CN109867493A

CN109867493A - Vinal dispersion technology and its application

Info

Publication number: CN109867493A
Application number: CN201910287707.8A
Authority: CN
Inventors: 赵春花; 祝小龙; 王子健; 卓静; 潘颖; 刘先锋; 王思长; 董秀坤; 李晓蕾; 袁龄卿; 周博
Original assignee: Chongqing University of Science and Technology
Current assignee: Chongqing University of Science and Technology
Priority date: 2019-04-11
Filing date: 2019-04-11
Publication date: 2019-06-11

Abstract

The invention discloses a polyvinyl alcohol fiber dispersion technology, which comprises the following steps: (1) placing the polyvinyl alcohol fibers in a container and stirring to transform the polyvinyl alcohol fibers from bundle fibers into bulky fibers; (2) In step (1), add a powder with a particle size of micron, and then place the mixture in a ball mill and stir until the bulky fibers are dispersed into monofilaments, and the polyvinyl alcohol fibers are dispersed, and monofilament polyethylene is finally obtained. Alcohol fiber. The invention also discloses the application of the aforementioned technology in preparing concrete materials. The invention can well disperse the polyvinyl alcohol fibers, and the added powder will not affect the mechanical properties of the concrete material, but instead improves the dispersion uniformity of the polyvinyl alcohol fibers in the concrete, and better improves the reinforcement and increase of the concrete. Resilience. The invention has simple technology, short process, easy control, low cost and easy industrial production.

Description

Vinal dispersion technology and its application

Technical field

The present invention relates to field of material technology, and in particular to a kind of vinal dispersion technology and its application.

Background technique

Vinal (abbreviation PVA fiber) is a kind of function admirable and widely used synthetic fibers, is had very high Tensile strength and elasticity modulus, good alkali resistance, weatherability, wearability, corrosion resistance, radiation resistance and cement matrix Caking property, meet many good characteristics of new material, and have excellent environmental-protecting performance, be widely used in non-woven cloth, Bast fibre spinning, cotton spinning, military project, papermaking, wool spinning, cement reinforcement etc..

Vinal finished product is the long fiber cut, mutually wrapped up in again in packaging, storage and transportational process it is attached easily It is bonded together, forms cluster cluster fibre bundle.When the vinal of tufted directly participates in concrete mixing, it is adhered to one another Together.In concrete preparation process, since vinal has excellent hydrophilic, under the action of capillary tension, Fiber meets water and forms fibre bundle group, is more difficult to disperse.When mixing and stirring it is difficult to ensure that fiber, which is dispersed in matrix, forms net Lattice system, and the fiber of conglomeration can form stress concentration point one by one in concrete, become the weakness of corrosive medium intrusion Point and breach, are not only difficult to improve the enhancing performance of resisting cracking of concrete, can also seriously destroy the stability of concrete structure, greatly The big service life for reducing concrete.A large number of experiments research shows that fiber in concrete material whether it is evenly dispersed be influence The key factor of its toughening performance of resisting cracking, vinal cannot disperse well, will directly influence vinal Application in concrete material.

Summary of the invention

The purpose of the present invention is the dispersibilities present in for above-mentioned vinal in concrete material Bad problem provides a kind of vinal dispersion technology and its application.

In order to achieve the object of the present invention, the present invention provides a kind of vinal dispersion technology, include the following steps:

(1) vinal is placed in container and is stirred, vinal is made to be transformed into bulk shape by bundle fiber Fiber；

(2) be micron-sized powder to partial size is added in step (1), then by mixture be placed in ball mill stirring until The fiber of bulk shape is dispersed into monofilament, and vinal is dispersed, and finally obtains monofilament shaped polyethylene alcohol fiber.

In the above-mentioned technical solutions, the stirring in the step (1) refers to 120~180s of stirring at 5~50 DEG C.

Partial size described in the step (2) is graphene, flyash of the micron-sized finger partial size at 5~50 microns.

In the above-mentioned technical solutions, the additive amount of graphene powder is the 10%~20% of vinal quality；Powder Coal ash additive amount is the 300%~500% of vinal quality.

Mixing time is 120~180s in the ball mill in the step (2).

The present invention also provides above-mentioned technologies to prepare the application in concrete material.

Concrete application method includes the following steps: that (1) determines cement according to concrete mix, water, sand, gathers materials and monofilament The dosage of shaped polyethylene alcohol fiber mixes aforementioned resulting monofilament shaped polyethylene alcohol fiber with cement according to match ratio, It is stirred at 10~40 DEG C, is dispersed in fiber in cement, form Cement fibre mixture；It (2) will at 10~40 DEG C Sand and the stirring in concrete mixer of gathering materials form sandstone mixture；(3) at 10~40 DEG C by Cement fibre mixture by Amount is added in concrete mixer and is stirred to form fiber concrete siccative with sandstone mixture；(4) next at 10~40 DEG C Fiber concrete siccative is stirred on side, and water is added by amount on one side, and stirring is dispersed in fiber in concrete, forms fiber coagulation Fibre concrete mixture can be used to construct by native mixture according to construction requirement.

Physical Mechanism of the invention is as follows:

The surface of solids has the ability of absorption other materials.The molecule or atom of the surface of solids have the remaining field of force, when When other molecule approach surfaces of solids, by the attraction of surface of solids molecule or atom, it is pulled to surface, in surface of solids richness Collection.The active force of this absorption is Van der Waals force (Vanderwaals force), and absorption is only limited to the surface of solids or solid hole Inner surface.Due to total large specific surface area of micron order graphene or flyash or miberal powder or cement, surface can be also big, from And its adsorption capacity is big, can be adsorbed on fiber surface, destroys the attraction between fiber filament, has the function that disperse fiber.

The beneficial effects of the present invention are: can well disperse vinal, the powder of addition will not influence mixed Every mechanical property of solidifying soil material, improves dispersing uniformity of the vinal in concrete instead, preferably mentions The activeness and quietness performance of high concrete.The technology of the present invention is simple, process is short, easy to control, at low cost, easy to industrialized production.

Detailed description of the invention

Fig. 1 is the reset condition figure of pencil vinal.

Fig. 2 is that bundle fiber becomes the state diagram after puffy.

Fig. 3 is the monofilament state diagram using vinal after graphene dispersion.

Fig. 4 is dispersity schematic diagram of the graphene powder dispersion polyethylene alcohol fiber in concrete material.

Fig. 5 is the monofilament state diagram using vinal after flyash dispersion.

Fig. 6 is dispersity schematic diagram of the flyash dispersion polyethylene alcohol fiber in concrete material.

Specific embodiment

Below with reference to embodiment, the invention will be further described, but not thereby limiting the invention.

Experimental method in following embodiments is unless otherwise instructed conventional method.

Embodiment 1

One, using graphene powder dispersion polyethylene alcohol fiber, the specific steps are as follows:

(1) 1g vinal (its Product Status originally is as shown in Figure 1, be pencil) is placed in glass container, 5 120s is stirred at DEG C, bundle fiber becomes puffy (as shown in Figure 2).

(2) graphene powder that 0.1g partial size is 5~50 microns is added into the vinal of step (1), then Mixture is placed in ball mill together, stirs 120s, puffy fiber is dispersed into monofilament shape (as shown in Figure 3), polyethylene Alcohol fiber is dispersed, and monofilament shaped polyethylene alcohol fiber is finally obtained.

Two, by monofilament shaped polyethylene alcohol fiber applications obtained above to preparing in concrete material, in accordance with the following steps Operation:

(1) cement, water, sand, the dosage gathered materials with monofilament shaped polyethylene alcohol fiber are determined according to concrete mix, by institute The monofilament shaped polyethylene alcohol fiber obtained is mixed in individual malaxation device with cement according to match ratio, is stirred at 10 DEG C 300s or more is dispersed in fiber in cement, forms Cement fibre mixture；

(2) sand and the stirring 300s or more in concrete mixer that gathers materials are formed into sandstone mixture at 10 DEG C；

(3) Cement fibre mixture is added in concrete mixer at 10 DEG C by amount and is stirred with sandstone mixture It mixes, sandstone mixture should be stirred in adition process on one side, Cement fibre mixture is added by amount on one side, makes Cement fibre mixture It is sufficiently mixed in sandstone, mixing time forms fiber concrete siccative in 300s or more；

(4) it stirs fiber concrete siccative on one side at 10 DEG C, water is added by amount on one side, stir 300s or more, make fiber It is dispersed in concrete, forms fibre concrete mixture, fibre concrete mixture can be used according to construction requirement In construction.

The vinal for the monofilament shape that the present embodiment obtains can be well dispersed in concrete, as shown in Figure 4.

Embodiment 2

Using graphene powder dispersion polyethylene alcohol fiber, the specific steps are as follows:

(1) 1g vinal is placed in glass container, 150s is stirred at 35 DEG C, bundle fiber becomes puffy fibre Dimension.

(2) graphene powder that 0.2g partial size is 5~50 microns is added into the vinal of step (1), then Mixture is placed in ball mill together, stirs 120s, puffy fiber is dispersed into monofilament shape, and vinal obtains Dispersion, finally obtains monofilament shaped polyethylene alcohol fiber.

According to the method for embodiment 1 by monofilament shaped polyethylene alcohol fiber applications to preparing in concrete material, as the result is shown The vinal for the monofilament shape that the present embodiment obtains can be well dispersed in concrete.

Embodiment 3

(1) 1g vinal is placed in glass container, 180s is stirred at 50 DEG C, bundle fiber becomes puffy.

Embodiment 4

One, using flyash powder dispersion polyethylene alcohol fiber, the specific steps are as follows:

(1) 1g vinal is placed in glass container, 120s is stirred at 5 DEG C, bundle fiber is in puffy.

(2) I grade of flyash of 5g (partial size < 45um accounts for 80% or more) is added into the vinal of step (1), then Mixture is placed in ball mill together, stirs 120s, puffy fiber is dispersed into monofilament shape (as shown in Figure 5), polyvinyl alcohol Fiber is dispersed, and monofilament shaped polyethylene alcohol fiber is finally obtained.

(1) cement, water, sand, the dosage gathered materials with monofilament shaped polyethylene alcohol fiber are determined according to concrete mix, by institute The monofilament shaped polyethylene alcohol fiber obtained is mixed in individual malaxation device with cement according to match ratio, is stirred at 40 DEG C 300s or more is dispersed in fiber in cement, forms Cement fibre mixture；

(2) sand and the stirring 300s or more in concrete mixer that gathers materials are formed into sandstone mixture at 40 DEG C；

(3) Cement fibre mixture is added in concrete mixer at 40 DEG C by amount and is stirred with sandstone mixture It mixes, sandstone mixture should be stirred in adition process on one side, Cement fibre mixture is added by amount on one side, makes Cement fibre mixture It is sufficiently mixed in sandstone, mixing time forms fiber concrete siccative in 300s or more；

(4) it stirs fiber concrete siccative on one side at 40 DEG C, water is added by amount on one side, stir 300s or more, make fiber It is dispersed in concrete, forms fibre concrete mixture, fibre concrete mixture can be used according to construction requirement In construction.

The vinal for the monofilament shape that the present embodiment obtains can be well dispersed in concrete, as shown in Figure 6.

Embodiment 5

Using flyash powder dispersion polyethylene alcohol fiber, the specific steps are as follows:

(1) 1g vinal is placed in glass container, 180s is stirred at 25 DEG C, bundle fiber is in puffy.

(2) I grade of flyash of 3g (partial size < 45um accounts for 80% or more) is added into the vinal of step (1), then Mixture is placed in ball mill together, stirs 120s, puffy fiber is dispersed into monofilament shape, and vinal is divided It dissipates, finally obtains monofilament shaped polyethylene alcohol fiber.

According to the method for embodiment 4 by monofilament shaped polyethylene alcohol fiber applications to preparing in concrete material, as the result is shown The vinal for the monofilament shape that the present embodiment obtains can be well dispersed in concrete.

Embodiment 6

(1) 1g vinal is placed in glass container, 140s is stirred at 30 DEG C, bundle fiber is in puffy.

(2) I grade of flyash of 4g (partial size < 45um accounts for 80% or more) is added into the vinal of step (1), then Mixture is placed in ball mill together, stirs 180s, puffy fiber is dispersed into monofilament shape, and vinal is divided It dissipates, finally obtains monofilament shaped polyethylene alcohol fiber.

Claims

1. a polyvinyl alcohol fiber dispersion technology, is characterized in that, comprises the steps:

(1) The polyvinyl alcohol fiber is placed in a container and stirred, so that the polyvinyl alcohol fiber is transformed into a bulky fiber from a bundle fiber;

(2) adding powder with a particle size of micron in step (1), then placing the mixture in a ball mill and stirring until the bulky fibers are dispersed into monofilaments, the polyvinyl alcohol fibers are dispersed, and finally monofilaments are obtained shaped polyvinyl alcohol fibers.

2 . The polyvinyl alcohol fiber dispersion technology according to claim 1 , wherein the stirring in the step (1) refers to stirring at 5-50° C. for 120-180 s. 3 .

3 . The polyvinyl alcohol fiber dispersion technology according to claim 1 , wherein the particle size in the step (2) is micron-level and refers to graphene and fly ash with a particle size of 5-50 microns. 4 .

4. The polyvinyl alcohol fiber dispersion technology according to claim 3, characterized in that, the addition amount of graphene powder is 10%～20% of the polyvinyl alcohol fiber quality; the fly ash addition amount is the polyvinyl alcohol fiber quality 300% to 500%.

5. The polyvinyl alcohol fiber dispersion technology according to claim 1 or 3, characterized in that, in step (2), the stirring time in the ball mill is 120-180 s.

6. The application of the technology of any one of claims 1 to 5 in the preparation of concrete materials.

7. application as claimed in claim 6, is characterized in that, concrete application method comprises the steps: (1) determine the consumption of cement, water, sand, aggregate and monofilament polyvinyl alcohol fiber according to concrete mixing ratio, It is required that the monofilament polyvinyl alcohol fiber obtained in any one of 1 to 5 is mixed with cement according to the mixing ratio, and stirred at 10 to 40 ° C, so that the fibers are uniformly dispersed in the cement to form a cement fiber mixture; (2) at 10 The sand and aggregate are stirred in a concrete mixer to form a sand-gravel mixture at a temperature of ~40°C; (3) the cement fiber mixture is gradually added to the concrete mixer at a temperature of 10-40°C and mixed with the sand-gravel mixture to form a dry fiber concrete. (4) While stirring the dry fiber reinforced concrete material at 10-40 °C, add water gradually, and stir to make the fibers evenly dispersed in the concrete to form a fiber reinforced concrete mixture, and the fiber reinforced concrete mixture can be used according to the construction requirements. in construction.