CN104845125A - Carbon-fiber-filled modified PET/PTT alloy and preparation method thereof - Google Patents

Abstract

The invention discloses a carbon-fiber-filled modified PET/PTT alloy and a preparation method thereof. The carbon-fiber-filled modified PET/PTT alloy provided by the invention comprises the following components by weight: 50% to 70% of PET,15% to 30% of PTT, 2% to 4% of SMA, 5% to 15% of modified carbon fiber, 5% to 8% of a plasticizer, 0.5% to 1% of a nucleating agent, 0.1% to 0.5% of an antioxidant and 0.1% to 1% of a lubricant, wherein the modified carbon fiber is chopped polypropionitrile carbon fiber which undergoer surface electrochemical polymerization treatment. The invention has the following beneficial effects: electrochemical polymerization treatment of the carbon fiber greatly improves wettability and reactivity of the surface of the carbon fiber, therefore greatly improving strength, rigidity, modulus, crystalline orientation degree and the like of the alloy; meanwhile, the alloy maintains respective original advantages of PET and PTT and has good practical value and popularization and application prospects.

Description

Filled with carbon fibers modified PET/PTT Alloy And Preparation Method

Technical field

The present invention relates to technical field of polymer materials, specifically a kind of filled with carbon fibers modified PET/PTT Alloy And Preparation Method.

Background technology

Polyethylene terephthalate (PET) a kind ofly has higher melt temperature and the crystalline polymer of second-order transition temperature, excellent physicals and mechanical property is kept in certain temperature range, its resistance to fatigue, rub resistance, ageing resistance, electrical insulating property feature are very outstanding, to most of organic solvent and acid more stable, production energy consumption is lower, is thus widely used in the fields such as synthon, film and engineering plastics; But because PET rigidity is comparatively forced toughness of material is poor, crystallization velocity is comparatively slow, the shortcomings such as the high and shaping cycle of forming mould temperature is long, greatly limit its range of application.Poly(Trimethylene Terephthalate) (PTT) is that a kind of crystallization velocity is fast, happy and harmonious temperature and the lower crystalline polymer of second-order transition temperature, there is excellent especially flexibility, elastic recovery, the stability feature of processing characteristics, electric property, mechanical property and size; PTT fiber maintains excellent crease resistance and the chemical resistant properties of PET fiber, flexibility, anti-Japanese photosensitiveness, resistance to soiling, low static behaviour, easy dyeing, low water absorption have the features such as certain hydrolytic stability.But its modulus is lower, material is softer limits PTT use range.By the PET/PTT alloy of blended for PET and PTT preparation, performance can be learnt from other's strong points to offset one's weaknesses, also there is the premium propertiess such as excellent forming process, shock resistance, high temperature heat-resistant are aging, chemical-resistant resistance simultaneously.But consistency is bad, mechanical strength is unstable problem that the PET/PTT alloy of non-modified exists, will greatly limit its effect and Application Areas.In order to obtain high performance PET/PTT alloy, often needing to add three components, to improve the performance of PET/PTT, promoting effect and the Application Areas of PET/PTT better.Carbon fiber, due to advantages such as density is little, specific tenacity is high, chemical stability is good, formings, will have very high practical value with filled with carbon fibers PET/PTT alloy.

Summary of the invention

The object of the present invention is to provide the filled with carbon fibers modified PET/PTT Alloy And Preparation Method of a kind of high strength, low cost.

The technical solution adopted for the present invention to solve the technical problems is: filled with carbon fibers modified PET/PTT alloy, and its component by mass percent proportioning is: PET 50% ~ 70%, PTT 15% ~ 30%, SMA 2% ~ 4%, modified carbon fiber 5% ~ 15%, softening agent 5% ~ 8%, nucleator 0.5% ~ 1%, oxidation inhibitor 0.1% ~ 0.5%, lubricant 0.1% ~ 1%.

Described PET is polyethylene terephthalate.

Described PTT is Poly(Trimethylene Terephthalate).

Described SMA is styrene-grafted copolymer-maleic anhydride.

Described modified carbon fiber is that poly-propionitrile carbon fiber is cut through the short of electrochemical polymerization process in surface.

Described softening agent is the thermoplastic polyether ester TPEE of mass ratio 5:1 and the compound of poly-hexanodioic acid isobutyl diester.

Described nucleator is the one in nano silicon, sodium bicarbonate, Sodium Benzoate.

Described oxidation inhibitor is the one in the compound of antioxidant 1010, antioxidant 1076, antioxidant 1010 or antioxidant 1076 and irgasfos 168.

Described lubricant is pentaerythritol stearate.

The preparation method of above-mentioned filled with carbon fibers modified PET/PTT alloy, comprises the following steps:

(1), by PET and PTT in forced air circulation baking oven at 110 DEG C ~ 120 DEG C temperature dry 6 ~ 8 hours, stand-by;

(2), surface treatment of carbon fibers: cut poly-propionitrile carbon fiber make anode with short, stainless steel plate makes negative electrode, electropolymerization liquid is the styrene-maleic anhydride of initial anion concentration at 0.2 ~ 3.0mol/L, ethylene methacrylic ether maleic anhydride, a kind of ammonium salt aqueous solution in ethylene acrylic acid co polymer, temperature 4 DEG C ~ 28 DEG C, cyclic voltammetric current potential is at-0.8 ~ 0.3V, 30 ~ 200 minutes treatment times, make carbon fiber surface formation of deposits one deck polymeric membrane, and with deionized water rinsing 3 ~ 5 times, again at the vacuum oven 24 ~ 48h of 80 DEG C ~ 150 DEG C, obtain described modified carbon fiber, stand-by,

(3), taking dry PET and PTT by weight ratio adds in super mixer, add SMA, softening agent, nucleator, oxidation inhibitor, lubricant by weight ratio simultaneously, and add the obtained modified carbon fiber of step (2) by weight ratio, make to be mixed together 3 ~ 15 minutes, after fully mixing, discharging;

(4), the discharging of step (3) is added in twin screw extruder, through melting mixing, extruding pelletization at 210 DEG C ~ 280 DEG C temperature, obtain filled with carbon fibers of the present invention modified PET/PTT alloy.

The invention has the beneficial effects as follows, the present invention passes through carbon fiber through electrochemical polymerization process, drastically increase carbon fiber surface wetting property and reactivity, and then substantially increase the intensity of material, rigidity, modulus and crystalline orientation degree etc., but also maintain PET and PTT original advantage performance separately, there is good practical value and popularizing application prospect.

Embodiment

Technical scheme of the present invention is further illustrated below in conjunction with specific embodiment.

Embodiment 1:

A kind of filled with carbon fibers modified PET/PTT alloy, its component by mass percent proportioning is: PET 50%, PTT 30%, SMA 3%, modified carbon fiber 10%, softening agent 5%, sodium bicarbonate 1%, antioxidant 1010 0.2%, pentaerythritol stearate 0.8%, described modified carbon fiber is that poly-propionitrile carbon fiber is cut through the short of electrochemical polymerization process in surface, and described softening agent is the thermoplastic polyether ester TPEE of mass ratio 5:1 and the compound of poly-hexanodioic acid isobutyl diester.

Preparation method: (1), by PET and PTT in forced air circulation baking oven at 110 DEG C ~ 120 DEG C temperature dry 6 ~ 8 hours, stand-by, (2), surface treatment of carbon fibers: cut poly-propionitrile carbon fiber make anode with short, stainless steel plate makes negative electrode, electropolymerization liquid is the styrene-maleic anhydride of initial anion concentration at 0.2 ~ 3.0mol/L, ethylene methacrylic ether maleic anhydride, a kind of ammonium salt aqueous solution in ethylene acrylic acid co polymer, temperature 4 DEG C ~ 28 DEG C, cyclic voltammetric current potential is at-0.8 ~ 0.3V, 30 ~ 200 minutes treatment times, make carbon fiber surface formation of deposits one deck polymeric membrane, and with deionized water rinsing 3 ~ 5 times, again at the vacuum oven 24 ~ 48h of 80 DEG C ~ 150 DEG C, obtain described modified carbon fiber, stand-by, (3), taking dry PET and PTT by weight ratio adds in super mixer, add SMA, softening agent, sodium bicarbonate, antioxidant 1010, pentaerythritol stearate by weight ratio simultaneously, and add the obtained modified carbon fiber of step (2) by weight ratio, make to be mixed together 3 ~ 15 minutes, after fully mixing, discharging, (4), the discharging of step (3) is added in twin screw extruder, through melting mixing, extruding pelletization at 210 DEG C ~ 280 DEG C temperature, obtain filled with carbon fibers of the present invention modified PET/PTT alloy.

Embodiment 2:

A kind of filled with carbon fibers modified PET/PTT alloy, its component by mass percent proportioning is: the compound 0.1% of PET 62%, PTT 15%, SMA 2%, modified carbon fiber 15%, softening agent 5%, Sodium Benzoate 0.5%, antioxidant 1076 and irgasfos 168, pentaerythritol stearate 0.4%, described modified carbon fiber is that poly-propionitrile carbon fiber is cut through the short of electrochemical polymerization process in surface, and described softening agent is the thermoplastic polyether ester TPEE of mass ratio 5:1 and the compound of poly-hexanodioic acid isobutyl diester.

Preparation method: (1), by PET and PTT in forced air circulation baking oven at 110 DEG C ~ 120 DEG C temperature dry 6 ~ 8 hours, stand-by, (2), surface treatment of carbon fibers: cut poly-propionitrile carbon fiber make anode with short, stainless steel plate makes negative electrode, electropolymerization liquid is the styrene-maleic anhydride of initial anion concentration at 0.2 ~ 3.0mol/L, ethylene methacrylic ether maleic anhydride, a kind of ammonium salt aqueous solution in ethylene acrylic acid co polymer, temperature 4 DEG C ~ 28 DEG C, cyclic voltammetric current potential is at-0.8 ~ 0.3V, 30 ~ 200 minutes treatment times, make carbon fiber surface formation of deposits one deck polymeric membrane, and with deionized water rinsing 3 ~ 5 times, again at the vacuum oven 24 ~ 48h of 80 DEG C ~ 150 DEG C, obtain described modified carbon fiber, stand-by, (3), taking dry PET and PTT by weight ratio adds in super mixer, add compound, the pentaerythritol stearate of SMA, softening agent, Sodium Benzoate, antioxidant 1076 and irgasfos 168 by weight ratio simultaneously, and add the obtained modified carbon fiber of step (2) by weight ratio, make to be mixed together 3 ~ 15 minutes, after fully mixing, discharging, (4), the discharging of step (3) is added in twin screw extruder, through melting mixing, extruding pelletization at 210 DEG C ~ 280 DEG C temperature, obtain filled with carbon fibers of the present invention modified PET/PTT alloy.

Claims (7)

1. filled with carbon fibers modified PET/PTT alloy, it is characterized in that, its component by mass percent proportioning is: PET 50% ~ 70%, PTT 15% ~ 30%, SMA 2% ~ 4%, modified carbon fiber 5% ~ 15%, softening agent 5% ~ 8%, nucleator 0.5% ~ 1%, oxidation inhibitor 0.1% ~ 0.5%, lubricant 0.1% ~ 1%.

2. filled with carbon fibers modified PET/PTT alloy according to claim 1, is characterized in that, described modified carbon fiber is that poly-propionitrile carbon fiber is cut through the short of electrochemical polymerization process in surface.

3. filled with carbon fibers modified PET/PTT alloy according to claim 1, is characterized in that, described softening agent is the thermoplastic polyether ester TPEE of mass ratio 5:1 and the compound of poly-hexanodioic acid isobutyl diester.

4. filled with carbon fibers modified PET/PTT alloy according to claim 1, is characterized in that, described nucleator is the one in nano silicon, sodium bicarbonate, Sodium Benzoate.

5. filled with carbon fibers modified PET/PTT alloy according to claim 1, is characterized in that, described oxidation inhibitor is the one in the compound of antioxidant 1010, antioxidant 1076, antioxidant 1010 or antioxidant 1076 and irgasfos 168.

6. filled with carbon fibers modified PET/PTT alloy according to claim 1, is characterized in that, described lubricant is pentaerythritol stearate.

7. the preparation method of filled with carbon fibers modified PET/PTT alloy according to claim 1, is characterized in that, comprise the following steps:

(1), by PET and PTT in forced air circulation baking oven at 110 DEG C ~ 120 DEG C temperature dry 6 ~ 8 hours, stand-by;

(2), surface treatment of carbon fibers: cut poly-propionitrile carbon fiber make anode with short, stainless steel plate makes negative electrode, electropolymerization liquid is the styrene-maleic anhydride of initial anion concentration at 0.2 ~ 3.0mol/L, ethylene methacrylic ether maleic anhydride, a kind of ammonium salt aqueous solution in ethylene acrylic acid co polymer, temperature 4 DEG C ~ 28 DEG C, cyclic voltammetric current potential is at-0.8 ~ 0.3V, 30 ~ 200 minutes treatment times, make carbon fiber surface formation of deposits one deck polymeric membrane, and with deionized water rinsing 3 ~ 5 times, again at the vacuum oven 24 ~ 48h of 80 DEG C ~ 150 DEG C, obtain described modified carbon fiber, stand-by,

(3), taking dry PET and PTT by weight ratio adds in super mixer, add SMA, softening agent, nucleator, oxidation inhibitor, lubricant by weight ratio simultaneously, and add the obtained modified carbon fiber of step (2) by weight ratio, make to be mixed together 3 ~ 15 minutes, after fully mixing, discharging;

(4), the discharging of step (3) is added in twin screw extruder, through melting mixing, extruding pelletization at 210 DEG C ~ 280 DEG C temperature, obtain filled with carbon fibers of the present invention modified PET/PTT alloy.