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Method for producing long-acting drip agent for agricultural polyethylene film

A polyethylene film and a production method technology, applied in the field of dripping agent, can solve the problems of short duration of effect, mildew damage to seeds and vegetable fruits, and rotten vegetable cores and rhizomes, and achieve high transparency, suitable migration rate, Long lasting effect

Active Publication Date: 2013-04-03
HANGZHOU BEISHENG POLYMERMATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The surface of agricultural polyethylene film is easy to adhere or condense water mist and water droplets, which reduces the transparency, reduces the sunlight flux, affects the photosynthesis effect, is not conducive to the growth of greenhouse crops, and the formation and dripping of water droplets will also cause vegetables in greenhouses. If it is used to preserve seeds and fruits and vegetables to keep them fresh, water droplets will cause mildew and damage to seeds and vegetables and fruits. Therefore, it is of great practical significance to produce an anti-fog droplet agricultural polyethylene film.
The dripping agent is added to the polyethylene film by the internal addition method. Due to the poor compatibility between the two, the dripping agent quickly migrates to the surface of the film and is lost. The effective period is short, generally about three months.
CN1152603 discloses " anti-fogging and waterproof dripping agent and its production method " is to use the product of reaction of alkylamine compound and ethylene oxide as main agent, with the product of polyhydric alcohol, fatty acid and catalyst reaction as auxiliary agent, and then The above-mentioned main agent and auxiliary agent are compounded into anti-fog and waterproof dripping agent. The raw materials of this product are relatively simple, the cost is low, and the early effect is acceptable. Because the synergistic matching of long-chain molecular and short-chain molecular raw materials is not paid much attention to in the ingredients, short duration

Method used

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  • Method for producing long-acting drip agent for agricultural polyethylene film
  • Method for producing long-acting drip agent for agricultural polyethylene film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1 (referring to the raw material of Table 1 corresponding to Example 1 and the proportion by weight thereof): 380 parts of polyethylene glycols, 270 parts of stearic acids, 3 parts of p-toluenesulfonic acid are added to the reactor, and all valves are closed, Heat up, stir after the mixture is fully melted, vacuumize to minus 0.1Mpa, heat up to 150°C, stir for 4h, measure the acid value of 2-4, terminate the reaction, cool and discharge to obtain catalyst; first, 140 parts of paste-like The hydrogenated tallow-based primary amine was heated and melted and added to the reaction kettle, then heated to 120°C, vacuumed (-0.1Mpa), filled with nitrogen, heated to 145°C in a nitrogen atmosphere, and then slowly added in 20-30min. 40 parts of ethylene oxide, fully stirred, the reaction was carried out at 168-175 ℃ and 2.5kg pressure, after all the ethylene oxide was added, the insulation was delayed for 10min, and the main agent was N,N- Bis(2-hydroxyethyl)alkylamine...

Embodiment 11

[0018] Example 11 (refer to Table 2 for the corresponding example raw materials and their proportions by weight): 420 parts of main agent, 1300 parts of synergist and 120 parts of catalyst were added to the reaction kettle, and the temperature was raised to 105°C while stirring, stirred for 1 h and pumped. Vacuum dry until it is suitable for slicing or granulation, cool down and discharge, after slicing or granulating, inspect and package.

[0019] For the remaining examples 12-19, refer to the raw materials of the corresponding examples in Table 2 and their proportions by weight.

[0020] In this method, in order to reduce costs, industrial-grade chemical raw materials are used for the raw materials that do not affect the transparency of the film, and analytical pure materials are used as far as possible for the raw materials that affect the transparency. While using lipophilic long carbon chain N,N-bis(2-hydroxyethyl) alkylamine as the main agent, a synergist with short carb...

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Abstract

The invention discloses a method for producing a long-acting drip agent for an agricultural polyethylene film. The method comprises the following five steps: preparing materials, wherein the first group of materials comprise polyethylene glycols, stearic acid and a p-toluenesulfonic acid for preparing a catalyst, the second group of materials comprise hydrogenated tallow alkyls and ethylene oxides for preparing a main agent, and the third group of materials comprise sorbitan tristearate and glyceryl monostearate for preparing a synergic agent; after the catalyst, the main agent and the synergic agent are respectively prepared by using the raw materials, adding 420-480 parts by weight of main agent, 1300-1400 parts by weight of synergic agent and 120-160 parts by weight of catalyst into a reaction kettle; carrying out stirring and synthetic reaction for 1 hour at the temperature of 105 DEG C; and carrying out vacuum drying, emptying, and slicing or granulating so as to obtain the long-acting drip agent. The drip agent is used as an addition agent for producing the agricultural polyethylene film, and has the advantages of small hydrophilic-lipophilic balance (HLB) value, appropriatedrip agent migration rate and better primary effectiveness and durability; the effectiveness-persisting period of the drip agent can reach 5-6 months; and through adjusting the proportions of partialraw materials, the long-acting drip agent can be respectively used for producing agricultural polyethylene films suitable for the southern or northern climate.

Description

technical field [0001] The invention relates to a production method of a dripping agent for producing agricultural polyethylene film as an auxiliary agent. Background technique [0002] The surface of agricultural polyethylene film is easy to adhere or condense water mist and water droplets, which reduces transparency, reduces sunlight flux, affects the effect of photosynthesis, and is not conducive to the growth of greenhouse crops. The formation and dripping of water droplets will also cause greenhouse vegetables. Mildew of the core and vegetable root, if used for preservation of seeds and fruits and vegetables, water droplets will cause mildew damage to seeds and vegetables. Therefore, it is of great practical significance to produce an agricultural polyethylene film with anti-fog droplet properties. The dripping agent is added to the polyethylene film by the internal addition method. Due to the poor compatibility of the two, the dripping agent quickly migrates to the sur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08K5/00C08K5/17C08K5/1535C08K5/103
Inventor 章德永
Owner HANGZHOU BEISHENG POLYMERMATERIAL
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