CN102492063B - Method for preparing chain-terminal chlorinated polyethylene wax by using thermal degradation of ferric chloride - Google Patents
Method for preparing chain-terminal chlorinated polyethylene wax by using thermal degradation of ferric chloride Download PDFInfo
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- CN102492063B CN102492063B CN2011103807589A CN201110380758A CN102492063B CN 102492063 B CN102492063 B CN 102492063B CN 2011103807589 A CN2011103807589 A CN 2011103807589A CN 201110380758 A CN201110380758 A CN 201110380758A CN 102492063 B CN102492063 B CN 102492063B
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Abstract
The invention discloses a method for preparing chain-terminal chlorinated polyethylene wax by using the thermal degradation of ferric chloride, comprising the following steps: mixing anhydrous ferric chloride with polyethylene pellets uniformly according to a weight ratio of 1:50-100 to form a mixture, then adding the mixture in a high pressure reaction vessel, and then letting in nitrogen and raising the pressure to 0.3-0.5 Mpa, then heating up to 200-210 DEG C, and starting to stir and controlling the stirring speed to 50-80 rpm; continuously heating to 330-380 DEG C and then keeping a constant temperature, reacting for 1-6 h under a pressure of lower than 1 Mpa, stopping stirring when the temperature is reduced to 190-200 DEG C, tanking out molten materials when the temperature is reduced to 160-180 DEG C, cooling in the air to room temperature, and crushing to obtain a product. The method belongs to a one-step anoxic thermal degradation technology, thus the preparation of the chain-terminal chlorinated polyethylene wax can be prepared in one step, the operation is simple, the reaction period is short, the cost is low, and the whole reaction process discharges no noxious material. The method has the advantage of environmental protection.
Description
Technical field
The invention belongs to chlorinatedpolyethylene wax preparing technical field, be specifically related to a kind of preparation method of low chlorine content polyethylene wax, particularly a kind of method with preparing chain-terminal chlorinated polyethylene wax by using thermal degradation of ferric chloride.
Background technology
Polyethylene wax and paraffin phase ratio, except be not from the mineral oil such as oil, directly extract and molecular weight usually slightly greatly, its molecular structure and characteristic of property and paraffin phase are seemingly, all have the advantages such as good winter hardiness, thermotolerance, chemical resistant properties and wear resistance, therefore also usually be applied to the industries such as chemical industry, light industry, food.
At present, except from the by product of synthesizing polyethylene, obtaining the polyethylene wax, mainly be to make polyethylene wax through the polyethylene thermal destruction, though it is short that the method has technical process, equipment is simple, reaction pressure is lower and be easy to the advantages such as control, the method that disclosed a kind of thermal destruction prepares polyethylene wax such as Chinese patent CN1250788A is exactly in the reactor that cools back receiving apparatus waste polyethylene to be warming up to about 430 ℃, by the time stopped heating and cooling when distillate reaches 5%, product is the polyethylene wax of chain hydrocarbon form in the still, but because the molecular chain polarity of the polyethylene wax that obtains is little, non-activity functional group, it is of limited application.Polyethylene wax is carried out chemical modification etc. then may obtain the wider modified polyethylene wax of range of application.As by chlorination modified in polyethylene wax, introduce polarity carbon chlorine key after, make it be more suitable for being applied to polar material except can increasing its molecular chain polarity, also can carry out further chemical reaction with other compound and produce the product that contains special groups or special construction because having introduced active function groups.
Regrettably, specifically for the chlorination modified report that has no of polyethylene wax, what can see is and the similar chlorination of paraffins modification of polyethylene wax, these chlorination modified chlorine or liquid chlorines of normally adopting carry out, concrete grammar has chloride solution, suspension chlorination method and chlorination by solid state method etc., and the clorafin that makes after the chlorination of paraffin class material, often with how much the naming of cl content, the major industry kind has chlorine wax-42, chlorine wax-52, chlorinated paraffin-70 etc.Disclose a kind of preparation method of chlorinated paraffin-70 such as Chinese patent 03139261.X, the method is take liquid chlorine and solid paraffin as raw material, and after mixing in reactor, a minute three phases replaces chain reaction and obtains clorafin.But the product cl content that these methods make is larger; more, the distribution of the quantity of chlorine atom and position are uncontrollable on the molecular chain; thereby make and be difficult to keep sufficiently long nonpolar segment on the molecular chain; both can not becoming, polar functionalities also has the product of growing nonpolar segment; therefore can only be as the extender plasticizer of polyvinyl chloride and rubber item, fire retardant, lubricating oil additive, leather fat etc.; and the ageing-resistant performance of product and resistance to low temperature are all relatively poor, usually also with certain color and luster.In addition, also there is complex procedures in its technique preparation process, and the formed dilute hydrochloric acid by-product recovery of absorbing hydrogen chloride is utilized difficulty, and wastewater discharge is large, and equipment corrosion is serious, and reaction heat is derived the problems such as difficulty.
Summary of the invention
The objective of the invention is the problem for prior art, a kind of method with preparing chain-terminal chlorinated polyethylene wax by using thermal degradation of ferric chloride is provided.
A kind of method with preparing chain-terminal chlorinated polyethylene wax by using thermal degradation of ferric chloride provided by the invention, processing step and the condition of the method are as follows:
1) in mass ratio 1: 50～100 with adding behind Anhydrous Ferric Chloride and the polyethylene pellet mixing in the autoclave, after then passing into nitrogen and making the autoclave internal pressure rise to 0.3～0.5MPa, closes nitrogen valve;
2) temperature in the autoclave is risen to 200～210 ℃, then opening stirring and controlling stir speed (S.S.) is 50～80rpm;
3) continue to be warming up to 330～380 ℃ after constant temperature, and keep the still internal pressure and below 1Mpa, react 1～6h, stopped heating;
4) be down to 190～200 ℃ when temperature in the kettle and stop to stir, continue to treat that temperature in the kettle is down to 160～180 ℃, open reactor after opening vent valve, take out melt shape thing, pulverize to get product after in air, being down to room temperature.
The weight-average molecular weight of the polyethylene pellet described in the aforesaid method is 10～800,000.
Polyethylene pellet described in the aforesaid method is industrial polyethylene or waste polyethylene reclaimed materials.
The present invention compared with prior art has following positively effect:
1, because method provided by the invention is a kind of technique of utilizing Anhydrous Ferric Chloride and the thermal destruction of polyethylene body anaerobic, by the long-chain free radical that produces of the chain rupture end-blocking that is coupled timely progressively in the chlorine atom radical pair polyethylene degradation process, what obtain at last is that one or both ends are with lower molecular weight (number-average molecular weight is 500～6000) polyethylene wax of chlorine atom, thereby make not only cl content lower (2～5%) of the product that obtains, the chlorine atom site is controlled, and the chlorine atom that the end of the chain is introduced both can be used as the polarity that polar group improves the chain hydrocarbon product, improve the affinity of itself and polar material, also can provide preferably reactive behavior, to be transformed into other active functional group groups by easy replacement(metathesis)reaction, give product more physics and chemistry function, as as special tensio-active agent, the macromolecular material compatilizer, plastic working and modified additive, and be used for the novel materials such as segmented copolymer that chain extension prepares the special chain structure.
2, because method provided by the invention is the limit thermal destruction, limit coupling end-blocking, thereby the mode that not only can finish in a step prepares the low chlorine content polyethylene wax, operation is simple, cycle is short, and cost is low, and whole reaction process is because being in air-tight state, almost unharmful substance discharging is a kind of novel method of preparation chlorinatedpolyethylene wax of environmental protection.
3, because the Anhydrous Ferric Chloride that uses in the method provided by the invention is directly taken from industrialization product, and low price, need not to carry out any processing before using, and at high temperature discharge without any toxic substance, thereby products therefrom is nontoxic, non-corrosiveness.
4, owing to employed polyethylene in the method provided by the invention both industrial polyethylene, also can be the waste polyethylene plastics that reclaim, thereby not only raw material sources are extensive, and can reduce cost, take full advantage of resource, for a new way is opened up in the recycling of waste polyethylene plastics.
5, because being a kind of method of the chlorination while degrade, method provided by the invention prepares the polyethylene wax of low chlorine content, and the dischargings such as no coupling product generation and waste water, the problems such as equipment corrosion, thereby the method equipment used is easy, Production Flow Chart is short, easy handling, and cost is low.
Description of drawings
Accompanying drawing is not for adding Anhydrous Ferric Chloride and being added with the reaction system of Anhydrous Ferric Chloride respectively under 350 ℃ of temperature, the control degradation time is 2h, the products therefrom xylene soluble, the acidic aqueous solution that adds boiling, tell lower layer of water liquid, surplus solution uses alcohol extraction, the infrared spectrum of gained sample after the vacuum-drying.C0 is not for adding the spectrogram of anhydrous chlorides of rase iron sample among the figure; C1 is that the mass ratio of Anhydrous Ferric Chloride/HDPE is the spectrogram of 1: 100 sample; C2 is that the mass ratio of Anhydrous Ferric Chloride/HDPE is the spectrogram of 1: 50 sample.
From scheming as seen, though do not add the spectrogram C0 of Anhydrous Ferric Chloride DeR gained sample and added spectrogram C1, the C2 of Anhydrous Ferric Chloride DeR gained sample all at 2919.37cm
-1, 2849.98cm
-1, 1468.42cm
-1And 721.41cm
-1There is the charateristic avsorption band of obvious polyethylene wax methyl and methylene radical at the place, but only has spectrogram C1, C2 stretching vibration charateristic avsorption band and the 1260.89cm of obvious C-Cl just to occur in the 802.83cm-1 vicinity
-1, 1096.76cm
-1And 1021.78cm
-1The obvious peak value at place can be judged the existence that the chlorine element is arranged in the product thus.
The specific embodiment mode
The below provides embodiment so that the present invention will be described in more detail; it is important to point out that following examples can not be interpreted as limiting the scope of the invention, the person skilled in the art in this field still belongs to protection scope of the present invention according to the invention described above content to some nonessential improvement and the adjustment that the present invention makes.
What deserves to be explained is, the used umber of following examples reaction mass is mass parts.
Embodiment 1
Be to add in the autoclave behind 170,000 industrial pellets of high density polyethylene and 2 parts of Anhydrous Ferric Chloride mixings with 200 parts of weight-average molecular weight, after then passing into nitrogen and making the autoclave internal pressure rise to 0.5MPa, close nitrogen valve; Open after temperature in the autoclave risen to 200 ℃ and stir and the control stir speed (S.S.) is 50rpm, constant temperature after continuing to be warming up to 330 ℃, and keep still internal pressure stopped heating behind (if pressure surpasses 1Mpa, the air valve that can gently begin to rehearse decompression) reaction 2h below 1Mpa; Treat that temperature in the kettle is down to 190 ℃ and stops to stir, treat that temperature in the kettle is down to 160 ℃ again, open reactor after opening vent valve, take out melt shape thing, in air, be down to pulverize after the room temperature and obtain product.
Embodiment 2
Be to add in the autoclave behind 300,000 industrial pellets of high density polyethylene and 2 parts of Anhydrous Ferric Chloride mixings with 200 parts of weight-average molecular weight, after then passing into nitrogen and making the autoclave internal pressure rise to 0.4MPa, close nitrogen valve; Open after temperature in the autoclave risen to 205 ℃ and stir and the control stir speed (S.S.) is 60rpm, constant temperature after continuing to be warming up to 350 ℃, and keep still internal pressure stopped heating behind (if pressure surpasses 1Mpa, the air valve that can gently begin to rehearse decompression) reaction 2h below 1Mpa; Treat that temperature in the kettle is down to 195 ℃ and stops to stir, treat that temperature in the kettle is down to 170 ℃ again, open reactor after opening vent valve, take out melt shape thing, in air, be down to pulverize after the room temperature and obtain product.
Embodiment 3
Be to add in the autoclave behind 300,000 industrial pellets of high density polyethylene and 3 parts of Anhydrous Ferric Chloride mixings with 200 parts of weight-average molecular weight, after then passing into nitrogen and making the autoclave internal pressure rise to 0.4MPa, close nitrogen valve; Open after temperature in the autoclave risen to 205 ℃ and stir and the control stir speed (S.S.) is 60rpm, constant temperature after continuing to be warming up to 350 ℃, and keep still internal pressure stopped heating behind (if pressure surpasses 1Mpa, the air valve that can gently begin to rehearse decompression) reaction 4h below 1Mpa; Treat that temperature in the kettle is down to 195 ℃ and stops to stir, treat that temperature in the kettle is down to 170 ℃ again, open reactor after opening vent valve, take out melt shape thing, in air, be down to pulverize after the room temperature and obtain product.
Embodiment 4
Be to add in the autoclave behind 100,000 industrial Low Density Polyethylene pellet and 3 parts of Anhydrous Ferric Chloride mixings with 200 parts of weight-average molecular weight, after then passing into nitrogen and making the autoclave internal pressure rise to 0.5MPa, close nitrogen valve; Open after temperature in the autoclave risen to 200 ℃ and stir and the control stir speed (S.S.) is 50rpm, constant temperature after continuing to be warming up to 330 ℃, and keep still internal pressure stopped heating behind (if pressure surpasses 1Mpa, the air valve that can gently begin to rehearse decompression) reaction 1h below 1Mpa; Treat that temperature in the kettle is down to 190 ℃ and stops to stir, treat that temperature in the kettle is down to 160 ℃ again, open reactor after opening vent valve, take out melt shape thing, in air, be down to pulverize after the room temperature and obtain product.
Embodiment 5
Be to add in the autoclave behind 300,000 industrial pellets of high density polyethylene and 4 parts of Anhydrous Ferric Chloride mixings with 200 parts of weight-average molecular weight, after then passing into nitrogen and making the autoclave internal pressure rise to 0.4MPa, close nitrogen valve; Open after temperature in the autoclave risen to 208 ℃ and stir and the control stir speed (S.S.) is 60rpm, constant temperature after continuing to be warming up to 350 ℃, and keep still internal pressure stopped heating behind (if pressure surpasses 1Mpa, the air valve that can gently begin to rehearse decompression) reaction 2h below 1Mpa; Treat that temperature in the kettle is down to 198 ℃ and stops to stir, treat that temperature in the kettle is down to 175 ℃ again, open reactor after opening vent valve, take out melt shape thing, in air, be down to pulverize after the room temperature and obtain product.
Embodiment 6
Be to add in the autoclave behind 300,000 waste polyethylene reclaimed materials and 4 parts of Anhydrous Ferric Chloride mixings with 200 parts of weight-average molecular weight, after then passing into nitrogen and making the autoclave internal pressure rise to 0.4MPa, close nitrogen valve; Open after temperature in the autoclave risen to 200 ℃ and stir and the control stir speed (S.S.) is 60rpm, constant temperature after continuing to be warming up to 350 ℃, and keep still internal pressure stopped heating behind (if pressure surpasses 1Mpa, the air valve that can gently begin to rehearse decompression) reaction 4h below 1Mpa; Treat that temperature in the kettle is down to 195 ℃ and stops to stir, treat that temperature in the kettle is down to 170 ℃ again, open reactor after opening vent valve, take out melt shape thing, in air, be down to pulverize after the room temperature and obtain product.
Embodiment 7
Be to add in the autoclave behind 800,000 industrial pellets of high density polyethylene and 4 parts of Anhydrous Ferric Chloride mixings with 200 parts of weight-average molecular weight, after then passing into nitrogen and making the autoclave internal pressure rise to 0.3MPa, close nitrogen valve; Open after temperature in the autoclave risen to 210 ℃ and stir and the control stir speed (S.S.) is 80rpm, constant temperature after continuing to be warming up to 380 ℃, and keep still internal pressure stopped heating behind (if pressure surpasses 1Mpa, the air valve that can gently begin to rehearse decompression) reaction 6h below 1Mpa; Treat that temperature in the kettle is down to 200 ℃ and stops to stir, treat that temperature in the kettle is down to 180 ℃ again, open reactor after opening vent valve, take out melt shape thing, in air, be down to pulverize after the room temperature and obtain product.
Claims (3)
1. method with preparing chain-terminal chlorinated polyethylene wax by using thermal degradation of ferric chloride, processing step and the condition of the method are as follows:
1) 1:50 ~ 100 add in the autoclave after with Anhydrous Ferric Chloride and polyethylene pellet mixing in mass ratio, after then passing into nitrogen and making the autoclave internal pressure rise to 0.3 ~ 0.5MPa, close nitrogen valve;
2) temperature in the autoclave is risen to 200 ~ 210 ℃, then opening stirring and controlling stir speed (S.S.) is 50 ~ 80rpm;
3) continue to be warming up to 330 ~ 380 ℃ after constant temperature, and keep the still internal pressure and below 1MPa, react 1 ~ 6h, stopped heating;
4) be down to 190 ~ 200 ℃ when temperature in the kettle and stop to stir, continue to treat that temperature in the kettle is down to 160 ~ 180 ℃, open reactor after opening vent valve, take out melt shape thing, pulverize to get product after in air, being down to room temperature.
2. the method with preparing chain-terminal chlorinated polyethylene wax by using thermal degradation of ferric chloride according to claim 1, the weight-average molecular weight of the polyethylene pellet described in the method is 10 ~ 800,000.
3. the method with preparing chain-terminal chlorinated polyethylene wax by using thermal degradation of ferric chloride according to claim 1 and 2, the polyethylene pellet described in the method is industrial polyethylene or waste polyethylene reclaimed materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103807589A CN102492063B (en) | 2011-11-25 | 2011-11-25 | Method for preparing chain-terminal chlorinated polyethylene wax by using thermal degradation of ferric chloride |
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| CN2011103807589A CN102492063B (en) | 2011-11-25 | 2011-11-25 | Method for preparing chain-terminal chlorinated polyethylene wax by using thermal degradation of ferric chloride |
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| CN102492063B true CN102492063B (en) | 2013-01-23 |
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| CN105505532B (en) * | 2015-11-30 | 2018-05-25 | 江阴市苏达塑业有限公司 | A kind of die material lubricated granules and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3997624A (en) * | 1975-10-01 | 1976-12-14 | Princeton Polymer Laboratories, Incorporated | Polyethylene waxes |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3997624A (en) * | 1975-10-01 | 1976-12-14 | Princeton Polymer Laboratories, Incorporated | Polyethylene waxes |
Non-Patent Citations (4)
| Title |
|---|
| 废旧聚乙烯催化降解制备聚乙烯蜡;张建雨等;《塑料科技》;20100930;第38卷(第9期);51-54 * |
| 废聚乙烯塑料制氧化聚乙烯蜡的研究;王莹等;《北京石油化工学院学报》;20060630;第14卷(第2期);6-10 * |
| 张建雨等.废旧聚乙烯催化降解制备聚乙烯蜡.《塑料科技》.2010,第38卷(第9期),51-54. |
| 王莹等.废聚乙烯塑料制氧化聚乙烯蜡的研究.《北京石油化工学院学报》.2006,第14卷(第2期),6-10. |
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