A high-appearance low-temperature clear varnish

Abstract

This invention relates to the field of varnish preparation technology and discloses a high-appearance, low-temperature varnish, comprising 20-30 parts by weight of phthalic anhydride, 10-30 parts by weight of maleic anhydride, 50-100 parts by weight of diol unsaturated polyester resin, and 5-10 parts by weight of styrene crosslinking agent; wherein the diol unsaturated polyester resin refers to a polymer compound containing unsaturated double bonds generated by the condensation reaction of a diacid and a diol. This invention has the following advantages and effects: the varnish prepared using phthalic anhydride, maleic anhydride, diol unsaturated polyester resin, and styrene crosslinking agent has a light transmittance of over 95% according to experiments, thus exhibiting good transparency. Ultimately, this results in a film film with high surface brightness, thereby giving the varnish a high aesthetic appeal.

Description

Technical Field

[0001] This invention relates to the field of varnish preparation technology, and in particular to a high-appearance, low-temperature varnish. Background Technology

[0002] Varnish, also known as clear varnish, is a coating composed of resin as the main film-forming substance and solvent. Because both the coating and the film are transparent, it is also called a transparent coating. When applied to the surface of an object, it dries to form a smooth film, revealing the original texture of the surface.

[0003] Currently, Chinese patent publication number CN113166582, published on July 23, 2021, discloses a low-temperature curable varnish composition comprising 10 to 40 parts by weight of a silicone-modified polyester polyol resin, 10 to 40 parts by weight of an acrylic polyol resin, and 5 to 40 parts by weight of an isocyanate resin. The silicone-modified polyester polyol resin has a hydroxyl value of 200 mg KOH / g to 300 mg KOH / g, an acid value of 1 mg KOH / g to 20 mg KOH / g, a number-average molecular weight of 100 g / mol to 2,000 g / mol, and a glass transition temperature greater than 0°C and below 20°C.

[0004] The aesthetic appeal of the smooth film formed after the varnish is applied mainly depends on its transparency. Higher transparency results in a brighter film surface and improved aesthetics. However, this low-temperature curable varnish composition does not have high transparency, so the film surface formed after using this varnish does not have high brightness. Summary of the Invention

[0005] The purpose of this invention is to provide a high-appearance, low-temperature clear varnish with high transparency.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a high-appearance low-temperature clear varnish, comprising 20-30 parts by weight of phthalic anhydride, 10-30 parts by weight of maleic anhydride, 50-100 parts by weight of diol unsaturated polyester resin, and 5-10 parts by weight of styrene crosslinking agent; wherein the diol unsaturated polyester resin refers to a polymer compound containing unsaturated double bonds generated by the polycondensation reaction of diacid and diol.

[0007] By adopting the above technical solution, the varnish prepared using phthalic anhydride, maleic anhydride, diol unsaturated polyester resin and styrene crosslinking agent has a light transmittance of over 95% according to experiments, thus exhibiting good transparency. Ultimately, the film formed by this varnish has a relatively high surface brightness, thereby giving the varnish a high aesthetic appeal.

[0008] A further feature of the present invention is that the curing temperature is 60°C to 100°C.

[0009] By adopting the above technical solution, this type of varnish can be cured in a relatively low temperature range of 60℃ to 100℃, which is conducive to the efficient curing of the varnish.

[0010] A further provision of the present invention is that the preparation method of this high-appearance low-temperature varnish includes the following steps:

[0011] S1: Add phthalic anhydride, maleic anhydride, and diol unsaturated polyester resin to the reactor in sequence, adjust the stirring speed to 600-1200 r / min, then add styrene crosslinking agent and continue stirring for 15-30 min;

[0012] S2: The iron drums are filled by transporting the contents through pipelines to the filling equipment.

[0013] By adopting the above technical solution, after the varnish is prepared in the reaction vessel, it is transported to the filling equipment through pipelines, and the varnish can be filled into iron drums through the filling equipment.

[0014] A further embodiment of the present invention includes: the filling equipment comprising a roller conveyor belt located on the ground for transporting multiple iron drums, a column located on one side of the roller conveyor belt, a conveying pump located at the upper end of the column and whose suction port is connected to the reactor via a pipe, an electromagnetic control valve located on the discharge port side of the conveying pump, a first connecting arm located on the column, a guide sleeve located at the end of the first connecting arm away from the column and extending vertically, a filling pipe passing through the guide sleeve and whose lower end is used to enter the mouth of the iron drum, a first corrugated hose with one end connected to the upper end of the filling pipe and the other end connected to the discharge port of the conveying pump, a second connecting arm located at the upper end of the filling pipe, and a drive cylinder located on the column with the piston rod end connected to the end of the second connecting arm away from the filling pipe.

[0015] By adopting the above technical solution, when the iron drum is moved to the bottom of the filling pipe, the drive cylinder drives the filling pipe to move down along the guide sleeve through the second connecting arm. Then the filling pipe can be inserted into the mouth of the iron drum. Then the electromagnetic control valve is opened, and the delivery pump can deliver the varnish through the first corrugated hose to the filling pipe. Finally, the varnish can be filled into the iron drum along the filling pipe.

[0016] After filling is completed, the electromagnetic control valve closes, and the drive cylinder drives the filling tube to move upward along the guide sleeve again through the second connecting arm. Then the filling tube can be moved out of the mouth of the iron drum. This cycle can be repeated to complete the varnish filling operation of multiple iron drums.

[0017] A further provision of the present invention is that the filling tube is also provided with a liquid level detection component, the liquid level detection component including a sliding sleeve sleeved at the lower end of the filling tube, a limiting ring disposed on the periphery of the lower end of the filling tube and used to abut against the lower end of the sliding sleeve, an annular airbag disposed on the periphery of the lower end of the sliding sleeve and used to float on the liquid level surface inside the iron drum, a connecting rod disposed on the upper end of the sliding sleeve and extending in a vertically upward direction, and a liquid level rod disposed on the upper end of the connecting rod.

[0018] By adopting the above technical solution, when the lower end of the filling tube is inserted into the iron drum, the sliding sleeve and the annular air bladder at the lower end of the filling tube can enter the iron drum at the same time. As the varnish is filled into the iron drum, when the varnish is filled to the height of the filling tube, the rise of the varnish liquid level can drive the annular air bladder and the connecting rod to rise. At this time, the operator can know the liquid level of the varnish in the iron drum by observing the liquid level rod at the upper end of the connecting rod. Ultimately, this will help the operator to accurately fill the varnish in a quantitative manner.

[0019] Compared to existing technologies that use flow meters to calculate filling flow, this method simplifies filling equipment, saves equipment costs, and also reduces maintenance costs.

[0020] A further feature of the present invention is that a scale extending vertically downward is provided at the lower end of the guide sleeve, and the liquid level rod is arc-shaped and fits against the outer wall of the scale.

[0021] By adopting the above technical solution, when the liquid level rod rises with the liquid level of the varnish in the iron drum, the liquid level rod is attached to the scale at the lower end of the guide sleeve. The scale can be used to indicate the specific liquid level data in the iron drum, which ultimately makes it convenient for operators to accurately fill the varnish in a quantitative manner.

[0022] A further provision of the present invention is that: an air pump for inflating or deflating the annular airbag is provided on the side wall of the guide sleeve; the air pump includes a cylinder body, an air outlet integrally disposed at the lower end of the cylinder body, a push-pull rod disposed on the upper side of the cylinder body, a piston head disposed at the lower end of the push-pull rod and embedded in the cylinder body, and a retaining ring disposed on the inner circumferential wall of the upper end of the cylinder body and used to abut against the upper side of the piston head; a second corrugated hose is provided on the air pump, the upper end of which is connected to the air outlet and the lower end of which is connected to the annular airbag; an iron plate is provided at the end of the push-pull rod away from the piston head; and a magnetic plate for attracting the iron plate is provided at the upper end of the filling tube.

[0023] By adopting the above technical solution, when the driving cylinder moves the filling tube downward, the annular airbag in a deflated state can enter the iron drum as the filling tube moves downward due to the gap between the iron plate and the magnetic plate. When the deflated annular airbag passes the mouth of the iron drum, the magnetic plate can abut against and be attracted to the iron plate. As a result, the magnetic plate moves downward and pushes the push-pull rod on the cylinder, causing the piston head to sink into the cylinder. At this time, the air in the cylinder can be pressed into the annular airbag through the second corrugated hose. After the annular airbag inflates, it can easily float on the varnish surface.

[0024] After filling is completed, the drive cylinder moves the filling tube upward. First, the magnetic plate is attracted to the iron plate, so the magnetic plate can move the iron plate upward. The upward movement of the magnetic plate pulls the push rod, causing the piston head to rise in the cylinder. At this time, the air in the annular air bladder can be drawn into the cylinder, so that the annular air bladder returns to its deflated state. As the drive cylinder continues to move the filling tube upward, the piston head can abut against the retaining ring, so that the iron plate and the magnetic plate separate. At this time, the deflated annular air bladder can pass smoothly through the mouth of the iron drum.

[0025] Throughout the filling process, the annular airbag remains deflated as it passes through the mouth of the iron drum, which facilitates the smooth passage of the filling tube through the drum mouth. At the same time, the reduced size of the annular airbag allows it to fit the mouths of iron drums of different sizes, making it easier for the filling tube to pass through the mouths of iron drums of different sizes.

[0026] A further feature of the present invention is that the outer diameter of the annular airbag in the deflated state is smaller than the outer diameter of the limiting ring.

[0027] By adopting the above technical solution, the outer diameter of the annular airbag in its deflated state is smaller than the outer diameter of the limiting ring, which further facilitates the annular airbag to pass smoothly through the mouth of the iron barrel.

[0028] A further feature of the present invention is that a fixed arm is provided at the lower end of the guide sleeve, a contact switch electrically connected to the electromagnetic control valve is provided on the lower side of the fixed arm, and an upper limit control end is provided at the upper end of the connecting rod for triggering the contact switch after moving upward and contacting it.

[0029] By adopting the above technical solution, after filling is completed and the driving cylinder moves the filling tube upward, the upper limit control end of the connecting rod can abut against the contact switch on the fixed arm. At this time, the contact switch can control the solenoid control valve to close, so that the varnish no longer enters the filling tube. At the same time, when filling begins and the driving cylinder moves the filling tube downward, the upper limit control end can separate from the contact switch. At this time, the contact switch can control the solenoid control valve to open, so that the varnish can begin to enter the filling tube. Finally, the opening and closing of the solenoid control valve can be driven by the up and down movement of the filling tube to realize automatic feeding according to the up and down movement of the filling tube.

[0030] The beneficial effects of this invention are as follows: When the iron drum moves below the filling tube, the drive cylinder drives the filling tube to move down along the guide sleeve via the second connecting arm. First, the upper limit control end can separate from the contact switch. At this time, the contact switch can control the electromagnetic control valve to open, allowing the varnish to begin entering the filling tube. Since there is a gap between the iron plate and the magnetic plate, the deflated annular airbag can enter the iron drum as the filling tube moves down. When the deflated annular airbag passes the mouth of the iron drum, the magnetic plate can abut against and be attracted to the iron plate. Thus, the downward movement of the magnetic plate pushes the push-pull rod on the cylinder, causing the piston to... The nozzle is lowered into the cylinder, allowing air inside to be forced into the annular air bladder through the second corrugated hose. Once inflated, the air bladder floats easily on the varnish surface. The filling tube is then inserted into the opening of the iron drum, and the varnish is poured into the drum along the filling tube. As the varnish is filled, once it reaches the height of the filling tube, the rising varnish level causes the annular air bladder and connecting rod to rise. The operator can then observe the position of the level rod on the scale to determine the varnish level in the drum, facilitating precise quantitative filling.

[0031] After filling is completed, the drive cylinder moves the filling tube upward. First, the magnetic plate, attracted to the iron plate, moves the iron plate upward, pulling the push rod and causing the piston head to rise inside the cylinder. At this point, air is drawn from the annular airbag into the cylinder, restoring the annular airbag to its deflated state. As the drive cylinder continues to move the filling tube upward, the piston head contacts the retaining ring, causing the iron plate and magnetic plate to separate. The deflated annular airbag then smoothly passes through the opening of the iron drum, and the filling tube exits from the drum opening. Simultaneously, as the drive cylinder continues to move the filling tube upward, the upper limit control end of the connecting rod contacts the contact switch on the fixed arm. The contact switch then controls the solenoid control valve to close, preventing varnish from entering the filling tube.

[0032] This cycle can be repeated to complete the varnish filling operation for multiple iron drums. Compared with the existing technology that uses a flow meter to calculate the filling flow, this simplifies the filling equipment, saves equipment costs, and also reduces maintenance costs. At the same time, the electromagnetic control valve can be opened and closed according to the up and down movement of the filling tube, so as to realize automatic material feeding based on the up and down movement of the filling tube. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the filling equipment in this invention;

[0035] Figure 2 This is a partial enlarged view of the filling equipment in this invention, where the filling tube has moved to the upper limit position and the annular airbag is in a deflated state.

[0036] Figure 3 This is a partial structural plan view of the filling equipment in this invention, in which the iron drum is cut out, and at this time the filling tube is moved down to the lower limit position and the annular air bladder is in an inflated state;

[0037] Figure 4 This is a cross-sectional view of the air pump in the filling equipment.

[0038] In the diagram, 1. Filling equipment; 11. Roller conveyor belt; 12. Column; 13. Conveying pump; 14. Electromagnetic control valve; 15. First connecting arm; 16. Guide sleeve; 161. Scale; 162. Fixed arm; 163. Contact switch; 17. Filling pipe; 171. Magnetic plate; 18. First corrugated hose; 19. Second connecting arm; 101. Drive cylinder; 2. Liquid level detection assembly; 21. Sliding sleeve; 22. Limiting ring; 23. Annular airbag; 24. Connecting rod; 241. Upper limit control end; 25. Liquid level rod; 3. Air pump; 31. Cylinder body; 32. Air outlet end; 33. Push-pull rod; 331. Iron plate; 34. Piston head; 35. Snap ring; 301. Second corrugated hose. Detailed Implementation

[0039] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] A high-appearance low-temperature varnish comprises 20-30 parts by weight of phthalic anhydride, 10-30 parts by weight of maleic anhydride, 50-100 parts by weight of diol unsaturated polyester resin, and 5-10 parts by weight of styrene crosslinking agent; wherein the diol unsaturated polyester resin refers to a polymer compound containing unsaturated double bonds generated by the condensation reaction of diacid and diol; wherein the curing temperature of the high-appearance low-temperature varnish is 60℃ to 100℃.

[0041] The transmittance of this high-appearance, low-temperature varnish was tested using a BGD-412 transparency meter, designed and manufactured according to GB1721 "Determination of Appearance and Transparency of Varnishes, Oils and Thinners"; the volume of the varnish test sample was 10 cubic centimeters.

[0042] The light transmittance of this high-appearance low-temperature varnish was compared using different embodiments;

[0043] Example 1: 20 parts by weight of phthalic anhydride, 10 parts by weight of maleic anhydride, 55 parts by weight of diol unsaturated polyester resin, and 5 parts by weight of styrene crosslinking agent;

[0044] Example 2: Phthalic anhydride 23 parts by weight, maleic anhydride 13 parts by weight, diol unsaturated polyester resin 65 parts by weight, styrene crosslinking agent 7 parts by weight:

[0045] Example 3: 27 parts by weight of phthalic anhydride, 20 parts by weight of maleic anhydride, 78 parts by weight of diol unsaturated polyester resin, and 6 parts by weight of styrene crosslinking agent;

[0046] Example 4: 30 parts by weight of phthalic anhydride, 26 parts by weight of maleic anhydride, 88 parts by weight of diol unsaturated polyester resin, and 9 parts by weight of styrene crosslinking agent;

[0047] Comparative Example 1: Varnish purchased using existing technology.

[0048] The lengths of the charred areas of the leather test specimens in each embodiment and comparative example are shown in the table below;

[0049]

[0050]

[0051] The comparison shows that this high-appearance low-temperature varnish has a significant improvement in light transmittance compared to varnishes in existing technologies.

[0052] The preparation method of this high-appearance low-temperature varnish includes the following steps:

[0053] S1: Add phthalic anhydride, maleic anhydride, and diol unsaturated polyester resin to the reactor in sequence, adjust the stirring speed to 600-1200 r / min, then add styrene crosslinking agent and continue stirring for 15-30 min;

[0054] S2: The contents are transported via pipeline to filling equipment 1 for filling into iron drums.

[0055] Reference Figure 1 , Figure 2 The filling equipment 1 includes a roller conveyor belt 11, a column 12, a delivery pump 13, an electromagnetic control valve 14, a first connecting arm 15, a guide sleeve 16, a filling pipe 17, a first corrugated hose 18, a second connecting arm 19, and a drive cylinder 101. The roller conveyor belt 11 is fixed to the ground with anchor bolts, and the column 12 is located on one side of the roller conveyor belt 11, with its lower end also fixed to the ground with anchor bolts. The delivery pump 13 is bolted to the upper end of the column 12, and its suction port is connected to a reaction vessel via a pipe. The delivery pump 13 can be used to deliver the varnish prepared in the reaction vessel. The electromagnetic control valve 14 is installed at the discharge port of the delivery pump 13. At the location, one end of the first connecting arm 15 is fixed to the column 12 by bolts, and the guide sleeve 16 is welded to the end of the first connecting arm 15 away from the column 12. The filling tube 17 passes through the guide sleeve 16 and its lower end is used to enter the mouth of the iron drum. One end of the first corrugated hose 18 is connected to the upper end of the filling tube 17 by a clamp and the other end is connected to the discharge port of the conveying pump 13 by a clamp. The second connecting arm 19 is welded to the upper end of the filling tube 17. At the same time, the drive cylinder 101 is fixed to the column 12 by bolts and extends in the vertical direction. The piston rod end of the upper end of the drive cylinder 101 is connected to the end of the second connecting arm 19 away from the filling tube 17 by bolts.

[0056] Reference Figure 2 , Figure 3The filling tube 17 is also equipped with a liquid level detection component 2, which includes a sliding sleeve 21, a limiting ring 22, an annular air bladder 23, a connecting rod 24, and a liquid level rod 25. The sliding sleeve 21 is fitted onto the lower end of the filling tube 17, while the limiting ring 22 is integrally set on the circumference of the lower end of the filling tube 17 and is used to abut against the lower end of the sliding sleeve 21. The limiting ring 22 can limit the lower limit position of the sliding sleeve 21 after it moves down. At the same time, the annular air bladder 23 is bonded to the circumference of the lower end of the sliding sleeve 21. After the annular air bladder 23 is inflated, it floats on the surface of the varnish liquid level in the iron drum. The outer diameter of the annular air bladder 23 in its deflated state is smaller than the outer diameter of the limiting ring 22. The connecting rod 24... The lower end of the guide sleeve 16 is welded to the upper end of the sliding sleeve 21 and extends vertically upward. At the same time, the liquid level rod 25 is welded to the upper end of the connecting rod 24. The lower end of the guide sleeve 16 is bonded with a scale 161 extending vertically downward. The liquid level rod 25 is arc-shaped and fits against the outer wall of the scale 161. The lower end of the guide sleeve 16 is also welded with a fixed arm 162. The lower side of the fixed arm 162 is bonded with a contact switch 163 that is electrically connected to the solenoid control valve 14. The opening and closing of the solenoid control valve 14 can be controlled by the contact switch 163. At the same time, the upper end of the connecting rod 24 is also welded with an upper limit control end 241 for triggering the contact switch 163 after it moves upward and contacts the contact switch 163.

[0057] Reference Figure 2 , Figure 3 , Figure 4 An air pump 3 for inflating or deflating the annular airbag 23 is provided on the side wall of the guide sleeve 16. This air pump 3 includes a cylinder 31, an air outlet 32, a push-pull rod 33, a piston head 34, and a retaining ring 35. The cylinder 31 is connected to the side wall of the guide sleeve 16 by a clamp, and the air outlet 32 ​​is integrally located at the lower end of the cylinder 31. The push-pull rod 33 is located on the upper side of the cylinder 31, with its lower end embedded inside the cylinder 31. The piston head 34 is bonded to the lower end of the push-pull rod 33 and embedded inside the cylinder 31. The piston head 34 is made of rubber and its outer periphery is pressed against the inner periphery of the cylinder 31. The retaining ring 35 is integrally set on the inner periphery of the upper end of the cylinder 31 and is used to abut against the upper side of the piston head 34. At the same time, the air pump 3 is provided with a second corrugated hose 301 whose upper end is inserted into the air outlet 32 ​​and whose lower end is connected to the annular air bag 23. An iron plate 331 is bonded to the end of the push-pull rod 33 away from the piston head 34. The upper end of the filling tube 17 is connected by bolts to a magnetic plate 171 for attracting the iron plate 331.

[0058] Principle: When the iron drum moves below the filling tube 17, the drive cylinder 101 drives the filling tube 17 to move down along the guide sleeve 16 via the second connecting arm 19. First, the upper limit control end 241 can separate from the contact switch 163. At this time, the contact switch 163 can control the electromagnetic control valve 14 to open, allowing the varnish to enter the filling tube 17. Since there is a gap between the iron plate 331 and the magnetic plate 171, the deflated annular airbag 23 can enter the iron drum as the filling tube 17 moves down. When the deflated annular airbag 23 passes the mouth of the iron drum, the magnetic plate 171 can abut against and be attracted to the iron plate 331. Thus, the downward movement of the magnetic plate 171 pushes the push-pull rod 3 on the cylinder 31. 3. This causes the piston head 34 to sink into the cylinder 31. At this time, the air in the cylinder 31 can be forced into the annular air bladder 23 through the second corrugated hose 301. After the annular air bladder 23 inflates, it can float on the surface of the varnish. Then, the filling tube 17 can be inserted into the mouth of the iron drum, and finally the varnish can be filled into the iron drum along the filling tube 17. As the varnish is filled into the iron drum, when the varnish reaches the height of the filling tube 17, the rise in the varnish level will drive the annular air bladder 23 and the connecting rod 24 to rise. At this time, the operator can know the height of the varnish in the iron drum by observing the position of the liquid level rod 25 at the upper end of the connecting rod 24 on the scale 161. This will help the operator to accurately fill the varnish in a quantitative manner.

[0059] After filling is completed, the drive cylinder 101 moves the filling tube 17 upward. Firstly, the magnetic plate 171, attracted to the iron plate 331, moves the iron plate 331 upward. This upward movement of the magnetic plate 171 pulls the push rod 33, causing the piston head 34 to rise inside the cylinder 31. At this time, the air inside the annular air bladder 23 is drawn into the cylinder 31, causing the annular air bladder 23 to return to its deflated state. As the drive cylinder 101 continues to move the filling tube 17 upward, the piston head 34... The circlip 23 can abut against the retaining ring 35, thereby causing the iron plate 331 and the magnet plate 171 to separate. At this time, the deflated annular airbag 23 can pass smoothly through the mouth of the iron drum, and the filling tube 17 can be moved out of the mouth of the iron drum. At the same time, as the drive cylinder 101 continues to drive the filling tube 17 to move upward, the upper limit control end 241 of the upper end of the connecting rod 24 can abut against the contact switch 163 on the fixed arm 162. At this time, the contact switch 163 can control the electromagnetic control valve 14 to close, so that the varnish no longer enters the filling tube 17.

[0060] This cycle can be repeated to complete the varnish filling operation for multiple iron drums. Compared with the existing technology that uses a flow meter to calculate the filling flow, this simplifies the filling equipment 1, saves equipment costs, and also reduces maintenance costs. At the same time, the electromagnetic control valve 14 can be opened and closed according to the up and down movement of the filling pipe 17, so as to realize automatic material feeding according to the up and down movement of the filling pipe 17.

Claims

1. A filling device for high-appearance, low-temperature clear varnish, characterized in that: A high-appearance low-temperature clear varnish comprises 20-30 parts by weight of phthalic anhydride, 10-30 parts by weight of maleic anhydride, 50-100 parts by weight of diol unsaturated polyester resin, and 5-10 parts by weight of styrene crosslinking agent; wherein the diol unsaturated polyester resin refers to a polymer compound containing unsaturated double bonds generated by the polycondensation reaction of diacid and diol. The preparation method of this high-appearance low-temperature varnish includes the following steps: S1: Add phthalic anhydride, maleic anhydride, and diol unsaturated polyester resin to the reactor in sequence, adjust the stirring speed to 600-1200 r / min, then add styrene crosslinking agent and continue stirring for 15-30 min; S2: The iron drums are filled by transporting the contents through a pipeline to the filling equipment (1); The filling equipment (1) includes a roller conveyor belt (11) located on the ground for transporting multiple iron drums, a column (12) located on one side of the roller conveyor belt (11), a conveying pump (13) located on the upper end of the column (12) with its suction port connected to the reactor via a pipe, an electromagnetic control valve (14) located on the discharge port side of the conveying pump (13), a first connecting arm (15) located on the column (12), a guide sleeve (16) located at the end of the first connecting arm (15) away from the column (12) and extending vertically, and a guide sleeve (16) passing through the guide sleeve (16) with its lower end for inserting into the mouth of the iron drum. The filling tube (17), a first corrugated hose (18) with one end connected to the upper end of the filling tube (17) and the other end connected to the outlet of the delivery pump (13), a second connecting arm (19) set at the upper end of the filling tube (17), and a drive cylinder (101) set on the column (12) with the piston rod end connected to the end of the second connecting arm (19) away from the filling tube (17); the filling tube (17) is also provided with a liquid level detection assembly (2), the liquid level detection assembly (2) including a sliding sleeve (21) sleeved at the lower end of the filling tube (17), and a circumferential sleeve set at the lower end of the filling tube (17) and A limiting ring (22) for abutting against the lower end of the sliding sleeve (21), an annular airbag (23) for floating on the liquid level surface inside the iron drum and located on the periphery of the lower end of the sliding sleeve (21), a connecting rod (24) located on the upper end of the sliding sleeve (21) and extending vertically upward, and a liquid level rod (25) located on the upper end of the connecting rod (24); an air pump (3) for inflating or deflating the annular airbag (23) is provided on the side wall of the guide sleeve (16), the air pump (3) including a cylinder (31), an air outlet (32) integrally located on the lower end of the cylinder (31), and a liquid level rod (25) located on the upper side of the cylinder (31). The push-pull rod (33), the piston head (34) set at the lower end of the push-pull rod (33) and embedded in the cylinder (31), and the retaining ring (35) set at the inner wall of the upper side of the cylinder (31) and used to abut against the upper side of the piston head (34) are provided on the air pump (3). The upper end of the air pump (3) is connected to the air outlet (32) and the lower end is connected to the annular air bag (23). An iron plate (331) is provided at the end of the push-pull rod (33) away from the piston head (34). A magnet plate (171) for attracting the iron plate (331) is provided at the upper end of the filling tube (17).

2. The filling equipment for high-appearance low-temperature varnish according to claim 1, characterized in that: The curing temperature is 60℃ to 100℃.

3. The filling equipment for high-appearance, low-temperature clear varnish according to claim 1, characterized in that: The guide sleeve (16) is provided with a scale (161) extending vertically downward at its lower end, and the liquid level rod (25) is arc-shaped and fits against the outer wall of the scale (161).

4. The filling equipment for high-appearance, low-temperature clear varnish according to claim 1, characterized in that: The outer diameter of the annular airbag (23) in its deflated state is smaller than the outer diameter of the limiting ring (22).

5. The filling equipment for high-appearance, low-temperature clear varnish according to claim 1, characterized in that: A fixed arm (162) is provided at the lower end of the guide sleeve (16), and a contact switch (163) electrically connected to the electromagnetic control valve (14) is provided on the lower side of the fixed arm (162). The upper end of the connecting rod (24) is also provided with an upper limit control end (241) for triggering the contact switch (163) after moving upward and contacting it.

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