A kind of preparation method of multifunctional thin film

Abstract

The invention discloses a method for preparing a multifunctional film, which relates to a method for preparing a film. The present invention aims to solve the problems of slow degradation rate, insufficient degradation, low film-forming property, permeability and moisture retention of the existing mulch film due to the small amount of chitosan added, and solves the problems of graphene oxide flakes in the existing mulch film. Layer agglomeration and stacking affect film properties, and graphene oxide is easily soluble in water and easily reacts with other substances. It solves the problem that the mechanical properties of the existing mulch film decrease after adding trace elements, and solves the problem that the existing PVA mulch film cannot reach PE. A question of mulch performance levels. 1. Preparation of membrane solution; 2. Film formation. The invention is used for the preparation of multifunctional thin films.

Description

technical field

[0001] The present invention relates to a method for preparing a thin film. Background technique

[0002] In the middle of the 20th century, with the development of the plastics industry, Japan and some countries in Europe and the United States applied plastic films to agricultural production. Our country began to study this kind of technology in the 1970s, and it was officially applied to agricultural production in the 1980s, and came from behind. In 1985, the area covered by plastic film ranked first in the world. It is currently popularized and applied in 31 provinces, municipalities and autonomous regions across the country. It is used on more than 40 crops such as grain, cotton, oil, vegetables, melons and fruits, tobacco, sugar, medicine, hemp, tea, forests, etc., and generally increases the yield of crops by 30%~ 50%, value-added 40% to 60%, welcomed by the majority of farmers. Plastic film can mainly suppress weeds, increase surface temperature, red...

Examples

specific Embodiment approach 1

[0033] Specific embodiment one: the preparation method of a kind of multifunctional thin film of present embodiment, it is to carry out according to the following steps:

[0034] 1. Preparation of membrane solution:

[0035]①. Under the condition that the stirring speed is 300rpm~600rpm and the temperature is 50°C~90°C, put the polyvinyl alcohol powder into distilled water and stir for 10min~30min to obtain solution A; the quality of the polyvinyl alcohol powder is the same as The volume ratio of distilled water is 1g:(80~85)mL;

[0036] ②. Under the condition that the stirring speed is 300rpm~600rpm and the temperature is 50℃~90℃, add chitosan powder into solution A, and continue stirring for 5min~15min to obtain solution B; The mass ratio of alcohol powder to chitosan powder is 1:(0.5~4);

[0037] ③. Under the condition that the stirring speed is 300rpm~600rpm and the temperature is 50℃~90℃, add glacial acetic acid dropwise to solution B, and continue stirring for 5min~15m...

specific Embodiment approach 2

[0051] Specific embodiment two: what this embodiment is different from specific embodiment one is: the chitosan powder described in step one 2. is specifically prepared according to the following steps:

[0052] a. Extract chitin from fish scales: wash the fish scales repeatedly to remove surface attachments, put them into an electric heating constant temperature blast drying box to obtain dry fish scales; at room temperature and under stirring conditions, immerse 5g of dry fish scales in a concentration of 1mol / L of HCl solution reacted for 30 minutes, poured out the acid solution after the reaction, washed with water until the washing solution was neutral, then immersed in NaOH with a concentration of 1mol / L, and bathed in water at a temperature of 70°C for 7 minutes, poured out the alkali solution after the reaction , washed twice with water, and then adjusted the solution to be neutral with a pH meter, and filtered with suction to obtain crude chitin; KMnO with a concentra...

specific Embodiment approach 3

[0054] Specific embodiment three: the difference between this embodiment and one of specific embodiments one to two is that the mass ratio of polyvinyl alcohol powder and chitosan powder described in step 1. is 1:(1.5~4). Others are the same as the specific embodiment 1 to 2.

technical field

[0001] The present invention relates to a method for preparing a thin film. Background technique

[0002] In the middle of the 20th century, with the development of the plastics industry, Japan and some countries in Europe and the United States applied plastic films to agricultural production. Our country began to study this kind of technology in the 1970s, and it was officially applied to agricultural production in the 1980s, and came from behind. In 1985, the area covered by plastic film ranked first in the world. It is currently popularized and applied in 31 provinces, municipalities and autonomous regions across the country. It is used on more than 40 crops such as grain, cotton, oil, vegetables, melons and fruits, tobacco, sugar, medicine, hemp, tea, forests, etc., and generally increases the yield of crops by 30%~ 50%, value-added 40% to 60%, welcomed by the majority of farmers. Plastic film can mainly suppress weeds, increase surface temperature, red...

Examples

specific Embodiment approach 1

[0033] Specific embodiment one: the preparation method of a kind of multifunctional thin film of present embodiment, it is to carry out according to the following steps:

[0034] 1. Preparation of membrane solution:

[0035]①. Under the condition that the stirring speed is 300rpm~600rpm and the temperature is 50°C~90°C, put the polyvinyl alcohol powder into distilled water and stir for 10min~30min to obtain solution A; the quality of the polyvinyl alcohol powder is the same as The volume ratio of distilled water is 1g:(80~85)mL;

[0036] ②. Under the condition that the stirring speed is 300rpm~600rpm and the temperature is 50℃~90℃, add chitosan powder into solution A, and continue stirring for 5min~15min to obtain solution B; The mass ratio of alcohol powder to chitosan powder is 1:(0.5~4);

[0037] ③. Under the condition that the stirring speed is 300rpm~600rpm and the temperature is 50℃~90℃, add glacial acetic acid dropwise to solution B, and continue stirring for 5min~15m...

specific Embodiment approach 2

[0051] Specific embodiment two: what this embodiment is different from specific embodiment one is: the chitosan powder described in step one 2. is specifically prepared according to the following steps:

[0052] a. Extract chitin from fish scales: wash the fish scales repeatedly to remove surface attachments, put them into an electric heating constant temperature blast drying box to obtain dry fish scales; at room temperature and under stirring conditions, immerse 5g of dry fish scales in a concentration of 1mol / L of HCl solution reacted for 30 minutes, poured out the acid solution after the reaction, washed with water until the washing solution was neutral, then immersed in NaOH with a concentration of 1mol / L, and bathed in water at a temperature of 70°C for 7 minutes, poured out the alkali solution after the reaction , washed twice with water, and then adjusted the solution to be neutral with a pH meter, and filtered with suction to obtain crude chitin; KMnO with a concentra...

specific Embodiment approach 3

[0054] Specific embodiment three: the difference between this embodiment and one of specific embodiments one to two is that the mass ratio of polyvinyl alcohol powder and chitosan powder described in step 1. is 1:(1.5~4). Others are the same as the specific embodiment 1 to 2.

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