CN105585766A - Low density polyethylene resin for medicinal film and preparation method thereof - Google Patents
Low density polyethylene resin for medicinal film and preparation method thereof Download PDFInfo
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- CN105585766A CN105585766A CN201410557448.3A CN201410557448A CN105585766A CN 105585766 A CN105585766 A CN 105585766A CN 201410557448 A CN201410557448 A CN 201410557448A CN 105585766 A CN105585766 A CN 105585766A
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- polyethylene resin
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- density polyethylene
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Abstract
The invention discloses low density polyethylene resin for manufacturing high-transparency films and a preparation method thereof. Number-average molecular weight of the polyethylene resin is 10-20 thousands; molecular weight distribution index is 4-6; haze range is 4-9%; and melt flow rate at 190 DEG C and under the weight condition of 2.16 kg is 1.0-5.0 g/10 min. According to the invention, ethene used as a raw material and air and organic peroxide which are used as mixed initiators undergo a polymerization reaction; by adjusting ratio of 1-butylene to propionaldehyde, a polyethylene raw material product is obtained; the polyethylene raw material product and master batch obtained after mixing and dry granulation of an antioxidant and an anti-blocking agent are mixed, and extrusion pelletization is carried out so as to obtain the low density polyethylene resin specially for manufacturing high-transparency films. The preparation method of the invention is simple. The low density polyethylene resin obtained by the method has appropriate melt fluidity and low hexane extract, and can meet sanitary requirements, processing requirements and mechanical property requirements of the medicinal films.
Description
Technical field
The invention belongs to macromolecule manufacturing technology field, be specifically related to a kind of medicinal film ldpe resin andPreparation method.
Background technology
Low density polyethylene (LDPE) (LDPE) is application one of product more widely in polyolefin, because it has good processingProperty, preferably flexibility and the transparency and lustrous surface etc. and gain great popularity, particularly at packaging industry and require filmThe field that transparency is higher, ldpe film is one of best selection, therefore at home and abroad, LDPE still occupies in a large numberFilm market. Along with people are more and more higher to the requirement of product quality, to the hygienic requirements of ldpe film also more and moreIt is more low better that height, particularly n-hexane extract require.
Summary of the invention
In order to overcome the deficiencies in the prior art, the object of this invention is to provide a kind of low-density for the manufacture of medicinal film poly-Vinyl and preparation method, this process for preparing resins is simple, and the resin obtaining has good processing characteristics, opticsPerformance, mechanical property, sanitation performance, and there is excellent additive system, production that can fulfilling medicinal film and makingWith requiring.
The present invention is achieved through the following technical solutions.
The invention provides a kind of medicinal film ldpe resin, this resin number-average molecular weight is 1～20,000, moleculeAmount profile exponent be 4～6, mist degree scope is 4%～9%, n-hexane extract is 0.5～2g/100g, 190 DEG C,Melt flow rate (MFR) under 2.16kg counterweight pressure is 1.0～5.0g/10min.
Above-mentioned medicinal film ldpe resin, the composition that contains following mass percent:
Polyethylene: 95～99.93%
1-butylene: 0～2%
Propionic aldehyde: 0～2%
Antioxidant 1010: 0.05～0.5%
Organic peroxide: 0.01～0.5%
Opening agent: 0.01～2%.
Above-mentioned organic peroxide is TX25 or TBPV, and described opening agent is the mixture of oleamide and calcium sulfate, withWeight ratio meter, oleamide: calcium sulfate=1:(0.5～1.5), this opening agent can effectively prevent medicinal film articleBe sticked together in process of production, avoid opening difficulty. .
The present invention also provides a kind of preparation method of medicinal film ldpe resin, and concrete steps are as follows:
(1) ethene that in fresh ethylene and reactor, unreacted is recycled boosts to through leading portion, back segment compressor250-300MPa, then be warmed up to after 170-190 DEG C through preheater, enter reactor, in reactor, adopt air and haveMachine peroxide carries out polymerisation as mixed initiator, in polymerization process, regulates adjusting agent 1-butylene and propionic aldehyde to joinRatio, separates and obtains polyethylene raw produce through high and low pressure goods separator, and unreacted ethylene gas returns to weight of compressorNewly recycle;
(2) master batch that isolated polyethylene raw produce obtains with antioxidant, opening agent mixing non-slurry pelletizing enters after mixingExtruder carries out extruding pelletization, obtains being exclusively used in the ldpe resin that high transparent membrane is manufactured.
The present invention compared with prior art has the following advantages:
Ldpe resin of the present invention, by regulating adjusting agent 1-butylene and propionic aldehyde proportioning, makes it have suitable meltingLiquid flowability and lower n-hexane extract, hygienic requirements, processing request and mechanical property that can fulfilling medicinal filmCan requirement.
Brief description of the drawings
Fig. 1 is the flow chart of production technology of the present invention.
Detailed description of the invention
Embodiment (1-6)
Regulate adjusting agent 1-butylene and propionic aldehyde proportioning, obtain polyethylene raw material; Above-mentioned antioxidant, opening agent are mixedNon-slurry pelletizing obtains master batch, is conveyed into polyethylene raw material by masterbatch extruder, enters extruder and extrude and make after mixingGrain, sends into the degassed mixing of feed bin storage tank, then sends finished product packing after granulation, obtain being exclusively used in the low close of medicinal thin film fabricationDegree polyvinyl resin; Concrete technology parameter is: reaction pressure keeps 2700-2800kg/cm2, polymeric reaction temperature 300-340DEG C, suitably adjust the ethene amount of returning, control product density between 0.9100-0.9300g/cm3, control product melting and refer toNumber is under 2.16kg counterweight pressure within the scope of 1.0-5.0g/10min; 1-butylene and propionic aldehyde proportioning are specially: 1-butylene 0～2wt%, propionic aldehyde 0～2wt%; Degree of regulation is 0.05%. Process chart is shown in Fig. 1. 1-butylene and propionic aldehyde proportioning are in Table1, antioxidant 0.1% peroxide (TX25 or TBPV): 0.1%, opening agent (oleamide: calcium sulfate=1:1)0.1%, obtain the physicochemical property of ldpe resin of medicinal film in table 2.
Table 1 embodiment proportioning
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | |
| 1-butylene wt% | 0 | 0.2 | 0.4 | 0.6 | 0.8 | 1 |
| Propionic aldehyde wt% | 1 | 0.8 | 0.6 | 0.4 | 0.2 | 0 |
Table 2 is exclusively used in the physicochemical property of the ldpe resin of medicinal film
The present invention can summarize with other the concrete form without prejudice to spirit of the present invention or principal character. Of the present invention above-mentionedEmbodiment can only think explanation of the present invention instead of restriction, and every foundation essence technology of the present invention is to above realityExecute trickle amendment, equivalent variations and modification that example is done, all belong in the scope of technical solution of the present invention.
Claims (4)
1. a medicinal film ldpe resin, is characterized in that: this resin number-average molecular weight is 1～20,000, pointSon amount profile exponent is 4～6, and mist degree scope is 4%～9%, and n-hexane extract is 0.5～2g/100g, 190 DEG C,Melt flow rate (MFR) under 2.16kg counterweight pressure is 1.0～5.0g/10min.
2. medicinal film ldpe resin according to claim 1, is characterized in that: contain following qualityThe composition of percentage:
Polyethylene: 95～99.93%
1-butylene: 0～2%
Propionic aldehyde: 0～2%
Antioxidant 1010: 0.05～0.5%
Organic peroxide: 0.01～0.5%
Opening agent: 0.01～2%.
3. medicinal film ldpe resin according to claim 1 and 2, is characterized in that: described organic mistakeOxide is TX25 or TBPV, and described opening agent is the mixture of oleamide and calcium sulfate, in weight ratio, and oilAcid acid amides: calcium sulfate=1:(0.5～1.5).
4. the preparation method of ldpe resin for medicinal film according to claim 1 and 2, is characterized in that,Concrete steps are as follows:
(1) ethene that in fresh ethylene and reactor, unreacted is recycled boosts to through leading portion, back segment compressor250-300MPa, then be warmed up to after 170-190 DEG C through preheater, enter reactor, in reactor, adopt air and haveMachine peroxide carries out polymerisation as mixed initiator, in polymerization process, regulates adjusting agent 1-butylene and propionic aldehyde to joinRatio, separates and obtains polyethylene raw produce through high and low pressure goods separator, and unreacted ethylene gas returns to weight of compressorNewly recycle;
(2) master batch that isolated polyethylene raw produce obtains with antioxidant, opening agent mixing non-slurry pelletizing enters after mixingExtruder carries out extruding pelletization, obtains being exclusively used in the ldpe resin that high transparent membrane is manufactured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410557448.3A CN105585766A (en) | 2014-10-20 | 2014-10-20 | Low density polyethylene resin for medicinal film and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410557448.3A CN105585766A (en) | 2014-10-20 | 2014-10-20 | Low density polyethylene resin for medicinal film and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105585766A true CN105585766A (en) | 2016-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410557448.3A Pending CN105585766A (en) | 2014-10-20 | 2014-10-20 | Low density polyethylene resin for medicinal film and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106397939A (en) * | 2016-10-21 | 2017-02-15 | 中国石油化工股份有限公司 | Polyethylene material for blow molding, and preparation method thereof |
| CN108117683A (en) * | 2018-01-13 | 2018-06-05 | 石家庄育才药用包装材料股份有限公司 | A kind of low medicinal plastic packaging bag of nonyl phenol content |
| CN109771722A (en) * | 2019-01-22 | 2019-05-21 | 西安乐析医疗科技有限公司 | A kind of novel peritoneum dialysis tubing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1787876A (en) * | 2003-06-04 | 2006-06-14 | 埃克森美孚化学专利公司 | Tubular polymerization reactors and polymerization process using same |
| CN101094872A (en) * | 2004-12-29 | 2007-12-26 | 埃克森美孚化学专利公司 | Tubular polymerization reactors and polymers made therein |
| CN102762609A (en) * | 2009-12-18 | 2012-10-31 | 陶氏环球技术有限责任公司 | Polymerization process to make low density polyethylene |
| CN103237819A (en) * | 2010-09-30 | 2013-08-07 | 陶氏环球技术有限责任公司 | Polymerization process to make low density polyethylene |
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2014
- 2014-10-20 CN CN201410557448.3A patent/CN105585766A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1787876A (en) * | 2003-06-04 | 2006-06-14 | 埃克森美孚化学专利公司 | Tubular polymerization reactors and polymerization process using same |
| CN101094872A (en) * | 2004-12-29 | 2007-12-26 | 埃克森美孚化学专利公司 | Tubular polymerization reactors and polymers made therein |
| CN102762609A (en) * | 2009-12-18 | 2012-10-31 | 陶氏环球技术有限责任公司 | Polymerization process to make low density polyethylene |
| CN103237819A (en) * | 2010-09-30 | 2013-08-07 | 陶氏环球技术有限责任公司 | Polymerization process to make low density polyethylene |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106397939A (en) * | 2016-10-21 | 2017-02-15 | 中国石油化工股份有限公司 | Polyethylene material for blow molding, and preparation method thereof |
| CN108117683A (en) * | 2018-01-13 | 2018-06-05 | 石家庄育才药用包装材料股份有限公司 | A kind of low medicinal plastic packaging bag of nonyl phenol content |
| CN109771722A (en) * | 2019-01-22 | 2019-05-21 | 西安乐析医疗科技有限公司 | A kind of novel peritoneum dialysis tubing |
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Application publication date: 20160518 |
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