阅读说明：本技术 一种脂肪族聚氨uv树脂及其制备方法 (Aliphatic polyurethane UV resin and preparation method thereof ) 是由 王石青 杨小梅 贺禧 于 2021-07-28 设计创作，主要内容包括：本发明公开了一种脂肪族聚氨UV树脂及其制备方法,属于树脂合成技术领域,该脂肪族聚氨UV树脂由有机异氰酸酯与聚酯多元醇混合反应后再与丙烯酸羟烷基酯进行封端反应而得到。其制备方法包括以下步骤：在反应釜中加入有机异氰酸酯,开启搅拌,控制反应器温度在60-95℃,然后加入聚酯多元醇进行反应；将阻聚剂、丙烯酸羟烷基酯预先混合均匀,然后将其加入反应釜,搅拌均匀后加入催化剂,当反应体系中NCO含量小于或等于0.5％时,反应结束；阻聚剂、催化剂用量均为有机异氰酸酯、聚酯多元醇、丙烯酸羟烷基酯总量的0.1％。本发明具有易分散、固含量高等优点。(The invention discloses aliphatic polyurethane UV resin and a preparation method thereof, belonging to the technical field of resin synthesis. The preparation method comprises the following steps: adding organic isocyanate into a reaction kettle, starting stirring, controlling the temperature of a reactor to be 60-95 ℃, and then adding polyester polyol for reaction; uniformly mixing a polymerization inhibitor and hydroxyalkyl acrylate in advance, adding the mixture into a reaction kettle, uniformly stirring, adding a catalyst, and finishing the reaction when the NCO content in a reaction system is less than or equal to 0.5%; the consumption of the polymerization inhibitor and the catalyst is 0.1 percent of the total amount of the organic isocyanate, the polyester polyol and the hydroxyalkyl acrylate. The invention has the advantages of easy dispersion, high solid content and the like.)

1. An aliphatic polyurethane UV resin characterized by: the polyester polyol is obtained by mixing organic isocyanate and polyester polyol for reaction and then carrying out end capping reaction with hydroxyalkyl acrylate.

2. The aliphatic polyamino UV resin according to claim 1, wherein: the organic isocyanate is one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate.

3. The aliphatic polyamino UV resin according to claim 1, wherein: in the mixing reaction process of the organic isocyanate and the polyester polyol, the molar ratio of the polyester polyol to the organic isocyanate is 1: (1.5-2.5) and the reaction temperature is 60-95 ℃.

4. The aliphatic polyamino UV resin according to claim 3, wherein: in the mixing reaction process of the organic isocyanate and the polyester polyol, the molar ratio of the polyester polyol to the organic isocyanate is 1: 1.7, the reaction temperature is 75 ℃.

5. The aliphatic polyamino UV resin according to claim 1, wherein: the polyester polyol is one or more of adipic acid type polyester polyol, polycaprolactone polyol and polycarbonate polyol.

6. The aliphatic polyamino UV resin according to claim 1, wherein: the molar ratio of isocyanate groups contained in the product obtained after the organic isocyanate and the polyester polyol are mixed and reacted to hydroxyl groups contained in the hydroxyalkyl acrylate is 1: (1-2).

7. The method for producing an aliphatic polyamino UV resin according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:

adding organic isocyanate into a reaction kettle, starting stirring, controlling the temperature of a reactor to be 60-95 ℃, and then adding polyester polyol for reaction; uniformly mixing a polymerization inhibitor and hydroxyalkyl acrylate in advance, adding the mixture into a reaction kettle, uniformly stirring, adding a catalyst, and finishing the reaction when the NCO content in a reaction system is less than or equal to 0.5%; the consumption of the polymerization inhibitor and the catalyst is 0.1 percent of the total amount of the organic isocyanate, the polyester polyol and the hydroxyalkyl acrylate.

8. The method of claim 7, wherein the method comprises the steps of: the reaction kettle comprises a jacket (1), an outer cylinder (2), an inner cylinder (3), a supporting cylinder (4), a top cover (5), a wall scraping mechanism, a stirring mechanism, a clamping mechanism, an outer pipe (9), an inner pipe (10), a cylinder (12), a feeding pipe (16), a supporting plate (18) and a flexible sealing sheet (20);

the jacket (1), the outer cylinder (2) and the inner cylinder (3) are sequentially arranged from outside to inside, the top cover (5) is fixed to the top of the outer cylinder (2), the supporting cylinder (4) is located in the outer cylinder (2), the upper end of the supporting cylinder is fixed to the top cover (5), the lower end of the feeding pipe (16) sequentially penetrates through the top cover (5) and the supporting plate (18), the outer diameter of the supporting cylinder (4) is smaller than the inner diameter of the inner cylinder (3), the supporting plate (18) is located in the supporting cylinder (4) and is in up-and-down sliding fit with the supporting cylinder (4), the stirring mechanism is installed on the supporting plate (18), the air cylinder (12) is used for driving the inner cylinder (3), the stirring mechanism and the supporting plate (18) to move up and down, the stirring mechanism comprises a stirring motor (71), a rotating shaft (72) and blades (73), the stirring motor (71) is installed on the supporting plate (18), the upper end of the rotating shaft (72) is connected with an output shaft of the stirring motor (71), the lower end of the rotating shaft is vertically inserted into the inner barrel (3), and the blades (73) are fixed in the axial direction of the rotating shaft (72);

the wall scraping mechanism comprises a limiting block (61), an inserting block (62), a connecting rod (63) and a scraping plate (64), wherein an annular groove (23) is formed in the circumferential surface of the supporting cylinder (4), the upper end of the scraping plate (64) is inserted into the annular groove (23) and is in sliding fit with the annular groove (23), the lower end of the scraping plate extends into the inner cylinder (3) and is in contact with the inner wall of the inner cylinder (3), the limiting block (61) is fixed on the scraping plate (64), a jack (65) is formed in the bottom of the limiting block (61), one end of the connecting rod (63) is connected to the rotating shaft (72), the other end of the connecting rod is connected with the inserting block (62), and in the upward moving process of the inner cylinder (3), the inserting block (62) is inserted into the jack (65) so that the scraping plate (64) coaxially rotates along with the rotating shaft (72);

the outer pipe (9) is positioned below the inner cylinder (3), the outer pipe (9) is fixed on the outer cylinder (2) and the jacket (1), the upper end of the outer pipe (9) is positioned in the outer cylinder (2), the lower end of the outer pipe sequentially passes through the outer cylinder (2) and the jacket (1) and extends downwards, the inner pipe (10) is inserted in the outer pipe (9) and the upper end of the inner pipe is connected with the bottom of the inner cylinder (3), through holes (21) are respectively arranged at two opposite sides of the inner tube (10), a flexible sealing sheet (20) for sealing the through holes (21) is fixed at the through holes (21), the clamping mechanisms are fixed in the outer cylinder (2) and are positioned at two opposite sides of the outer tube (9), the clamping mechanism is inserted into the through hole (21) after penetrating through the outer pipe (9), so that the inner tube (10) is clamped and sealed by the flexible sealing sheets (20) on two opposite sides.

9. The method of claim 8, wherein the method comprises the steps of: clamping mechanism is located in urceolus (2) and be in inner tube (3) below, clamping mechanism includes fixed plate (81), inserts post (82), deflector (83) and spring (84), fixed plate (81) are fixed the bottom in urceolus (2), deflector (83) are fixed plate (81) with between outer tube (9), insert post (82) sliding connection in deflector (83), spring (84) are connected fixed plate (81) with insert between post (82), insert post (82) one end with spring (84) are connected, and the other end is used for passing follow behind outer tube (9) through-hole (21) insert in inner tube (10).

10. The method of claim 8, wherein the method comprises the steps of: the reaction kettle is connected with a finished product tank (25) and a waste material barrel (26) through an outer pipe (9) through a pipeline, a first valve (29) is installed on a connecting pipeline of the reaction kettle and the finished product tank (25), and a second valve (30) is installed on a connecting pipeline of the reaction kettle and the waste material barrel (26);

be provided with filter screen (34), stir material mechanism and vibration mechanism on waste bin (26), filter screen (34) set up for the slope and fix in waste bin (26), it is used for the stirring to stir material mechanism material in waste bin (26), vibration mechanism installs stir in the material mechanism and be used for the drive filter screen (34) vibrate from top to bottom.

Technical Field

The invention relates to the technical field of resin synthesis, in particular to aliphatic polyurethane UV resin and a preparation method thereof.

Background

With the ever-increasing perfection and strictness of environmental protection laws and regulations, in recent years, Ultraviolet (UV) curing materials have wider and wider application range in the fields of coatings, printing inks, adhesives and the like due to the advantages of environmental friendliness, high efficiency and energy conservation. Due to the strict requirement of environmental protection, many places using solvent-based coatings, printing inks and adhesives in the coating production field are gradually replaced by environment-friendly and efficient ultraviolet curing (UV) materials.

With the adoption of ultraviolet light (UV) curing materials in the process of replacing traditional solvent-based coatings, due to the difference of performances, there are many places where the improvement and improvement of the performances of the UV materials are needed to meet the production requirements. The solid content of the ultraviolet curing water-based resin reported at present is only 30-40% and is not more than 50%, because the viscosity of the synthesized urethane acrylate prepolymer is too high, the polyurethane acrylate prepolymer cannot be dispersed by water and is not easy to form stable emulsion. In view of the above, the present invention provides an aliphatic polyurethane UV resin and a preparation method thereof.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the aliphatic polyurethane UV resin and the preparation method thereof, and the aliphatic polyurethane UV resin has the advantages of easiness in dispersion, high solid content and the like.

In order to achieve the purpose, the invention provides the following technical scheme:

the aliphatic polyurethane UV resin is prepared by mixing organic isocyanate and polyester polyol for reaction and then carrying out end-capping reaction with hydroxyalkyl acrylate.

More preferably: the organic isocyanate is one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate.

More preferably: in the mixing reaction process of the organic isocyanate and the polyester polyol, the molar ratio of the polyester polyol to the organic isocyanate is 1: (1.5-2.5) and the reaction temperature is 60-95 ℃.

More preferably: in the mixing reaction process of the organic isocyanate and the polyester polyol, the molar ratio of the polyester polyol to the organic isocyanate is 1: 1.7, the reaction temperature is 75 ℃.

More preferably: the polyester polyol is one or more of adipic acid type polyester polyol, polycaprolactone polyol and polycarbonate polyol.

More preferably: the molar ratio of isocyanate groups contained in the product obtained after the organic isocyanate and the polyester polyol are mixed and reacted to hydroxyl groups contained in the hydroxyalkyl acrylate is 1: (1-2).

The preparation method of the aliphatic polyurethane UV resin comprises the following steps:

adding organic isocyanate into a reaction kettle, starting stirring, controlling the temperature of a reactor to be 60-95 ℃, and then adding polyester polyol for reaction; uniformly mixing a polymerization inhibitor and hydroxyalkyl acrylate in advance, adding the mixture into a reaction kettle, uniformly stirring, adding a catalyst, and finishing the reaction when the NCO content in a reaction system is less than or equal to 0.5%; the dosage of the polymerization inhibitor and the catalyst is 0.1 percent of the weight of the organic isocyanate, the polyester polyol and the hydroxyalkyl acrylate.

More preferably: the reaction kettle comprises a jacket, an outer cylinder, an inner cylinder, a supporting cylinder, a top cover, a wall scraping mechanism, a stirring mechanism, a clamping mechanism, an outer pipe, an inner pipe, a cylinder, a feeding pipe, a supporting plate and a flexible sealing sheet;

the jacket, the outer barrel and the inner barrel are sequentially arranged from outside to inside, the top cover is fixed at the top of the outer barrel, the supporting barrel is positioned in the outer barrel, the upper end of the supporting barrel is fixed on the top cover, the lower end of the feeding pipe sequentially penetrates through the top cover and the supporting plate, the outer diameter of the supporting barrel is smaller than the inner diameter of the inner barrel, the supporting plate is positioned in the supporting barrel and is in up-and-down sliding fit with the supporting barrel, the stirring mechanism is installed on the supporting plate, the air cylinder is used for driving the inner barrel, the stirring mechanism and the supporting plate to move up and down, the stirring mechanism comprises a stirring motor, a rotating shaft and blades, the stirring motor is installed on the supporting plate, the upper end of the rotating shaft is connected with an output shaft of the stirring motor, the lower end of the rotating shaft is vertically inserted into the inner barrel, and the blades are fixed on the rotating shaft;

the wall scraping mechanism comprises a limiting block, an inserting block, a connecting rod and a scraping plate, wherein an annular groove is formed in the circumferential surface of the supporting cylinder, the upper end of the scraping plate is inserted into the annular groove and is in sliding fit with the annular groove, the lower end of the scraping plate extends into the inner cylinder and is in contact with the inner wall of the inner cylinder, the limiting block is fixed on the scraping plate, a jack is formed in the bottom of the limiting block, one end of the connecting rod is connected to the rotating shaft, the other end of the connecting rod is connected with the inserting block, and the inserting block is inserted into the jack in the upward movement process of the inner cylinder so that the scraping plate can coaxially rotate along with the rotating shaft;

the outer tube is located the inner tube below, the outer tube is fixed the urceolus with on the clamp sleeve, the outer tube upper end is located the urceolus, and the lower extreme passes the urceolus in proper order and presss from both sides the cover and downwardly extending, the inner tube is inserted and is established in the outer tube and the upper end with the inner tube bottom is connected, the through-hole has all been seted up to the relative both sides of inner tube, through-hole department is fixed with and is used for sealing the flexible gasket of through-hole, clamping mechanism fixes just be located the relative both sides of outer tube in the urceolus, clamping mechanism is used for passing insert behind the outer tube in the through-hole, so that the inner tube passes through relative both sides the flexible gasket presss from both sides closely and seals.

More preferably: clamping mechanism is located in the urceolus and be in the inner tube below, clamping mechanism includes the fixed plate, inserts post, deflector and spring, the fixed plate is fixed the urceolus bottom, the deflector is fixed the fixed plate with between the outer tube, it is in to insert post sliding connection the deflector, spring coupling be in the fixed plate with insert between the post, insert post one end with spring coupling, the other end is used for passing follow behind the outer tube the through-hole inserts in the inner tube.

More preferably: the reaction kettle is connected with a finished product tank and a waste bucket through an outer pipe pipeline, a first valve is arranged on a pipeline connecting the reaction kettle and the finished product tank, and a second valve is arranged on a pipeline connecting the reaction kettle and the waste bucket;

be provided with the filter screen on the waste bin, stir material mechanism and vibration mechanism, the filter screen sets up and fixes for the slope in the waste bin, it is used for stirring to stir material mechanism material in the waste bin, vibration mechanism installs it just is used for the drive to stir in the material mechanism the filter screen vibrates from top to bottom.

In conclusion, the invention has the following beneficial effects: according to the invention, organic isocyanate, polyester polyol and hydroxyalkyl acrylate are taken as reactants, a polymerization inhibitor and a catalyst are used as auxiliary materials, the prepared aliphatic polyurethane UV resin has low viscosity, is easy to disperse, does not need to be diluted by adding an organic solvent, has high solid content, and has the advantages of high hardness, high curing speed, high fullness of a paint film and good water boiling resistance.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment, which is mainly used for embodying the internal structure of a reaction kettle;

FIG. 2 is a schematic view, partly in section, of an embodiment, mainly used for embodying the matching structure among the clamping mechanism, the outer tube and the inner tube;

FIG. 3 is a schematic cross-sectional view of an embodiment, primarily for embodying a mounting structure for a flexible sealing sheet;

FIG. 4 is a schematic side view of an embodiment, primarily for embodying the structure of the inner tube;

FIG. 5 is a schematic cross-sectional view of an embodiment, primarily for embodying the structure of the clamping mechanism;

FIG. 6 is a schematic partial cross-sectional view of an embodiment, mainly used for embodying the structure of the wall scraping mechanism and the stirring mechanism;

FIG. 7 is a schematic sectional view of an embodiment, mainly used for embodying the structure of the squeegee;

FIG. 8 is a schematic sectional view of an embodiment, which is mainly used for embodying the structure of the waste bucket;

FIG. 9 is a schematic cross-sectional view of an embodiment, primarily for embodying the structure of the vibration mechanism;

fig. 10 is a schematic sectional view of the embodiment, mainly for embodying the connecting structure of the cam.

In the figure, 1, a jacket; 2. an outer cylinder; 3. an inner barrel; 4. a support cylinder; 5. a top cover; 61. a limiting block; 62. inserting a block; 63. a connecting rod; 64. a squeegee; 65. a jack; 66. a fixed part; 71. a stirring motor; 72. a rotating shaft; 73. a paddle; 74. a support bar; 81. a fixing plate; 82. inserting a column; 83. a guide plate; 84. a spring; 85. a tapered portion; 9. an outer tube; 10. an inner tube; 11. a support leg; 12. a cylinder; 13. a thermal medium inlet; 14. a vent hole; 15. a feed hopper; 16. a feed pipe; 17. a thermal medium outlet; 18. a support plate; 19. a support ring; 20. a flexible sealing sheet; 21. a through hole; 22. a chute; 23. a ring groove; 24. a flange; 25. a finished product tank; 26. a waste bin; 27. the coating enters the tube; 28. a waste inlet pipe; 29. a first valve; 30. a second valve; 31. a coating outlet; 32. a waste outlet; 33. an impurity outlet; 34. filtering with a screen; 351. a material stirring motor; 352. a main shaft; 353. a stirring paddle; 361. a worm; 362. a worm gear; 363. a rotating shaft; 364. a cam.

Detailed Description

The invention is described in detail below with reference to the figures and examples.

Example 1: the aliphatic polyurethane UV resin is prepared by mixing organic isocyanate and polyester polyol for reaction and then carrying out end-capping reaction with hydroxyalkyl acrylate.

Preferably, when the product obtained by mixing and reacting the organic isocyanate and the polyester polyol reacts with the hydroxyalkyl acrylate, a polymerization inhibitor and a catalyst are added, and the dosage of the polymerization inhibitor and the catalyst is 0.1 percent of the total amount of the organic isocyanate, the polyester polyol and the hydroxyalkyl acrylate.

Preferably, the polymerization inhibitor is one or two of p-hydroxyanisole and 2, 6-di-tert-butyl-p-cresol. Specifically, in this example, the polymerization inhibitor was p-hydroxyanisole.

Preferably, the catalyst is dibutyltin dilaurate.

Preferably, the organic isocyanate is one or more of toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate and isophorone diisocyanate. Specifically, in this example, the organic isocyanate was toluene diisocyanate.

Preferably, in the mixing reaction process of the organic isocyanate and the polyester polyol, the molar ratio of the polyester polyol to the organic isocyanate is 1: 1.7, the reaction temperature is 75 ℃.

Preferably, the polyester polyol is one or more of adipic acid type polyester polyol, polycaprolactone polyol and polycarbonate polyol. Specifically, in this example, the polyester polyol is an adipic acid type polyester polyol.

Preferably, the molar ratio of isocyanate groups contained in the product obtained after the mixing reaction of the organic isocyanate and the polyester polyol to hydroxyl groups contained in the hydroxyalkyl acrylate is 1: 2.

the preparation method of the aliphatic polyurethane UV resin comprises the following steps:

adding organic isocyanate into a reaction kettle, starting stirring, controlling the temperature of a reactor to be 75 ℃, and then adding polyester polyol for reaction until the NCO content of a reaction system reaches +/-0.8% of a theoretical value; uniformly mixing a polymerization inhibitor and hydroxyalkyl acrylate in advance, adding the mixture into a reaction kettle, uniformly stirring, adding a catalyst, and finishing the reaction when the NCO content in a reaction system is less than or equal to 0.5%; the consumption of the polymerization inhibitor and the catalyst is 0.1 percent of the total amount of the organic isocyanate, the polyester polyol and the hydroxyalkyl acrylate.

In the technical scheme, the aliphatic polyurethane UV resin prepared by using the organic isocyanate, the polyester polyol and the hydroxyalkyl acrylate as reactants and the polymerization inhibitor and the catalyst as auxiliary materials has the advantages of low viscosity, easy dispersion, no need of adding an organic solvent for dilution, high solid content, high hardness of the obtained paint film, high curing speed, high fullness of the paint film and good water boiling resistance.

Referring to fig. 1 to 7, the reaction kettle comprises a jacket 1, an outer cylinder 2, an inner cylinder 3, a supporting cylinder 4, a top cover 5, a wall scraping mechanism, a stirring mechanism, a clamping mechanism, an outer pipe 9, an inner pipe 10, a cylinder 12, a feeding pipe 16, a supporting leg 11, a supporting plate 18 and a flexible sealing sheet 20. The jacket 1, the outer cylinder 2 and the inner cylinder 3 are sequentially arranged from outside to inside, the outer cylinder 2 and the inner cylinder 3 are both cylindrical, the inner diameter of the outer cylinder 2 is the same as the outer diameter of the inner cylinder 3, and the inner cylinder 3 is used for storing materials. The legs 11 are fixed on two opposite sides of the bottom of the jacket 1 so as to support the whole reaction kettle on the ground or a base plane. The jacket 1 covers the surface of the outer cylinder 2, and the jacket 1 is provided with a heat medium inlet 13 and a heat medium outlet 17 for the inlet and the outlet of a heating medium. The heat medium inlet 13 is positioned at one side of the lower part of the jacket 1, the heat medium outlet 17 is positioned at one side of the upper part of the jacket 1, and the heat medium is high-temperature gas or steam. The top cap 5 is fixed at urceolus 2 top, and a support section of thick bamboo 4 is located urceolus 2 and the upper end is fixed on top cap 5, and a support section of thick bamboo 4 external diameter is less than 3 internal diameters of inner tube, and a support section of thick bamboo 4, urceolus 2 and 3 center pins of inner tube all are in same vertical line. The upper end of the feeding pipe 16 is connected with a feeding hopper 15, the lower end of the feeding pipe sequentially penetrates through the top cover 5 and the supporting plate 18, and the feeding hopper 15 is positioned above the top cover 5.

Referring to fig. 1-7, the supporting plate 18 is located in the supporting cylinder 4 and is in sliding fit with the supporting cylinder 4 up and down, preferably, the sliding grooves 22 are formed in two opposite sides of the inner wall of the sleeve, the sliding grooves 22 are vertically arranged, and the supporting plate 18 is embedded in the sliding grooves 22 and is in sliding fit with the sliding grooves 22 up and down. The bottom of the support cylinder 4 is provided with a ring of flanges 24 for supporting the support plate 18 to prevent the support plate 18 from falling off the support cylinder 4. The stirring mechanism is arranged on the supporting plate 18, the air cylinder 12 is used for driving the inner cylinder 3, the stirring mechanism and the supporting plate 18 to move up and down so that the inner cylinder 3 moves up between the outer cylinder 2 and the supporting cylinder 4, and the supporting plate 18 moves up and down in the supporting cylinder 4. The stirring mechanism includes a stirring motor 71, a rotating shaft 72, a paddle 73, and a support rod 74. The stirring motor 71 is positioned in the supporting cylinder 4 and is arranged in the center of the top of the supporting plate 18, the upper end of the rotating shaft 72 is connected with an output shaft of the stirring motor 71, and the lower end of the rotating shaft is vertically inserted into the inner cylinder 3. The blades 73 are positioned in the inner barrel 3 and fixed in the axial direction of the rotating shaft 72, and the blades 73 are inclined blade type blades 73. Two support rods 74 are arranged, the two support rods 74 are respectively and symmetrically arranged on two sides of the lower end of the rotating shaft 72, the upper end of each support rod 74 is fixed with the rotating shaft 72, and the lower end of each support rod extends in the direction away from the rotating shaft 72. The inner bottom surface of the inner cylinder 3 is provided with a circle of groove, the center of the groove is positioned on the axial line of the rotating shaft 72 and the inner cylinder 3, and the lower end of the support rod 74 is inserted in the groove and slides with the groove.

Referring to fig. 1 to 7, the wall scraping mechanism includes a stopper 61, an insertion block 62, a connection rod 63, and a scraper 64. The circumferential surface of the supporting cylinder 4 is provided with a ring of ring grooves 23, and the circle center of the ring grooves 23 is positioned on the axis of the central shaft of the supporting cylinder 4. The scraping plate 64 is positioned between the support cylinder 4 and the outer cylinder 2, the upper end of the scraping plate 64 is integrally provided with a fixing part 66, the fixing part 66 is inserted in the ring groove 23 and is in sliding fit with the ring groove 23, and the lower end of the scraping plate 64 extends into the inner cylinder 3 and is contacted with the upper part of the side wall of the inner cylinder 3. The limiting block 61 is fixed on the scraper 64, the bottom of the limiting block 61 is provided with an insertion hole 65 for the insertion block 62 to insert upwards, one end of the connecting rod 63 is connected to the rotating shaft 72, and the other end of the connecting rod is connected with the insertion block 62. During the upward movement of the inner cylinder 3, the insertion block 62 is inserted into the insertion hole 65, so that the scraper 64 rotates coaxially with the rotating shaft 72. Preferably, one side of the scraping plate 64 close to the inner wall of the inner cylinder 3 is arc-shaped, and the radian of the arc-shaped scraping plate is matched with the inner surface of the inner cylinder 3, so that the scraping plate 64 is tightly attached to the inner wall of the inner cylinder 3. The front side of the scraper 64 in its direction of rotation is beveled to scrape off the contents of the reactor.

Referring to fig. 1 to 7, an outer tube 9 is positioned below the inner tube 3 and fixed on the outer tube 2 and the jacket 1, the upper end of the outer tube 9 is positioned in the outer tube 2, the lower end of the outer tube 9 sequentially penetrates through the outer tube 2 and the jacket 1 and vertically extends downwards, and an inner tube 10 is inserted in the outer tube 9 and the upper end of the inner tube is connected with the center of the bottom of the inner tube 3. The inner bottom surface of the inner cylinder 3 is sunken downwards to be elliptical, a circle of support ring 19 for supporting the inner cylinder 3 is fixed on the inner wall of the inner cylinder 3, and the support ring 19 is positioned below the inner cylinder 3. The side wall and the bottom of the outer cylinder 2 are both provided with vent holes 14 for communicating the inner cylinder 3 and the outer cylinder 2, and the vent holes 14 are positioned below the support ring 19. The arrangement of the vent holes 14 enables the lower part of the inner cylinder 3 to be fully distributed with a heat medium, so that the inner cylinder 3 is heated uniformly. Circular through-hole 21 has all been seted up to the relative both sides of inner tube 10, and through-hole 21 department is fixed with flexible gasket 20 that is used for sealed through-hole 21, and flexible gasket 20 has better elasticity, and is made by materials such as silica gel, flexible rubber best. The two flexible sealing sheets 20 on two opposite sides of the inner tube 10 are both arc-shaped and both concave towards the inside of the inner tube 10. The level of the top surface of the outer tube 9 is the same as the level of the top surface of the support ring 19, and the outer diameter of the inner tube 10 is the same as the inner diameter of the outer tube 9.

Referring to fig. 1 to 7, a through hole is formed in the outer tube 2 at a position corresponding to the through hole 21, a clamping mechanism is fixed in the outer tube 2 and located outside two opposite sides of the outer tube 9, and the clamping mechanism is inserted into the through hole 21 after passing through the outer tube 9 from two sides of the outer tube 9, so that the inner tube 10 is clamped and sealed by the flexible sealing sheets 20 at two opposite sides. The clamping mechanism is located in the outer cylinder 2 and below the inner cylinder 3, and includes a fixing plate 81, an insertion post 82, a guide plate 83, and a spring 84. The fixing plate 81 is fixed at the bottom inside the outer cylinder 2, the guide plate 83 is fixed between the fixing plate 81 and the outer tube 9, and the insertion column 82 is slidably connected to the guide plate 83, specifically, the insertion column 82 slides along the connecting line direction of the fixing plate 81 and the outer tube 9. One end of the spring 84 is fixed with the fixing plate 81, the other end of the spring 84 is fixed with the inserting column 82, one end of the inserting column 82 is connected with the spring 84, and the other end of the inserting column 82 is inserted into the inner tube 10 from the through hole 21 after penetrating through the through hole of the outer tube 9, so that the two flexible sealing sheets 20 are clamped by the inserting columns 82 on the two sides, and the inner tube 10 is sealed. The insertion column 82 is provided with a tapered portion 85 at a side away from the spring 84 for contacting with the flexible sealing sheet 20, so that when the inner tube 10 moves up and down in the outer tube 9, the insertion column 82 can move towards the spring 84, thereby opening the inner tube 10 and facilitating the outflow of the material through the inner tube 10 and the outer tube 9. The cylinder 12 is arranged below the jacket 1, the cylinder 12 comprises a piston rod, the piston rod of the cylinder 12 extends into the outer cylinder 2 from bottom to top, and the upper end of the piston rod of the cylinder 12 is fixed with the bottom of the inner cylinder 3.

In the technical scheme, after the materials completely react in the reaction kettle, more materials are adhered to the inner wall of the reaction kettle, so that the reaction kettle is troublesome to clean, the discharged material quantity is reduced, and the quality loss is more; in addition, the discharge of materials is generally controlled through a plug and a manual valve at the outlet of the traditional reaction kettle, the plug is sealed, is easy to leak and take off, and needs to be manually opened and closed, so that the operation is troublesome, and the manual valve also needs to be manually opened and closed. In order to overcome the defect, the novel reaction kettle is designed, automatic blanking can be realized, the wall can be scraped in the blanking process, so that materials adhered to the inner wall of the reaction kettle can be automatically discharged along with the materials in the blanking process, the quality loss is reduced, and the materials on the inner wall of the reaction kettle can be easily discharged when the materials are scraped due to certain viscosity.

The use process and principle are as follows: when the material reaction completely needs blanking, the air cylinder 12 is started, at this time, the inner cylinder 3, the inner tube 10, the supporting plate 18, the stirring motor 71, the rotating shaft 72, the paddle 73, the inserting block 62 and the connecting rod 63 move upwards, during the upward movement of the inner tube 10, the inserting column 82 moves towards the direction of the spring 84, so as to be separated from the through hole 21, at this time, the inner tube 10 is opened, and the material in the inner cylinder 3 is discharged outwards through the inner tube 10 and the outer tube 9. Along with the upward movement of the insertion block 62 and the connecting rod 63, the insertion block 62 is inserted into the insertion hole 65, the lower end of the scraper 64 is close to the inner bottom surface of the inner cylinder 3 at the moment, the air cylinder 12 stops running, and the stirring motor 71 is started at the same time, so that the insertion block 62, the connecting rod 63, the limiting block 61, the scraper 64 and the like rotate coaxially along with the rotating shaft 72, and in the rotating process of the scraper 64 on the inner wall of the inner cylinder 3, materials adhered to the inner wall of the inner cylinder 3 are scraped off, so that the materials adhered to the inner wall of the inner cylinder 3 can be discharged through the inner tube 10, material residue is reduced, and great material loss is avoided.

Referring to fig. 1 to 10, a paint inlet pipe 27 and a waste inlet pipe 28 are connected to the outer pipe 9, respectively, and the reaction kettle is connected to the finished product tank 25 through the paint inlet pipe 27 and to the waste bucket 26 through the waste inlet pipe 28. The first valve 29 is installed on the paint inlet pipe 27, the second valve 30 is installed on the waste inlet pipe 28, and in step S2, when the aliphatic polyurethane UV resin is detected to be qualified, the first valve 29 is opened, and the second valve 30 is closed, so that the qualified aliphatic polyurethane UV resin enters the finished product tank 25 for storage; when the detection of the aliphatic polyurethane UV resin is unqualified, namely the prepared aliphatic polyurethane UV resin does not meet various indexes (solid content, viscosity and the like) of the required aliphatic polyurethane UV resin, the second valve 30 is opened, and the first valve 29 is closed, so that the qualified aliphatic polyurethane UV resin enters the waste material barrel 26 for storage. In addition, when the reaction kettle needs to be cleaned, the materials in the reaction kettle can also enter the waste material barrel 26 through the waste material inlet pipe 28 to be collected.

Referring to fig. 1-10, the waste bin 26 is provided with a screen 34, a material stirring mechanism and a vibrating mechanism. The filter screen 34 is obliquely arranged and fixed in the waste bucket 26, the waste material inlet pipe 28 is connected with one side of the upper part of the waste bucket 26, and the joint of the waste material inlet pipe 28 and the waste bucket 26 is positioned above the higher horizontal side of the filter screen 34. The stirring mechanism is used for stirring the materials in the waste material barrel 26, and specifically, the stirring mechanism comprises a stirring motor 351, a main shaft 352 and a stirring paddle 353. Stirring material motor 351 is installed above the top of waste bin 26, and main shaft 352 is vertical setting and the upper end is fixed with stirring material motor 351 output shaft, and the lower extreme stretches into waste bin 26 and passes filter screen 34 downwards. The paddle 353 is fixed to the main shaft 352 and is used for stirring the material in the waste material barrel 26 so as to prevent the material from being agglomerated, and the paddle 353 is an inclined blade and is located below the filter screen 34. A coating outlet 31 is formed in one side of the lower portion of the finished product tank 25, a waste outlet 32 is formed in one side of the lower portion of the waste barrel 26, an impurity outlet 33 is further formed in the side portion of the waste barrel 26, and the impurity outlet 33 is located on the lowest side of the horizontal height of the filter screen 34.

In the above technical solution, since there may be coagulum, solid particles, etc. in the waste material, the present invention is provided with the inclined screen 34 in the waste material barrel 26. The waste material enters the waste bin 26 and is filtered by a screen 34 to allow the agglomerates, solid particles, etc. to exit through the contaminant outlet 33. In order to prevent the waste materials from being condensed in the waste material barrel 26, the invention is also provided with a material stirring mechanism, when the material stirring motor 351 is started, the main shaft 352 drives the stirring paddle 353 to rotate, so that the waste materials can be stirred.

Referring to fig. 1-10, the vibrating mechanism is mounted on the stirring mechanism and used for driving the filter screen 34 to vibrate up and down, and the vibrating mechanism is located below the filter screen 34, and preferably, the vibrating mechanism comprises a worm 361, a worm wheel 362, a rotating shaft 363 and a cam 364. The worm 361 is fixed on the main shaft 352, and the central axis of the worm 361 and the central axis of the main shaft 352 are on the same vertical line. The worm wheel 362 is located on one side of the worm 361 and meshed with the worm 361, the rotating shaft 363 is horizontally arranged, and two ends of the rotating shaft 363 are respectively inserted into the inner wall of the waste material barrel 26, so that the rotating shaft 363 is in rotating fit with the waste material barrel 26. The worm wheel 362 is sleeved on the rotating shaft 363 and fixedly connected with the rotating shaft 363, so that the rotating shaft 363 coaxially rotates with the worm wheel 362, a plurality of cams 364 are arranged, and the plurality of cams 364 are axially arranged along the rotating shaft 363. The cam 364 is a disk cam and is located below the screen 34, and a circumferential arc surface of the cam 364 contacts with a bottom surface of the screen 34.

In the above technical scheme, when the material stirring motor 351 is started, the main shaft 352 drives the stirring paddle 353 and the worm 361 to rotate, and the worm 361 is meshed with the worm wheel 362, so that when the worm 361 rotates, the worm wheel 362 drives the rotating shaft 363 and the cam 364 to synchronously rotate, and because the arc surface of the cam 364 in the circumferential direction is in contact with the bottom surface of the filter screen 34, the filter screen 34 vibrates up and down in the rotating process of the cam 364, so that the filtering effect is improved, and the blockage of the filter screen 34 is reduced.

Example 2: an aliphatic polyurethane UV resin and a preparation method thereof are different from the embodiment 1 in that a polymerization inhibitor is 2, 6-di-tert-butyl-p-cresol; the organic isocyanate is diphenylmethane diisocyanate; the polyester polyol is polycarbonate polyol; the molar ratio of isocyanate groups contained in the product obtained after the mixing reaction of the organic isocyanate and the polyester polyol to hydroxyl groups contained in the hydroxyalkyl acrylate is 1: 1; in the mixing reaction process of the organic isocyanate and the polyester polyol, the molar ratio of the polyester polyol to the organic isocyanate is 1: 2.5, the reaction temperature is 95 ℃.

Example 3: an aliphatic polyurethane UV resin and a preparation method thereof are different from the embodiment 1 in that in the mixing reaction process of organic isocyanate and polyester polyol, the molar ratio of the polyester polyol to the organic isocyanate is 1: 1.5, the reaction temperature is 60 ℃.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that several improvements and modifications without departing from the principle of the present invention will occur to those skilled in the art, and such improvements and modifications should also be construed as within the scope of the present invention.