Preparation method and equipment of lignin bio-based polyurethane foam joint mixture

Abstract

The invention discloses a lignin bio-based polyurethane foam caulking agent preparation method and equipment, the method comprises the first step of raw material preparation, the second step of raw material proportioning and the third step of stirring and mixing, a mixing tank comprises a tank body, a top cover is fixed to the middle of the top end of the tank body, folding plates are hinged to the two sides of the top cover, and the folding plates are fixed to the top end of the tank body. The device comprises a top cover, a driving motor is fixed to the top end of the top cover, a driving shaft is connected to the bottom end of the driving motor, a square block is fixed to the outer side of the driving shaft, and stirring plates are fixed to the two sides of the square block. The expanded graphite, the high-temperature-resistant polystyrene foam and the aluminum hydroxide can be used for flame retardance and smoke abatement, the expanded graphite and the aluminum hydroxide can well improve the flame retardance of the joint mixture, the adhesive force between polyurethane foam and particles can be improved by adding the high-temperature-resistant polystyrene foam, and meanwhile the joint mixture further has multiple functions of sound insulation, heat insulation, heat preservation and the like.

Description

Technical Field

[0001] The invention relates to the field of polyurethane foam, and in particular to a method and equipment for preparing a lignin bio-based polyurethane foam sealant. Background Art

[0002] As a building material, polyurethane foam sealant has the effects of caulking, bonding, sealing, and sound absorption. It is widely used in sealing, plugging leaks, or waterproofing between plastic steel or aluminum alloy doors and windows and walls. The raw materials for making polyurethane foam are mainly isocyanate, polyols and other additives. Isocyanate and polyols mainly come from the petrochemical industry. At present, due to the shortage of fossil resources and the negative impact of industrial production of synthetic polyols on the environment, seeking renewable resources to partially or completely replace petroleum-based polyols has become the key to the current research on the sustainable development of polyurethane materials. Flame retardants are often added to the preparation of polyurethane foam sealants to improve the flame retardant properties of rigid polyurethane.

[0003] The existing cyanate esters and polyols mainly come from the petrochemical industry. The cost of the derivative products of the petrochemical industry is gradually rising with the depletion of energy. In addition, the mechanical strength of the foam sealant is relatively low after spraying and filling the joints.

[0004] Therefore, it is necessary to propose a method and equipment for preparing a lignin bio-based polyurethane foam sealant to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a method and equipment for preparing a lignin bio-based polyurethane foam sealant to solve the problem that the existing cost is gradually increasing and the mechanical strength of the foam sealant itself is low after spraying and sealing.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for preparing a lignin bio-based polyurethane foam sealant, comprising the following steps:

[0007] Step 1: Prepare raw materials: prepare combined polyether, polyisocyanate, thickener, catalyst, iron oxide, diluent and flame retardant respectively, and place them in different barrels for sealed storage;

[0008] Step 2, raw material ratio: according to the mass components, take out 25%-30% of combined polyether, 30%-45% of polyisocyanate, 0.5%-1% of thickener, 0.5%-1% of catalyst, 0.05%-0.08% of iron oxide, 20%-25% of diluent and 2%-3% of flame retardant from each barrel, and place the taken out polyisocyanate, thickener and catalyst in a mixing tank;

[0009] Step 3: Stirring and mixing: Stir the polyisocyanate, thickener and catalyst in a mixing tank at room temperature. After mixing evenly, add the diluent and stir thoroughly. After stirring, add iron oxide to adjust the color. Finally, add the flame retardant and mix evenly.

[0010] The flame retardant is made of expanded graphite, high temperature resistant foamed rubber and aluminum hydroxide particles, and the expanded graphite, high temperature resistant foamed rubber and aluminum hydroxide particles are mixed in a ratio of 1:1:2;

[0011] Wherein, the diluent is any one or more of toluene and styrene, and the thickener is xanthan gum;

[0012] The composite polyether comprises polyether polyol, lignin-based polyol, polyester polyol, chlorinated paraffin, catalyst, and diethylenetriamine, and the mass of polyether polyol, lignin-based polyol, polyester polyol, chlorinated paraffin, catalyst, and diethylenetriamine is mixed in a ratio of 10:5:8:1.5:1;

[0013] The mixing tank includes a tank body, a top cover is fixed to the middle of the top of the tank body, folding plates are hinged on both sides of the top cover, a driving motor is fixed to the top of the top cover, a driving shaft is connected to the bottom end of the driving motor, a block is fixed to the outside of the driving shaft, stirring plates are fixed to both sides of the block, connecting frames are fixed to the other two sides of the block, vertical plates are fixed to the sides of the connecting frames away from each other, the sides of the two vertical plates away from each other are both in contact with the inner wall of the tank body, scrapers are telescopically arranged on one side of the two vertical plates, and the scrapers are set to the same height as the tank body.

[0014] A shell is clamped on the connecting frame, a vibration rod is fixed on the outside of the shell, a vibration motor is fixed inside the shell, clamping blocks are fixed on both sides of the bottom of the shell, a clamping slot for clamping the clamping block is provided on the top of the shell, an inner cavity is provided inside the connecting frame, a power supply is provided inside the inner cavity, the vibration motor and the power supply are connected by wires, and multiple shells are provided, and the multiple shells are distributed along the height direction of the connecting frame.

[0015] A groove is provided on one side of the vertical plate, a spring is fixed inside the groove, the scraper is fixed to one end of the spring, one side of the scraper extends out of the groove, and the outer side of the scraper is in contact with the inner wall of the groove.

[0016] The drive shaft extends into the interior of the tank body, and an inclined plate is fixed on one side of the two stirring plates. The two inclined plates are distributed with a downward inclination, and the two inclined plates are distributed equidistantly around the center of the drive shaft. There are multiple blocks, and the multiple blocks are distributed along the height of the drive shaft.

[0017] A cavity is provided between the outer side and the inner wall of the tank body. An electric heating tube is arranged in the cavity. The electric heating tube is wound around the outer side of the tank body.

[0018] The bottom end of the tank body is provided with an output port, and the output port is communicated with the interior of the tank body.

[0019] An input port is provided on one side of the top end of the top cover, and a plurality of support columns are fixed on the outer side of the tank body.

[0020] The two folding plates and the top cover are combined into a circular shape and are completely covered on the top of the tank body.

[0021] The output port is provided with a control valve.

[0022] The invention also discloses a polyurethane foam sealant, which is prepared by using a preparation method of a lignin bio-based polyurethane foam sealant.

[0023] Beneficial technical effects and advantages of the present invention:

[0024] Lignin is a renewable resource. The benzene ring structure contained in the lignin structure can enhance the strength and heat resistance of the foam. The hydroxyl group contained in the lignin structure can participate in the synthesis of polyurethane foam and can replace part of the polyols to participate in the reaction. When flame retardants are added to the lignin bio-based polyurethane foam sealant, expanded graphite, high temperature resistant foam glue and aluminum hydroxide can all be used for flame retardant and smoke elimination. Expanded graphite and aluminum hydroxide can well improve the flame retardant properties of the sealant. By adding high temperature resistant foam glue, the adhesion between polyurethane foam and particles can be improved. At the same time, it also has multiple functions such as sound insulation, heat insulation, and thermal insulation, thereby improving the functionality of use.

[0025] During the stirring process, when the mixed raw materials adhere to the inner wall of the tank, the rotation of the driving shaft can drive the vertical plate and the scraper to move along the inner wall of the tank, thereby scraping off the raw materials adhered to the inner wall of the tank. When the scraper contacts the raw materials, resistance will be generated, and the resistance will cause the scraper to retract into the inside of the groove. The raw materials adhered to the outside of the scraper itself will be removed through the obstruction of the groove, thereby cleaning the raw materials on the scraper. At the same time, when there are more raw materials on the inner wall and the resistance generated is greater, the elastic force of the spring can play a buffering role and increase the service life.

[0026] During stirring, the vibration motor is started to generate vibration, and the vibration is transmitted to the connecting frame and the scraper, so that the raw materials adhering to the scraper can be shaken off by the vibration. At the same time, the vibration is also transmitted to the stirring plate, causing the raw materials to shake and fall. Furthermore, the vibration generated by the vibration motor is transmitted to the vibration rod. During stirring, the vibration will extend into the interior of the raw material through the vibration rod. Through vibration, the mixing uniformity of the raw materials can be accelerated. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a schematic flow chart of the method for preparing the lignin bio-based polyurethane foam sealant.

[0028] Figure 2 This is a schematic diagram of the structure of the tank body of the equipment for preparing the lignin bio-based polyurethane foam sealant of the present invention.

[0029] Figure 3 It is a schematic diagram of the internal structure of the tank body of the present invention.

[0030] Figure 4 It is a schematic diagram of the structure of the electric heating tube of the present invention.

[0031] Figure 5 For the present invention Figure 3 Enlarged schematic diagram at point A in the middle.

[0032] Figure 6 It is a schematic diagram of the groove cross-section structure of the present invention.

[0033] Figure 7 It is a schematic diagram of the cross-sectional structure of the power supply and inner cavity of the present invention.

[0034] In the figure: 1. tank body; 2. support column; 3. top cover; 4. folding plate; 5. driving motor; 6. input port; 7. vertical plate; 8. electric heating tube; 9. driving shaft; 10. outer shell; 11. vibrating rod; 12. stirring plate; 13. inclined plate; 14. groove; 15. spring; 16. scraper; 17. output port; 18. connecting frame; 19. block; 20. power supply; 21. inner cavity; 22. block. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] like Figure 1 - Figure 7 The present invention provides a method for preparing a lignin bio-based polyurethane foam sealant.

[0037] Example 1

[0038] It includes the following steps:

[0039] S1. Prepare raw materials: prepare combined polyether, polyisocyanate, thickener, catalyst, iron oxide, diluent and flame retardant respectively, and place them in different barrels for sealed storage;

[0040] S2. Raw material ratio: according to the mass components, take out 25% of the combined polyether, 45% of the polyisocyanate, 0.5% of the thickener, 1% of the catalyst, 0.08% of the iron oxide, 25% of the diluent and 3% of the flame retardant from each barrel, and place the taken out polyisocyanate, thickener and catalyst in a mixing tank;

[0041] S3, stirring and mixing: using a mixing tank to stir the polyisocyanate, thickener, and catalyst at room temperature, after mixing evenly, adding a diluent and stirring thoroughly, adding iron oxide after stirring to adjust the color, and finally adding a flame retardant and mixing evenly;

[0042] The flame retardant is made of expanded graphite, high temperature resistant foamed rubber and aluminum hydroxide particles, and the expanded graphite, high temperature resistant foamed rubber and aluminum hydroxide particles are mixed in a ratio of 1:1:2;

[0043] Wherein, the diluent is any one or more of toluene and styrene, and the thickener is xanthan gum;

[0044] Example 2

[0045] S1. Prepare raw materials: prepare combined polyether, polyisocyanate, thickener, catalyst, iron oxide, diluent and flame retardant respectively, and place them in different barrels for sealed storage;

[0046] S2. Raw material ratio: according to the mass components: take out 30% of combined polyether, 40% of polyisocyanate, 0.5% of thickener, 0.5% of catalyst, 0.08% of oxidant, 25% of diluent and 2%-3% of flame retardant from each barrel, and place the taken out polyisocyanate, thickener and catalyst in a mixing tank;

[0047] S3, stirring and mixing: using a mixing tank to stir the polyisocyanate, thickener, and catalyst at room temperature, after mixing evenly, adding a diluent and stirring thoroughly, adding iron oxide after stirring to adjust the color, and finally adding a flame retardant and mixing evenly;

[0048] Among them, the combined polyether includes polyether polyol, lignin-based polyol, polyester polyol, chlorinated paraffin, catalyst, and diethylenetriamine, and the mass of polyether polyol, lignin-based polyol, polyester polyol, chlorinated paraffin, catalyst, and diethylenetriamine is mixed in a ratio of 10:5:8:1.5:1.

[0049] Example 3

[0050] S1. Prepare raw materials: prepare combined polyether, polyisocyanate, thickener, catalyst, iron oxide, diluent and flame retardant respectively, and place them in different barrels for sealed storage;

[0051] S2. Raw material ratio: according to the mass components, take: 27% of combined polyether, 43% of polyisocyanate, 1% of thickener, 1% of catalyst, 0.06% of iron oxide, 25% of diluent and 3% of flame retardant, and place the taken polyisocyanate, thickener and catalyst in a mixing tank;

[0052] S3, stirring and mixing: using a mixing tank to stir the polyisocyanate, thickener, and catalyst at room temperature, after mixing evenly, adding a diluent and stirring thoroughly, adding iron oxide after stirring to adjust the color, and finally adding a flame retardant and mixing evenly;

[0053] The flame retardant is made of expanded graphite, high temperature resistant foamed rubber and aluminum hydroxide particles, and the expanded graphite, high temperature resistant foamed rubber and aluminum hydroxide particles are mixed in a ratio of 1:1:2;

[0054] Lignin can be extracted from a variety of plant materials, including but not limited to wood, straw, bark, etc. Since lignin is a renewable resource, the benzene ring structure contained in the lignin structure can enhance the strength and heat resistance of the foam. The hydroxyl groups contained in the lignin structure can participate in the synthesis of polyurethane foam and can replace part of the polyols to participate in the reaction. Therefore, lignin-based polyols are added to the lignin bio-based polyurethane foam sealant.

[0055] When flame retardants are added to lignin bio-based polyurethane foam sealants, expanded graphite, high-temperature resistant foamed rubber and aluminum hydroxide can all be used for flame retardant and smoke suppression. When expanded graphite is subjected to high temperatures above 200°C, the compounds in the interlayer lattice decompose, causing the graphite to expand and form a low-density worm-like structure, thereby creating a good insulation layer. Expanded graphite and aluminum hydroxide can greatly improve the flame retardant properties of the sealant. After the sealant is sprayed out for filling, the expanded graphite and aluminum hydroxide particles can serve as bonding supports between the sealants, which can improve the mechanical strength of the sealant after drying and enhance stability.

[0056] By adding high temperature resistant foaming glue, the adhesion between polyurethane foam and particles can be improved. At the same time, it also has multiple functions such as sound insulation, heat insulation, and thermal insulation, thereby improving the functionality of use.

[0057] like Figure 2-Figure 7As shown, the equipment includes a mixing tank including a tank body 1, a top cover 3 is fixed in the middle of the top of the tank body 1, folding plates 4 are hinged on both sides of the top cover 3, a driving motor 5 is fixed on the top of the top cover 3, and a driving shaft 9 is connected to the bottom end of the driving motor 5, a block 22 is fixed on the outside of the driving shaft 9, stirring plates 12 are fixed on both sides of the block 22, the driving shaft 9 extends into the interior of the tank body 1, and inclined plates 13 are fixed on one side of the two stirring plates 12, the two inclined plates 13 are tilted downward at 45 degrees, and the two inclined plates 13 are equidistantly distributed around the center of the driving shaft 9, and a plurality of blocks 22 are provided, and the plurality of blocks 22 are distributed along the height of the driving shaft 9.

[0058] In the actual operation of the present invention, after a variety of raw materials are input into the mixing tank, the driving motor 5 is started so that the plurality of stirring plates 12 and the tilting plate 13 can stir the various raw materials so that the various raw materials can be fully and evenly mixed.

[0059] The other two sides of the block 22 are fixed with connecting frames 18, and the sides of the connecting frames 18 that are away from each other are fixed with vertical plates 7. The sides of the two vertical plates 7 that are away from each other are both in contact with the inner wall of the tank body 1. A scraper 16 is telescopically provided on one side of the two vertical plates 7. The height of the scraper 16 and the tank body 1 are set to be consistent. A groove 14 is provided on one side of the vertical plate 7, and a spring 15 is fixed inside the groove 14. The scraper 16 is fixed to one end of the spring 15, and one side of the scraper 16 extends out of the groove 14, and the outer side of the scraper 16 is in contact with the inner wall of the groove 14.

[0060] In the actual operation of the present invention, during the stirring process, when the mixed raw materials adhere to the inner wall of the tank body 1, the rotation of the drive shaft 9 can drive the vertical plate 7 and the scraper 16 to move along the inner wall of the tank body 1, thereby scraping off the raw materials adhered to the inner wall of the tank body 1. When the scraper 16 contacts the raw materials, resistance will be generated. The resistance will cause the scraper 16 to retract into the inside of the groove 14. The raw materials adhered to the outside of the scraper 16 itself will be removed through the obstruction of the groove 14, thereby cleaning the raw materials on the scraper 16. At the same time, when there are more raw materials on the inner wall and the resistance generated is larger, the elastic force of the spring 15 can play a buffering role and increase the service life.

[0061] A shell 10 is clamped on the connecting frame 18, a vibration rod 11 is fixed on the outside of the shell 10, a vibration motor is fixed inside the shell 10, clamping blocks 19 are fixed on both sides of the bottom of the shell 10, a slot for clamping the clamping block 19 is provided at the top of the shell 10, an inner cavity 21 is provided inside the connecting frame 18, a power supply 20 is provided inside the inner cavity 21, the vibration motor and the power supply 20 are connected by wires, a plurality of shells 10 are provided, and the plurality of shells 10 are distributed along the height direction of the connecting frame 18.

[0062] In the actual operation of the present invention, during stirring, the vibration motor is started to generate vibration, and the vibration is transmitted to the connecting frame 18 and the scraper 16, so that the raw materials adhered to the scraper 16 can be shaken off by the vibration. At the same time, the vibration will also be transmitted to the stirring plate 12, causing the raw materials to shake and fall. Further, the vibration generated by the vibration motor is transmitted to the vibration rod 11. During stirring, the vibration will extend into the interior of the raw material through the vibration rod 11. Through vibration, the mixing uniformity of the raw materials can be accelerated.

[0063] A cavity is provided between the outer side and the inner wall of the tank body 1, and an electric heating tube 8 is arranged in the cavity. The electric heating tube 8 is wound around the outer side of the tank body 1. When the indoor temperature is low, the raw material will solidify. The electric heating tube 8 can increase the activity of the molecules and reduce the solidification phenomenon.

[0064] An output port 17 is provided at the bottom end of the tank body 1 , and the output port 17 is communicated with the interior of the tank body 1 .

[0065] An input port 6 is provided on one side of the top of the top cover 3, and multiple support columns 2 are fixed to the outside of the tank body 1 for supporting the tank body 1. The two folding plates 4 and the top cover 3 are combined into a circular shape and completely cover the top of the tank body 1. A control valve is provided on the output port 17.

[0066] The invention also discloses a polyurethane foam sealant, which is prepared by the above-mentioned method for preparing the lignin bio-based polyurethane foam sealant.

Claims

1. A method for preparing a lignin bio-based polyurethane foam sealant, Features: The following steps are involved: S1. Prepare raw materials: prepare combined polyether, polyisocyanate, thickener, catalyst, iron oxide, diluent and flame retardant respectively, and place them in different barrels for sealed storage; S2. Raw material ratio: according to the mass components, take: combined polyether 25%-30%, polyisocyanate 30%-45%, thickener 0.5%-1%, catalyst 0.5%-1%, iron oxide 0.05%-0.08%, diluent 20%-25% and flame retardant 2%-3%, and place the taken polyisocyanate, thickener and catalyst in a mixing tank; S3, stirring and mixing: using a mixing tank to stir the polyisocyanate, thickener, and catalyst at room temperature, after mixing evenly, adding a diluent and stirring thoroughly, adding iron oxide after stirring to adjust the color, and finally adding a flame retardant and mixing evenly; The flame retardant is made of expanded graphite, high temperature resistant foamed rubber and aluminum hydroxide particles, and the expanded graphite, high temperature resistant foamed rubber and aluminum hydroxide particles are mixed in a ratio of 1:1:2; Wherein, the diluent is any one or more of toluene and styrene, and the thickener is xanthan gum; Among them, the combined polyether includes polyether polyol, lignin-based polyol, polyester polyol, chlorinated paraffin, catalyst, and diethylenetriamine, and the mass of polyether polyol, lignin-based polyol, polyester polyol, chlorinated paraffin, catalyst, and diethylenetriamine is mixed in a ratio of 10:5:8:1.5:

1.

2. A lignin bio-based polyurethane foam sealant preparation device, Features: The invention comprises a mixing tank and a tank body (1), wherein a top cover (3) is fixed in the middle of the top of the tank body (1), and folding plates (4) are hinged on both sides of the top cover (3), a driving motor (5) is fixed on the top of the top cover (3), and a driving shaft (9) is connected to the bottom end of the driving motor (5), a block (22) is fixed on the outside of the driving shaft (9), stirring plates (12) are fixed on both sides of the block (22), and connecting frames (18) are fixed on the other two sides of the block (22), and vertical plates (7) are fixed on the side of the connecting frame (18) away from each other, and the sides of the two vertical plates (7) away from each other are both in contact with the inner wall of the tank body (1), and scrapers (16) are telescopically arranged on one side of the two vertical plates (7), and the height of the scrapers (16) and the tank body (1) is set to be consistent.

3. The lignin bio-based polyurethane foam sealant preparation device according to claim 2, Features: The connecting frame (18) is clamped with a shell (10), a vibration rod (11) is fixed on the outer side of the shell (10), a vibration motor is fixed inside the shell (10), clamping blocks (19) are fixed on both sides of the bottom of the shell (10), a clamping slot for clamping the clamping block (19) is provided at the top of the shell (10), an inner cavity (21) is provided inside the connecting frame (18), a power supply (20) is provided inside the inner cavity (21), the vibration motor and the power supply (20) are connected by electric wires, a plurality of the shells (10) are provided, and the plurality of the shells (10) are distributed along the height direction of the connecting frame (18).

4. The lignin bio-based polyurethane foam sealant preparation device according to claim 2, Features: A groove (14) is provided on one side of the vertical plate (7), a spring (15) is fixed inside the groove (14), the scraper (16) is fixed to one end of the spring (15), one side of the scraper (16) extends out of the groove (14), and the outer side of the scraper (16) is in contact with the inner wall of the groove (14).

5. The lignin bio-based polyurethane foam sealant preparation device according to claim 2, Features: The driving shaft (9) extends into the interior of the tank body (1); an inclined plate (13) is fixed on one side of each of the two stirring plates (12); the two inclined plates (13) are inclined downward at 45 degrees, and the two inclined plates (13) are equidistantly distributed around the center of the driving shaft (9); a plurality of blocks (22) are provided, and the plurality of blocks (22) are distributed along the height of the driving shaft (9).

6. The lignin bio-based polyurethane foam sealant preparation device according to claim 5, Features: A cavity is provided between the outer side and the inner wall of the tank body (1), an electric heating tube (8) is arranged in the cavity, and the electric heating tube (8) is wound around the outer side of the tank body (1).

7. The lignin bio-based polyurethane foam sealant preparation device according to claim 3, Features: The bottom end of the tank body (1) is provided with an output port (17), and the output port (17) is connected to the interior of the tank body (1).

8. The lignin bio-based polyurethane foam sealant preparation device according to claim 2, Features: An input port (6) is provided on one side of the top end of the top cover (3), and a plurality of support columns (2) are fixed on the outside of the tank body (1).

9. The lignin bio-based polyurethane foam sealant preparation device according to claim 2, Features The two folding plates (4) and the top cover (3) are combined into a circular shape and are completely covered on the top of the tank body (1).

10. The lignin bio-based polyurethane foam sealant preparation device according to claim 2, Features: The output port (17) is provided with a control valve.

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