CN104829869A - High-strength polypropylene composite material for weaving and preparation method thereof - Google Patents

Abstract

The invention relates to the field of high-strength woven bag materials, particularly a montmorillonite/polypropylene composite material and a preparation method thereof. The method comprises the step of chemical modification of montmorillonite by modifying organic matters onto the montmorillonite surface, so that the montmorillonite lamella interval is increased; and thus, the montmorillonite can be dispersed in the polyethylene base more uniformly and can contact the base more sufficiently, thereby enhancing the mechanical properties.

Description

A kind of high strength braiding polypropylene composite material and preparation method thereof

Technical field

The invention belongs to woven bag Material Field, relate to a kind of polynite/polypropylene composite material and preparation method thereof.

Background technology

Polywoven Bag mainly add in the resins such as polypropylene (PP) a small amount of auxiliary material mixing after through forcing machine melting, extruded plastic foil cuts into silk, stretching lower than under resin melt temperature, high strength is made by molecular orientation and heat setting type, the flat filament of low elongation, then through reeling, weaving cotton cloth, cutting, stitching make Polywoven Bag.But PP is as general-purpose plastics, there is low temperature brittleness, poor toughness, the easily shortcoming such as aging, performance is gone back imperfection, needs to carry out modification and just can be applied better.

Polynite (MMT), as very typical lamella nano material, in the research studied with many polymer-based composites, mainly concentrates on the performances such as the mechanics of matrix material, calorifics.In view of the nano effect of MMT itself, its dispersion in polymer-based composite is unsatisfactory, there is more serious superimposed phenomenon, for improving the consistency of MMT and macromolecular material, often need carry out chemically modified modification to MMT.

Summary of the invention

In order to improve the intensity of woven bag matrix material further, first the present invention has prepared a kind of polynite (FMMT) of chemical modification, then it can be used as additive and PP matrix compound, improves the intensity of PP matrix material.Paper examines FMMT is on the impact of composite materials property.

The preparation process of the polynite (FMMT) of chemical modification is as follows:

30 g polynites and 700 mL deionized waters are added in l000 mL there-necked flask, high speed high-speed stirring is even, leave standstill 24 h, discard the aqueous dispersions that lower sediment gets upper strata polynite, the cetyl trimethylammonium bromide (CATB) of 20 g and concentrated hydrochloric acid are adjusted in 80 DEG C of water stir and form the protonated solution of CATB, it is dropwise added drop-wise in polynite aqueous dispersions, by this mixed solution high-speed stirring 2 h at 80 DEG C, then at room temperature suction filtration, reduces Br with deionized water repetitive scrubbing throw out ^-concentration, until with the AgNO of 0.l mol/L ₃solution detects and generates without pale yellow precipitate, and products obtained therefrom is dried to constant weight in 80 DEG C of baking ovens, then uses mortar porphyrize, can obtain FMMT.

Raman (Raman) spectrogram of MMT and FMMT is shown in Fig. 1 and Fig. 2 respectively.Comparison diagram 1 and Fig. 2, can find, is 2851.0 cm in wave number in Fig. 2 ^-1with 2922.4 cm ^-1place has more two absorption peaks, i.e. the absorption peak of alkyl group, and the existence having cetyltrimethyl ammonium salt in the polynite processed is described, can assert the Na in the positively charged ion of cetyltrimethyl ammonium salt and polynite ⁺there occurs ion-exchange, therefore can affirm, through ion exchange, organic cation intercalation enters between cheating engaging layer.By this chemically modified modification, MM T becomes lipophilicity from wetting ability.

The X-ray diffraction analysis (XRD) of MMT and FMMT is respectively as Fig. 3 and Fig. 4.In Fig. 3, there is a wide and weak diffraction peak in 2 θ=7.24 ° in spectrogram, correspond to MMT(001) diffraction peak of crystal face.Can calculate MMT sheet interlayer spacing according to bragg's formula is 1.23 nm, and spacing is less, mainly owing to not carrying out relevant modification to MMT, so there is no intercalator and inserts between lamella.In Fig. 4, after CATB modifying and decorating, the spectrogram of FMMT in 2 θ=2.24 ° and ° place, 2 θ=4.43 there are two stronger diffraction peaks, corresponding sheet interlayer spacing can be calculated according to bragg's formula and be respectively 3.98 nm and 1.20 nm, all be greater than the sheet interlayer spacing of 1.23 nm of MMT.This mainly because by chemical modification, makes CATB be inserted in the middle of MMT lamella, struts lamella, cause sheet interlayer spacing to increase, and the CATB of insertion measures more, and the softened degree of lamella is larger, and corresponding sheet interlayer spacing is larger.

The preparation flow of high tenacity weaving bag matrix material is as follows:

By other auxiliary agent premixs such as raw material polypropylene, filling master batch, antiaging agent, pigment evenly, FMMT is added evenly mixing; Be extruded as film through die head is shaping, through overcooling, become embryo silk by blade cuts, and to be stretched formation flat filament through baking oven; Flat filament, through heat setting type, shrinks when low pulling speed, and processes at low temperatures, shaping finally by winding system rolling; Circular knitting machines becomes yardage roll, is finally cut into woven bag.

Accompanying drawing explanation

Fig. 1 is the infrared spectrum of MMT.

Fig. 2 is the infrared spectrum of FMMT.

Fig. 3 is the XRD spectra of MMT.

Fig. 4 is the XRD spectra of FMMT.

Embodiment

Below in conjunction with specific embodiment, the present invention is further illustrated.

Embodiment 1

By even for other auxiliary agent premixs such as raw material polypropylene, filling master batch, antiaging agent, pigment; Be extruded as film through die head is shaping, through overcooling, become embryo silk by blade cuts, and to be stretched formation flat filament through baking oven; Flat filament, through heat setting type, shrinks when low pulling speed, and processes at low temperatures, shaping finally by winding system rolling; Circular knitting machines becomes yardage roll, is finally cut into woven bag.

This sample trial production flat filament, its filament strength is 0.32 N/tex, and finished bag average intensity is 809 N/tex, and drop test percent of pass is 65.7%.

Embodiment 2

By other auxiliary agent premixs such as raw material polypropylene, filling master batch, antiaging agent, pigment evenly, FMMT is added evenly mixing; Be extruded as film through die head is shaping, through overcooling, become embryo silk by blade cuts, and to be stretched formation flat filament through baking oven; Flat filament, through heat setting type, shrinks when low pulling speed, and processes at low temperatures, shaping finally by winding system rolling; Circular knitting machines becomes yardage roll, is finally cut into woven bag.

This sample trial production flat filament, its filament strength is 0.78 N/tex, and finished bag average intensity is 1252.36 N/tex, and drop test percent of pass is 100%.

Above to invention has been exemplary description; should be noted that; when not departing from core of the present invention, any simple distortion, amendment or other those skilled in the art can not spend the equivalent replacement of creative work all to fall into protection scope of the present invention.

Claims (2)

1. a high strength braiding polypropylene composite material, is characterized in that comprising the steps:

The preparation process of the polynite (FMMT) of chemical modification is as follows:

A certain amount of polynite and deionized water is added in there-necked flask, high speed high-speed stirring is even, leave standstill 24 h, discard the aqueous dispersions that lower sediment gets upper strata polynite, a certain amount of cetyl trimethylammonium bromide (CATB) and concentrated hydrochloric acid are adjusted in 80 DEG C of water stir and form the protonated solution of CATB, it is dropwise added drop-wise in polynite aqueous dispersions, by this mixed solution high-speed stirring 2 h at 80 DEG C, then at room temperature suction filtration, reduces Br with deionized water repetitive scrubbing throw out ^-concentration, until with the AgNO of 0.l mol/L ₃solution detects and generates without pale yellow precipitate, and products obtained therefrom is dried to constant weight in 80 DEG C of baking ovens, then uses mortar porphyrize, can obtain FMMT.

2. the preparation process of high tenacity weaving bag is as follows:

By other auxiliary agent premixs such as raw material polypropylene, filling master batch, antiaging agent, pigment evenly, FMMT is added evenly mixing; Be extruded as film through die head is shaping, through overcooling, become embryo silk by blade cuts, and to be stretched formation flat filament through baking oven; Flat filament, through heat setting type, shrinks when low pulling speed, and processes at low temperatures, shaping finally by winding system rolling; Circular knitting machines becomes yardage roll, is finally cut into woven bag.