阅读说明：本技术 一种聚氨酯包膜尿素的表面处理方法及聚氨酯包膜尿素 (A kind of surface treatment method and polyurethane coated urea of polyurethane coated urea ) 是由 李峰 刘学文 朱志华 张建军 张广杰 刘进波 于 2019-08-05 设计创作，主要内容包括：本发明适用于化肥工业领域,公开了一种聚氨酯包膜尿素的表面处理方法及聚氨酯包膜尿素,方法包括以下步骤：将木质素材料和木醋液改性剂混合溶解制备得到木醋液改性木质素溶液；对尿素进行筛分得到尿素颗粒,并投入1号转筒设备加热得到待处理尿素颗粒；向1号转筒设备中内的待处理尿素颗粒喷淋木醋液改性木质素溶液得到待包膜尿素颗粒；将待包膜尿素颗粒转移至2号转筒设备,并向待包膜尿素颗粒添加聚氨酯包膜材料包膜得到聚氨酯包膜尿素；将聚氨酯包膜尿素筛分得到聚氨酯包膜尿素颗粒。本发明所提供的其可填补尿素颗粒表面低凹部分,使尿素颗粒表面光滑圆润,利于进行聚氨酯包膜,使所制得的聚氨酯包膜尿素,具有良好的控释效果,且包膜成本低。(The present invention is suitable for chemical fertilizer industry field, the surface treatment method and polyurethane coated urea of a kind of polyurethane coated urea are disclosed, method is the following steps are included: be prepared wood vinegar modified lignin resin solution for lignin material and wood vinegar modifying agent mixed dissolution；Urea is sieved to obtain urea granules, and puts into No. 1 rotating cylinder equipment and heats to obtain urea granules to be processed；Urea granules to be processed spray wood vinegar modified lignin resin solution in into No. 1 rotating cylinder equipment is obtained to coated carbamide particle；No. 2 rotating cylinder equipment will be transferred to coated carbamide particle, and to material coated obtaining polyurethane coated urea to the addition of coated carbamide particle is polyurethane coated；Polyurethane coated urea is sieved to obtain polyurethane coated urea granules.Provided by the present invention its can fill up urea granules surface depressed portions, keep urea granules surface smooth mellow and full, polyurethane coated conducive to carrying out, and make obtained polyurethane coated urea, have good controlled-release effect, and coating is at low cost.)

1. a kind of surface treatment method of polyurethane coated urea, which comprises the following steps:

S1, wood vinegar modified lignin resin solution is prepared in lignin material and wood vinegar modifying agent mixed dissolution；

S2, urea is sieved to obtain urea granules, and the urea granules No. 1 rotating cylinder equipment of investment is heated to obtain wait locate Manage urea granules；

The urea granules to be processed in No. 1 rotating cylinder equipment of S3, Xiang Suoshu spray the wood vinegar modified lignin resin solution It obtains to coated carbamide particle；

S4, No. 2 rotating cylinder equipment are transferred to from No. 1 rotating cylinder equipment to coated carbamide particle by described, and to described to coating Urea granules add polyurethane coated material progress coating and obtain polyurethane coated urea；

S5, polyurethane coated urea is sieved to obtain polyurethane coated urea granules.

2. a kind of surface treatment method of polyurethane coated urea as described in claim 1, which is characterized in that in step S1 In, the lignin material and the wood vinegar modifying agent are that the ratio of 1:9 carries out mixed dissolution in mass ratio.

3. a kind of surface treatment method of polyurethane coated urea as described in claim 1, which is characterized in that in step S2 In, the partial size of the urea granules is 2.0-4.75mm.

4. a kind of surface treatment method of polyurethane coated urea as described in claim 1, which is characterized in that in step S2 In, the heating operation of the urea granules are as follows: No. 1 rotating cylinder equipment of Xiang Suoshu is passed through 50-100 DEG C of hot-air to the urea Grain preheating 5-10min, makes 30-60 DEG C of surface temperature of the urea granules.

5. a kind of surface treatment method of polyurethane coated urea as described in claim 1, which is characterized in that in step S3 In, the material particles quality for spraying the wood vinegar modified lignin resin solution to the urea granules to be processed is 1%-5%, spray Drenching number is 2 times, and 10-15min is divided between spray.

6. a kind of surface treatment method of polyurethane coated urea as claimed in claim 5, which is characterized in that the wood vinegar During modified lignin resin solution spraying, continue to be passed through 50-100 DEG C of hot-air to No. 1 rotating cylinder equipment, and control described 1 The revolving speed of number rotating cylinder equipment is 10-20r/min.

7. a kind of surface treatment method of polyurethane coated urea as claimed in claim 6, which is characterized in that by described wait wrap Film urea granules are transferred to the condition of No. 2 rotating cylinder equipment from No. 1 rotating cylinder equipment are as follows: the surface to coated carbamide particle Temperature is 80-90 DEG C.

8. a kind of surface treatment method of polyurethane coated urea as described in claim 1, which is characterized in that in step S4 In, the material particles quality of the polyurethane coated material is 2%-5%.

9. a kind of surface treatment method of polyurethane coated urea as claimed in claim 8, which is characterized in that described No. 2 turn The revolving speed of cylinder device is 20-60r/min, and processing time of the coated carbamide particle in No. 2 rotating cylinder equipment is 5- 15min。

10. a kind of polyurethane coated urea, which is characterized in that use polyurethane packet as claimed in any one of claims 1-9 wherein The surface treatment method of film urea is prepared.

Technical field

The invention belongs to chemical fertilizer industry field more particularly to the surface treatment methods and poly- ammonia of a kind of polyurethane coated urea Ester coated carbamide.

Background technique

With social development, the increase of human cost, controlled availability fertilizer increasingly obtains customer acceptance, wherein to polyurethane control It is increasing to release coated fertilizer demand, general plant produced obtains granular urea rough surface, easily causes when polyurethane coated It is coated imperfect, causes initial stage nutrient release rate to greatly increase, in order to avoid this problem, it is necessary to urea repeat more Secondary coating, for film-coated technique, this adds increased coating costs, and productivity reduces.So if bulky grain is urinated Plain smooth in appearance and mellow and full, productivity, which not only can be improved, reduces production cost, but also has beautified granular urea exterior quality, It enhances one's market competitiveness.Therefore how the smoothness on surface is improved to reduce coating dosage be that there is an urgent need to solve to urea pre-treatment Certainly the problem of.

US6039781 and US6663686 all refers to a kind of particle surface recovery technique, be respectively by linseed oil+clay/ After the mixing of the binders such as diatomite or paraffin or urea and/or ammonium nitrate adding additives are coated on fertile wicking surface to make up fertilizer The various defects on surface reduce coating defect by this technological means, reduce nitrogen initial dissolution rate, but above-mentioned technology It is related to being coated with new material in fertilizer surface, increases cost simultaneously, also have higher requirement to paint-on technique, in addition coat Dosage and improvement are also limited.

CN101659583A discloses a kind of post-processing approach of granulated fertilizer, and granulated fertilizer is placed in rotary drum and is moved Afterwards, urea and/or ammonium nitrate adding additives coating fluid are coated on granulated fertilizer surface, are drying to obtain.Although sprayed on material does not have Novel substance is added, but binder, it is easier that granulated fertilizer generates agglomeration, and coating material usage amount is big, and production cost increases Add.

CN104496566 is used and preparation a certain concentration of formaldehyde/or ureaformaldehyde aqueous solution, requires to granule strength, Although not introducing any other new substance, corresponding coating using polyurethane coated, coating material itself can and packet One of film material isocyanates can react when heated, reduce coated release-controlled effect instead, while also increasing cost.

Summary of the invention

The present invention is directed at least solve one of above-mentioned technical problem, a kind of surface treatment of polyurethane coated urea is provided Method and polyurethane coated urea can fill up urea granules surface depressed portions, keep urea granules surface smooth mellow and full, are conducive to It carries out polyurethane coated, makes polyurethane coated urea obtained, there is good controlled-release effect, and coating is at low cost.

The technical scheme is that a kind of surface treatment method of polyurethane coated urea, comprising the following steps:

S1, wood vinegar modified lignin resin solution is prepared in lignin material and wood vinegar modifying agent mixed dissolution；

S2, urea is sieved to obtain urea granules, and the urea granules No. 1 rotating cylinder equipment of investment is heated to obtain Urea granules to be processed；

The urea granules to be processed in No. 1 rotating cylinder equipment of S3, Xiang Suoshu spray the wood vinegar modified lignin resin Solution is obtained to coated carbamide particle；

S4, No. 2 rotating cylinder equipment are transferred to from No. 1 rotating cylinder equipment to coated carbamide particle by described, and to it is described to Coated carbamide particle adds polyurethane coated material progress coating and obtains polyurethane coated urea；

S5, polyurethane coated urea is sieved to obtain polyurethane coated urea granules.

Optionally, in step sl, the lignin material and the wood vinegar modifying agent are the ratio of 1:9 in mass ratio Carry out mixed dissolution.

Optionally, in step s 2, the partial size of the urea granules is 2.0-4.75mm.

Optionally, in step s 2, the heating operation of the urea granules are as follows: No. 1 rotating cylinder equipment of Xiang Suoshu is passed through 50- 100 DEG C of hot-air preheats 5-10min to the urea granules, makes 30-60 DEG C of surface temperature of the urea granules.

Optionally, in step s3, the wood vinegar modified lignin resin solution is sprayed to the urea granules to be processed Material particles quality is 1%-5%, and spray number is 2 times, and 10-15min is divided between spray.

Optionally, during the wood vinegar modified lignin resin solution spraying, continue to be passed through 50- to No. 1 rotating cylinder equipment 100 DEG C of hot-air, and the revolving speed for controlling No. 1 rotating cylinder equipment is 10-20r/min.

Optionally, by the condition for being transferred to No. 2 rotating cylinder equipment from No. 1 rotating cylinder equipment to coated carbamide particle Are as follows: the surface temperature to coated carbamide particle is 80-90 DEG C.

Optionally, in step s 4, the material particles quality of the polyurethane coated material is 2%-5%.

Optionally, the revolving speed of No. 2 rotating cylinder equipment is 20-60r/min, and the coated carbamide particle turns at described No. 2 The processing time in cylinder device is 5-15min.

The present invention also provides a kind of polyurethane coated urea, using the surface treatment side of above-mentioned polyurethane coated urea Method is prepared.

The surface treatment method and polyurethane coated urea of a kind of polyurethane coated urea provided by the present invention, by matching Wood vinegar modified lignin resin solution is set, and by wood vinegar modified lignin resin solution spraying to urea, due to the effect of wood vinegar So that lignin is obtained the expansion of bulk molecular structure, and destroy the hydrogen bond between lignin molecule internal hydroxyl groups, makes intramolecular and molecule Between hydrogen bond action disappear, the modified wooden solution of wood vinegar can the smooth fine and close urea granules surface that is bonded in form coating, fill out Urea granules surface depressed portions are mended, urea granules surface is made to become smooth mellow and full, then pass through the polyurethane material of sprinkling atomization Coating is carried out to the urea granules through wood vinegar modified lignin resin solution, coating rate can be reduced, and polyurethane coated effect is good, makes There is polyurethane coated urea obtained good controlled-release effect to need to increase by one compared to traditional polyurethane coated technique A coating rotating cylinder equipment, production cost is low, easy to operate.

Detailed description of the invention

It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to needed in the embodiment Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached Figure.

Fig. 1 is a kind of flow chart of the surface treatment method of polyurethane coated urea provided in an embodiment of the present invention.

Specific embodiment

In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.

Described each particular technique feature and each embodiment in a specific embodiment, in the case of no contradiction, It can be combined in any appropriate way, such as can be with shape by different particular technique feature/embodiment combinations At different embodiments, in order to avoid unnecessary repetition, each the various of particular technique feature/embodiment can in the present invention No further explanation will be given for the combination of energy.

As shown in Figure 1, a kind of surface treatment method of polyurethane coated urea provided in an embodiment of the present invention, including it is following Step:

S1, wood vinegar modified lignin resin solution is prepared in lignin material and wood vinegar modifying agent mixed dissolution；

S2, urea is sieved to obtain urea granules, and the urea granules No. 1 rotating cylinder equipment of investment is heated to obtain Urea granules to be processed；

The urea granules to be processed in No. 1 rotating cylinder equipment of S3, Xiang Suoshu spray the wood vinegar modified lignin resin Solution is obtained to coated carbamide particle；

S4, No. 2 rotating cylinder equipment are transferred to from No. 1 rotating cylinder equipment to coated carbamide particle by described, and to it is described to Coated carbamide particle adds polyurethane coated material progress coating and obtains polyurethane coated urea；

S5, polyurethane coated urea is sieved to obtain polyurethane coated urea granules.

Method of the invention is modified by the way that wood vinegar is prepared in lignin material and wood vinegar modifying agent mixed dissolution Lignin liquor is unfolded the bulk molecular structure of lignin using wood vinegar, and destroys between lignin molecule internal hydroxyl groups Hydrogen bond, so that intramolecular and intermolecular hydrogen bond action is disappeared, when by wood vinegar modified lignin resin solution spraying to urea granules, Smooth, the fine and close surface for being adhered to urea granules of wood vinegar modified lignin resin solution forms coating, has filled up urea granules table Face depressed portions are so that the surface of urea granules becomes smooth mellow and full, when carrying out polyurethane coated to urea granules, favorably It is uniformly wrapped in urea granules outer surface in polyurethane material, coating effect is good, and reduces coating rate, makes the poly- ammonia being prepared into Ester coated carbamide has good controlled-release effect.

Optionally, in step sl, the lignin material and the wood vinegar modifying agent are the ratio of 1:9 in mass ratio Carry out mixed dissolution, dissolution conditions are as follows: under the conditions of 20-30 DEG C (room temperature), stir with the speed of 40-60r/min mixed solution 2h is mixed, fully reacting is carried out.

Specifically, lignin material uses industrial lignin or natural lignin, and the mass percent of lignin is 40%-60%.

Specifically, wood vinegar modifying agent be using by after rice straw impurity elimination, crushing on continuous pyrolysis reaction unit it is hot Solution temperature is the wood vinegar being pyrolyzed at 400 DEG C, and pH value 2.37, moisture content 90.30%, main component is acid Class, phenols, ketone etc..

Optionally, in step s 2, the partial size of the urea granules is 2.0-4.75mm, by the grain for optimizing urea granules Diameter avoids urea granules too small, polyurethane material bring viscous force when cannot overcome coating, is easy to produce conglomeration and bonding is existing As causing coated fertilizer to be difficult to disperse, manufactured product slow release effect is poor；Alternatively, prevent urea granules excessive, when coating poly- ammonia Ester material is uneven to the package of urea granules, causes slow release effect unstable.

Specifically, the partial size of the urea granules is 2.4-4mm, and the nitrogen content of the urea granules is greater than or equal to 46.2%.

Optionally, in step s 2, the heating operation of the urea granules are as follows: No. 1 rotating cylinder equipment of Xiang Suoshu is passed through 50- 100 DEG C of hot-air preheats 5-10min to the urea granules, makes 30-60 DEG C of surface temperature of the urea granules.Pass through Urea granules are preheated, when spraying wood vinegar modified lignin resin solution for the first time, are conducive to wood vinegar modified lignin resin solution In conjunction with urea granules.

Optionally, in step s3, the wood vinegar modified lignin resin solution is sprayed to the urea granules to be processed Material particles quality is 1%-5%, and spray number is 2 times, and 10-15min is divided between spray.

Optionally, during the wood vinegar modified lignin resin solution spraying, continue to be passed through 50- to No. 1 rotating cylinder equipment 100 DEG C of hot-air, and the revolving speed for controlling No. 1 rotating cylinder equipment is 10-20r/min.Wood vinegar modified lignin resin solution exists It is easier in conjunction with urea under heating condition, so that the depressed portions on urea granules surface are effectively filled up, urea granules surface light Cunning is mellow and full.

Optionally, by the condition for being transferred to No. 2 rotating cylinder equipment from No. 1 rotating cylinder equipment to coated carbamide particle Are as follows: the surface temperature to coated carbamide particle is 80-90 DEG C.

Optionally, in step s 4, it is urinated described in by way of atomized spray into No. 2 rotating cylinder equipment to coating Crude granule adds polyurethane coated material and carries out coating.

Specifically, polyurethane coated material is including being the pure and mild polyisocyanates of polyester polyols, at 80-90 DEG C of reaction temperature Start to react, urea granules are wrapped up.

Specifically, during coating, 50-100 DEG C of hot-air is passed through to No. 2 rotating cylinder equipment, it will be to coated carbamide particle Temperature is maintained within the scope of 80-90 DEG C, is conducive to coating reaction and is normally carried out, it is good to improve coating effect.

Optionally, the material particles quality of the polyurethane coated material is 2%-5%.

Optionally, the revolving speed of No. 2 rotating cylinder equipment is 20-60r/min, and the coated carbamide particle turns at described No. 2 The processing time in cylinder device is 5-15min.

Practical application, the hot-air for being passed through No. 1 rotating cylinder equipment and No. 2 rotating cylinder equipment is dry hot-air.

Optionally, the partial size of the polyurethane coated urea granules is 2.0-4.75mm after screening.

The present invention also provides a kind of polyurethane coated urea, using the surface treatment side of above-mentioned polyurethane coated urea Method is prepared, and surface is smooth mellow and full, and appearance condition is good, has good controlled-release effect.After application can slow release nutrient, The loss for reducing Nitrogen element improves the validity and persistence of polyurethane coated urea fertilizer application.

A kind of surface treatment method and polyurethane coated urea of polyurethane coated urea provided by the embodiment of the present invention, By configuring wood vinegar modified lignin resin solution, and by wood vinegar modified lignin resin solution spraying to urea, due to wood vinegar Effect so that lignin is obtained the expansion of bulk molecular structure, and destroy the hydrogen bond between lignin molecule internal hydroxyl groups, make intramolecular And intermolecular hydrogen bond action disappears, the modified wooden smooth fine and close urea granules surface formation that is bonded in of solution energy of wood vinegar applies Layer, and viscosity promotes 300% or more, has filled up urea granules surface depressed portions, urea granules surface is made to become smooth mellow and full, Coating is carried out to the urea granules through wood vinegar modified lignin resin solution by the polyurethane material of sprinkling atomization again, reduces packet Clothing rate, and polyurethane coated effect is good, so that polyurethane coated urea obtained is had good controlled-release effect, compared to traditional Polyurethane coated technique, it is only necessary to increase a coating rotating cylinder equipment, production cost is low, easy to operate.

It is illustrated combined with specific embodiments below.

S10, lignin material and wood vinegar modifying agent mixed dissolution are prepared by wood vinegar modification by the ratio of 1:9 Lignin liquor, dissolution conditions are as follows: at a temperature of 24 DEG C, 2h is stirred with the revolving speed of 50r/min；

S20, urea is sieved to obtain the urea granules that partial size is 0.45mm, the urea granules is put into No. 1 and are turned It is passed through 80 DEG C of hot-air in cylinder device and into No. 1 rotating cylinder equipment to preheat urea granules, urea granules is made to obtain surface Temperature is 40 DEG C, and during which, No. 1 rotating cylinder equipment is with the rotational speed of 15r/min；

S30, urea granules then interior into No. 1 rotating cylinder equipment spray the wood vinegar that material particles quality is 2% Modified lignin resin solution 2 times, it is divided into 15min between spray, continues to be passed through 80 DEG C of hot-air into No. 1 rotating cylinder equipment during spray Heat etc. until the surface temperature of urea granules reaches 80 DEG C, and No. 1 rotating cylinder equipment continues to turn with the revolving speed of 1515r/min It is dynamic；

S40, the urea granules of No. 1 rotating cylinder equipment are transferred to No. 2 rotating cylinder equipment, and are passed through 80 into No. 2 rotating cylinder equipment DEG C hot-air, into No. 2 rotating cylinder equipment, sprinkling is atomized polyurethane coated material and carries out to urea granules by way of sprinkling Coating obtains polyurethane coated urea, and the revolving speed of No. 2 rotating cylinder equipment is 45r/min, place of the urea granules in No. 2 rotating cylinder equipment The reason time is 10min；

S50, polyurethane coated urea is sieved to obtain polyurethane coated urea granules.

Wherein, total group of polyurethane coated urea is divided into 100 parts (by mass).