Direct oiling fdy oiling agent, preparation method and spinning device

Abstract

The present application provides a kind of crude oil directly oilable FDY oil agent, preparation method and spinning device, the crude oil directly oilable FDY oil agent includes the following weight parts ingredients: composite smoothing agent 58-62 parts, emulsifier 16-20 parts, antistatic agent 5-9 parts, penetrating agent 3-7 parts, deionized water 6-10 parts, the antistatic agent is tributylhexylammonium bis (pentafluoroethane sulfonate) imine.The crude oil directly oilable FDY oil agent, preparation method and spinning device of the present application select tributylhexylammonium bis (pentafluoroethane sulfonate) imine as antistatic agent, realize the high efficiency, stable antistatic of spinning oil agent in full humidity range, especially suitable for the industrial scene (such as northern winter dry workshop) that constant temperature and humidity requirement is not strict, solve the quality unstable problem caused by humidity fluctuation of traditional antistatic agent.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spinning technology, in particular to a FDY oil agent capable of directly applying oil to crude oil, a preparation method and a spinning device. BACKGROUND

[0002] FDY (fully drawn yarn) is a kind of synthetic fiber filament produced by high-speed spinning-drawing one-step process, which is characterized by completing 100% sufficient heat stretching online in the continuous production process from the extrusion of the spinneret to the winding into a bobbin. It is an important form of finished yarn among polyester (PET), nylon (PA) and other synthetic fiber filaments. FDY oil agent is an essential additive in the spinning-drawing one-step process, which can ensure that the fiber has good smoothness, bundling and antistatic properties, so that the spinning can proceed smoothly and the spun filament can meet the requirements of subsequent processing.

[0003] Currently, the FDY oil agent is mainly in the form of emulsion. In use, as the water evaporates, the oil film is easily damaged, which leads to the rupture of the oil film on the fiber surface and ultimately causes uneven oil application, seriously affecting the quality of the fiber. The crude oil type oil agent itself contains very little water, which can better avoid the above problems. However, due to the significant reduction in water content, the antistatic property of the oil agent is inevitably affected, resulting in static electricity, which causes the yarn to be loose and difficult to wind, and further causes hairiness, broken ends and other phenomena, affecting the spinnability of the fiber.

[0004] Therefore, the Chinese patent with application number 202510330266.0 discloses a high-antistatic crude oil type polyester FDY spinning oil agent and a preparation method thereof. By using lauryl polyoxyethylene ether sodium sulfate and lauryl alcohol phosphate potassium salt composition as the main antistatic agent, and using sulfonated chitosan and PEG800 as the key components of the antistatic type smoothing agent, the antistatic type smoothing agent and the main antistatic agent synergistically enhance the overall antistatic property of the oil agent. Although the above scheme can directly apply oil to the polyester FDY spinning in the form of crude oil, the low water content makes the antistatic ability more susceptible to the influence of the surrounding atmospheric humidity and lacks durability. In addition, due to the high use amount of polyol fatty acid esters, the FDY oil agent is prone to solidification or delamination at low temperatures, which is particularly prominent in environments with significant seasonal temperature changes.

[0005] In view of the above, the present application is proposed. SUMMARY

[0006] The problem solved by the present application is that the low or no water content of the existing crude oil oiling type FDY oil agent makes its antistatic property susceptible to the influence of the environmental humidity, especially in dry environments.

[0007] To solve the above problems, the present application provides a kind of FDY oil agent that can be directly oiled with crude oil, comprising the following components by weight: composite smoothing agent 58-62 parts, emulsifier 16-20 parts, antistatic agent 5-9 parts, penetrating agent 3-7 parts, deionized water 6-10 parts, the antistatic agent is tributylhexylammonium bis (pentafluoroethane sulfonate) imide.

[0008] As an example of the present application, the tributylhexylammonium bis (pentafluoroethane sulfonate) imide is prepared by the following method: S1, dissolve tributylhexylammonium bromide (80.2 g) in 400 mL acetonitrile, stir at 25℃ until clear; under nitrogen protection, slowly add lithium bis (pentafluoroethane sulfonate) imide (110.0 g), control the temperature ≤30℃; S2, react at 60℃ for 6h, cool the reaction liquid to room temperature, filter to remove the generated lithium bromide precipitate, wash the filter cake with 100 mL acetone, and combine the filtrate; S3, transfer the filtrate to a separatory funnel, add 200 mL 0.5M NaHCO3, shake for 5min, stand to separate the layers, collect the upper organic phase, repeat the water washing operation once, then add 400 mL dichloromethane to the organic phase, wash with 100 mL saturated brine once; add 50 g anhydrous magnesium sulfate to the organic phase, stir for 4h, remove the drying agent, concentrate at 40℃, 20kpa for 2h, place in a vacuum drying oven at 35℃, 0.1kPa for 48 hours, and it is obtained.

[0009] Preferably, the composite smoothing agent is composed of glyceryl palmitate, polyglyceryl-6 oleate and pentaerythritol-4EO-triisostearate in a mass ratio of 30-40:10-15:8-12.

[0010] Preferably, it is composed of the following components by weight: composite smoothing agent 59.5-60.8 parts, emulsifier 17.5-18.5 parts, antistatic agent 6-8.4 parts, penetrating agent 3.8-6.0 parts, deionized water 8-10 parts, wherein the composite smoothing agent is composed of glyceryl palmitate, polyglyceryl-6 oleate and pentaerythritol-4EO-triisostearate in a mass ratio of 35.1-39.2:12.2-14.9:9.5-10.8.

[0011] Preferably, the penetrating agent includes at least one of isooctanol polyoxyethylene ether-6, polyether siloxane, C4 alcohol block polyether.

[0012] Preferably, the emulsifier includes at least one of polyoxyethylene sorbitan monooleate, octylphenol polyoxyethylene ether, polyoxyethylene glycerol monostearate, lauryl acid polyoxyethylene ether, polyoxyethylene castor oil, oleic acid polyoxyethylene ester, sorbitan fatty acid ester, polyethylene glycol fatty acid ester.

[0013] The application further provides a preparation method of the FDY oiling agent capable of directly oiling crude oil, comprising the following steps: S1, heating smooth agents A, B and C to 68-75 DEG C and then mixing and stirring at 500-900 rpm for 30-60 min; S2, then adding an antistatic agent and an emulsifier B and stirring at 250-400 rpm for 20-50 min, slowly adding deionized water at 65-75 DEG C and a penetrating agent and stirring at 2500-3200 rpm for 10-50 min, and then adding an emulsifier A and shearing and emulsifying at a speed of 2500-3500 rpm for 15-50 min; S3, cooling to room temperature, adjusting the pH to 6.5-7.5, and obtaining the product.

[0014] Preferably, the preparation method further comprises the following steps: S4, filling nitrogen at a flow rate of 20-40 L / min, increasing the pressure to 0.25-0.35 MPa and keeping the pressure for 2-4 min, then slowly opening the exhaust valve to release the pressure to normal pressure, and then repeating the operation 1-3 times; S5, increasing the temperature to 38-45 DEG C and starting a vacuum pump, slowly reducing the pressure to 9-12 kPa at a rate of 1.8-2.2 kPa / min, controlling the stirring speed to be 48-55 rpm, then increasing the temperature to 58-65 DEG C, reducing the vacuum pressure to 6.8-7.5 kPa at a rate of 2.9-3.2 kPa / min, controlling the stirring speed to be 80-120 rpm for 15-30 min, reducing to room temperature and opening the inlet valve to restore to normal pressure, and obtaining the product.

[0015] As an example of the application, the preparation method further comprises the following steps: filling nitrogen at a flow rate of 30 L / min, increasing the pressure to 0.3 MPa and keeping the pressure for 3 min, then slowly opening the exhaust valve to release the pressure to normal pressure, and then repeating the operation 2 times; S5, increasing the temperature to 40 DEG C and starting a vacuum pump, slowly reducing the pressure to 10 kPa at a rate of 2 kPa / min, controlling the stirring speed to be 50 rpm, then increasing the temperature to 60 DEG C, reducing the vacuum pressure to 7 kPa at a rate of 3 kPa / min, controlling the stirring speed to be 100 rpm for 20 min, reducing to room temperature and opening the inlet valve to restore to normal pressure, and obtaining the product.

[0016] The application further provides a spinning device comprising an oil agent guide for coating the above-mentioned FDY oiling agent capable of directly oiling crude oil on a plurality of single fibers or yarns formed by single fibers.

[0017] Preferably, the oil guide includes a connected main body and an oil supply section. The main body includes a contact surface, and the contact surface is sequentially provided with an oil outlet, a second groove, and a first groove from the upstream end to the downstream section. An oil delivery channel is provided in the oil supply section, and the inlet end of the oil delivery channel is connected to a pump assembly for delivering oil to the oil outlet. The first groove and the second groove extend along the width direction of the contact surface. There are multiple second grooves arranged sequentially along the length direction of the contact surface. There are two first grooves arranged at intervals. The depth and width of a single second groove are smaller than those of a single first groove.

[0018] Preferably, the main body has a first sidewall and a second sidewall that are generally triangular and opposite to each other, and a limiting passage for the yarn to pass through from top to bottom is formed between the first sidewall and the second sidewall. Compared with the prior art, the FDY oiling agent, preparation method and production device for direct oiling of crude oil described in the embodiments of the present invention have the following beneficial effects: 1) The present invention selects tributylhexylammonium bis(pentafluoroethanesulfonyl)imide as an antistatic agent to achieve efficient and stable antistatic properties of the spinning oiling agent in the full humidity range, which is especially suitable for industrial scenarios where constant temperature and humidity requirements are not strict (such as dry workshops in northern winters), and solves the problem of unstable quality caused by humidity fluctuations in traditional antistatic agents; 2) Palmitoleic acid glyceride, polyglycerol-6 oleate and pentaerythritol-4EO-triisostearate are compounded as a composite smoothing agent. The agent enables FDY oil to have good emulsification stability at low temperatures, effectively solving the problem of poor emulsification stability caused by seasonal temperature fluctuations; 3) By performing nitrogen replacement, depressurization, and heating operations on the spinning oil, the amount of dissolved gas components in the oil can be reduced, effectively preventing operational problems such as yarn breakage caused by air bubbles in the supply system when supplying oil to fiber yarn, as well as quality problems caused by uneven oil adhesion; 4) By optimizing the structure of the oil guide, the influence of fiber quantity on oiling uniformity is reduced, further reducing the occurrence of yarn breakage in production. Attached Figure Description

[0019] Figure 1 This is a front view of the oil guide device according to an embodiment of the present invention;

[0020] Figure 2 This is a vertical cross-sectional view of the AA side of the oil guide device according to an embodiment of the present invention;

[0021] Figure 3 This is a top view of the oil guide device according to an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached drawings: 1-Main body; 11-Contact surface; 101-First curved part; 1011-Oil outlet; 102-Second curved part; 1021-First groove; 1022-Second groove; 2-Oil supply part; 21-Oil delivery channel; 3-First side wall; 4-Second side wall; 5-Limiting passage. Detailed Implementation

[0023] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described in detail below. Without conflict, the technical features of the embodiments of the present invention can be combined with each other.

[0024] As the chemical fiber industry gradually transforms towards green manufacturing, FDY oiling agents applied directly from crude oil have attracted widespread attention due to their advantages such as significantly reducing energy consumption, improving quality control, and simplifying production processes. However, the low water content of current FDY oiling agents makes their antistatic properties more susceptible to changes in ambient humidity, leading to fluctuations in the final product quality. Furthermore, when the ambient temperature is below 10℃, such as in northern winters, high-melting-point components in the FDY oiling agent, such as fatty acid esters and PEGs, are prone to crystallization, resulting in solidification or delamination. This makes it difficult for the final FDY oiling agent to adhere evenly to the yarn during spinning, easily inducing fuzzing and yarn breakage, severely impacting product quality and production efficiency. Therefore, the applicant proposes the following technical solution:

[0025] Example 1

[0026] A weather-resistant polyester FDY oiling agent, composed of the following components:

[0027]

[0028] The following process was used for preparation: S1, Smoothing agents A, B, and C were heated to 70°C and then mixed and stirred at 500 rpm for 35 min; S2, Antistatic agent and emulsifier B were added and stirred at 300 rpm for 20 min, then 70°C deionized water and penetrant were slowly added and stirred at 2800 rpm for 40 min, then emulsifier A was added and sheared and emulsified at 3000 rpm for 30 min; S3, The mixture was cooled to room temperature and the pH was adjusted to 6.8 to obtain the final product.

[0029] Example 2

[0030] A weather-resistant polyester FDY oiling agent, composed of the following components:

[0031]

[0032] Prepared using the following process:

[0033] S1. Heat smoothing agents A, B, and C to 75°C and mix them at 630 rpm for 52 min. S2. Then add antistatic agent and emulsifier B and stir at 250 rpm for 45 min. Then slowly add 75°C deionized water and penetrant and stir at 3200 rpm for 30 min. Then add emulsifier A and shear emulsify at 3700 rpm for 25 min. S3. Cool to room temperature and adjust the pH to 7.3 to obtain the final product.

[0034] Example 3

[0035] A weather-resistant polyester FDY oiling agent, composed of the following components:

[0036]

[0037] Prepared using the following process:

[0038] S1. Heat smoothing agents A, B, and C to 68°C and mix at 820 rpm for 45 min. S2. Add antistatic agent and emulsifier B and stir at 370 rpm for 28 min. Then slowly add 69°C deionized water and penetrant and stir at 3200 rpm for 18 min. Add emulsifier A and shear emulsify at 2900 rpm for 40 min. S3. Cool to room temperature and adjust pH to 7.4. S4. Introduce nitrogen at a flow rate of 30 L / min, raise the pressure to 0.3 MPa, and hold for 3 min. Then slowly open the exhaust valve to release pressure to atmospheric pressure. Repeat this process twice. S5. Heat to 40°C and turn on the vacuum pump. Slowly reduce the pressure to 10 kPa at a rate of 2 kPa / min, controlling the stirring speed at 50 rpm. Then heat to 60°C and reduce the vacuum pressure to 7 kPa at a rate of 3 kPa / min, controlling the stirring speed at 100 rpm and holding for 20 min. Cool to room temperature and open the inlet valve to restore atmospheric pressure.

[0039] Comparative Example 1

[0040] The same technical solution as in Example 1 was adopted, except that dimethyl silicone oil mineral oil was used instead of tributylhexylammonium bis(pentafluoroethanesulfonyl)imide as the antistatic agent.

[0041] Comparative Example 2

[0042] The same technical solution as in Example 1 was adopted, except that the antistatic agent prepared in Example 1 of Publication No. CN119021001A was used instead of tributylhexylammonium bis(pentafluoroethanesulfonyl)imide.

[0043] Comparative Example 3

[0044] FDY spinning oil was prepared using the technical solution of Example 1 in CN119843395A.

[0045] Comparative Example 4

[0046] Polyester FDY oil was prepared using the technical solution of Example 9 in Publication No. CN115948911A.

[0047] Stability Test

[0048] 100 mL of the FDY oil prepared according to Examples 1-3 and Comparative Examples 1-3 was placed in a 180 mL capped glass bottle, the container was sealed, and it was left to stand for 72 hours in an environmental testing machine set to a predetermined temperature (5°C). Afterwards, the appearance of the spinning oil was visually assessed, and its coagulation properties were evaluated according to the following criteria. The fluidity referred to here is the following criteria when the container containing the spinning oil is tilted to the side: ◎: not coagulated and fluid; ○: cloudy, opaque appearance, partially coagulated; △: cloudy, opaque appearance, mostly coagulated; ×: completely coagulated, no fluidity. The obtained spinning oil was left to stand at 20°C for 2 hours, and then slowly added to 20°C exchange water and stirred for 60 minutes to prepare a 15 wt% O / W type emulsion. The stability of the emulsion was evaluated visually after one day: ○: maintaining a uniform emulsion state; △: observing floating matter on the liquid surface; ×: separation. The results are shown in Table 1.

[0049] Table 1. Effect of smoothing agent composition on the coagulation properties and emulsion stability of the treatment agent.

[0050]

[0051] As shown in Table 1 above, compared with Comparative Examples 3-4, in the ternary compound lubricating system formed by palmitoleic acid glyceride, polyglycerol-6 oleate, and pentaerythritol-4EO-triisostearate in Examples 1-3 of the present invention, the ethoxylated chain of pentaerythritol-4EO-triisostearate can disrupt molecular regularity and lower the freezing point. At the same time, polyglycerol-6 oleate can form hydrogen bonds, and its branched structure can inhibit crystallization to improve fluidity at low temperatures. Since the highly polar polyglycerol-6 oleate and the non-polar pentaerythritol-4EO-triisostearate synergistically achieve emulsification uniformity through HLB value, the stability is good. For Comparative Examples 1-2, when the antistatic agent in the spinning oil is changed, it will also affect the stability of the final spinning oil. However, Comparative Example 2 also uses an ionic liquid antistatic agent, and ultimately also has good stability at low temperatures, which is significantly better than that of Comparative Example 1.

[0052] Antistatic Property Test

[0053] The volume resistivity of the FDY oils prepared according to Examples 1-3 and Comparative Examples 1-3 was measured after equilibration at different humidity levels for 24 hours. The results are shown in Table 2. The specific method for measuring volume resistivity is existing technology and will not be described in detail here.

[0054] Table 2 Antistatic properties of spinning oils under different conditions

[0055]

[0056] As shown in Table 2, the FDY spinning oil prepared in Examples 1-3 of this application uses tributylhexylammonium bis(pentafluoroethanesulfonyl)imide as an antistatic agent. This ionic liquid is liquid over a wide temperature range and has uniform affinity in the lubricating base oil, which helps improve the stability of the spinning oil at low temperatures. In addition, the antistatic agent spontaneously dissociates from the quaternary ammonium cation and the fluorosulfonylimide anion in the oil phase to form free ion channels, achieving charge dissipation through directional ion migration. The perfluoroalkyl chain can repel water molecules, making the conductivity almost unaffected by humidity. The volume resistivity fluctuation is small and less than 10 Ω under dry conditions. ^9 The Ω.cm is lower than that of Comparative Example 2. Comparative Example 1 uses dimethyl silicone oil mineral oil as an antistatic agent, and the antistatic performance of the spinning oil is poor under different humidity conditions; while the spinning oils corresponding to Examples 3 and 4 have good antistatic performance at 55%RH, but their antistatic performance decreases when the ambient humidity is low, and they are easily affected by the external environment.

[0057] Spinning Property Test

[0058] The applicant discovered that for a large quantity of filaments, the degree of oil adhesion between the filaments varies when using existing oiling agents for oiling, leading to differences in frictional resistance between the filaments. This results in filament breakage and fuzzing in the downstream stretching rollers and winding machine. Therefore, the applicant proposes the following technical solution:

[0059] like Figures 1-3As shown, a spinning device includes an oil guide for gathering multiple single fibers into a yarn and coating its surface with an oil. The oil guide includes a connected main body 1 and an oil supply part 2. The main body 1 includes a contact surface 11, and the contact surface 11 is sequentially provided with an oil outlet 1011, a second groove 1022, and a first groove 1021 from the upstream end to the downstream section. The oil supply part 2 is provided with an oil delivery channel 21, and the inlet end of the oil delivery channel 21 is connected to a pump assembly for delivering oil to the oil outlet 1011. The first groove 1021 and the second groove 1022 extend along the width direction of the contact surface 11. There are multiple second grooves 1022 arranged sequentially along the length direction of the contact surface 11. There are two first grooves 1021 arranged at intervals. The groove depth and groove width of a single second groove 1022 are both smaller than those of a single first groove 1021.

[0060] When the number of fibers is relatively small, such as 120d / 72f, the oil agent stored in the first groove 1021 with its large depth and width forms an appropriate oil film almost uniformly on each fiber. When there are more single fibers, such as 120d / 144f or 240d / 288f, the first groove 1021 alone cannot stabilize the thickness of the oil film covering the contact surface 11 to the extent that the oil agent diffuses to all fibers. Some fibers pass through the limiting passage 5 with the oil film not fully attached. At this time, because the capillary force of the second groove 1022 on the oil agent is large, it can stabilize the thickness of the oil film covering the contact surface 11 to the extent that the oil agent can diffuse to all single fibers.

[0061] Furthermore, if only a plurality of second grooves 1022 with small depth and width are formed on the contact surface 11, when the number of individual fibers is small, there is a possibility that excessive oil may scatter downwards when the oil adheres excessively to each individual fiber and causes it to separate from the main body 1. In other words, by setting the first groove 1021 and the second groove 1022, the effect of excessive oil adhesion to individual fibers can be suppressed. As an example of the present invention, the width and depth of the first groove 20 are 0.8 mm and 0.5 mm, respectively, and the width and depth of the second groove 21 are 0.25 mm and 0.2 mm, respectively.

[0062] As an example of the present invention, the main body 2 is provided with a first sidewall 3 and a second sidewall 4 that are generally triangular and opposite to each other, and a limiting passage 5 for the yarn to pass through from top to bottom is formed between the first sidewall 3 and the second sidewall 4. As an example of the present invention, the inner sidewalls of the first sidewall 3 and the second sidewall 4 gradually approach each other, so that the width of the limiting passage 5 gradually narrows from top to bottom, thereby allowing multiple single fibers to gradually converge into a single yarn during the process of travel.

[0063] Preferably, the contact surface 7 is used to contact the moving yarn and includes a first curved portion 101 and a second curved portion 102. The first curved portion 101 is located upstream of the second curved portion 102 and has an oil outlet 1011. The oil outlet 1011 is located at the middle position in the width direction of the limiting passage 5 and does not contact the yarn. This arrangement ensures that the oil discharged from the oil outlet 1011 does not directly adhere to the single fiber, but flows along the contact surface 7 and adheres to the single fiber simultaneously, thereby reducing the pulsating effect of the oil attachment pump assembly to improve the uniformity of adhesion. As an example of the present invention, both the first groove 1021 and the second groove 1022 are provided in the second curved portion 102.

[0064] In the melt spinning process, yarn prepared by melt spinning polyester polymer and cooling and solidifying was coated with the FDY oiling agent obtained from Examples 1-3 and Comparative Example 4, which directly oiled crude oil, using the spinning apparatus including oiling agent a described in this application. The coating amount was 0.8% by weight, the ambient temperature was 25°C, and the ambient humidity was 55%RH. The above-prepared spinning oiling agent was coated, while a spinning apparatus containing conventional oiling agent b was used as a control. The yarn coated with the treatment agent was continuously stretched without a single winding and stretched 2.6 times by a hot roller at 180°C to obtain a yarn with 120d / 114f filaments. The stretched and heat-set yarn was wound up, but the filaments were immediately gathered by interlacing before winding. Interlacing was performed by spraying high-pressure fluid (such as high-pressure air) through a nozzle. The number of yarn breaks after 48 hours of operation was evaluated according to the following criteria, and the results are shown in Table 3. ○ represents less than 1 yarn breakage, △ represents more than 1 but less than 3 yarn breakages, × represents more than 3 but less than 5 yarn breakages, and * represents more than 5 yarn breakages.

[0065] Table 3. Effects of spinning oils on production continuity and stability

[0066]

[0067] As shown in Table 3, compared to Comparative Example 4, the FDY oiling agents prepared in Examples 1-3 of this application can uniformly adhere to the fiber yarns, resulting in higher product quality during yarn manufacturing and processing. Compared to Examples 1-2, Example 3 reduces the amount of dissolved gas components in the oiling agent by subjecting it to nitrogen replacement, degassing under reduced pressure, and heating treatment. This effectively prevents operational problems such as yarn breakage caused by air bubbles in the supply system when supplying the oiling agent to the fiber yarns, as well as quality problems caused by uneven oiling agent adhesion, ensuring stable and uniform coating of the oiling agent onto the yarns. Furthermore, compared to traditional structures, the oiling agent guide described in this application can further improve the uniformity of oiling agent coating on the yarns, further reduce the frequency of yarn breakage, and ensure production stability and product quality.

[0068] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. An FDY oiling agent that can be directly applied to crude oil, characterized in that, The product comprises the following components by weight: 58-62 parts of composite smoothing agent, 16-20 parts of emulsifier, 5-9 parts of antistatic agent, 3-7 parts of penetrant, and 6-10 parts of deionized water. The antistatic agent is tributylhexylammonium bis(pentafluoroethanesulfonyl)imide. The composite smoothing agent is composed of palmitoleic acid glyceride, polyglycerol-6 oleate, and pentaerythritol-4EO-triisostearate in a mass ratio of 30-40:10-15:8-12. Prepared using the following method: S1. Heat smoothing agents A, B, and C to 68-75℃ and mix at 500-900 rpm for 30-60 minutes. S2. Add antistatic agent and emulsifier B, stirring at 250-400 rpm for 20-50 minutes. Then slowly add deionized water (65-75℃) and penetrant, stirring at 2500-3200 rpm for 10-50 minutes. Next, add emulsifier A and shear emulsify at 2500-3500 rpm for 15-50 minutes. S3. Cool to room temperature and adjust the pH to 6.5-7.

5. S4. Introduce nitrogen at a flow rate of 20-40 L / min, pressurize to 0.25-0.35 MPa, hold for 2-4 minutes, then slowly open the exhaust valve to release pressure to atmospheric pressure. Repeat this process 1-3 times. S5. Heat to 38℃. At ~45℃, turn on the vacuum pump and slowly reduce the pressure to 9~12kPa at a rate of 1.8~2.2kPa / min, controlling the stirring speed at 48~55rpm. Then, raise the temperature to 58~65℃ and reduce the vacuum pressure to 6.8~7.5kPa at a rate of 2.9~3.2kPa / min, controlling the stirring speed at 80~120rpm and maintaining it for 15~30min. Cool to room temperature and open the air inlet valve to restore to atmospheric pressure to obtain the product. Among them, smoothing agent A is palm oleate glyceryl ester, smoothing agent B is polyglycerol-6 oleate, smoothing agent C is pentaerythritol-4EO-triisostearate, emulsifier A is polyoxyethylene sorbitan monooleate or polyoxyethylene glycerol monostearate or dehydrated sorbitan fatty acid ester, and emulsifier B is octylphenol polyoxyethylene ether or laurate polyoxyethylene ether or polyethylene glycol fatty acid ester.

2. The FDY oiling agent that can be directly applied to crude oil according to claim 1, characterized in that, Composed of the following parts by weight: The composite smoothing agent comprises 59.5–60.8 parts, emulsifier 17.5–18.5 parts, antistatic agent 6–8.4 parts, penetrant 3.8–6.0 parts, and deionized water 8–10 parts. The composite smoothing agent is composed of palmitoleic acid glyceride, polyglycerol-6 oleate, and pentaerythritol-4EO-triisostearate in a mass ratio of 35.1–39.2:12.2–14.9:9.5–10.

8.

3. The FDY oiling agent that can be directly applied to crude oil according to claim 2, characterized in that, The penetrant includes at least one of isooctanol polyoxyethylene ether-6, polyether siloxane, and C4 alcohol block polyether.

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