method for preparing the transparent liquid storage medium according to claim 15, characterized in that, Before the step of vacuum drying the APET master batch and the transparent modified PA6 master batch, the preparation method of the transparent liquid storage medium includes the steps of: The APET master batch is prepared; And / or, the transparent modified PA6 master batch is prepared.

Images