CN109776706A - A kind of preparation method of the polypropylene dedicated amide of agricultural fertilizer - Google Patents
A kind of preparation method of the polypropylene dedicated amide of agricultural fertilizer Download PDFInfo
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- CN109776706A CN109776706A CN201711106530.4A CN201711106530A CN109776706A CN 109776706 A CN109776706 A CN 109776706A CN 201711106530 A CN201711106530 A CN 201711106530A CN 109776706 A CN109776706 A CN 109776706A
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- polypropylene
- polymerization
- phosphoric acid
- catalyst
- amide
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Abstract
The invention discloses a kind of preparation method of the polypropylene dedicated amide of agricultural fertilizer, step is that polypropylene is placed in polymer reactor, and directly stirring makes polypropylene polymerization under normal pressure, and for the thermostat temperature of polymerization between 160-270 DEG C, soaking time is 0.5-5 hours；Then catalyst phosphoric acid is added by the way of disposably adding or being slowly added into material, continues to polymerize in polymer reactor under normal pressure, for the thermostat temperature of polymerization between 160-230 DEG C, soaking time is 0.5-5 hours；Last alkaline hydrolysis.The mass parts ratio of polypropylene and catalyst phosphoric acid are as follows: 100: 1-35, phosphoric acid is the phosphoric acid that content is 85%.Method of the invention can guarantee the mobility of material, avoid material agglomeration problems, may be implemented to produce on a large scale.Phosphate anion in catalyst is nutrient required for plant growth, does not need separating catalyst, eliminates the processes such as washing, simplifies production procedure, reduce manufacturing cost.
Description
Technical field
The present invention relates to a kind of preparation methods of the polypropylene dedicated amide of agricultural fertilizer.
Background technique
Proved according to scientific worker's years of researches, reasonable economic fertilization, be crop yield increase matter important measures it
One, therefore fertilising is the material base of high yield and high quality.But utilization rate of fertilizer is low to annoying always numerous agriculturists.
Polyacrylamide is a kind of polymer of amino acid, it is in addition to the property with water-soluble polymeric carboxylic acid, and there are also poles
Degradable characteristic is the environmentally friendly chemicals that a kind of purposes is extremely wide, nontoxic, pollution-free, degradable.Difference point
The polyacrylamide of son amount can be widely applied to the fields such as water process, fertilizer synergist, washing assisant, cosmetics, hydrogel.It is poly-
Acrylamide is as a kind of fertilizer synergist, its excellent performance gradually get people's approval.
Technology is all that catalyst just is added at the initial stage of reaction and polymerization reaction is made to accelerate at present, due to polymerizeing amino
Moisture can be deviate from when acid polymerization, in addition the moisture that catalyst is brought into, these moisture can all enter material, to cause material tacky
Agglomeration, and so that material is gradually hardened with steaming in the slave material of moisture, therefore, it is difficult to realize large-scale industrial production.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of economical and efficient, it is suitable for the agriculture polyacrylamide applied
Amine preparation method, prepared Molecular Weight for Polyacrylamide is in 5000-50000.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
A kind of preparation method of the polypropylene dedicated amide of agricultural fertilizer, raw materials used is polypropylene, is included the following steps
The first step, preliminary polymerization
Polypropylene is placed in polymer reactor, directly stirring makes polypropylene polymerization under normal pressure, and the thermostat temperature of polymerization exists
Between 160-270 DEG C, soaking time is 0.5-5 hours；
Second step, catalytic polymerization
Add catalyst phosphoric acid into the material reacted through the first step, continue to polymerize in polymer reactor under normal pressure, polymerize
Thermostat temperature between 160-230 DEG C, soaking time be 0.5-5 hours；
Third step, alkaline hydrolysis obtain the polypropylene dedicated amide of agricultural, and molecular weight is between 5000-50000.
It is of the invention further the specific scheme is that the polypropylene and catalyst phosphoric acid mass parts ratio are as follows: 100: 1-
35.That is the additional amount of phosphoric acid rests between the mass fraction 1~35% of pp material.
Of the invention is further the specific scheme is that the catalyst phosphoric acid is the food-grade or technical grade phosphorus that content is 85%
Acid.
It is of the invention further the specific scheme is that catalyst phosphoric acid addition manner by the way of once adding or with
Reaction is slowly added to.
By adopting the above-described technical solution, the technological progress achieved by the present invention is:
The technical scheme is that first make polypropylene in the case where no catalyst direct polymerization to a certain extent after,
Catalyst phosphoric acid is added, polymerization reaction is made to continue that polyacrylamide is made.The major advantage of the method is: passing through first
The polymerization of step, most of material have been dehydrated, and using 160-270 DEG C of high temperature evaporation, the water largely deviate from is from object
It is steamed in material；Catalyst is added at this time to continue to polymerize, polymerize generated water at this time and substantially reduces, to ensure that material
Mobility avoids material agglomeration problems.Solve in the prior art due to the initial stage in polymerization reaction be just added catalyst into
Row fast reaction and the rapid dehydration that occurs and when material the drawbacks of becoming sticky, agglomerating, may be implemented to produce on a large scale.
Selecting phosphoric acid to do the advantage of catalyst is: firstly, phosphoric acid as catalyst select content for 85% food-grade or
PHOSPHORIC ACID TECH.GRADE, not only raw material is easy to get, and phosphoric acid is finally present in product in the form of phosphate anion, and phosphate anion is just
It is well nutrient required for plant growth, so not needing separating catalyst, eliminates the processes such as washing, simplify production
Process reduces manufacturing cost.In addition, being not only able to accelerate reaction speed, and obtained poly- third using phosphoric acid does catalyst
The molecular weight ranges of acrylamide are big, and molecular weight is just being suitable within the scope of the 5000-50000 that crops use.Catalyst
The additional amount of phosphoric acid is conducive to reaction for the 1~35% of polypropylene mass fraction and carries out, and is suitable for the ratio agriculturally used.
It is also to use when remanufacturing chemical fertilizer because polyacrylamide is all by the way of aqueous solution when agriculturally applying
The mode of aqueous solution is added in chemical fertilizer, and technical solution of the present invention is directly made by the way of hydrolysis after catalytic polymerization
The aqueous solution of final products --- polyacrylamide, can be directly used for agricultural production.Therefore dry process is omitted, further
Process is shortened, production cost is reduced.
The above acquired technological progress reduces conjunction in guarantee product under the premise of agriculturally using effect
Requirement at process to equipment, reduces equipment investment, shortens production procedure, improves yield, reduces into
This, is a kind of polyacrylamide preparation method of economical and efficient.Catalyst phosphoric acid be slowly added to be conducive to reaction it is smooth into
Row.
Specific embodiment
The present invention is described in further details below with reference to specific embodiment:
Embodiment 1
Under condition of normal pressure, 50.0KgL- polypropylene is added in kneader, revolving speed is 20 revs/min, same in whipping process
Shi Shengwen, after ten minutes, intracavitary temperature of charge reach 180 DEG C, and constant temperature 30 minutes, evaporate partial moisture at 180 DEG C.Then
It is slowly added to phosphoric acid (technical grade) 0.5Kg in 60 minutes, stops heating after continuing constant temperature 30 minutes, polymerization terminates.By the production
Object is cooling, and water and potassium hydroxide is added to hydrolyze, and obtaining solid content is 40% polyacrylamide solution.
The molecular weight for being detected polyacrylamide is 5000.The detection of molecular weight product in example, commission section, Hebei province
Institute's energy is detected, similarly hereinafter.
Embodiment 2
Under condition of normal pressure, 50.0KgL- polypropylene is added in pan dryer, revolving speed is 20 revs/min, whipping process
In heat up simultaneously, after ten minutes, intracavitary temperature of charge reaches 200 DEG C, constant temperature 90 minutes at 200 DEG C.It is added at one time phosphoric acid
(technical grade) 5Kg stops heating after continuing constant temperature 120 minutes, and polymerization terminates.The product is cooling, add water and sodium hydroxide water
Solution, obtaining solid content is 40% polyacrylamide solution.
The molecular weight for being detected polyacrylamide is 18000.
Claims (1)
1. a kind of preparation method of the polypropylene dedicated amide of agricultural fertilizer, raw materials used is polypropylene, it is characterised in that: including walking as follows
Polypropylene is placed in polymer reactor by the rapid first step, preliminary polymerization, and directly stirring makes polypropylene polymerization, the perseverance of polymerization under normal pressure
For temperature between 160-270 DEG C, soaking time is 0.5-5 hours；Second step, catalytic polymerization is to the material reacted through the first step
In plus catalyst phosphoric acid, the mass parts ratio of the polypropylene and catalyst phosphoric acid are as follows: 100: 1-35, in polymerization reaction under normal pressure
Continue to polymerize in device, for the thermostat temperature of polymerization between 160-230 DEG C, soaking time is 0.5-5 hours；Third step adds buck
Solution obtains the polypropylene dedicated amide of agricultural.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711106530.4A CN109776706A (en) | 2017-11-10 | 2017-11-10 | A kind of preparation method of the polypropylene dedicated amide of agricultural fertilizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711106530.4A CN109776706A (en) | 2017-11-10 | 2017-11-10 | A kind of preparation method of the polypropylene dedicated amide of agricultural fertilizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109776706A true CN109776706A (en) | 2019-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711106530.4A Pending CN109776706A (en) | 2017-11-10 | 2017-11-10 | A kind of preparation method of the polypropylene dedicated amide of agricultural fertilizer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666470A (en) * | 2020-05-14 | 2021-11-19 | 迪睿合株式会社 | Wastewater treatment agent and method for producing wastewater treatment agent |
-
2017
- 2017-11-10 CN CN201711106530.4A patent/CN109776706A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113666470A (en) * | 2020-05-14 | 2021-11-19 | 迪睿合株式会社 | Wastewater treatment agent and method for producing wastewater treatment agent |
| CN113666470B (en) * | 2020-05-14 | 2024-04-23 | 迪睿合株式会社 | Wastewater treatment agent and method for producing wastewater treatment agent |
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| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
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Application publication date: 20190521 |