阅读说明：本技术 一种除草剂防护剂的制备方法及其应用 (Preparation method and application of herbicide protectant ) 是由 吴正岩 高玉洁 蔡冬清 张桂龙 于 2019-09-25 设计创作，主要内容包括：本发明公开一种除草剂防护剂的制备方法,涉及植物保护领域,基于现有的纳米二氧化钛与生物炭制备的复合材料的疏水性差的问题而提出的。本发明包括以下步骤：(1)将生物炭与纳米二氧化钛混合均匀并加入到石油醚中并搅拌,配置浓度为20-100g/L的悬浮液；(2)往悬浮液中加入甲基含氢硅油,搅拌,干燥,研磨成粉末,得到除草剂防护剂。本发明还提供有上述方法制得防护剂的应用。本发明的有益效果在于：采用甲基含氢硅油对生物炭和纳米二氧化钛进行修饰,得到疏水纳米复合材料,该材料赋予了植物叶片疏水的性能,降低了除草剂在植物叶面的附着能力,从而降低除草剂对作物的危害。(The invention discloses a preparation method of a herbicide protectant, relates to the field of plant protection, and is provided based on the problem of poor hydrophobicity of a composite material prepared from existing nano titanium dioxide and biochar. The invention comprises the following steps: (1) uniformly mixing biochar and nano titanium dioxide, adding the biochar and the nano titanium dioxide into petroleum ether, and stirring to prepare a suspension with the concentration of 20-100 g/L; (2) and adding methyl hydrogen silicone oil into the suspension, stirring, drying and grinding into powder to obtain the herbicide protectant. The invention also provides application of the protective agent prepared by the method. The invention has the beneficial effects that: the methyl hydrogen-containing silicone oil is adopted to modify the biochar and the nano titanium dioxide to obtain the hydrophobic nano composite material, the hydrophobic property of the plant leaves is endowed with the material, and the adhesion capability of the herbicide on the plant leaves is reduced, so that the harm of the herbicide to crops is reduced.)

1. A preparation method of a herbicide protectant is characterized in that: the method comprises the following steps:

(1) respectively sieving the biochar and the nano titanium dioxide for later use;

(2) preparation of herbicide safener: mixing biochar and nano titanium dioxide according to the mass ratio of 1-3:3-8, uniformly stirring, adding 40-80mL of petroleum ether, and preparing into suspension with the concentration of 20-100 g/L;

(3) and (3) adding methyl hydrogen silicone oil into the suspension obtained in the step (2) to enable the concentration of the methyl hydrogen silicone oil in the suspension to be 50-200mL/L, drying the suspension at 40-80 ℃ for 2-8h, and grinding the suspension to 100-mesh-300-mesh to obtain hydrophobic organism/titanium oxide mixed powder, namely the herbicide protectant.

2. A process for the preparation of a herbicide safener as claimed in claim 1 wherein: the biochar is sieved by a sieve with 100 meshes and 300 meshes.

3. A process for the preparation of a herbicide safener as claimed in claim 1 wherein: the nano titanium dioxide is sieved by a sieve with 100 meshes and 200 meshes.

4. A process for the preparation of a herbicide safener as claimed in claim 1 wherein: the homogenizing and stirring time in the step (2) is 10-50min, and the rotating speed is 300-500 rpm.

5. A process for the preparation of a herbicide safener as claimed in claim 1 wherein: the stirring time in the step (3) is 50-150min, and the rotation speed is 300-500 rpm.

6. A process for the preparation of a herbicide safener as claimed in claim 1 wherein: the method also comprises the following detection steps: hydrophobicity testing of herbicide safeners: weighing 1-2g herbicide protectant, uniformly dispersing the herbicide protectant on a cover glass, and measuring the contact angle.

7. The use of the safener according to any of claims 1 to 6, which is prepared by the process for the preparation of a herbicide safener, comprising the steps of: the prepared herbicide protectant is weighed up,the surface area of the herbicide protective agent and the crop leaf is 1-5mg/cm²The amount of the herbicide is uniformly sprayed on the surface of the leaf of the crop, and the herbicide is sprayed, and after 15 days, the growth condition of the crop is observed.

8. The use of the herbicide safener according to claim 7 in a safener prepared by the process of preparing a herbicide safener comprising: the method also comprises the following detection steps: uniformly spraying 1-2mg of herbicide protectant on the surface of the crop leaf, spraying 1-2mL of herbicide, and detecting the attachment rate of the herbicide on the surface of the crop leaf after 10-15 min.

9. The use of the herbicide safener according to claim 7 in a safener prepared by the process of preparing a herbicide safener comprising: the herbicide is glyphosate.

10. The use of a herbicide safener as claimed in claim 9 in the manufacture of a safener comprising: the concentration of the glyphosate aqueous solution is 1-2 g/L.

Technical Field

The invention relates to the field of plant protection, in particular to a preparation method and application of a herbicide protectant.

Background

The herbicide plays an important role in agricultural production, the invention and the use of the herbicide greatly reduce the labor cost and improve the agricultural production efficiency. However, most of the herbicides can cause different degrees of damage to crops during the use process of the herbicides, and serious economic losses are caused. The existing herbicide protection technologies mainly comprise a biological method (transgenic crops), an agricultural machine method (anti-drift spraying) and a plant protective agent method (plant essential oil and the like). Although these techniques reduce the damage of herbicides to crops to some extent, they have disadvantages. Wherein the spread of transgenic crops is limited in many countries; agricultural machines can not protect plants accurately, and are greatly influenced by the outside.

The patent 'a modified nano TiO 2/Ag/bamboo charcoal composite material and a method for killing microbes in medical sewage by using the same' discloses a preparation method of a modified nano TiO 2/Ag/bamboo charcoal composite material (patent number: CN 103447027). the composite material is added into wastewater to kill microbes in the medical sewage efficiently under sunlight. In the literature, "preparation and performance research of titanium dioxide/biomass activated carbon composite material" (D. symposium of fertilizer industry, 2013.), activated carbon is used as a carrier for supporting a titanium dioxide photocatalyst, and a sol-gel method is used to prepare the photocatalytic composite material. The composite material prepared by the method has the problem of poor hydrophobicity.

Disclosure of Invention

The invention aims to provide a preparation method of a herbicide protective agent, which can reduce the adhesion capability of a herbicide on the leaf surfaces of crops, thereby reducing the harm of the herbicide to the crops.

The invention adopts the following technical scheme to solve the technical problems:

the invention provides a preparation method of a herbicide protectant, which is characterized by comprising the following steps: the method comprises the following steps:

a preparation method of a herbicide protectant comprises the following steps:

(1) respectively sieving the biochar and the nano titanium dioxide for later use;

(2) preparation of herbicide safener: mixing biochar and nano titanium dioxide according to the mass ratio of 1-3:3-8, uniformly stirring, adding 40-80mL of petroleum ether, and preparing into suspension with the concentration of 20-100 g/L;

(3) adding methyl hydrogen silicone oil with concentration into the suspension obtained in the step (2) to enable the concentration of the methyl hydrogen silicone oil in the suspension to be 50-200mL/L, drying the suspension at 40-80 ℃ for 2-8h, and grinding the suspension to 100-300 meshes to obtain the hydrophobic organism/titanium oxide mixed powder, namely the herbicide protectant.

According to the invention, methyl hydrogen-containing silicone oil is adopted to modify the biochar and the nano titanium dioxide to obtain the hydrophobic nano composite material, the hydrophobic property of the plant leaves is endowed by the material, and the adhesion capability of the herbicide on the plant leaf surfaces is reduced, so that the harm of the herbicide to crops is reduced.

Preferably, the biochar is sieved by a sieve with 100-300 meshes; the biochar is used as a soil conditioner and has important influence on the attachment amount of the herbicide on the leaf surfaces of crops.

Preferably, the nano titanium dioxide is sieved by a sieve with 100-200 meshes; the nanometer titanium dioxide has good dispersibility and weather resistance, has the performances of resisting lines, bacteria and ageing, and can effectively promote the photosynthesis of crops.

Preferably, the homogenizing and stirring time in the step (2) is 10-50min, and the rotation speed is 300-500 rpm.

Preferably, the stirring time in the step (3) is 50-150min, and the rotation speed is 300-500 rpm.

Preferably, the method further comprises the step of: hydrophobicity testing of herbicide safeners: weighing 1-2g of herbicide protectant, uniformly dispersing the herbicide protectant on a cover glass, and measuring the contact angle of the herbicide protectant; the measurement of the contact angle reflects the hydrophobic properties of the herbicide safener, which reduces the rate of adherence of the herbicide to the crop leaves.

The application of the protective agent prepared by the preparation method of the herbicide protective agent comprises the following steps: weighing the prepared herbicide protectant, and mixing the herbicide protectant withThe surface area of the crop leaves is 1-5mg/cm²Uniformly spraying the mixture on the surface of a crop leaf, spraying a herbicide, and observing the growth condition of the crop after 15 days; the growth condition of the crops can intuitively reflect the effect that the herbicide protective agent can reduce the harm of the herbicide to the crops to a certain extent.

Further, the method also comprises the following detection steps: uniformly spraying 1-2mg of herbicide protectant on the surface of a crop leaf, spraying 1-2mL of herbicide, and detecting the attachment rate of the herbicide on the surface of the crop leaf after 10-15 min; the protection effect of the herbicide protective agent on crops can be reflected by detecting the attachment rate of the herbicide on the surfaces of the leaves of the crops;

the formula for calculating the attachment rate of the herbicide on the surface of the crop leaves is as follows:

the attachment rate (the amount of herbicide attached to the surface of the foliage after spraying the herbicide protectant)/the amount of herbicide sprayed x 100%.

Further, the herbicide is glyphosate.

Further, the concentration of the glyphosate aqueous solution is 1-2 g/L; the amount of herbicide sprayed has a significant effect on the growth conditions of the crop.

The invention has the beneficial effects that:

(1) according to the invention, methyl hydrogen-containing silicone oil is adopted to modify the biochar and the nano titanium dioxide to obtain the hydrophobic nano composite material, the hydrophobic property of the plant leaves is endowed by the material, and the adhesion capability of the herbicide on the plant leaf surfaces is reduced, so that the harm of the herbicide to crops is reduced.

(2) The biochar, the nano titanium dioxide and the methyl hydrogen-containing silicone oil adopted by the invention are used as materials for preparing the protective agent, and the materials have stable performance and are environment-friendly.

Drawings

FIG. 1 is a graph showing the results of the rates of adhesion of the herbicides of examples 1 to 3 of the present invention and comparative examples 1 to 2 on leaf surfaces;

FIG. 2 is a graph showing the results of the growth of the crop in example 1 of the present invention;

FIG. 3 is a graph showing the results of the growth of the crop in example 2 of the present invention;

FIG. 4 is a graph showing the results of the growth of the crop in example 3 of the present invention;

FIG. 5 is a graph showing the results of the growth conditions of the crops in comparative example 1 of the present invention;

FIG. 6 is a graph showing the results of the growth conditions of the crop of comparative example 2 of the present invention.

Detailed Description

The invention will be described in further detail below with reference to the drawings and examples of the specification.

Test materials, reagents and the like used in the following examples are commercially available unless otherwise specified.