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Effect of Lignosulphonate on the Properties of Myclobutanil Wettable Powder and the Mechanism

Author: ShangJiBing
Tutor: PangZuoXia
School: South China University of Technology
Course: Chemical Engineering
Keywords: Wettable powder Lignosulfonate Myclobutanil Suspension rate Dispersion
CLC: TQ440
Type: Master's thesis
Year: 2011
Downloads: 47
Quote: 0
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Abstract


WP (WP) is one kind can be dispersed in water to form a stable, available for use to spray pesticide formulations, its low cost, convenient transportation, processing, packaging and no solvent pollution, is widely used. WP also there are certain problems, low concentration, the suspension is low, the low melting point of the original drug (myclobutanil) heat storage performance. With the emergence and application of new formulations (WG, SC), WP future development must be toward the high-quality, high-performance aspects of the development of excellent dispersant can improve the quality and performance of the WP dispersant WP Can critical maintain domestic status of the second pesticide formulations. Firstly, the different types of dispersion agents (lignosulfonate dispersing agent) myclobutanil 40% WP performance, further screening of several WP preferred formulation; Secondly, the study of the molecular weight of the dispersing agent and a sulfo degree on the the WP performance of impact; Finally, pesticide additives myclobutanil WP synergies and dispersion stability mechanism preliminary study. 13 dispersant 40% by measuring the different varieties of the polycarboxylic acid, aliphatic, amino acid-based, lignin sulfonates, etc. myclobutanil azole the WP application performance impact found wood salt dispersant nitrile The bacteria azole WP good wetting properties. WP suspension rate of heat storage before dispersing agent to GCL4-A and Borresperse Na, heat storage, basic suspension rate has decreased, which GCL4-A dispersant decreased less. Were measured GCL4-1, GCL4-A, Borresperse Na, of lignosulphonate four shixian lignin sulfonate (referred to as the structural characteristics of the wood sodium). Four wooden sodium dispersant 40% myclobutanil the WP and test its performance. The results show the better the GCL4-A and GCL4,-performance with GCL4-A of high purity, a high degree of sulfonation of the high degree of sulfonation and GCL4-1, high molecular weight, are closely related. Dispersant GCL4-A do WP heat storage before and after the suspension rate were 84.47% and 81.89%, respectively, the suspension for 2 h the dispersion stability index is the smallest of 2.6 and 4.03, respectively. Myclobutanil WP 40% new formulations were studied. The results showed that the dosage of 1% wetting agent selected K12 WP wetting time is a minimum of 52 s; 5% ash dispersant selected GCL4-A good value for money, the thermal storage before and after the suspension rate of 80.07% and 78.19%. GCL4-A,, and GCL4-1, PC2700, better compounding effect of sodium hexametaphosphate. Based on this screening the four WP formula, comprehensive performance is better than an agrochemical company in Shenzhen actual product. Ultrafiltration by means of the sodium shixian wood, SAF, GCL4-1 classification. The lignosulphonate ultrafiltration experiments shixian, MWCO from small to big, the ultrafiltration fraction molecular weight is successively increased, the weight average molecular weight of from 2360 to 19852; sulfonate content decreases in turn, reduced from 2.66 mmol / g to 0.98 mmol. / g. Stars Preparation WP to three kinds of different molecular weight fraction of the dispersing agent, the performance tests showed that the rate of the suspension before and after the WP heat storage with the dispersant molecular weight increased substantially successively increased, the the wetting time before the heat storage with the molecular weight increases sequentially decreases, 2 h, the dispersion of the suspension stability index and the thickness of the deposited layer increases with the molecular weight of substantially sequentially reduced. Testing a group of similar molecular weight, the influence by the amount of sulfonating agent the modified wood salt GCL3S samples myclobutanil 40% WP performance. The results show that suspended after WP heat storage rate of increase in the amount of sulfonating agent increased first and then decreased, the amount of sulfonating agent for prepared 57.2 g GCL3S-9 corresponds to the WP suspension rate to 81.34%, indicating a moderate sulfonating agent WP better performance corresponding to the amount of the modified product. To examine of the GCL4-1 GCL4-A, Borresperse of Na, stone the Da Nang wood sodium 40% myclobutanil azole WP synergies. Aqueous solution surface tension test GCL4-1's ability to reduce the surface tension of the strongest low of 22.4 mN / m, followed by GCL4-A 32.2 mN / m. Four lignosulphonate reduce WP liquid in contact with the substrate surface angle order: GCL4-A gt; GCL4-1 gt; the Borresperse of Na gt; lignosulphonate shixian. Preparation of WP GCL4-A liquid in banana leaf surface liquid holdup of up to 3.6 mg / cm ~~ 2. Preliminary study of the GCL4-1 the GCL4-A, Borresperse Na shixian lignosulphonate 40% myclobutanil azole WP dispersion stability mechanism. Strongest GCL4-A in myclobutanil surface of the particle adsorption capacity and adsorption amount of a maximum of 7.2 mg / g, the adsorption capacity of the sodium shixian wood weakest, the maximum amount of adsorption of only 3.9 mg / g and the; GCL4 A, GCL4-1 Myclobutanil Zeta potential of particle surface dispersant greater impact and is very similar to 1.5 g / L when the absolute value of the maximum of 31.7 mV and 32.4 mV, much higher than the other two wood sodium. The control application performance shows that the by myclobutanil on large number of adsorption and improve the electrostatic repulsion of the particles, two dispersant has good dispersion properties.

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