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TPV (Thermoplastic Vulcanizate) material with good welding property and machining method thereof
Description
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Technical field: the invention belongs to thermoplastic elastic material production technical field, be specifically related to a kind of TPV material and working method of good welding performance.
Background technology: at present, TPV material is that EPDM is in dynamic vulcanization process, be sheared into micro-size particles, and be dispersed in PP plastics mutually in, formed the blend of unique two-phase coexistent, this special construction, in carrying out the process of material later stage welding, because rubber phase vulcanizes and not melting more, and PP is dispersed in the inierpeneirating network structure of rubber phase mutually greatly, a large amount of existence of rubber phase reduce the thermally melting of plastics phase, and its shortcoming is, the welding property of material is poor, and welding strength is low.
Summary of the invention: the object of this invention is to provide a kind of good welding performance, TPV material and the working method of the good welding performance that welding strength is high.
Technical scheme of the present invention is: a kind of TPV material of good welding performance, is characterized in that being comprised of by weight following component: PP 20-30, EPDM 30-40, copolymer from ethylene and propylene 10-15, paraffin oil 20-30, talcum powder 10-15, vulcanizing agent 0.5-1.5.Wherein, described vulcanizing agent is octyl phenol urea formaldehyde and tin protochloride by weight the composition of 4: 1.
A working method for the TPV material of good welding performance, is characterized in that comprising following processing step:
(1) mixing: other component of a half-sum of the PP share in above-mentioned component is added at normal temperatures together in mixing roll and carried out mixing 10～15 minutes;
(2) dynamic vulcanization: by side direction feeding equipment feeding twin screw extruder, be 300～600 rev/min at engine speed by above-mentioned miscellany, melt temperature is to carry out dynamic vulcanization cutting work in-process particle after 1～2 minute under the condition of 200～230 ℃;
(3) melt blending: carry out melt blending 1～2 minute by twin screw extruder after work in-process particle and remaining PP are mixed, then carry out pelletizing and through super-dry, particle is packaged into finished product by underwater cutpellet equipment.
Its best-of-breed technology scheme is: a kind of TPV material of good welding performance, is characterized in that being comprised of by weight following component: PP25, EPDM35, copolymer from ethylene and propylene 12.5, paraffin oil 25, talcum powder 12.5, vulcanizing agent 1.Wherein, described vulcanizing agent is octyl phenol urea formaldehyde and tin protochloride by weight the composition of 4: 1.
A working method for the TPV material of good welding performance, is characterized in that comprising following processing step:
(1) mixing: other component of a half-sum of the PP share in above-mentioned component is added at normal temperatures together in mixing roll and carried out mixing 10～15 minutes;
(2) dynamic vulcanization: by side direction feeding equipment feeding twin screw extruder, be 300～600 rev/min at engine speed by above-mentioned miscellany, melt temperature is to carry out dynamic vulcanization cutting work in-process particle after 1～2 minute under the condition of 200～230 ℃;
(3) melt blending: carry out melt blending 1～2 minute by twin screw extruder after work in-process particle and remaining PP are mixed, then carry out pelletizing and through super-dry, particle is packaged into finished product by underwater cutpellet equipment.
The invention has the beneficial effects as follows, first that 1/2PP, EPDM, copolymer from ethylene and propylene and other auxiliary agents is mixing, carry out again dynamic vulcanization, make EPDM be cross-linked and be dispersed in PP phase neutralization of ethylene and propylene copolymer with micron order size uniform, copolymer from ethylene and propylene, because of the singularity of its structure, has part rebound characteristics, and the consistency of copolymer from ethylene and propylene and EPDM and PP is all fine, because of it, be not cross-linked, can serve as partial continuous phase again simultaneously; Through dynamic vulcanization reaction, generate TPV work in-process particle; Finally TPV work in-process particle and remaining PP are carried out to melt blending, under the effect of high temperature, high-shear, pass through twin screw extruder, make material obtain the good elastic while, the ratio of external phase is increased to some extent, in second melting Blending Processes, dose part PP, reduced the amount that enters the PP in vulcanized rubber inierpeneirating network structure, made the thermally melting of whole TPV material better, thereby made material obtain good welding property.The TPV material of making has good welding performance, the advantage that welding strength is high.
Embodiment: further illustrate technical scheme of the present invention below in conjunction with specific embodiment.
Embodiment 1: a kind of TPV material of good welding performance, is characterized in that being comprised of by weight following component: PP 30, EPDM 30, copolymer from ethylene and propylene 10, paraffin oil 20, talcum powder 15, octyl phenol urea formaldehyde and tin protochloride be the composition 1.5 of 4: 1 by weight.
A working method for the TPV material of good welding performance, is characterized in that comprising following processing step:
(1) mixing: other component of a half-sum of the PP share in above-mentioned component is added at normal temperatures together in mixing roll and carried out mixing 10～15 minutes;
(2) dynamic vulcanization: by side direction feeding equipment feeding twin screw extruder, be 300～600 rev/min at engine speed by above-mentioned miscellany, melt temperature is to carry out dynamic vulcanization cutting work in-process particle after 1～2 minute under the condition of 200～230 ℃;
(3) melt blending: carry out melt blending 1～2 minute by twin screw extruder after work in-process particle and remaining PP are mixed, then carry out pelletizing and through super-dry, particle is packaged into finished product by underwater cutpellet equipment.
Embodiment 2: a kind of TPV material of good welding performance, is characterized in that being comprised of by weight following component: PP 20, EPDM 40, copolymer from ethylene and propylene 15, paraffin oil 30, talcum powder 10, octyl phenol urea formaldehyde and tin protochloride be the composition 0.5 of 4: 1 by weight.
A working method for the TPV material of good welding performance, is characterized in that comprising following processing step:
(1) mixing: other component of a half-sum of the PP share in above-mentioned component is added at normal temperatures together in mixing roll and carried out mixing 10～15 minutes;
(2) dynamic vulcanization: by side direction feeding equipment feeding twin screw extruder, be 300～600 rev/min at engine speed by above-mentioned miscellany, melt temperature is to carry out dynamic vulcanization cutting work in-process particle after 1～2 minute under the condition of 200～230 ℃;
(3) melt blending: carry out melt blending 1～2 minute by twin screw extruder after work in-process particle and remaining PP are mixed, then carry out pelletizing and through super-dry, particle is packaged into finished product by underwater cutpellet equipment.
Embodiment 3: a kind of TPV material of good welding performance, is characterized in that being comprised of by weight following component: PP 25, EPDM 35, copolymer from ethylene and propylene 12.5, paraffin oil 25, talcum powder 12.5, octyl phenol urea formaldehyde and tin protochloride be the composition 1 of 4: 1 by weight.
A working method for the TPV material of good welding performance, is characterized in that comprising following processing step:
(1) mixing: other component of a half-sum of the PP share in above-mentioned component is added at normal temperatures together in mixing roll and carried out mixing 10～15 minutes;
(2) dynamic vulcanization: by side direction feeding equipment feeding twin screw extruder, be 300～600 rev/min at engine speed by above-mentioned miscellany, melt temperature is to carry out dynamic vulcanization cutting work in-process particle after 1～2 minute under the condition of 200～230 ℃;
(3) melt blending: carry out melt blending 1～2 minute by twin screw extruder after work in-process particle and remaining PP are mixed, then carry out pelletizing and through super-dry, particle is packaged into finished product by underwater cutpellet equipment.
The test result of material of the present invention is: shore hardness (10sec): 60-80A; Tensile strength (500mm/min): 8.0～12.0MPa; Elongation at break (500mm/min): 350～550%; Melting index (230 ℃ of * 5k): 0.5-2.5g/10min.By contrast, this TPV material is compared with general purpose grade TPV material, and properties is suitable, and welding property and welding strength obviously improve.
Claims (4)
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Claims (4)
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1. a TPV material for good welding performance, is characterized in that being comprised of by weight following component: PP 20-30, EPDM 30-40, copolymer from ethylene and propylene 10-15, paraffin oil 20-30, talcum powder 10-15, vulcanizing agent 0.5-1.5.
2. by the TPV material of a kind of good welding performance claimed in claim 1, it is characterized in that being formed by weight by following component: PP25, EPDM35, copolymer from ethylene and propylene 12.5, paraffin oil 25, talcum powder 12.5, vulcanizing agent 1.
3. by the TPV material of a kind of good welding performance described in claim 1 or 2, it is characterized in that, described vulcanizing agent is octyl phenol urea formaldehyde and tin protochloride by weight the composition of 4: 1.
4. a working method for the TPV material of good welding performance, is characterized in that comprising following processing step:
(1) mixing: other component of a half-sum of the PP share in above-mentioned component is added at normal temperatures together in mixing roll and carried out mixing 10～15 minutes;
(2) dynamic vulcanization: by side direction feeding equipment feeding twin screw extruder, be 300～600 rev/min at engine speed by above-mentioned miscellany, melt temperature is to carry out dynamic vulcanization cutting work in-process particle after 1～2 minute under the condition of 200～230 ℃;
(3) melt blending: carry out melt blending 1～2 minute by twin screw extruder after work in-process particle and remaining PP are mixed, then carry out pelletizing and through super-dry, particle is packaged into finished product by underwater cutpellet equipment.