CN106700429A - Process for enhancing PBT bending resistant and grinding performance - Google Patents
Process for enhancing PBT bending resistant and grinding performance Download PDFInfo
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- CN106700429A CN106700429A CN201510440131.6A CN201510440131A CN106700429A CN 106700429 A CN106700429 A CN 106700429A CN 201510440131 A CN201510440131 A CN 201510440131A CN 106700429 A CN106700429 A CN 106700429A
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Abstract
The invention discloses a process for enhancing PBT bending resistant and grinding performance; the key point of the technical scheme comprises that the process for enhancing the PBT bending resistant and grinding performance. The process comprises the steps: grinding a PBT raw material into a PBT powder; putting the PBT powder into a powder screening machine for screening, and screening out a PBT powder with the particle diameter of 5-20 [mu]m; carrying out heat preservation of molten PBT in a 160-180 DEG C rotating reaction kettle for 1 h, wherein the rotation speed of the rotating reaction kettle is 40-60 rpm; carrying out heat preservation for 1-2 h in the rotating reaction kettle having the rotating reaction kettle temperature increased to 200-220 DEG C, and then carrying out heat preservation for 1-2 h in the rotating reaction kettle having the rotating reaction kettle temperature dropped to 160-180 DEG C, wherein the rotation speed of the rotating reaction kettle is 40-60 rpm; repeating the operations for two times; and extruding the molten PBT obtained in the step six through an extruder, to obtain the finished product. The bending modulus of PBT plastics is up to 2700 MPa by repeated heating and heat preservation.
Description
Technical field
The present invention relates to field of plastics processing, more specifically, it relates to a kind of counter-bending and grinding performance the techniques of enhancing PBT.
Background technology
Polybutylene terephthalate (PBT)（Polybutylene terephthalate）, also known as the methine ester of poly terephthalic acid four, abbreviation PBT.It is the condensation polymer of terephthalic acid (TPA).PBT plastic has good mechanical performance in itself, such as intensity is high, fatigue durability, dimensionally stable, so modern industrialization production is larger to PBT demands, but the wear-resisting and anti-bending strength of general PBT plastic is poor, for example during the bristle of production toothbrush, remaining performance of PBT leads over other materials, such as solvent resistance, after i.e. bristle is contacted with toothpaste always, bristle surface will not dissolve and corrode, but PBT bristles are easy to occur bending and deformation after, the service life of bristle is influenceed.
The patent of invention of Application No. " 201310129050.5 " discloses a kind of processing technology of PBT bluenesss masterbatch, but the wear-resisting and bending resistance of this kind of PBT masterbatch of processing technology output is excessively poor, is unsuitable for the occasion of some wear-resisting and frequent bendings.
Found through experiment, by modified to PBT, its counter-bending and grinding performance can be greatly promoted, the industrial products needs that satisfaction can be worn, general plastics upon wear, can produce the chip of adhesion, while when chip is removed, related a part for product can also be removed, influence the performance of product.
The content of the invention
In view of the shortcomings of the prior art, a kind of technique of counter-bending it is an object of the invention to provide enhancing PBT and grinding performance.
To achieve the above object, the invention provides following technical scheme：A kind of counter-bending and grinding performance the techniques of enhancing PBT, it is characterised in that：
Step one, by PBT raw mills into PBT powders；
Step 2, will PBT powders put into powder screening machine in screen, filter out the PBT powders of 5 ~ 20 μm of particle diameter；
Step 3, PBT powders and heat stabilizer are put into temperature simultaneously to be heated in the revolving reaction kettle of 160-180 degree, PBT powders is melted to molten, the rotary speed of revolving reaction kettle is 40 to 60 rpms；
Step 4, the PBT of molten is incubated 1 hour in the revolving reaction kettle of 160-180 degree, the rotary speed of revolving reaction kettle is 40 to 60 rpms；
Step 5, the temperature of revolving reaction kettle is promoted in the revolving reaction kettle of 200-220 degree and is incubated 1-2 hours, then 1-2 hours will be incubated in the revolving reaction kettle of the greenhouse cooling of revolving reaction kettle to 160-180 degree, the rotary speed of revolving reaction kettle is 40 to 60 rpms；
Step 6, repeat step five operation it is secondary；
Step 7, the PBT of the molten that will be obtained in step 6 are extruded by extruder, obtain finished product.
Preferably, the air pressure of the revolving reaction kettle is -1 to -0.9MPa.
Preferably, the heat stabilizer is using the one kind in zinc stearate heat stabilizer or calcium stearate heat stabilizer.
Preferably, 0.6%-2% of the heat stabilizer weight for material gross weight.
Preferably, the revolving reaction kettle temperature degree in the step 3 is 169 degree.
Preferably, the rotating speed of the revolving reaction kettle is 42 rpms.
Preferably, the soaking time in the step 5 is 1.5 hours.
By using above-mentioned technical proposal, by the heating repeatedly in step 5, when temperature is in low spot, the intermolecular adhesion of PBT plastic is deteriorated, conveniently carry out rotation mixing, when being incubated at high temperature simultaneously, the intermolecular adhesion of PBT plastic becomes strong, make the molecules align of PBT plastic even closer, strengthen the bonding strength of PBT plastic, improve the bending modulus of PBT plastic, be incubated by the heating and heat preservation in repeat step five and cooling, the tight ness rating of raising PBT plastic molecules align that can be multiple, so that the bending modulus of final PBT plastic is more than 2600Pa.
Specific embodiment
Embodiment one obtains finished product by following steps, while the air pressure in revolving reaction kettle is -0.97Mpa：
Step one, by the PBT raw mills of 30KG into PBT powders；
Step 2, will PBT powders put into powder screening machine in screen, the PBT powders weight for filtering out 5 μm of particle diameter is 28KG；
Step 3, by the PBT powders of 28KG and 169g zinc stearate heat stabilizers, that is the zinc stearate heat stabilizer of gross weight 0.6%, while being heated in putting into the revolving reaction kettle that temperature is 170 degree, PBT powders are made to melt to molten, the rotary speed of revolving reaction kettle is 40 rpms；
Step 4, the PBT of molten is incubated 1 hour in 170 degree of revolving reaction kettle, the rotary speed of revolving reaction kettle is 40 rpms；
Step 5, the temperature of revolving reaction kettle is promoted in 200 degree of revolving reaction kettle and is incubated 1 hour, then will be incubated 1 hour in the revolving reaction kettle of the greenhouse cooling of revolving reaction kettle to 160 degree, the rotary speed of revolving reaction kettle is 55 rpms；
Step 6, repeat step five operation it is secondary；
Step 7, the PBT of the molten that will be obtained in step 6 are extruded by extruder, obtain finished product.
Embodiment two obtains finished product by following steps, while the air pressure in revolving reaction kettle is -0.92Mpa：
Step one, by the PBT raw mills of 30KG into 8 μm of PBT powders；
Step 2, will 30KG PBT powders input powder screening machine in screen, filter out the PBT powders 27KG of 8 μm of particle diameter；
Step 3, the calcium stearate heat stabilizer by the PBT powders of 27KG and 551g, that is the heat stabilizer of the 2% of gross weight, while being heated in putting into the revolving reaction kettle that temperature is 160 degree, PBT powders are made to melt to molten, the rotary speed of revolving reaction kettle is 50 rpms；
Step 4, the PBT of molten is incubated 1 hour in 160 degree of revolving reaction kettle, the rotary speed of revolving reaction kettle is 50 rpms；
Step 5, the temperature of revolving reaction kettle is promoted in 200 degree of revolving reaction kettle and is incubated 1.5 hours, then will be incubated 1.5 hours in the revolving reaction kettle of the greenhouse cooling of revolving reaction kettle to 170 degree, the rotary speed of revolving reaction kettle is 42 rpms；
Step 6, repeat step five operation it is secondary；
Step 7, the PBT of the molten that will be obtained in step 6 are extruded by extruder, obtain finished product.
In embodiment three, product is obtained by following steps, while the air pressure in revolving reaction kettle is -1Mpa：
Step one, by the PBT raw mills of 30KG into 10 μm of PBT powders；
Step 2, will 30KG PBT powders input powder screening machine in screen, filter out the PBT powders 27KG of 10 μm of particle diameter；
Step 3, the calcium stearate heat stabilizer by the PBT powders of 27KG and 300g, while being heated in putting into the revolving reaction kettle that temperature is 169 degree, make PBT powders melt to molten, and the rotary speed of revolving reaction kettle is 45 rpms；
Step 4, the PBT of molten is incubated 1 hour in 169 degree of revolving reaction kettle, the rotary speed of revolving reaction kettle is 45 rpms；
Step 5, the temperature of revolving reaction kettle is promoted in 210 degree of revolving reaction kettle and is incubated 1 hour, then will be incubated 1.4 hours in the revolving reaction kettle of the greenhouse cooling of revolving reaction kettle to 165 degree, the rotary speed of revolving reaction kettle is 60 rpms；
Step 6, repeat step five operation it is secondary；
Step 7, the PBT of the molten that will be obtained in step 6 are extruded by extruder, obtain finished product.
In example IV, product is obtained by following steps, while the air pressure in revolving reaction kettle is -0.95Mpa：
Step one, by the PBT raw mills of 30KG into 15 μm of PBT powders；
Step 2, will 30KG PBT powders input powder screening machine in screen, filter out the PBT powders 27KG of 15 μm of particle diameter；
Step 3, the calcium stearate heat stabilizer by the PBT powders of 27KG and 270g, while being heated in putting into the revolving reaction kettle that temperature is 155 degree, make PBT powders melt to molten, and the rotary speed of revolving reaction kettle is 30 rpms；
Step 4, the PBT of molten is incubated 1 hour in 155 degree of revolving reaction kettle, the rotary speed of revolving reaction kettle is 40 rpms；
Step 5, the temperature of revolving reaction kettle is promoted in 220 degree of revolving reaction kettle and is incubated 2 hours, then will be incubated 1.7 hours in the revolving reaction kettle of the greenhouse cooling of revolving reaction kettle to 175 degree, the rotary speed of revolving reaction kettle is 53 rpms；
Step 6, repeat step five operation it is secondary；
Step 7, the PBT of the molten that will be obtained in step 6 are extruded by extruder, obtain finished product.
In embodiment five, product is obtained by following steps, while the air pressure in revolving reaction kettle is -1Mpa：
Step one, by the PBT raw mills of 30KG into 20 μm of PBT powders；
Step 2, will 30KG PBT powders input powder screening machine in screen, filter out the PBT powders 27KG of 20 μm of particle diameter；
Step 3, the calcium stearate heat stabilizer by the PBT powders of 27KG and 330g, while putting into temperature to be heated in the revolving reaction kettle of 180 degree, make PBT powders melt to molten, and the rotary speed of revolving reaction kettle is 60 rpms；
Step 4, the PBT of molten is incubated 1 hour in the revolving reaction kettle of 180 degree, the rotary speed of revolving reaction kettle is 55 rpms；
Step 5, the temperature of revolving reaction kettle is promoted in 205 degree of revolving reaction kettle and is incubated 1.7 hours, then will be incubated 2 hours in the revolving reaction kettle of the greenhouse cooling of revolving reaction kettle to 180 degree, the rotary speed of revolving reaction kettle is 46 rpms；
Step 6, repeat step five operation it is secondary；
Step 7, the PBT of the molten that will be obtained in step 6 are extruded by extruder, obtain finished product.
The PBT that is obtained by above operation modified finished product, its anti-wear performance and bending modulus obtain huge lifting, and anti-wear performance is polished by the way that PBT finished products are placed on the emery wheel of rotation at a high speed, sees if there is adhesive chip, as shown in the table
| Finished product | Embodiment one | Embodiment two | Embodiment three | Example IV | Embodiment five |
| Bending modulus unit（Mpa） | 2700 | 2900 | 2400 | 2530 | 2600 |
| Anti-wear performance | Without adhesion | Without adhesion | Without adhesion | Without adhesion | Without adhesion |
By the process step of the invention, the bending modulus of PBT plastic is exceeded the 50% of like product performance, while in grinding, PBT plastic chip directly flies out, and will not be sticked together with PBT plastic.
The present invention needs the air pressure in strict control revolving reaction kettle,Typically the air pressure in revolving reaction kettle is set to be placed in negative pressure state,Scope is -1 to -0.9Mpa,If negative pressure will cause reaction insufficient less than -0.9Mpa,PBT cannot occur chemical modification in revolving reaction kettle,If negative pressure is more than -1Mpa,PBT will be caused insufficient with the reaction of heat stabilizer,Bending modulus is caused to decline,Temperature in a kettle. is higher than 220 degree simultaneously,The softening that PBT will be caused to expect,The degradation for causing PBT to expect,When temperature in simultaneous reactions kettle is less than 170 degree,PBT material do not react,While after the time of heat-insulation pressure keeping is greatly more than 8 hours,PBT will be caused to expect to be dissolved with heat stabilizer,Final finished is set to turn into waste material,The heat-insulation pressure keeping time was less than 6 hours simultaneously,PBT will be caused to expect insufficient with the reaction of heat stabilizer,The bending modulus of final finished will be caused to decline；PBT material are ground into powder in step one simultaneously, PBT is facilitated to expect to mix with heat stabilizer, the granular size of powder must be consistent simultaneously, if the inconsistent mechanical property that will cause PBT particles of granular size is inconsistent, there is the requisite quality of some particles, the quality dissatisfaction of some particles, the Quality Down of the final finished product for being made PBT particles, the granular size of powder is between 5 ~ 20 μm, if less than 5 μm, it is easy to cause the dust explosion in factory building, while mixed effect and bad, if greater than 20 μm, its undercompounding with heat stabilizer；Simultaneously, PBT powders are relevant with the rotating speed of revolving reaction kettle with being sufficiently mixed for heat stabilizer, in step three and four, due to just starting to mix and melting, rotating speed will comparatively fast accelerate mixing, in step 5, revolving reaction kettle has primarily served the effect for carrying out further reaction, due in step three and four, have been completed being sufficiently mixed for PBT powders and heat stabilizer, therefore the rotating speed in step 5 is relatively low, the effect for preventing heat stabilizer from precipitating, enhancing effect have been primarily served；The melting charge in step 5 to PBT is heated repeatedly simultaneously, when temperature is in low spot, the intermolecular adhesion of PBT plastic is deteriorated, conveniently carry out rotation mixing, when being incubated at high temperature simultaneously, the intermolecular adhesion of PBT plastic becomes strong, make the molecules align of PBT plastic even closer, strengthen the bonding strength of PBT plastic, improve the bending modulus of PBT plastic, it is incubated by the heating and heat preservation in repeat step five and cooling, the tight ness rating of raising PBT plastic molecules align that can be multiple, so that the bending modulus of final PBT plastic is more than 2600Pa.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-described embodiment, and all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of enhancing PBT is counter-bending and the technique of grinding performance, it is characterised in that：
Step one, by PBT raw mills into PBT powders；
Step 2, will PBT powders put into powder screening machine in screen, filter out the PBT powders of 5 ~ 20 μm of particle diameter；
Step 3, PBT powders and heat stabilizer are put into temperature simultaneously to be heated in the revolving reaction kettle of 160-180 degree, PBT powders is melted to molten, the rotary speed of revolving reaction kettle is 40 to 60 rpms；
Step 4, the PBT of molten is incubated 1 hour in the revolving reaction kettle of 160-180 degree, the rotary speed of revolving reaction kettle is 40 to 60 rpms；
Step 5, the temperature of revolving reaction kettle is promoted in the revolving reaction kettle of 200-220 degree and is incubated 1-2 hours, then 1-2 hours will be incubated in the revolving reaction kettle of the greenhouse cooling of revolving reaction kettle to 160-180 degree, the rotary speed of revolving reaction kettle is 40 to 60 rpms；
Step 6, repeat step five operation it is secondary；
Step 7, the PBT of the molten that will be obtained in step 6 are extruded by extruder, obtain finished product.
2. enhancing PBT according to claim 1 is counter-bending and the technique of grinding performance, it is characterised in that：The air pressure of the revolving reaction kettle is -1 to -0.9MPa.
3. enhancing PBT according to claim 1 is counter-bending and the technique of grinding performance, it is characterised in that：The heat stabilizer is using the one kind in zinc stearate heat stabilizer or calcium stearate heat stabilizer.
4. counter-bending and grinding performance the techniques of the enhancing PBT according to claim 1 or 3, it is characterised in that：The heat stabilizer weight is the 0.6%-2% of material gross weight.
5. enhancing PBT according to claim 1 is counter-bending and the technique of grinding performance, it is characterised in that：Revolving reaction kettle temperature degree in the step 3 is 169 degree.
6. enhancing PBT according to claim 1 is counter-bending and the technique of grinding performance, it is characterised in that：The rotating speed of the revolving reaction kettle is 42 rpms.
7. enhancing PBT according to claim 1 is counter-bending and the technique of grinding performance, it is characterised in that：Soaking time in the step 5 is 1.5 hours.
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