Strong-hygroscopicity slow-release fertilizer based on resin gel and preparation process

Abstract

The invention discloses a preparation process of a strong hygroscopic slow-release fertilizer based on resin gel, which comprises the following steps: uniformly and fully mixing modified plant fiber and a fertilizer body according to a weight ratio of 3: 5, then adding a diatomite agent accounting for 10-15% of the total amount of the modified plant fiber, and fully stirring to obtain the strong hygroscopic slow-release fertilizer based on the resin gel. According to the strong-hygroscopicity slow-release fertilizer based on the resin gel, modified plant fibers and a fertilizer body are matched, then a diatomite agent is used for blending and improving, the modified plant fibers are prepared into an additive by performing thermal improvement on nano attapulgite, blending biomass carbon and a sodium citrate solution, and the additive is matched with raw materials such as titanium oxide to prepare a modified liquid.

Description

Technical Field

[0001] The present invention relates to the technical field of slow-release fertilizers, and particularly relates to a strong hygroscopic slow-release fertilizer based on resin gel and a production process thereof. Background Art

[0002] Superabsorbent resin is a polymer with a certain degree of crosslinking. It can quickly absorb hundreds of times its own weight of water to form a gel, and this gel can still retain water under a certain pressure without separating out. Polyacrylate, starch acrylate polymer, starch-acrylonitrile graft copolymer, acrylamide-acrylonitrile-acrylic acid terpolymer, etc. can all be used as superabsorbent resins. Generally made into powder or fine granular form, it has the characteristics of fast water absorption speed and high water absorption capacity. It is used in the paper industry for diapers, sanitary napkins, napkins, etc. It can also be used as a thickener for cosmetics, ointments, drugs, detergents, a soil improver, a drug sustained-release base material, a modifier for cement, mortar, and concrete, a dehydrating agent for industrial oils and gases, a water retention agent for forestation and seedling raising, etc.

[0003] The existing slow-release fertilizers are prepared using resin gel, and the obtained fertilizer products have poor long-term water retention performance in soil and low hygroscopic performance, which limits the use efficiency of the products. Based on this, the present invention further improves them. Summary of the Invention

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide a strong hygroscopic slow-release fertilizer based on resin gel and a production process thereof to solve the problems raised in the above background art.

[0005] The present invention adopts the following technical solutions to solve the technical problems: The present invention provides a production process of a strong hygroscopic slow-release fertilizer based on resin gel, including the following steps: The modified plant fiber and the fertilizer body are evenly mixed in a weight ratio of 3:5, and then 10-15% of the total amount of the modified plant fiber of diatomaceous earth agent is added and stirred evenly to obtain a strong hygroscopic slow-release fertilizer based on resin gel.

[0006] Preferably, the fertilizer body is prepared from resin gel and fertilizer matrix in a weight ratio of 4:7; The resin gel is made by referring to the method of Example 1 in CN103804697B; The fertilizer matrix is 5-8 parts of trace elements, 3-5 parts of water retention agent, and 10-14 parts of nitrogen, phosphorus, and potassium fertilizers; The trace element is one of copper and zinc; the water retention agent is potassium polyacrylate; the nitrogen, phosphorus, and potassium fertilizers are prepared from nitrogen, phosphorus, and potassium in a weight ratio of 2:2:2.

[0007] Preferably, the modification method of the modified plant fiber is: S01: Heat-treat nano-attapulgite clay at 110 - 120 °C for 20 min, then increase the temperature to 300 °C at a rate of 1 - 3 °C / min, hold for 5 min, and finally cool to 50 °C at a rate of 2 - 4 °C / min and hold; Mix the held nano-attapulgite, biomass carbon, and sodium citrate solution thoroughly to obtain an additive; S02: Blend 1 - 2 parts of silane coupling agent KH550, 2 - 3 parts of sodium carboxymethylcellulose, and 4 - 7 parts of titanium oxide into 5 - 8 parts of the additive and stir thoroughly to obtain a modified liquid; S03: Add coconut shell fibers to 3 - 5 times the total amount of coconut shell fibers of the modified liquid and stir for modification. After stirring, filter and dry to obtain modified plant fibers.

[0008] Preferably, the mass fraction of the sodium citrate solution is 5 - 8%; the stirring speed for the stirring modification treatment is 450 - 500 r / min, and stir for 1 h.

[0009] Preferably, the mass ratio of the held nano-attapulgite, biomass carbon, and sodium citrate solution is (5 - 8):(3 - 5):7.

[0010] Preferably, the preparation method of the diatomite agent is: S11: Blend diatomite, a 5% urea solution by mass fraction, and sodium silicate solution evenly according to the weight ratio (5 - 8):3:(2 - 4) to obtain a diatomite liquid; S12: Add 2 - 3 parts of sodium humate and 1 - 2 parts of silane coupling agent KH550 to 5 - 8 parts of chitosan solution, and then add 2 - 4 parts of volcanic rock and stir thoroughly to obtain a modifier; Mix the modifier and the diatomite liquid in a weight ratio of 3:5, perform ball milling treatment. After ball milling, filter and dry to obtain the diatomite agent.

[0011] Preferably, the mass fraction of the sodium silicate solution is 5 - 8%; the mass fraction of the chitosan solution is 2 - 5%.

[0012] Preferably, the ball milling speed for the mixing and ball milling treatment is 1000 r / min, and ball mill for 2 h.

[0013] The present invention also provides a highly hygroscopic slow-release fertilizer prepared by the manufacturing process of a highly hygroscopic slow-release fertilizer based on resin gel.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The highly hygroscopic slow-release fertilizer based on resin gel of the present invention adopts modified plant fiber and fertilizer body, and then is improved by diatomaceous earth agent. The modified plant fiber adopts nano-attapulgite and is thermally improved, and then biomass carbon and sodium citrate solution are blended to prepare additives, and modified liquid is prepared by blending with raw materials such as titanium oxide. At the same time, coconut shell fiber is improved by the modified liquid, and the obtained modified plant fiber enhances the product performance effect in the system, improves the long-term water retention performance of the soil of the fertilizer product, and the moisture absorption performance. The diatomaceous earth in the diatomaceous earth agent, urea solution with a mass fraction of 5% and sodium silicate solution are blended to prepare diatomaceous earth liquid, and the modified agent is improved. The raw materials such as sodium humate and volcanic rock in the modifier are blended, improved and optimized, and the obtained diatomaceous earth agent is better blended with the modified plant fiber, so that the performance of the product is further improved. DETAILED DESCRIPTION

[0015] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with specific embodiments. 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.

[0016] The manufacturing process of a highly hygroscopic slow-release fertilizer based on resin gel in this embodiment comprises the following steps: The modified plant fiber and the fertilizer body are mixed thoroughly in a weight ratio of 3:5, and then 10-15% of the total amount of the modified plant fiber is added with diatomaceous earth, and stirred thoroughly to obtain a highly hygroscopic slow-release fertilizer based on resin gel.

[0017] The fertilizer body of this embodiment is prepared by resin gel and fertilizer matrix in a weight ratio of 4:7; The resin gel was prepared by referring to the method of Example 1 in CN103804697B; The fertilizer matrix is ​​5-8 parts of trace elements, 3-5 parts of water retaining agent and 10-14 parts of nitrogen, phosphorus and potassium fertilizers; The trace element is one of copper and zinc; the water retaining agent is potassium polyacrylate; and the nitrogen-phosphorus-potassium fertilizer is a mixture of nitrogen, phosphorus and potassium in a weight ratio of 2:2:2.

[0018] The modification method of the modified plant fiber of this embodiment is: S01: heat-treating the nano-attapulgite at 110-120°C for 20 min, then heating to 300°C at a rate of 1-3°C / min, keeping the temperature for 5 min, and finally cooling to 50°C at a rate of 2-4°C / min, keeping the temperature; The heat-insulated nano-attapulgite, biomass carbon and sodium citrate solution are fully mixed to obtain an additive; S02: Blend 1 - 2 parts of silane coupling agent KH550, 2 - 3 parts of sodium carboxymethyl cellulose, and 4 - 7 parts of titanium oxide into 5 - 8 parts of additive and stir well to obtain a modified liquid; S03: Add coconut shell fiber to the modified liquid which is 3 - 5 times the total amount of coconut shell fiber, stir for modification treatment, after stirring ends, filter by suction and dry to obtain modified plant fiber.

[0019] In this embodiment, the mass fraction of the sodium citrate solution is 5 - 8%; the stirring speed for the stirring modification treatment is 450 - 500 r / min, and stir for 1 h.

[0020] In this embodiment, the mass ratio of the heat - insulating nano - attapulgite, biomass carbon, and sodium citrate solution is (5 - 8):(3 - 5):7.

[0021] The preparation method of the diatomite agent in this embodiment is as follows: S11: Blend diatomite, a urea solution with a mass fraction of 5%, and sodium silicate solution evenly according to the weight ratio (5 - 8):3:(2 - 4) to obtain a diatomite liquid; S12: Add 2 - 3 parts of sodium humate and 1 - 2 parts of silane coupling agent KH550 to 5 - 8 parts of chitosan solution, then add 2 - 4 parts of volcanic rock and stir well to obtain a modifier; Mix the modifier and the diatomite liquid evenly according to the weight ratio of 3:5 and perform ball - milling treatment. After ball - milling ends, filter by suction and dry to obtain the diatomite agent.

[0022] In this embodiment, the mass fraction of the sodium silicate solution is 5 - 8%; the mass fraction of the chitosan solution is 2 - 5%.

[0023] In this embodiment, the ball - milling speed for the mixing and ball - milling treatment is 1000 r / min, and ball - mill for 2 h.

[0024] A strongly hygroscopic slow - release fertilizer produced by the manufacturing process of a strongly hygroscopic slow - release fertilizer based on resin gel in this embodiment.

[0025] Example 1: The manufacturing process of a strongly hygroscopic slow - release fertilizer based on resin gel in this embodiment includes the following steps: Mix the modified plant fiber and the fertilizer body evenly according to the weight ratio of 3:5, then add the diatomite agent which is 10% of the total amount of the modified plant fiber, and stir well to obtain a strongly hygroscopic slow - release fertilizer based on resin gel.

[0026] In this embodiment, the fertilizer body is prepared by mixing resin gel and fertilizer matrix according to the weight ratio of 4:7; The resin gel is prepared by referring to the method in Example 1 of CN103804697B; The fertilizer matrix is 5 parts of trace elements, 3 parts of water - retaining agent, and 10 parts of nitrogen, phosphorus, and potassium fertilizers. The trace element is copper; the water retaining agent is potassium polyacrylate; the nitrogen, phosphorus and potassium fertilizer is prepared from nitrogen, phosphorus and potassium in a weight ratio of 2:2:2.

[0027] The modification method of the modified plant fiber in this example is as follows: S01: Heat-treat the nano-attapulgite clay at 110 °C for 20 min, then heat it to 300 °C at a rate of 1 °C / min, hold for 5 min, and finally cool it to 50 °C at a rate of 2 °C / min and hold; Mix the heat-retained nano-attapulgite, biomass carbon and sodium citrate solution thoroughly to obtain an additive; S02: Mix 1 part of silane coupling agent KH550, 2 parts of sodium carboxymethyl cellulose and 4 parts of titanium oxide and add them to 5 parts of the additive and stir thoroughly to obtain a modified liquid; S03: Add the coconut shell fiber to 3 times the total amount of the coconut shell fiber of the modified liquid and stir for modification treatment. After stirring, filter and dry to obtain the modified plant fiber.

[0028] The mass fraction of the sodium citrate solution in this example is 5%; the stirring speed for the stirring modification treatment is 450 r / min and stir for 1 h.

[0029] The mass ratio of the heat-retained nano-attapulgite, biomass carbon and sodium citrate solution in this example is 5:3:7.

[0030] The preparation method of the diatomite agent in this example is as follows: S11: Mix diatomite, a 5% urea solution and a sodium silicate solution evenly according to a weight ratio of 5:3:2 to obtain a diatomite liquid; S12: Add 2 parts of sodium humate and 1 part of silane coupling agent KH550 to 5 parts of the chitosan solution, and then add 2 parts of volcanic rock and stir thoroughly to obtain a modifier; Mix the modifier and the diatomite liquid according to a weight ratio of 3:5, perform ball milling treatment. After ball milling, filter and dry to obtain the diatomite agent.

[0031] The mass fraction of the sodium silicate solution in this example is 5%; the mass fraction of the chitosan solution is 2%.

[0032] The ball milling speed for the mixing and ball milling treatment in this example is 1000 r / min and ball mill for 2 h.

[0033] A strongly hygroscopic slow-release fertilizer produced by the production process of a strongly hygroscopic slow-release fertilizer based on resin gel in this example.

[0034] Example 2: The production process of a strongly hygroscopic slow-release fertilizer based on resin gel in this example includes the following steps: The modified plant fiber and the fertilizer body are thoroughly mixed in a weight ratio of 3:5, and then 15% of the total amount of the modified plant fiber of diatomaceous earth agent is added and stirred thoroughly to obtain a strongly hygroscopic slow-release fertilizer based on resin gel.

[0035] The fertilizer body in this embodiment is prepared by mixing resin gel and fertilizer matrix in a weight ratio of 4:7; The resin gel is prepared by referring to the method of Example 1 in CN103804697B; The fertilizer matrix is 8 parts of trace elements, 5 parts of water-retaining agent and 4 parts of nitrogen, phosphorus and potassium fertilizers; The trace element is zinc; the water-retaining agent is potassium polyacrylate; the nitrogen, phosphorus and potassium fertilizers are prepared by mixing nitrogen, phosphorus and potassium in a weight ratio of 2:2:2.

[0036] The modification method of the modified plant fiber in this embodiment is as follows: S01: Heat-treat the nano-attapulgite clay at 120 °C for 20 min, then heat it to 300 °C at a rate of 3 °C / min, keep it warm for 5 min, and finally cool it to 50 °C at a rate of 4 °C / min and keep it warm; Mix the heat-preserved nano-attapulgite, biomass carbon and sodium citrate solution thoroughly to obtain an additive; S02: Add 2 parts of silane coupling agent KH550, 3 parts of sodium carboxymethylcellulose and 7 parts of titanium oxide into 8 parts of the additive and stir thoroughly to obtain a modified liquid; S03: Add the coconut shell fiber into 5 times the total amount of the coconut shell fiber of the modified liquid and stir for modification treatment. After the stirring ends, filter and dry to obtain the modified plant fiber.

[0037] The mass fraction of the sodium citrate solution in this embodiment is 8%; the stirring speed of the stirring modification treatment is 500 r / min and stir for 1 h.

[0038] The mass ratio of the heat-preserved nano-attapulgite, biomass carbon and sodium citrate solution in this embodiment is 8:5:7.

[0039] The preparation method of the diatomaceous earth agent in this embodiment is as follows: S11: Mix diatomaceous earth, 5% urea solution by mass fraction and sodium silicate solution evenly in a weight ratio of 8:3:4 to obtain a diatomaceous earth liquid; S12: Add 3 parts of sodium humate and 2 parts of silane coupling agent KH550 into 8 parts of chitosan solution, and then add 4 parts of volcanic rock and stir thoroughly to obtain a modifier; Mix the modifier and the diatomaceous earth liquid evenly in a weight ratio of 3:5 and perform ball milling treatment. After the ball milling ends, filter and dry to obtain the diatomaceous earth agent.

[0040] The mass fraction of the sodium silicate solution in this embodiment is 8%; the mass fraction of the chitosan solution is 5%.

[0041] The mixing ball milling process in this embodiment has a ball milling speed of 1000 r / min and a ball milling time of 2 h.

[0042] The highly hygroscopic slow-release fertilizer of this embodiment is manufactured by a manufacturing process of a highly hygroscopic slow-release fertilizer based on resin gel.

[0043] Embodiment 3: A process for preparing a highly hygroscopic slow-release fertilizer based on resin gel in this embodiment comprises the following steps: The modified plant fiber and the fertilizer body are mixed thoroughly in a weight ratio of 3:5, and then 12.5% ​​of the total amount of the modified plant fiber is added with diatomaceous earth, and stirred thoroughly to obtain a highly hygroscopic slow-release fertilizer based on resin gel.

[0044] The fertilizer body of this embodiment is prepared by resin gel and fertilizer matrix in a weight ratio of 4:7; The resin gel was prepared by referring to the method of Example 1 in CN103804697B; The fertilizer matrix is ​​6.5 parts of trace elements, 4 parts of water retaining agent and 12 parts of nitrogen, phosphorus and potassium fertilizers; The trace element is copper; the water-retaining agent is potassium polyacrylate; and the nitrogen-phosphorus-potassium fertilizer is a mixture of nitrogen, phosphorus and potassium in a weight ratio of 2:2:2.

[0045] The modification method of the modified plant fiber of this embodiment is: S01: The nano-attapulgite was heat treated at 115°C for 20 min, then heated to 300°C at a rate of 2°C / min, kept at that temperature for 5 min, and finally cooled to 50°C at a rate of 3°C / min, and kept at that temperature; The heat-insulated nano-attapulgite, biomass carbon and sodium citrate solution are fully mixed to obtain an additive; S02: 1.5 parts of silane coupling agent KH550, 2.5 parts of sodium carboxymethyl cellulose and 5.5 parts of titanium oxide are mixed and added into 6.5 parts of additives and stirred thoroughly to obtain a modified solution; S03: adding the coconut shell fiber into a modification liquid of 4 times the total amount of the coconut shell fiber, stirring and modifying the solution, and after the stirring is completed, filtering and drying are performed to obtain modified plant fiber.

[0046] The mass fraction of the sodium citrate solution in this example is 6.5%; the stirring speed of the stirring modification treatment is 460 r / min, and the stirring is for 1 hour.

[0047] The mass ratio of the heat-insulating nano-attapulgite, biomass carbon and sodium citrate solution in this embodiment is 6.5:4:7.

[0048] The preparation method of the diatomaceous earth agent of this embodiment is: S11: Blend diatomaceous earth, a 5% urea solution by mass fraction, and sodium silicate solution evenly at a weight ratio of 6.5:3:3 to obtain a diatomaceous earth solution; S12: Add 2.5 parts of sodium humate and 1.5 parts of silane coupling agent KH550 to 6.5 parts of chitosan solution, then add 3 parts of volcanic rock, and stir thoroughly to obtain a modifier; Mix the modifier and the diatomaceous earth solution evenly at a weight ratio of 3:5, conduct ball milling treatment. After the ball milling ends, perform suction filtration and drying to obtain a diatomaceous earth agent.

[0049] In this embodiment, the mass fraction of the sodium silicate solution is 6.5%; the mass fraction of the chitosan solution is 3.5%.

[0050] In this embodiment, the ball milling speed for the uniform ball milling treatment is 1000 r / min, and the ball milling time is 2 h.

[0051] A highly hygroscopic slow-release fertilizer produced by the production process of a highly hygroscopic slow-release fertilizer based on resin gel in this embodiment.

[0052] Example 4: The production process of a highly hygroscopic slow-release fertilizer based on resin gel in this embodiment includes the following steps: Mix the modified plant fiber and the fertilizer body evenly at a weight ratio of 3:5, then add 12% of the diatomaceous earth agent based on the total amount of the modified plant fiber, and stir thoroughly to obtain a highly hygroscopic slow-release fertilizer based on resin gel.

[0053] In this embodiment, the fertilizer body is prepared by mixing resin gel and fertilizer matrix at a weight ratio of 4:7; The resin gel is prepared by referring to the method in Example 1 of CN103804697B; The fertilizer matrix is 6 parts of trace elements, 4 parts of water-retaining agent, and 12 parts of nitrogen, phosphorus, and potassium fertilizer; The trace element is one of copper and zinc; the water-retaining agent is potassium polyacrylate; the nitrogen, phosphorus, and potassium fertilizer is prepared by mixing nitrogen, phosphorus, and potassium at a weight ratio of 2:2:2.

[0054] The modification method of the modified plant fiber in this embodiment is as follows: S01: Heat-treat nano-attapulgite at 115 °C for 20 min, then heat it to 300 °C at a rate of 2 °C / min, hold for 5 min, and finally cool it to 50 °C at a rate of 3 °C / min and hold; Mix the held nano-attapulgite, biomass carbon, and sodium citrate solution thoroughly to obtain an additive; S02: Add 1.5 parts of silane coupling agent KH550, 2.2 parts of sodium carboxymethyl cellulose, and 5.5 parts of titanium oxide to 6 parts of the additive and stir thoroughly to obtain a modified liquid; S03: adding the coconut shell fiber into a modification liquid of 4 times the total amount of the coconut shell fiber, stirring and modifying the solution, and after the stirring is completed, filtering and drying are performed to obtain modified plant fiber.

[0055] The mass fraction of the sodium citrate solution in this embodiment is 6%; the stirring speed of the stirring modification treatment is 460 r / min, and the stirring is for 1 hour.

[0056] The mass ratio of the heat-insulating nano-attapulgite, biomass carbon and sodium citrate solution in this embodiment is 6:4:7.

[0057] The preparation method of the diatomaceous earth agent of this embodiment is: S11: diatomaceous earth, 5% by mass urea solution and sodium silicate solution are uniformly mixed in a weight ratio of 6:3:3 to obtain diatomaceous earth liquid; S12: adding 3 parts of sodium humate and 2 parts of silane coupling agent KH550 to 6 parts of chitosan solution, and then adding 3 parts of volcanic rock, stirring well, to obtain a modifier; The modifier and diatomaceous earth liquid were mixed in a weight ratio of 3:5 and subjected to ball milling. After the ball milling was completed, the mixture was filtered and dried to obtain a diatomaceous earth agent.

[0058] The mass fraction of the sodium silicate solution in this embodiment is 6%; the mass fraction of the chitosan solution is 3%.

[0059] The mixing ball milling process in this embodiment has a ball milling speed of 1000 r / min and a ball milling time of 2 h.

[0060] The highly hygroscopic slow-release fertilizer of this embodiment is manufactured by a manufacturing process of a highly hygroscopic slow-release fertilizer based on resin gel.

[0061] Embodiment 5: A process for preparing a highly hygroscopic slow-release fertilizer based on resin gel in this embodiment comprises the following steps: The modified plant fiber and the fertilizer body are mixed thoroughly in a weight ratio of 3:5, and then 14% of the total amount of the modified plant fiber is added with diatomaceous earth, and stirred thoroughly to obtain a highly hygroscopic slow-release fertilizer based on resin gel.

[0062] The fertilizer body of this embodiment is prepared by resin gel and fertilizer matrix in a weight ratio of 4:7; The resin gel was prepared by referring to the method of Example 1 in CN103804697B; The fertilizer matrix is ​​7 parts of trace elements, 4 parts of water retaining agent and 13 parts of nitrogen, phosphorus and potassium fertilizers; The trace element is one of copper and zinc; the water retaining agent is potassium polyacrylate; and the nitrogen-phosphorus-potassium fertilizer is a mixture of nitrogen, phosphorus and potassium in a weight ratio of 2:2:2.

[0063] The modification method of the modified plant fiber of this embodiment is: S01: Heat-treat nano-attapulgite clay at 118 °C for 20 min, then increase the temperature to 300 °C at a rate of 3 °C / min, hold for 5 min, and finally cool to 50 °C at a rate of 3 °C / min and hold; Mix the heat-treated nano-attapulgite, biomass carbon, and sodium citrate solution thoroughly to obtain an additive; S02: Add 2 parts of silane coupling agent KH550, 3 parts of sodium carboxymethyl cellulose, and 6 parts of titanium oxide to 7 parts of the additive and stir thoroughly to obtain a modified liquid; S03: Add coconut shell fibers to 4 times the total amount of coconut shell fibers of the modified liquid and stir for modification. After stirring, filter and dry to obtain modified plant fibers.

[0064] In this example, the mass fraction of the sodium citrate solution is 7%; the stirring speed for the stirring modification treatment is 490 r / min, and stir for 1 h.

[0065] In this example, the mass ratio of the heat-treated nano-attapulgite, biomass carbon, and sodium citrate solution is 7:4:7.

[0066] The preparation method of the diatomite agent in this example is as follows: S11: Mix diatomite, a urea solution with a mass fraction of 5%, and sodium silicate solution evenly according to a weight ratio of 7:3:3 to obtain a diatomite liquid; S12: Add 3 parts of sodium humate and 2 parts of silane coupling agent KH550 to 7 parts of chitosan solution, and then add 3 parts of volcanic rock and stir thoroughly to obtain a modifier; Mix the modifier and the diatomite liquid according to a weight ratio of 3:5, perform ball milling treatment. After ball milling, filter and dry to obtain a diatomite agent.

[0067] In this example, the mass fraction of the sodium silicate solution is 7%; the mass fraction of the chitosan solution is 4%.

[0068] In this example, the ball milling speed for the mixing and ball milling treatment is 1000 r / min, and ball mill for 2 h.

[0069] A highly hygroscopic slow-release fertilizer produced by the production process of a highly hygroscopic slow-release fertilizer based on resin gel in this example.

[0070] Comparative Example 1: The difference from Example 3 is that the modified plant fibers are not added.

[0071] Comparative Example 2: The difference from Example 3 is that the modified liquid is not added to the modified plant fibers.

[0072] Comparative Example 3: The difference from Example 3 is that the additive is not added to the modified liquid.

[0073] Comparative Example 4: It is different from Example 3 in that nano-attapulgite for heat preservation and biomass carbon are not added to the additive.

[0074] Comparative Example 5: It is different from Example 3 in that diatomite agent is not added.

[0075] Comparative Example 6: It is different from Example 3 in that the modifier is not added during the preparation of the diatomite agent.

[0076] The performance of Examples 1-5 and Comparative Examples 1-6 was tested, and the test results are as follows 12d Water retention rate (%) Water absorption ratio (g / g) Example 1 87.2 357.8 Example 2 88.3 362.3 Example 3 89.5 364.6 Example 4 88.4 361.3 Example 5 88.9 362.4 Comparative Example 1 72.3 312.4 Comparative Example 2 78.5 324.3 Comparative Example 3 81.3 334.7 Comparative Example 4 84.2 345.0 Comparative Example 5 74.5 317.3 Comparative Example 6 78.9 325.6 It can be concluded from Examples 1-5 and Comparative Examples 1-6 that the product of Example 3 of the present invention has excellent 12d water retention rate and water absorption ratio. When the modified plant fiber and the diatomite agent are not added to the product, the performance of the product shows an obvious downward trend. By using the synergistic combination of the two, the product performance effect is the most obvious; When the modifying liquid is not added to the modified plant fiber, the additive is not added to the modifying liquid, nano-attapulgite for heat preservation, biomass carbon are not added to the additive, and the modifier is not added during the preparation of the diatomite agent, the performance of the product shows a downward trend to varying degrees. Only when the product raw materials obtained by the method of the present invention are used, the product performance effect is the most obvious. Using other methods instead is not as effective as the present invention.

[0077] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0078] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A process for preparing a highly hygroscopic slow-release fertilizer based on resin gel, characterized in that: The following steps are involved: The modified plant fiber and the fertilizer body are mixed thoroughly in a weight ratio of 3:5, and then 10-15% of the total amount of the modified plant fiber is added with diatomaceous earth, and stirred thoroughly to obtain a highly hygroscopic slow-release fertilizer based on resin gel.

2. The process for preparing a highly hygroscopic slow-release fertilizer based on resin gel according to claim 1, characterized in that: The fertilizer body is prepared by mixing resin gel and fertilizer matrix in a weight ratio of 4:7; The fertilizer matrix is ​​5-8 parts of trace elements, 3-5 parts of water retaining agent and 10-14 parts of nitrogen, phosphorus and potassium fertilizers; The trace element is one of copper and zinc; the water retaining agent is potassium polyacrylate; and the nitrogen-phosphorus-potassium fertilizer is a mixture of nitrogen, phosphorus and potassium in a weight ratio of 2:2:

2.

3. The process for preparing a highly hygroscopic slow-release fertilizer based on resin gel according to claim 1, characterized in that: The modification method of the modified plant fiber is: S01: heat-treating the nano-attapulgite at 110-120°C for 20 min, then heating to 300°C at a rate of 1-3°C / min, keeping the temperature for 5 min, and finally cooling to 50°C at a rate of 2-4°C / min, keeping the temperature; The heat-insulated nano-attapulgite, biomass carbon and sodium citrate solution are fully mixed to obtain an additive; S02: 1-2 parts of silane coupling agent KH550, 2-3 parts of sodium carboxymethyl cellulose and 4-7 parts of titanium oxide are mixed and added into 5-8 parts of additives and stirred thoroughly to obtain a modified solution; S03: adding the coconut shell fiber into a modification liquid which is 3-5 times the total amount of the coconut shell fiber, stirring and modifying the fiber, and after the stirring is completed, filtering and drying are performed to obtain modified plant fiber.

4. The process for preparing a highly hygroscopic slow-release fertilizer based on resin gel according to claim 3, characterized in that: The mass fraction of the sodium citrate solution is 5-8%; the stirring speed of the stirring modification treatment is 450-500r / min, and the stirring is for 1h.

5. The process for preparing a highly hygroscopic slow-release fertilizer based on resin gel according to claim 3, characterized in that: The mass ratio of the heat-insulated nano-attapulgite, biomass carbon and sodium citrate solution is (5-8): (3-5):

7.

6. The process for preparing a highly hygroscopic slow-release fertilizer based on resin gel according to claim 1, characterized in that: The preparation method of diatomite agent is: S11: diatomaceous earth, 5% by mass urea solution and sodium silicate solution are uniformly mixed in a weight ratio of (5-8):3:(2-4) to obtain diatomaceous earth liquid; S12: adding 2-3 parts of sodium humate and 1-2 parts of silane coupling agent KH550 to 5-8 parts of chitosan solution, and then adding 2-4 parts of volcanic rock, stirring well, to obtain a modifier; The modifier and diatomaceous earth liquid are mixed in a weight ratio of 3:5 and subjected to ball milling. After the ball milling is completed, the mixture is filtered and dried to obtain a diatomaceous earth agent.

7. The process for preparing a highly hygroscopic slow-release fertilizer based on resin gel according to claim 6, characterized in that: The mass fraction of the sodium silicate solution is 5-8%; the mass fraction of the chitosan solution is 2-5%.

8. The process for preparing a highly hygroscopic slow-release fertilizer based on resin gel according to claim 6, characterized in that: The mixing and ball milling process was carried out at a speed of 1000 r / min for 2 h.

9. A highly hygroscopic slow-release fertilizer produced by the process for producing a highly hygroscopic slow-release fertilizer based on resin gel according to any one of claims 1 to 8.