阅读说明：本技术 一种抗冲击的剪切增稠液体非织造布复合材料的制备方法 (preparation method of impact-resistant shear thickening liquid non-woven fabric composite material ) 是由 张初阳 齐欢 陈杨轶 张宏杰 于 2019-10-24 设计创作，主要内容包括：本发明公开了一种抗冲击的剪切增稠液体非织造布复合材料的制备方法,其包括：(1)将聚乙二醇200和丙三醇混合,制得混合体系A；(2)加入预设化学计量比的二氧化硅,制得剪切增稠粗流体；(3)将剪切增稠粗流体加入到超声波分散仪中分散处理,制得剪切增稠流体；(4)将剪切增稠流体全部溶解在乙醇中,再超声波振荡处理；同时,将非织造布浸没,再取出晾干；(5)将处理后的非织造布置于恒温干燥箱中处理,制得剪切增稠液体非织造布复合材料,本发明将非织造布与剪切增稠液体集合起来即满足了舒适,透气,柔软性,又满足了抗冲击的强度要求,使其可广泛用于防护材料；其成品在护具、防护服、功能性材料、抗冲击性材料等应用前景十分广泛。(the invention discloses a preparation method of an impact-resistant shear thickening liquid non-woven fabric composite material, which comprises the following steps: (1) mixing polyethylene glycol 200 and glycerol to obtain a mixed system A; (2) adding silicon dioxide with a preset stoichiometric ratio to prepare a shear thickening crude fluid; (3) adding the shear thickening crude fluid into an ultrasonic wave dispersing instrument for dispersing treatment to prepare shear thickening fluid; (4) dissolving the shear thickening fluid in ethanol completely, and then carrying out ultrasonic oscillation treatment; meanwhile, immersing the non-woven fabric, taking out and airing; (5) the non-woven fabric and the shear thickening liquid are integrated together, so that the requirements of comfort, ventilation and flexibility are met, and the impact strength is met, so that the non-woven fabric composite material can be widely used as a protective material; the finished product has wide application prospect in protective clothing, functional materials, impact-resistant materials and the like.)

1. a preparation method of an impact-resistant shear thickening liquid non-woven fabric composite material is characterized by comprising the following steps: it includes:

(1) Mixing polyethylene glycol 200 and glycerol according to a volume ratio of 9: 1, and then uniformly stirring to prepare a mixed system A;

(2) Gradually adding silicon dioxide with a preset stoichiometric ratio into the mixed system A, stirring the mixed system at a constant power, detecting the stirring speed, stopping adding the silicon dioxide and keeping the adding when the stirring speed is reduced to a preset value A, and continuously adding the silicon dioxide when the stirring speed is increased to a preset value B until the silicon dioxide is completely added into the mixed system A to prepare a shear thickening crude fluid;

(3) Adding the shear thickening coarse fluid into an ultrasonic dispersion instrument for dispersion treatment, uniformly dispersing silica particles in a mixing system A, and removing bubbles in the shear thickening coarse fluid to prepare the shear thickening fluid;

(4) Adding ethanol into the shear thickening fluid according to the volume ratio of 1: 1, and carrying out ultrasonic oscillation treatment after the shear thickening fluid is completely dissolved in the ethanol; meanwhile, completely immersing the untreated non-woven fabric in the solution, taking out the non-woven fabric after the immersion treatment, hanging the non-woven fabric, and removing the redundant liquid which is not attached;

(5) And (3) arranging the non-woven fabric subjected to the suspension treatment in a constant-temperature drying box, drying, and volatilizing ethanol to obtain the shear thickening liquid non-woven fabric composite material.

2. The method of making an impact resistant shear thickening fluid nonwoven composite of claim 1, wherein: and (3) stirring treatment in the step (1) and the step (2) adopts a dissolving type stirring rod paddle.

3. the method of making an impact resistant shear thickening fluid nonwoven composite of claim 1, wherein: in the step (2), the initial rotation speed of stirring is 1200 rpm, the preset value A is 1150 rpm, and the preset value B is 1160 rpm.

4. The method of making an impact resistant shear thickening fluid nonwoven composite of claim 1, wherein: in the step (2), the particle size of the silicon dioxide is 12 nm, and the mass fraction of the silicon dioxide in the shear thickening crude fluid is 30%.

5. The method of making an impact resistant shear thickening fluid nonwoven composite of claim 1, wherein: and (3) adding the shear thickening crude fluid into an ultrasonic disperser for dispersing for 6 h.

6. the method of making an impact resistant shear thickening fluid nonwoven composite of claim 1, wherein: in the step (4), the time of ultrasonic oscillation treatment is 10 min.

7. The method of making an impact resistant shear thickening fluid nonwoven composite of claim 1, wherein: in the step (4), the time of the non-woven fabric immersion treatment is 10 min.

8. The method of making an impact resistant shear thickening fluid nonwoven composite of claim 1, wherein: in the step (5), the drying temperature of the constant-temperature drying oven is 80 ℃, and the drying treatment time is 8 hours.

9. an impact resistant shear thickening fluid nonwoven composite characterized by: which is obtained by the preparation process according to one of claims 1 to 8.

Technical Field

the invention relates to the technical field of shear thickening fluids and application thereof, in particular to a preparation method of an impact-resistant shear thickening liquid non-woven fabric composite material.

background

Shear thickening fluids are normally slightly viscous liquids which, when impacted, rapidly increase in viscosity at critical shear rates or strains to form a solid-like mass which returns to a viscous state when the force is removed. Most of the shear thickening fluids are prepared by dispersing silicon dioxide nanoparticles in polyethylene glycol, wherein the diameter of the silicon dioxide nanoparticles is 7-700 nm. The smaller the diameter of the silica particles, the greater the dispersion difficulty, which has a negative effect on the effect of increasing shear thickening.

There are two main types of SiO2 dispersions that have been investigated so far. One is that SiO2 is modified by organic matter such as cyclohexane and 3- (trimethoxy silane) propyl acrylate and then is dispersed in organic systems such as octadecanol, tetrahydrofurfuryl alcohol and the like; the other method is to select hydrophilic or hydrophobic SiO2 to be directly dispersed in polar medium (such as water, mixed solution of water and acetone, polyethylene glycol) or non-polar medium (such as inorganic silicone oil, mineral oil).

there are two current views of the shear thickening mechanism: one is the mechanism proposed by Hoffman for the transition of particles from "ordered" to "disordered", shear thickening is due to the fact that as the shear rate increases, the fluid force acting on the particles also increases, when the critical point is reached, the fluid force becomes the main force, the ordered structure of the particles in the system is destroyed and becomes disordered, and the viscosity of the system increases; the other is the "particle cluster" generation mechanism proposed by Brady et al through stokes dynamic simulation: a stable space structure is formed between silicon dioxide and polyethylene glycol in the shear thickening liquid through hydrogen bonds, partial hydrogen bonds are broken under a low shear rate, the space structure is damaged, the solid-liquid acting force is weakened, and the system contains silicon dioxide which is not connected with the polyethylene glycol, so that the viscosity is reduced. As the shear rate further increases, the number of hydrogen bond breaks increases and the silica present alone in the liquid becomes more abundant, where a large amount of silica forms "clusters" under the force of the fluid, creating a barrier to the fluid, resulting in an increase in viscosity.

nonwoven materials are widely used in industrial production and daily life due to their characteristics of high porosity, good flexibility, high yield, and the like.

Therefore, if the non-woven material can be compounded with the shear thickening fluid material, the application prospect of the non-woven material is greatly improved.

disclosure of Invention

Aiming at the situation of the prior art, the invention aims to provide a preparation method of an impact-resistant shear thickening liquid non-woven fabric composite material which has strong impact resistance and can be widely applied.

In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:

A method of making an impact resistant shear thickening fluid nonwoven composite comprising:

(1) Mixing polyethylene glycol 200 and glycerol according to a volume ratio of 9: 1, and then uniformly stirring to prepare a mixed system A;

(2) Gradually adding silicon dioxide with a preset stoichiometric ratio into the mixed system A, stirring the mixed system at a constant power, detecting the stirring speed, stopping adding the silicon dioxide and keeping the adding when the stirring speed is reduced to a preset value A, and continuously adding the silicon dioxide when the stirring speed is increased to a preset value B until the silicon dioxide is completely added into the mixed system A to prepare a shear thickening crude fluid;

(3) Adding the shear thickening coarse fluid into an ultrasonic dispersion instrument for dispersion treatment, uniformly dispersing silica particles in a mixing system A, and removing bubbles in the shear thickening coarse fluid to prepare the shear thickening fluid;

(4) Adding ethanol into the shear thickening fluid according to the volume ratio of 1: 1, and carrying out ultrasonic oscillation treatment after the shear thickening fluid is completely dissolved in the ethanol; meanwhile, completely immersing the untreated non-woven fabric in the solution, taking out the non-woven fabric after the immersion treatment, hanging the non-woven fabric, and removing the redundant liquid which is not attached;

(5) And (3) arranging the non-woven fabric subjected to the suspension treatment in a constant-temperature drying box, drying, and volatilizing ethanol to obtain the shear thickening liquid non-woven fabric composite material.

further, the stirring treatment in step (1) and step (2) is carried out by using a paddle of a dissolving stirring rod.

Further, in the step (2), the initial rotation speed of stirring is 1200 rpm, the preset value A is 1150 rpm, and the preset value B is 1160 rpm.

Further, in the step (2), the particle size of the silica is 12 nm, and the mass fraction of the silica in the shear thickening crude fluid is 30%.

Further, in the step (3), the shear thickening crude fluid is added into an ultrasonic disperser for dispersing treatment for 6 h.

Further, in the step (4), the time of the ultrasonic oscillation treatment was 10 min.

Further, in the step (4), the time for the immersion treatment of the nonwoven fabric is 10 min.

Further, in the step (5), the drying temperature of the constant-temperature drying oven is 80 ℃, and the drying treatment time is 8 hours.

An impact-resistant shear thickening fluid non-woven fabric composite material prepared by the preparation method.

by adopting the technical scheme, compared with the prior art, the invention has the beneficial effects that: the invention combines the non-woven fabric and the shear thickening liquid, thereby meeting the requirements of comfort, ventilation and flexibility, meeting the requirement of impact strength and having mechanical properties which can be widely used for protective materials; the finished product can be used for protective clothing, functional materials, impact-resistant materials and the like, and has wide application prospect.

Detailed Description

A method of making an impact resistant shear thickening fluid nonwoven composite comprising:

(1) mixing polyethylene glycol 200 and glycerol according to a volume ratio of 9: 1, and then uniformly stirring by using a paddle of a dissolving stirring rod to prepare a mixed system A;

(2) Gradually adding silicon dioxide with the particle size of 12 nm in a preset stoichiometric ratio into the mixed system A, stirring the mixed system at a constant power, detecting the stirring speed, stopping adding the silicon dioxide and keeping the stirring speed when the stirring speed is reduced to a preset value A, and continuing adding the silicon dioxide when the stirring speed is increased to a preset value B until the mass fraction of the silicon dioxide added into the mixed system A reaches 30% to prepare a shear thickening crude fluid; wherein the initial rotation speed of stirring is 1200 rpm, the preset value A is 1150 rpm, and the preset value B is 1160 rpm;

(3) Adding the shear thickening coarse fluid into an ultrasonic dispersion instrument for dispersion treatment for 6 h, uniformly dispersing silica particles in a mixing system A, and removing bubbles in the shear thickening coarse fluid to obtain the shear thickening fluid;

(4) Adding ethanol into the shear thickening fluid according to the volume ratio of 1: 1, and carrying out ultrasonic oscillation treatment for 10 min after the shear thickening fluid is completely dissolved in the ethanol; meanwhile, completely immersing the untreated non-woven fabric in the solution, taking out the non-woven fabric after the immersion treatment for 10 min, and suspending the non-woven fabric to remove the redundant liquid which is not attached;

(5) And (3) arranging the non-woven fabric subjected to the suspension treatment in a constant-temperature drying box, drying for 8 hours at the temperature of 80 ℃, and volatilizing ethanol to obtain the shear thickening liquid non-woven fabric composite material.

In the case where the mixing vessel of the mixing system is a 500ml beaker, the diameter of the paddle of the dissolving stirrer is approximately 5 cm.