Polyurethane resin for synthetic leather and preparation device and method thereof

Abstract

The invention relates to the technical field of polyurethane resin, and discloses polyurethane resin for synthetic leather and a preparation device and method.The polyurethane resin comprises a supporting bottom frame, a reaction kettle is fixedly connected to the top of the supporting bottom frame, side supporting frames are fixedly connected to the two sides of the supporting bottom frame, and a motor body is fixedly connected to one side of each side supporting frame; an output shaft of the motor body is fixedly connected with an inner transmission rod, the surface of the inner transmission rod is fixedly connected with a connecting fan, the other side of the inner transmission rod is fixedly connected with an inner connecting rod, one side of the inner connecting rod is fixedly connected with a large transmission fluted disc, and the upper side and the lower side of the large transmission fluted disc are fixedly connected with side transmission rings. By reducing the adhesion degree with release paper and improving the air permeability and degradation performance of resin, ethyl acetate or diisobutyl carbinol is used as a solvent, and diisobutyl carbinol not only can shorten the reaction time and save the preparation time, but also can improve the smell feeling of a final product due to the characteristics of a perfume additive.

Description

Technical Field

[0001] The invention belongs to the technical field of polyurethane resins, and in particular relates to a polyurethane resin for synthetic leather and a preparation device and method thereof. Background Art

[0002] Polyurethane resin for suede release paper surface leather is a special resin designed for the production of synthetic leather with a suede texture surface. In the synthetic leather manufacturing process, this type of resin is used to coat the release paper to form a suede layer. After drying and curing, it is bonded to the base fabric through a specific process to finally obtain an artificial leather product with a suede effect similar to natural leather.

[0003] In the prior art, the patent application document "CN107090719B" discloses "a high-peeling twice-coated knitted polyurethane synthetic leather and a preparation method thereof"; the high-peeling twice-coated knitted polyurethane synthetic leather comprises a knitted fabric base layer, on which a high-polyurethane-content cross-linked foaming coating and a polyurethane wet foaming coating are sequentially coated, and a dry surface layer is provided on the upper surface of the polyurethane wet foaming coating. The present invention coats the base fabric twice and solidifies twice, wherein the first coating slurry is a high-polyurethane-content slurry, and a cross-linking agent is added to the slurry, and the second coating is a normal-polyurethane-content slurry, thereby forming a high-polyurethane-content and cross-linking agent coating combined with the base fabric layer, thereby improving the peeling strength of the product, and the main coating is still a normal coating slurry, thereby ensuring the feel of the product.

[0004] The above-mentioned "a kind of high-peeling double-coated knitted polyurethane synthetic leather and its preparation method" still has some disadvantages, for example: the main disadvantage of the application of polyurethane resin and velvet paper surface release paper currently produced and used in the market is that the finished synthetic leather base and fabric are not easy to be separated from the release paper after being transferred by the release paper, which will cause the release paper to be damaged, reduce the frequency of use of the release paper, and the price of the reused products on the market is high, and the performance of the above-mentioned products still needs to be improved;

[0005] For this reason, a polyurethane resin for synthetic leather and a preparation device and method thereof are proposed to solve the above-mentioned problems. Summary of the invention

[0006] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a polyurethane resin for synthetic leather and a preparation device and method thereof, which effectively solves the main shortcomings of the application of polyurethane resin and velvet paper surface release paper in the current market, that is, after the synthetic leather finished product base and fabric are transferred through the release paper, it is not easy to separate from the release paper, which will cause the release paper to be damaged, reduce the utilization frequency of the release paper, and the price of reused products on the market is relatively high, and the performance of the above-mentioned products still needs to be improved.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a preparation device for polyurethane resin for synthetic leather, comprising a supporting chassis, a reactor is fixedly connected to the top of the supporting chassis, side supporting frames are fixedly connected to the two sides of the supporting chassis, a motor body is fixedly connected to one side of the side supporting frame, an inner transmission rod is fixedly connected to the output shaft of the motor body, a connecting fan is fixedly connected to the surface of the inner transmission rod, an inner connecting rod is fixedly connected to the other side of the inner transmission rod, a large transmission gear disc is fixedly connected to one side of the inner connecting rod, side transmission rings are fixedly connected to the upper and lower sides of the large transmission gear disc, a sliding ring rail is opened on the surface of the reactor, and a top cover is arranged on the top of the reactor.

[0008] The top of the cooling tower is fixedly connected to the cooling tower, and the top of the cooling tower is fixedly connected to the liquid inlet. The surface of the cooling tower is fixedly connected to the cooling fin, and one side of the large transmission gear disk is meshed with a small transmission gear disk, and one side of the small transmission gear disk is fixedly connected to a bottom fixing rod, one end of the bottom fixing rod is fixedly connected to a first bevel gear disk, one side of the No. 1 bevel gear disk is fixedly connected to a bottom support rod, one side of the bottom support rod is movably connected to a bottom bearing disk, one side of the No. 1 bevel gear disk is meshed with a second bevel gear disk, one side of the No. 2 bevel gear disk is fixedly connected to a side transmission rod, one side of the side transmission rod is fixedly connected to a third bevel gear disk, one side of the No. 3 bevel gear disk is meshed with a fourth bevel gear disk, one end of the side transmission rod is movably connected to a side bearing disk, one side of the side bearing disk is movably connected to a side L frame, one side of the No. 4 bevel gear disk is fixedly connected to a bottom connecting rod, and one end of the bottom connecting rod is fixedly connected to a cooling fan.

[0009] Further, a polyurethane resin for synthetic leather includes component A and component B;

[0010] The A component includes the following substances in parts by mass:

[0011] 50-60 parts of diisocyanate;

[0012] 30-40 parts of polyether polyol;

[0013] 10-20 parts of polylactic acid polyol;

[0014] 5-10 parts of polydimethylsiloxane;

[0015] 3-5 parts of polyol;

[0016] 3-5 parts of polyamine;

[0017] Catalyst 0.6~0.7 parts;

[0018] 2~3 parts of additives;

[0019] 80-300 parts of solvent;

[0020] The B component includes the following substances in parts by mass:

[0021] 50-60 parts of diisocyanate;

[0022] 30-40 parts of polyether polyol;

[0023] 6-9 parts of polylactic acid polyol;

[0024] 5-10 parts of polydimethylsiloxane;

[0025] 3-5 parts of polyol;

[0026] 3-5 parts of polyamine;

[0027] Catalyst 0.6~0.7 parts;

[0028] 0.5-1 part of additive;

[0029] 80-300 parts of solvent;

[0030] The catalyst is at least one of urotropine, N-ethylmorpholine and triethanolamine;

[0031] The auxiliary agent is a mixture of sodium bicarbonate, calcium oxide and calcium carbonate.

[0032] Furthermore, the diisocyanate is at least one of dimer diisocyanate (DDI), dicyclohexylmethane diisocyanate (HMDI) and toluene diisocyanate (TDI).

[0033] Furthermore, the relative molecular mass of the polyether polyol is between 1000 and 2000.

[0034] Furthermore, the polyol is ethylene glycol or 1,4-butanediol.

[0035] Furthermore, the polyamine is ethylenediamine or 1,2-cyclohexanediamine.

[0036] Furthermore, the sodium bicarbonate, calcium oxide and calcium carbonate are nanopowders, and the mass ratio of the sodium bicarbonate, calcium oxide and calcium carbonate is 1:1:1.

[0037] Furthermore, the solvent is ethyl acetate or diisobutyl carbinol.

[0038] Furthermore, a method for preparing a polyurethane resin for synthetic leather comprises the following steps:

[0039] Preparation of component A:

[0040] S1, adding 40% of the total amount of the solvent in component A into a reactor, and then adding 70% of the total amount of the diisocyanate, polyether polyol, polylactic acid polyol, polydimethylsiloxane and catalyst in component A into a reactor, mixing and reacting to obtain a prepolymer;

[0041] S2, after mixing the polyol in component A, 30% of the total amount of the catalyst and 60% of the total amount of the solvent, add them to the prepolymer obtained in S1 to carry out a chain extension reaction, then add a polyamine to carry out a secondary chain extension reaction, and then add an auxiliary agent and stir evenly to obtain component A;

[0042] Preparation of component B:

[0043] S3, adding 40% of the total amount of the solvent in component B into a reactor, and then adding 70% of the total amount of the diisocyanate, polyether polyol, polylactic acid polyol, polydimethylsiloxane and catalyst in component B into a reactor, mixing and reacting to obtain a prepolymer;

[0044] S4, after uniformly mixing the polyol in component B, 30% of the total amount of the catalyst and 60% of the total amount of the solvent, adding the mixture to the prepolymer obtained in S3 to carry out a chain extension reaction, then adding a polyamine to carry out a secondary chain extension reaction, and then adding an auxiliary agent and stirring evenly to obtain component B;

[0045] The reaction temperature in steps S1 and S3 is 75-135°C, and the reaction time is 2-4 hours; the reaction temperature in steps S2 and S4 is 85-155°C, and the reaction time is 1-2 hours;

[0046] Preparation of polyurethane for synthetic leather:

[0047] S5. Apply component A quickly and evenly on the velvet release paper, and then apply component B quickly and evenly on the coating of component A, and then dry it at a temperature between 100 and 160°C for 2 to 3 hours, then laminate it with the non-woven fabric base cloth, continue drying for 1 hour, slowly cool it to room temperature and peel it off to obtain polyurethane for synthetic leather. The cooling rate during the slow cooling process is 0.25 to 0.3°C / min.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] In the present invention, the proportion of polylactic acid polyol in component A is higher than that in component B, so that component A is easier to separate when it is in direct contact with velvet release paper. Hexamethylenetetramine, N-ethylmorpholine and triethanolamine are selected as catalysts, especially hexamethylenetetramine, which can induce crystallization of polyurethane resin due to its structural characteristics, and thus is easier to separate from velvet release paper. In addition, the batch addition method of the catalyst can make the chain extension reaction more gentle and controllable, and improve the uniformity of the product. The auxiliary agent is a mixture of sodium bicarbonate, calcium oxide and calcium carbonate, especially in the form of nano powder, which can form micropores in the polyurethane resin, reduce the adhesion with the release paper, and improve the air permeability and degradation performance of the resin. Ethyl acetate or diisobutyl carbinol is used as a solvent, wherein diisobutyl carbinol can not only shorten the reaction time and save the preparation time, but also improve the smell of the final product due to its characteristics as a fragrance additive.

[0050] The preparation method includes precisely controlled reaction temperature and time, and specific cooling rate control, which are helpful to improve the crystallinity of the polyurethane resin, thereby facilitating its peeling from the velvet release paper;

[0051] The unique formula of the additive and its nano powder form: form micropores, reduce the adhesion to the release paper, and make it easy to peel off. At the same time, it improves the air permeability of the polyurethane resin and improves the degradation performance, making the product more environmentally friendly;

[0052] Precise control of reaction temperature, time and cooling rate: Precise temperature and time control ensures the correct reaction and expected chemical structure of the polyurethane resin, improves the consistency of the product, and the controlled cooling rate increases the crystallinity of the polyurethane resin, facilitates the peeling from the velvet release paper, and reduces the difficulty and cost of post-production processing;

[0053] The rotating motor will drive the inner transmission rod to rotate along the inner side of the reactor, thereby improving the efficiency of mixing the raw materials in the reactor; at the same time, the rotating bottom connecting rod will synchronously drive the cooling fan to rotate and generate wind force, thereby improving the cooling efficiency by placing the reacted liquid into the cooling cylinder, and the surface of the cooling cylinder is provided with a plurality of heat sinks, which increase the heat dissipation area and the heat dissipation effect of the cooling cylinder, and the cooling fan is used to generate wind force to blow to the surface of the heat sink, thereby improving the heat exchange efficiency of the heat sink. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0055] Figure 1 It is a schematic diagram of the overall appearance structure of the present invention;

[0056] Figure 2It is a schematic diagram of the bottom connecting rod structure of the present invention;

[0057] Figure 3 It is a schematic diagram of the cooling fan structure of the present invention.

[0058] In the figure: 1, supporting frame; 2, reactor; 301, side supporting frame; 302, motor body; 303, inner transmission rod; 304, connecting fan; 305, inner connecting rod; 306, large transmission gear disc; 307, side transmission ring; 308, sliding ring rail; 309, top cover; 401, cooling cylinder; 402, liquid inlet; 403, heat sink; 404, small transmission gear disc; 405, bottom fixing rod; 406, No. 1 oblique gear disc; 407, bottom supporting rod; 408, bottom bearing disc; 409, No. 2 oblique gear disc; 4010, side transmission rod; 4011, No. 3 oblique gear disc; 4012, side bearing disc; 4013, No. 4 oblique gear disc; 4014, side L frame; 4015, bottom connecting rod; 4016, cooling fan. DETAILED DESCRIPTION

[0059] The technical scheme in the embodiment of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention. A preparation device for polyurethane resin for synthetic leather includes a supporting chassis 1, a reactor 2 is fixedly connected to the top of the supporting chassis 1, side supporting frames 301 are fixedly connected to both sides of the supporting chassis 1, a motor body 302 is fixedly connected to one side of the side supporting frame 301, an inner transmission rod 303 is fixedly connected to the output shaft of the motor body 302, a connecting fan 304 is fixedly connected to the surface of the inner transmission rod 303, an inner connecting rod 305 is fixedly connected to the other side of the inner transmission rod 303, a large transmission gear disc 306 is fixedly connected to one side of the inner connecting rod 305, and side transmission rings 307 are fixedly connected to the upper and lower sides of the large transmission gear disc 306, a sliding ring rail 308 is opened on the surface of the reactor 2, and a top cover 309 is arranged on the top of the reactor 2.

[0060] It should be noted that the bottom of the top cover 309 and the top of the reactor 2 are both provided with a sliding ring rail 308. The sliding of the side transmission ring 307 and the sliding ring rail 308 improves the rotation stability of the large transmission gear disc 306. The rotating large transmission gear disc 306 will engage with the small transmission gear disc 404. During the rotation of the large transmission gear disc 306, the small transmission gear disc 404 will be synchronously driven to rotate. The rotating small transmission gear disc 404 will drive the bottom fixed rod 405 to rotate. The rotation of the side transmission rod 4010 will drive the third bevel gear disc 4011 to rotate. The cooling efficiency is improved by placing the reacted liquid into the cooling tube 401, and the surface of the cooling tube 401 is provided with a plurality of heat sinks 403. The heat sink 403 is used to increase the heat dissipation area, thereby improving the heat dissipation effect of the cooling tube 401, and the cooling fan 4016 is used to generate wind to blow to the surface of the heat sink 403, thereby improving the heat exchange efficiency of the heat sink 403.

[0061] In an optional embodiment: a cooling cylinder 401 is fixedly connected to one side of the supporting base frame 1, a liquid inlet 402 is fixedly connected to the top of the cooling cylinder 401, a heat sink 403 is fixedly connected to the surface of the cooling cylinder 401, a small transmission gear disc 404 is meshedly connected to one side of the large transmission gear disc 306, a bottom fixing rod 405 is fixedly connected to one side of the small transmission gear disc 404, one end of the bottom fixing rod 405 is fixedly connected to a No. 1 bevel gear disc 406, one side of the No. 1 bevel gear disc 406 is fixedly connected to a bottom support rod 407, one side of the bottom support rod 407 is movably connected to a bottom bearing disc 408, and the No. 1 bevel gear disc 406 is fixedly connected to a bottom support rod 407. One side of the disk 406 is meshedly connected with the second beveled toothed disk 409, one side of the second beveled toothed disk 409 is fixedly connected with the side transmission rod 4010, one side of the side transmission rod 4010 is fixedly connected with the third beveled toothed disk 4011, one side of the third beveled toothed disk 4011 is meshedly connected with the fourth beveled toothed disk 4013, one end of the side transmission rod 4010 is movably connected with the side bearing disk 4012, one side of the side bearing disk 4012 is movably connected with the side L-frame 4014, one side of the fourth beveled toothed disk 4013 is fixedly connected with the bottom connecting rod 4015, and one end of the bottom connecting rod 4015 is fixedly connected with the cooling fan 4016.

[0062] It should be noted that the rotating bottom connecting rod 4015 will synchronously drive the cooling fan 4016 to rotate and generate wind force, and the cooling efficiency is improved by placing the reacted liquid into the cooling tube 401, and a plurality of heat sinks 403 are provided on the surface of the cooling tube 401. The heat sink 403 is utilized to increase the heat dissipation area, thereby improving the heat dissipation effect of the cooling tube 401, and the cooling fan 4016 is utilized to generate wind force to blow toward the surface of the heat sink 403, thereby improving the heat exchange efficiency of the heat sink 403.

[0063] A polyurethane resin for synthetic leather, comprising component A and component B.

[0064] The A component includes the following substances in parts by mass:

[0065] Toluene diisocyanate 50kg

[0066] 30kg polyether polyol, average molecular weight 1000

[0067] Polylactic acid polyol 10kg

[0068] Polydimethylsiloxane 5kg

[0069] Ethylene glycol 3kg

[0070] Ethylenediamine 3kg

[0071] N-Ethylmorpholine 0.6kg

[0072] 2.4kg mixture of sodium bicarbonate, calcium oxide and calcium carbonate, with a mass ratio of 1:1:1

[0073] Ethyl acetate 200 kg;

[0074] The B component includes the following substances in parts by mass:

[0075] Toluene diisocyanate 50kg

[0076] 30kg polyether polyol, average molecular weight 1000

[0077] Polylactic acid polyol 6kg

[0078] Polydimethylsiloxane 5kg

[0079] Ethylene glycol 3kg

[0080] Ethylenediamine 3kg

[0081] N-Ethylmorpholine 0.6kg

[0082] 0.6kg of a mixture of sodium bicarbonate, calcium oxide and calcium carbonate, with a mass ratio of 1:1:1;

[0083] Ethyl acetate 200 kg;

[0084] The method for preparing the polyurethane resin for synthetic leather is characterized by comprising the following steps:

[0085] Preparation of component A:

[0086] S1, adding 40% of the total amount of ethyl acetate in component A into reactor 2, and then adding 70% of the total amount of toluene diisocyanate, polyether polyol, polylactic acid polyol, polydimethylsiloxane and N-ethylmorpholine in component A into reactor 2, mixing and reacting, the reaction temperature is 85-95°C, the reaction time is 4h, to obtain a prepolymer;

[0087] S2, after mixing 30% of the total amount of ethylene glycol, N-ethylmorpholine and 60% of the total amount of ethyl acetate in component A, add them to the prepolymer obtained in S1 to carry out chain extension reaction, and then add ethylenediamine to carry out secondary chain extension reaction, the reaction temperature is 85-95°C, the reaction time is 2h, and then add a mixture of sodium bicarbonate, calcium oxide and calcium carbonate and stir evenly to obtain component A;

[0088] Preparation of component B:

[0089] S3: adding 40% of the total amount of ethyl acetate in component B into reactor 2, and then adding 70% of the total amount of toluene diisocyanate, polyether polyol, polylactic acid polyol, polydimethylsiloxane and N-ethylmorpholine in component B into reactor 2, mixing and reacting, the reaction temperature is 85-95° C., the reaction time is 4 hours, and a prepolymer is obtained;

[0090] S4, after mixing 30% of the total amount of ethylene glycol, N-ethylmorpholine and 60% of the total amount of ethyl acetate in component B, add them to the prepolymer obtained in S3 to carry out chain extension reaction, and then add ethylenediamine to carry out secondary chain extension reaction, the reaction temperature is 85-95°C, the reaction time is 2h, and then add a mixture of sodium bicarbonate, calcium oxide and calcium carbonate and stir evenly to obtain component B;

[0091] Preparation of polyurethane for synthetic leather:

[0092] S5. Apply component A quickly and evenly on the velvet release paper, and then apply component B quickly and evenly on the coating of component A, and then dry it at a temperature between 100 and 105°C for 2 hours, then laminate it with the non-woven fabric base cloth, continue drying for 1 hour, slowly cool it to room temperature and peel it off, with a cooling rate of 0.25°C / min, to obtain polyurethane for synthetic leather.

[0093] The velvet release paper used in the prepared polyurethane for synthetic leather can be used 21 times.

[0094] Example 2

[0095] A polyurethane resin for synthetic leather, comprising component A and component B.

[0096] The A component includes the following substances in parts by mass:

[0097] Dimer acid diisocyanate 60kg

[0098] 40kg polyether polyol, average molecular weight 1200

[0099] Polylactic acid polyol 20kg

[0100] Polydimethylsiloxane 10kg

[0101] 1,4-Butanediol 5kg

[0102] 1,2-cyclohexanediamine 5kg

[0103] Hexamethylenetetramine 0.6kg

[0104] 2.4kg mixture of sodium bicarbonate, calcium oxide and calcium carbonate, with a mass ratio of 1:1:1

[0105] Diisobutyl carbinol 100kg;

[0106] The B component includes the following substances in parts by mass:

[0107] Dimer acid diisocyanate 60kg

[0108] 40kg polyether polyol, average molecular weight 1000

[0109] Polylactic acid polyol 9kg

[0110] Polydimethylsiloxane 10kg

[0111] 1,4-Butanediol 5kg

[0112] 1,2-cyclohexanediamine 5kg

[0113] Hexamethylenetetramine 0.6kg

[0114] 0.6kg of a mixture of sodium bicarbonate, calcium oxide and calcium carbonate, with a mass ratio of 1:1:1

[0115] Diisobutyl carbinol 100kg;

[0116] The method for preparing the polyurethane resin for synthetic leather is characterized by comprising the following steps:

[0117] Preparation of component A:

[0118] S1, adding 40% of the total amount of diisobutyl carbinol in component A into reactor 2, and then adding 70% of the total amount of dimer acid diisocyanate, polyether polyol, polylactic acid polyol, polydimethylsiloxane and urotropine in component A into reactor 2, mixing and reacting, the reaction temperature is 115-120° C., the reaction time is 2 hours, and a prepolymer is obtained;

[0119] S2, after mixing 30% of the total amount of 1,4-butanediol, urotropine and 60% of the total amount of diisobutyl carbinol in component A, add them to the prepolymer obtained in S1 to carry out chain extension reaction, and then add 1,2-cyclohexanediamine to carry out secondary chain extension reaction, the reaction temperature is 115-120°C, the reaction time is 1h, and then add a mixture of sodium bicarbonate, calcium oxide and calcium carbonate and stir evenly to obtain component A;

[0120] Preparation of component B:

[0121] S3, adding 40% of the total amount of diisobutyl carbinol in component B into reactor 2, and then adding 70% of the total amount of dimer acid diisocyanate, polyether polyol, polylactic acid polyol, polydimethylsiloxane and urotropine in component B into reactor 2, mixing and reacting, the reaction temperature is 115-120° C., the reaction time is 2 hours, and a prepolymer is obtained;

[0122] S4, after mixing 30% of the total amount of 1,4-butanediol, urotropine and 60% of the total amount of diisobutyl carbinol in component B, add them to the prepolymer obtained in S3 to carry out chain extension reaction, and then add 1,2-cyclohexanediamine to carry out secondary chain extension reaction, the reaction temperature is 115-120° C., the reaction time is 1h, and then add a mixture of sodium bicarbonate, calcium oxide and calcium carbonate and stir evenly to obtain component B;

[0123] Preparation of polyurethane for synthetic leather:

[0124] S5. Apply component A quickly and evenly on the velvet release paper, and then apply component B quickly and evenly on the coating of component A, and then dry it at a temperature between 140 and 145°C for 1 hour, then laminate it with the non-woven fabric base cloth, continue drying for 1 hour, slowly cool it to room temperature and peel it off, with a cooling rate of 0.25°C / min, to obtain polyurethane for synthetic leather.

[0125] The velvet release paper used in the prepared polyurethane for synthetic leather can be used 26 times.

[0126] Example 3

[0127] A polyurethane resin for synthetic leather, comprising component A and component B.

[0128] The A component includes the following substances in parts by mass:

[0129] Dicyclohexylmethane diisocyanate 60kg

[0130] 40kg polyether polyol, average molecular weight 1200

[0131] Polylactic acid polyol 20kg

[0132] Polydimethylsiloxane 10kg

[0133] 1,4-Butanediol 5kg

[0134] 1,2-cyclohexanediamine 5kg

[0135] Triethanolamine 0.6kg

[0136] 2.4kg mixture of sodium bicarbonate, calcium oxide and calcium carbonate, with a mass ratio of 1:1:1

[0137] Diisobutyl carbinol 100kg;

[0138] The B component includes the following substances in parts by mass:

[0139] Dicyclohexylmethane diisocyanate 60kg

[0140] 40kg polyether polyol, average molecular weight 1000

[0141] Polylactic acid polyol 9kg

[0142] Polydimethylsiloxane 10kg

[0143] 1,4-Butanediol 5kg

[0144] 1,2-cyclohexanediamine 5kg

[0145] Triethanolamine 0.6kg

[0146] 0.6kg of a mixture of sodium bicarbonate, calcium oxide and calcium carbonate, with a mass ratio of 1:1:1

[0147] Diisobutyl carbinol 100kg;

[0148] The method for preparing the polyurethane resin for synthetic leather is characterized by comprising the following steps:

[0149] Preparation of component A:

[0150] S1, adding 40% of the total amount of diisobutyl carbinol in component A into reactor 2, and then adding 70% of the total amount of dicyclohexylmethane diisocyanate, polyether polyol, polylactic acid polyol, polydimethylsiloxane and triethanolamine in component A into reactor 2, mixing and reacting, the reaction temperature is 115-120° C., the reaction time is 2 h, and a prepolymer is obtained;

[0151] S2, after mixing 30% of the total amount of 1,4-butanediol, triethanolamine and 60% of the total amount of diisobutylcarbinol in component A, add them to the prepolymer obtained in S1 to carry out chain extension reaction, and then add 1,2-cyclohexanediamine to carry out secondary chain extension reaction, the reaction temperature is 115-120°C, the reaction time is 1h, and then add a mixture of sodium bicarbonate, calcium oxide and calcium carbonate and stir evenly to obtain component A;

[0152] Preparation of component B:

[0153] S3, adding 40% of the total amount of diisobutyl carbinol in component B into reactor 2, and then adding 70% of the total amount of dicyclohexylmethane diisocyanate, polyether polyol, polylactic acid polyol, polydimethylsiloxane and triethanolamine in component B into reactor 2, mixing and reacting, the reaction temperature is 115-120° C., the reaction time is 2 hours, and a prepolymer is obtained;

[0154] S4, after mixing 30% of the total amount of 1,4-butanediol, triethanolamine and 60% of the total amount of diisobutyl carbinol in component B, add them to the prepolymer obtained in S3 to carry out chain extension reaction, and then add 1,2-cyclohexanediamine to carry out secondary chain extension reaction, the reaction temperature is 115-120° C., the reaction time is 1h, and then add a mixture of sodium bicarbonate, calcium oxide and calcium carbonate and stir evenly to obtain component B;

[0155] Preparation of polyurethane for synthetic leather:

[0156] S5. Apply component A quickly and evenly on the velvet release paper, and then apply component B quickly and evenly on the coating of component A, and then dry it at a temperature between 140 and 145°C for 1 hour, then laminate it with the non-woven fabric base cloth, continue drying for 1 hour, slowly cool it to room temperature and peel it off, with a cooling rate of 0.25°C / min, to obtain polyurethane for synthetic leather.

[0157] The velvet release paper used in the prepared polyurethane for synthetic leather can be used 23 times.

[0158] Example 4

[0159] The mixture of sodium bicarbonate, calcium oxide and calcium carbonate in Example 2 was replaced with a mixture of nanoparticles of sodium bicarbonate, calcium oxide and calcium carbonate. The rest was the same as Example 2 and no further description was given. The velvet release paper used in the prepared polyurethane for synthetic leather could be used 28 times, indicating that the product prepared with nanoparticles has better performance.

[0160] Example 5

[0161] The dimer acid diisocyanate in Example 2 was replaced with toluene diisocyanate. The other aspects were the same as in Example 2 and no further description was given. The velvet release paper used in the prepared polyurethane for synthetic leather could be used 23 times, indicating that the product prepared with dimer acid diisocyanate had better performance.

[0162] Example 6

[0163] The urotropine in Example 2 was replaced with N-ethylmorpholine, and the rest was the same as Example 2, which will not be described again. The velvety release paper used in the prepared polyurethane for synthetic leather can be used 24 times, indicating that the product prepared with urotropine has better performance.

[0164] Example 7

[0165] The amounts of polylactic acid polyol and auxiliary agent in component A in Example 3 are changed to be the same as those in component B, and the rest are the same as in Example 3 and will not be described in detail. The velvet release paper used for the prepared polyurethane for synthetic leather can be used 21 times.

[0166] Example 8

[0167] The cooling rate in step S5 of Example 3 is changed to 3°C / min, and the rest is the same as Example 3 and will not be described again. The velvet release paper used for the prepared polyurethane for synthetic leather can be used 21 times.

[0168] A polyurethane resin for synthetic leather and a preparation device and method thereof, comprising the following steps:

[0169] S1. After 40% of the total amount of ethyl acetate in component A is added to the reactor, the motor body 302 is started, and the motor body 302 is used to drive the inner transmission rod 303 to rotate. The motor body 302 is fixed to the two sides of the support base 1 through two side support frames 301 to maintain the stability of the motor body 302 during operation. The rotating motor body 302 will drive the inner transmission rod 303 to rotate along the inner side of the reactor 2, thereby improving the efficiency of mixing the raw materials in the reactor; at the same time, through the connection of the inner connecting rod 305, the large transmission gear disc 306 will be synchronously driven during the rotation of the inner transmission rod 303 The large transmission gear disc 306 rotates, and the side transmission ring 307 is driven to rotate during the rotation of the large transmission gear disc 306. The bottom of the top cover 309 and the top of the reactor 2 are both provided with a sliding ring rail 308. The sliding of the side transmission ring 307 and the sliding ring rail 308 improves the rotation stability of the large transmission gear disc 306. The rotating large transmission gear disc 306 meshes with the small transmission gear disc 404. During the rotation of the large transmission gear disc 306, the small transmission gear disc 404 is synchronously driven to rotate. The rotating small transmission gear disc 404 drives the bottom fixed rod 405 to rotate. 05 will drive the No. 1 bevel gear plate 406 to rotate, and after the No. 1 bevel gear plate 406 rotates, it will be movably supported on the surface of the bottom bearing plate 408 through the bottom support rod 407. Through the meshing of the No. 1 bevel gear plate 406 and the No. 2 bevel gear plate 409, when the No. 2 bevel gear plate 409 rotates, it will synchronously drive the side transmission rod 4010 to rotate, and the side transmission rod 4010 will be movably supported on one side of the side L frame 4014 through the side bearing plate 4012. The rotation of the side transmission rod 4010 will drive the No. 3 bevel gear plate 4011 to rotate, and the rotating No. 3 bevel gear plate 4011 will synchronously drive the No. 4 bevel gear plate The bevel gear plate 4013 rotates, and the rotating No. 4 bevel gear plate 4013 will synchronously drive the bottom connecting rod 4015 to rotate. The rotating bottom connecting rod 4015 will synchronously drive the cooling fan 4016 to rotate and generate wind force. The cooling efficiency is improved by placing the reacted liquid into the cooling tube 401, and a plurality of heat sinks 403 are provided on the surface of the cooling tube 401. The heat sink 403 is used to increase the heat dissipation area, and the heat dissipation effect of the cooling tube 401 is improved. The cooling fan 4016 is used to generate wind force to blow to the surface of the heat sink 403, thereby improving the heat exchange efficiency of the heat sink 403.

[0170] It should be noted that the parts not described in detail in the present invention are all prior art, and the corresponding models can be selected according to actual needs. The internal structure and operating principle of the above parts are also common knowledge of those skilled in the art, and no further elaboration will be given on this.

[0171] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for preparing polyurethane resin for synthetic leather, comprising a supporting frame (1), characterized in that: The top of the support base (1) is fixedly connected to a reaction kettle (2); the two sides of the support base (1) are fixedly connected to side support frames (301); one side of the side support frame (301) is fixedly connected to a motor body (302); the output shaft of the motor body (302) is fixedly connected to an inner transmission rod (303); the surface of the inner transmission rod (303) is fixedly connected to a connecting fan (304); the other side of the inner transmission rod (303) is fixedly connected to an inner connecting rod (305); one side of the inner connecting rod (305) is fixedly connected to a large transmission gear disc (306); the upper and lower sides of the large transmission gear disc (306) are fixedly connected to side transmission rings (307); a sliding ring rail (308) is provided on the surface of the reaction kettle (2); and a top cover (309) is provided on the top of the reaction kettle (2).

2. The device for preparing polyurethane resin for synthetic leather according to claim 1, characterized in that: A cooling cylinder (401) is fixedly connected to one side of the support base frame (1), a liquid inlet (402) is fixedly connected to the top of the cooling cylinder (401), a heat sink (403) is fixedly connected to the surface of the cooling cylinder (401), a small transmission gear disc (404) is meshedly connected to one side of the large transmission gear disc (306), a bottom fixing rod (405) is fixedly connected to one side of the small transmission gear disc (404), a first helical gear disc (406) is fixedly connected to one end of the bottom fixing rod (405), a bottom support rod (407) is fixedly connected to one side of the first helical gear disc (406), a bottom bearing disc (408) is movably connected to one side of the bottom support rod (407), and the first helical gear disc (40 6), one side of the second bevel gear plate (409) is meshedly connected, one side of the second bevel gear plate (409) is fixedly connected to a side transmission rod (4010), one side of the side transmission rod (4010) is fixedly connected to a third bevel gear plate (4011), one side of the third bevel gear plate (4011) is meshedly connected to a fourth bevel gear plate (4013), one end of the side transmission rod (4010) is movably connected to a side bearing plate (4012), one side of the side bearing plate (4012) is movably connected to a side L-frame (4014), one side of the fourth bevel gear plate (4013) is fixedly connected to a bottom connecting rod (4015), one end of the bottom connecting rod (4015) is fixedly connected to a cooling fan (4016).

3. A polyurethane resin for synthetic leather, characterized in that: Also includes component A and component B; The A component includes the following substances in parts by mass: 50-60 parts of diisocyanate; 30-40 parts of polyether polyol; 10-20 parts of polylactic acid polyol; 5-10 parts of polydimethylsiloxane; 3-5 parts of polyol; 3-5 parts of polyamine; Catalyst 0.6~0.7 parts; 2~3 parts of additives; 80-300 parts of solvent; The B component includes the following substances in parts by mass: 50-60 parts of diisocyanate; 30-40 parts of polyether polyol; 6-9 parts of polylactic acid polyol; 5-10 parts of polydimethylsiloxane; 3-5 parts of polyol; 3-5 parts of polyamine; Catalyst 0.6-0.7 parts; 0.5-1 part of additive; 80-300 parts of solvent; The catalyst is at least one of urotropine, N-ethylmorpholine and triethanolamine; The auxiliary agent is a mixture of sodium bicarbonate, calcium oxide and calcium carbonate.

4. The polyurethane resin for synthetic leather according to claim 3, characterized in that: The diisocyanate is at least one of dimer diisocyanate (DDI), dicyclohexylmethane diisocyanate (HMDI) and toluene diisocyanate (TDI).

5. The polyurethane resin for synthetic leather according to claim 4, characterized in that: The relative molecular mass of the polyether polyol is between 1000 and 2000.

6. The polyurethane resin for synthetic leather according to claim 5, characterized in that: The polyol is ethylene glycol or 1,4-butanediol.

7. The polyurethane resin for synthetic leather according to claim 6, characterized in that: The polyamine is ethylenediamine or 1,2-cyclohexanediamine.

8. The polyurethane resin for synthetic leather according to claim 7, characterized in that: The sodium bicarbonate, calcium oxide and calcium carbonate are nano powders, and the mass ratio of the sodium bicarbonate, calcium oxide and calcium carbonate is 1:1:

1.

9. The polyurethane resin for synthetic leather according to claim 8, characterized in that: The solvent is ethyl acetate or diisobutyl carbinol.

10. A method for preparing polyurethane resin for synthetic leather, based on the preparation device for polyurethane resin for synthetic leather and the polyurethane resin for synthetic leather according to claims 2 and 9, characterized in that: The following steps are involved: Preparation of component A: S1, adding 40% of the total amount of the solvent in component A to a reaction kettle (2), and then adding 70% of the total amount of the diisocyanate, polyether polyol, polylactic acid polyol, polydimethylsiloxane and catalyst in component A to the reaction kettle (2), mixing and reacting to obtain a prepolymer; S2, after mixing the polyol in component A, 30% of the total amount of the catalyst and 60% of the total amount of the solvent, add them to the prepolymer obtained in S1 to carry out a chain extension reaction, then add a polyamine to carry out a secondary chain extension reaction, and then add an auxiliary agent and stir evenly to obtain component A; Preparation of component B: S3, adding 40% of the total amount of the solvent in component B into the reaction kettle (2), and then adding 70% of the total amount of the diisocyanate, polyether polyol, polylactic acid polyol, polydimethylsiloxane and catalyst in component B into the reaction kettle (2), mixing and reacting to obtain a prepolymer; S4, after uniformly mixing the polyol in component B, 30% of the total amount of the catalyst and 60% of the total amount of the solvent, adding the mixture to the prepolymer obtained in S3 to carry out a chain extension reaction, then adding a polyamine to carry out a secondary chain extension reaction, and then adding an auxiliary agent and stirring evenly to obtain component B; The reaction temperature in steps S1 and S3 is 75-135°C, and the reaction time is 2-4 hours; the reaction temperature in steps S2 and S4 is 85-155°C, and the reaction time is 1-2 hours; Preparation of polyurethane for synthetic leather: S5. Apply component A quickly and evenly on the velvet release paper, and then apply component B quickly and evenly on the coating of component A. Then, dry it at a temperature between 100 and 160°C for 2 to 3 hours, then laminate it with the non-woven fabric base cloth, continue drying for 1 hour, slowly cool it to room temperature and peel it off to obtain polyurethane for synthetic leather. The cooling rate during the slow cooling process is 0.25 to 0.3°C / min.

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