CN107746492A - Antioxidant master batch and its application in PEX pipes are prepared - Google Patents
Antioxidant master batch and its application in PEX pipes are prepared Download PDFInfo
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- CN107746492A CN107746492A CN201710984630.0A CN201710984630A CN107746492A CN 107746492 A CN107746492 A CN 107746492A CN 201710984630 A CN201710984630 A CN 201710984630A CN 107746492 A CN107746492 A CN 107746492A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
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Abstract
The present invention provides a kind of antioxidant master batch and its application in PEX pipes are prepared, and antioxidant master batch of the invention, is made using each component including following parts by weight：100 parts of high density polyethylene (HDPE), 0.1 4 parts of peroxide, 04 parts of assistant crosslinking agent, and parts by weight are more than 0 and the antioxidant less than or equal to 10 parts.Its production efficiency can be effectively improved by preparing PEX a pipes using the antioxidant master batch of the present invention.
Description
Technical field
The present invention relates to PEX tubing preparing technical fields, more particularly to a kind of antioxidant master batch and preparation method thereof, and
Application of the antioxidant master batch in PEX pipes are prepared.
Background technology
Crosslinked polyethylene (crosslinked Polyethylene, PEX) contains chemical key connection macromolecular chain, and is formed
Network-like structure, so as to significantly improve a series of things such as the heat-resisting, wear-resisting of material, chemical-resistant and resisting environmental stress and cracking
Rationality energy.Therefore crosslinked polyethylene pipe is widely used in floor heating pipe, and floor heating design is 50 years using the term of validity of tubing.It is this
Floor heating pipe generally introduces antioxidant component to lift the long-term use of tubing in process of production because its validity period is longer
Performance.There is antioxidant during long-term use on PEX floor heating pipes in recent years and its catabolite migrates the report into water
Gradually increase in road.Although research also indicates that base material is crosslinked, the migration of antioxidant and its catabolite can not be prevented.
On the migration problem of antioxidant during PEX pipe long-term uses, there has been no effective solution.But with
The improvement of people's living standards, the concern for environment and health problem, solves antioxidant of the PEX pipes during long-term use
One of the problem of migration problem is urgent need to resolve.
For the migration problem of antioxidant, many researchers propose to use reactive antioxidant.Such as Chinese patent application
CN102702661A proposes to lift the long-term of polypropylene compatilizer using the hindered phenol containing double bond and suffocated amine antioxidant
Thermo-oxidative stability, the addition of reactive antioxidant is larger in the patent application；And although polyfunctional monomer is which introduced, instead
The grafting rate of answering property antioxidant is still relatively low, causes its dosage to increase.
Aston universities of Britain are directed to the migration expansion research of antioxidant in PEX pipes, under study for action it is also proposed that using reactivity
Antioxidant, but capturing behavior be present to free radical with unsaturated bond Hinered phenols antioxidant, cause grafting efficiency reduce and
Auto polymerization is obvious.It is well known that PEX pipes are divided into PEX-a (peroxide crosslinking), PEX-b (silicon according to the difference of production technology
Oxygen alkane be crosslinked), PEX-c (cross-linking radiation).And PEX-a pipes therein, because it is not 100% crosslinking, non-crosslinked areas be present,
Compared to the antioxidant of cross-linked areas grafting, the influence that this part antioxidant is vulnerable to environment during long-term use is decomposed
And separate out catabolite.Additionally due to the content of reactive antioxidant and peroxide reduces, its in process scattered
Problem also influences its final grafting rate and in the substrate scattered.In addition due to it in PEX-a tubing strings plug method production process
The method for continuing to use metal forging, powder is pressed into by feed zone by plunger, is acted on by piston reciprocation and slowly extrude melt, melted
Body viscosity is big, initiator need longer time by mouth mold can be only achieved the satisfied degree of cross linking (>70%).
The content of the invention
The present invention is solution the deficiencies in the prior art, there is provided a kind of antioxidant master batch and preparation method thereof, is also carried
For the application of the antioxidant master batch in PEX pipes are prepared, further, it would be desirable to provide the side that PEX-a pipes are prepared using the antioxidant master batch
Method, its production efficiency can be effectively improved by preparing PEX-a pipes using the antioxidant master batch of the present invention.
For the present invention to reach its purpose, the technical scheme of use is as follows：
First aspect present invention provides a kind of antioxidant master batch, is made using each component including following parts by weight：It is highly dense
Spend 100 parts of polyethylene, peroxide 0.1-4 parts, assistant crosslinking agent 0-4 parts, and parts by weight and be more than 0 and the antioxygen less than or equal to 10 parts
Agent.
In more preferable scheme, the parts by weight of assistant crosslinking agent are more than 0 and less than or equal to 4 parts, are advantageous to further improve
The production efficiency and residual quantity of the antioxidant in raising product in cross-linked areas of PEX pipes are prepared using antioxidant master batch of the present invention.
As a preferred embodiment of the present invention, the antioxidant is included in reactive antioxidant and addition type antioxidant
At least one, both the reactive antioxidant and addition type the antioxidant parts by weight in antioxidant formula of master batch are preferably respectively
0-5 parts, and the parts by weight sum of the two is more than 0.In further preferred scheme, the parts by weight of assistant crosslinking agent are more than 0.
The scheme further preferred as the present invention, the antioxidant include reactive antioxidant, the reactive antioxygen
Parts by weight of the agent in antioxidant formula of master batch are preferably greater than 0 and less than or equal to 5 parts；It is further preferred that the assistant crosslinking agent
Parts by weight be more than 0；It is preferred that by assistant crosslinking agent and reactive antioxidant compounded combination, elimination reaction antioxidant particularly by
Influence of the phenolic antioxidant to the PEX-a pipe degrees of cross linking is hindered, and helps to form the 3 D cross-linked knot of partial 3 d in PEX-a is managed
Structure.Assistant crosslinking agent can connect PE macromolecular chains and reactive antioxidant, so as to which reactive antioxidant is limited into cross-linked areas, from
And lift the ability of resisting to migration of hot oxygen performances and antioxidant of the PEX-a during long-term use.
As a preferred embodiment of the present invention, the reactive antioxidant includes the hindered amines with unsaturated double-bond
Or the one or more in Hinered phenols antioxidant, it is preferred that the number-average molecular weight of the reactive antioxidant is less than 1000.Should
Preferable reactive antioxidant may participate in double bond cross-linking reaction.As a kind of example, the preferable reactive antioxidant for example may be used
To be that AOPP, DBPA, pi-allyl phenols (such as 4010NA, Norbloc7966, Clariant HALS-13 etc.) etc. have similar knot
Structure contains cross-linking double bond and at least containing the one or more in hindered phenol or hindered amines structural compounds.More preferably
In scheme, the suffocated amine antioxidant with unsaturated double-bond is contained in antioxidant master batch, being introduced in antioxidant master batch should be by
Hindered amine antioxidant, the residual quantity of the degree of cross linking and antioxidant of obtained PEX-a pipes in the substrate can be improved.It is further excellent
Suffocated amine antioxidant and assistant crosslinking agent of the addition with unsaturated double-bond in antioxidant master batch of choosing, the two synergy,
When this antioxidant master batch is applied into the preparation of PEX-a pipes, the degree of cross linking can be further improved, is crosslinked in a preferred approach
Degree can be improved to more than 90% level.
As a preferred embodiment of the present invention, the assistant crosslinking agent includes may participate in cross-linking reaction with more than three
The compound of double bond.It is preferred that this assistant crosslinking agent and reactive antioxidant are used in combination in antioxidant master batch, it is obtained
When subsequently preparing PEX-a pipes, it still has reactable double bond and participates in follow-up base assistant crosslinking agent in antioxidant master batch
The cross-linking reaction of material, the antioxidant being more grafted can be allowed to be deposited in cross-linked areas, so as to improve the long term thermal oxygen of PEX-a pipes
Performance and the ability of resistance to migration, the antioxidant retaining portion that obtained PEX-a manages after the extraction of its antioxidant graft crosslinking region can
To reach more than 90%.
Preferably, the assistant crosslinking agent includes triallyl cyanurate (TAC), iso-cyanuric acid triallyl ester
(TAIC), in trimethylol-propane trimethacrylate (TMPTMA), poly- iso-cyanuric acid triallyl ester (P-TAIC)
It is one or more of.
As a preferred embodiment of the present invention, it is 150-220 DEG C that the peroxide, which is selected from 1min half life temperatures,
Peroxide；It is preferred that the peroxide, during carrying out melt blending to each component when preparing antioxidant master batch, avoid due to
Peroxide, reaction antioxidant and/or the assistant crosslinking agent of high concentration be present and cause the cross-linking reaction in master batch production process to go out
Existing uncontrollable situation；And antioxidant master batch can also preferably be ensured in melt blending using the preferred peroxide, it is highly dense
Do not reacted between degree polyethylene and peroxide, assistant crosslinking agent and/or reactive antioxidant.Preferably, the peroxide choosing
From cumyl peroxide (DCP), di-t-butyl peroxide (DTBP), 2,5- dimethyl -2,5- di-t-butyls pentane, 2,5- bis-
One or more in methyl -2,5- di-t-butyl -3- hexins.
Described 1min half life temperatures refer to that the time that peroxide is reduced to the half of initial value in concentration is one point
Temperature during clock.
In the present invention, the addition type antioxidant is preferably the antioxygen that reaction can not be crosslinked with high density polyethylene (HDPE)
Agent；The addition type antioxidant can be commercially available universal antioxidant, for example, can be antioxidant 1076, antioxidant 1035,
One or more in antioxidant DSTDP.
Its selectable abundant raw material of high density polyethylene (HDPE) used, the alternative commodity-type in commercial channel in the present invention
It is number also a lot, such as Borealis HE1878, Basel Lupolen 5261ZQ456, LG XL1800 etc..As the present invention
In one kind preferably, the density of the high density polyethylene (HDPE) is 0.945-0.965g/cm3, melt index 1.2-9g/10min
(melt index determination counterweight weight 21.6KG), weight average molecular weight Mw=200000-500000.
Second aspect of the present invention provides a kind of preparation method of antioxidant master batch, comprises the following steps：Will be each by formula ratio
Component melts are blended, and are granulated.
It it is 120-150 DEG C preferably by the temperature control of melt blending when preparing the antioxidant master batch of the present invention.
As a kind of example, in a kind of embodiment, the concrete operations of melt blending, such as can first carry out
Stir and evenly mix, then put into single screw extrusion machine and handled again, be preferably set in the treatment temperature of single screw extrusion machine
120-150℃。
When preparing the antioxidant master batch of the present invention, preferable scheme is, before pelletizing to melt blending resulting material
It is heat-treated, the temperature of the heat treatment is preferably controlled in the range of peroxide 1min half life temperature ± 5 DEG C (at the heat
The temperature of reason can be any temperature in the temperature range), time of the heat treatment is preferably peroxide in the heat treatment
At a temperature of 0.5-5 times or 0.8-3 times of half-life.Due to during melt blending and cross-linking reaction
In exothermic reaction all be present, so as to easily cause the temperature steep temperature rise in production process, cause antioxidant master batch to be excessively crosslinked, it is excellent
Choosing, which carries out the heat treatment operation, can avoid or alleviate this situation, final to prepare using the antioxidant master batch of the present invention
During PEX pipes, it is ensured that the cross-linking reaction of system can be carried out steadily；The heat treatment operation also has preactivated to antioxidant master batch
Effect, promote the raising of subsequent production PEX tube efficiencies.
Third aspect present invention also provides the application of above-mentioned antioxidant master batch, and it can be applied in the preparation of PEX pipes, can be with
Effectively solve the scattering problem of antioxidant, and the usage amount of reactive antioxidant can be reduced.More preferably it is applied to the system of PEX-a pipes
It is standby.
The present invention also provides a kind of preparation method of PEX-a pipes, comprises the following steps：Using preparation method described above
Antioxidant master batch is prepared, antioxidant master batch is mixed with other components, extrusion molding.
The present invention is prepared in the method for PEX-a pipes, and the key of its specific PEX-a pipes composition of raw materials is to be added with this hair
Bright antioxidant master batch, other components can use the existing respective components for preparing PEX-a pipes in this area.And it is used as a kind of excellent
The embodiment of choosing, the raw material for preparing PEX-a pipes preferably include each component of following parts by weight：Parts by weight sum is 100 parts
High density polyethylene (HDPE) and antioxidant master batch, parts by weight are the peroxide of 0.1-1 parts, and the parts by weight of wherein antioxidant master batch are more than
0 and less than or equal to 15 parts.
For the present invention in the preparation method of PEX-a pipes, preparing the raw material of PEX-a pipes preferably also includes the profit of 0-1 parts by weight
Lubrication prescription.Lubricant can use the existing known lubricants in this area, as a kind of example, such as can be fatty acid amide,
One or more of mixing in stearate, Tissuemat E, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer.
The present invention in the preparation method of PEX-a pipes, the peroxide that is added, high density polyethylene (HDPE) can and antioxidant
It is identical or different in master batch, can specifically it use this area to prepare corresponding raw material known to PEX-a pipes.And it is used as a kind of preferred
Scheme, the peroxide added are the peroxide that 1min half life temperatures are 150-220 DEG C；It is it is further preferred that described
Peroxide is selected from cumyl peroxide (DCP), di-t-butyl peroxide (DTBP), 2,5- dimethyl -2,5- di-t-butyls
One or more in pentane, 2,5- dimethyl -2,5- di-t-butyl -3- hexins.As a kind of preferred scheme, the high density
The density of polyethylene is 0.945-0.965g/cm3, melt index is 1.2-9g/10min (21.6kg), weight average molecular weight Mw=
200000-500000。
For the present invention in the preparation method of PEX-a pipes, each of following parts by weight can also be included by preparing the raw material of PEX-a pipes
Component：Reactive antioxidant 0-1 parts, addition type antioxidant 0-1 parts, assistant crosslinking agent 0-1 parts, these components can be female with antioxidant
Respective components in grain are identical or different, can specifically use this area this area to prepare corresponding raw material known to PEX-a pipes.And
As a kind of preferred embodiment, the reactive antioxidant includes the hindered amines for carrying unsaturated double-bond or Hinered phenols resist
One or more in oxygen agent, it is preferred that the number-average molecular weight of the reactive antioxidant is less than 1000.As a kind of preferred real
Mode is applied, the assistant crosslinking agent includes the compound with more than three double bonds that may participate in cross-linking reaction；It is further preferred that
The assistant crosslinking agent is selected from triallyl cyanurate (TAC), iso-cyanuric acid triallyl ester (TAIC), trihydroxy methyl third
One or more in alkane trimethyl acrylic ester (TMPTMA), poly- iso-cyanuric acid triallyl ester (P-TAIC).As one
Kind preferred embodiment, the addition type antioxidant are the antioxidant that reaction can not be crosslinked with high density polyethylene (HDPE)；It is preferred that
, the addition type antioxidant is the one or more in antioxidant 1076, antioxidant 1035, antioxidant DSTDP.
, specifically can be with during extrusion molding when preparing PEX-a pipes in a kind of specific embodiment of the invention further preferred
Using plunger method, material is put into plunger-type extruder extrusion molding, it is 110-130 DEG C preferably to control feed zone temperature, connection
Duan Wendu is 140-170 DEG C, and barrel temperature is 200-220 DEG C, and die temperature is 240-260 DEG C.
Technical scheme provided by the invention has the advantages that：
The present invention prepares PEX pipes using antioxidant master batch, is advantageous to each component and disperses in PEX pipes, this method is also
PEX production efficiency can be improved.
PEX-a pipes are prepared using the antioxidant master batch of the present invention, not only each component can preferably disperse, and production efficiency
It is improved.This method can not only meet the requirement of the degree of cross linking, and the controllability of PEX-a whole preparation process is high, obtained
The resistance to precipitation performance of antioxidant is good in tubing.
In a preferred method, reactive antioxidant and assistant crosslinking agent are introduced simultaneously in antioxidant master batch, can be bigger
The raising PEX-a of degree production efficiency, in a preferred approach, the speed that plunger method can be produced to PEX-a are carried by 1m/min
Level of the height to 4.5m/min or so.
In addition, in a preferred approach, reactive antioxidant and assistant crosslinking agent collocation use, can be reduced in antioxidant master batch
The autohemagglutination of reactive antioxidant and its capture effect to living radical, can effectively lift grafting efficiency, reduce and prepare PEX
The usage amount of reactivity antioxidant during pipe, reduce the cost of product.
Embodiment
In order to be better understood from technical scheme, present disclosure is expanded on further with reference to embodiment,
But present disclosure is not limited only to following examples.
Part material used in the embodiment of the present invention and assay method are described as follows：
High density polyethylene (HDPE)：LG XL1800, melt index are 2g/10min (190 DEG C, 21.6kg), and its density is
0.950g/cm3；Borealis HE1878, melt index are 3g/10min (190 DEG C, 21.6kg), and its density is 0.956g/cm3；
Basel Lupolen 5261ZQ456, melt index are 2g/10min (190 DEG C, 21.6kg), and its density is 0.954g/cm3；
Addition type antioxidant：Antioxidant 1076 (BASF), antioxidant 1010 (BASF), antioxidant DSTDP (Guangzhou Qingniao Co.s
Work).
Reactive antioxidant：DBPA (laboratory self-control), AOPP (laboratory self-control)；
Peroxide：Di-tert-butyl peroxide (DTBP), cumyl peroxide (DCP), 2, -5 dimethyl -2,5 two
Tert-butyl group pentane (double two or five), 2, the di-t-butyl 3- hexins (103) of -5 dimethyl -2,5；(being purchased from Akzo Nobel)；
Assistant crosslinking agent：Triallyl cyanurate (TAC), iso-cyanuric acid triallyl ester (TAIC), trihydroxy methyl
Propane trimethyl acrylic ester (TMPTMA)；(being purchased from jade of the He family chemical industry)
Lubricant：Fatty acid amide, stearate, Tissuemat E, ethylene-vinyl acetate copolymer, ethylene-acrylic acid are common
Polymers.(being purchased from jade of the He family chemical industry)
Degree of cross linking measure refers to international standard ISO10147:1994《Crosslinked polyethylene PE-X tubing determines one by one with pipe fitting
Gel content determines the degree of cross linking》.
Embodiment 1：
(1) antioxidant master batch raw material mixes：LG XL1800, DTBP, DBPA are according to 100：2：5 part by weight mixing, puts
Enter in homogenizer and stir 15 minutes, mixing speed 400RPM；
(2) melt blending of antioxidant master batch raw material：Compound once feeds intake from barrel, and the rotating speed of single screw extrusion machine is
100RPM, its temperature range are set as 120-150 DEG C；
(3) it is heat-treated：The pellet of extrusion is positioned in constant temperature oven, its temperature is set as 190 DEG C, at this temperature DTBP
Half-life period is 0.7 minute, sets pretreatment time as 1 times of half-life, carries out crushing granulation afterwards, and it is female that antioxidant is made
Grain.
(4) by high density polyethylene (HDPE) (HDPE), antioxidant master batch, peroxide DTBP and lubricant polyethylene wax according to
90：10：0.2：(100RPM) stirring is sufficiently mixed 0.5 part by weight at a high speed, and plunger-type extruder, profit are put into from main spout
Sample is pressed into feed zone with piston higher punching press, by linkage section, the last die extrusion of barrel, the temperature of different zones is set
It it is 240-260 DEG C for 110-130 DEG C of feed zone, 140-170 DEG C of linkage section, 200-220 DEG C of barrel, die temperature.
Degree of cross linking test result is 83%；The sample of sample and non-crosslinked areas to cross-linked areas in tubing utilizes dichloro
The autohemagglutination antioxidant of methane extractive distillation residual, the content for remaining the antioxidant in tubing reach 84%.Dimethylbenzene is utilized afterwards
Extract and separate PEX-a and uncrosslinked PE, the antioxidant then to be dissociated using dichloromethane extractive distillation, obtain grafting antioxidant and exist
The composition in crosslinking and uncrosslinked region forms, and wherein antioxidant residual in cross-linked areas is 74%, uncrosslinked region antioxidant residual
For 10%.The tubing speed of production of the present embodiment is 2.5m/min.
Embodiment 2：
(1) antioxidant master batch raw material mixes：LG XL1800, DTBP, DBPA and TAC are according to 100：2：5：2 part by weight
Mixing, is put into homogenizer and stirs 15 minutes, mixing speed 400RPM；
(2) melt blending of antioxidant master batch raw material：Compound once feeds intake from barrel, and the rotating speed of single screw extrusion machine is
100RPM, its temperature range are set as 120-150 DEG C；
(3) it is heat-treated：The pellet of extrusion is positioned in constant temperature oven, its temperature is set as 190 DEG C, at this temperature DTBP
Half-life period is 0.7 minute, sets pretreatment time as 1 times of half-life, carries out crushing granulation afterwards, and it is female that antioxidant is made
Grain；
(4) by high density polyethylene (HDPE) (HDPE), antioxidant master batch, initiator DTBP and lubricant polyethylene wax according to 90：
10：0.2：(100RPM) stirring is sufficiently mixed 0.5 part by weight at a high speed, is put into plunger-type extruder from main spout, is utilized
Sample is pressed into feed zone by piston higher punching press, and by linkage section, the last die extrusion of barrel, the temperature of different zones is set as
110-130 DEG C of feed zone, 140-170 DEG C of linkage section, 200-220 DEG C of barrel, die temperature are 240-260 DEG C.
Degree of cross linking test result is 85%, and the sample of sample and non-crosslinked areas to cross-linked areas in tubing utilizes dichloro
The autohemagglutination antioxidant of methane extractive distillation residual, the content for remaining the antioxidant in tubing reach 87%.Dimethylbenzene is utilized afterwards
To extract and separate PEX-a and uncrosslinked PE, the antioxidant then to dissociate using dichloromethane extractive distillation, grafting antioxidant is obtained
Composition in crosslinking and uncrosslinked region forms, and wherein cross-linked areas antioxidant residual is 80%, and uncrosslinked region antioxidant is residual
It is left 7%, tubing speed of production is 3.4m/min.
Embodiment 3：
(1) antioxidant master batch raw material mixes：LG XL1800, DTBP, AOPP are according to 100：2：5 part by weight mixing, puts
Enter in homogenizer and stir 15 minutes, mixing speed 400RPM；
(2) melt blending of antioxidant master batch raw material：Compound once feeds intake from barrel, and the rotating speed of single screw extrusion machine is
100RPM, its temperature range are set as 120-150 DEG C；
(3) it is heat-treated：The pellet of extrusion is positioned in constant temperature oven, its temperature is set as 190 DEG C, at this temperature DTBP
Half-life period is 0.7 minute, sets pretreatment time as 1 times of half-life, carries out crushing granulation afterwards, and it is female that antioxidant is made
Grain；
(4) by high density polyethylene (HDPE) (HDPE), antioxidant master batch, peroxide DTBP and lubricant polyethylene wax according to
90：10：0.2：(100RPM) stirring is sufficiently mixed 0.5 part by weight at a high speed, and plunger-type extruder, profit are put into from main spout
Sample is pressed into feed zone with piston higher punching press, by linkage section, the last die extrusion of barrel, the temperature of different zones is set
It it is 240-260 DEG C for 110-130 DEG C of feed zone, 140-170 DEG C of linkage section, 200-220 DEG C of barrel, die temperature.
Degree of cross linking test result is 87%, and the sample of sample and non-crosslinked areas to cross-linked areas in tubing utilizes dichloro
The autohemagglutination antioxidant of methane extractive distillation residual, the content for remaining the antioxidant in tubing reach 84%.In addition first with two
Toluene the antioxidant then to dissociate using dichloromethane extractive distillation, it is anti-to obtain grafting to extract and separate PEX-a and uncrosslinked PE
Composition of the oxygen agent in crosslinking and uncrosslinked region forms, and wherein antioxidant residual in cross-linked areas is 74%, uncrosslinked region antioxygen
Agent residual is 10%.The tubing speed of production of the present embodiment is 2.5m/min.
Embodiment 4：
(1) antioxidant master batch raw material mixes：LGXL1800, DTBP, DBPA, AOPP and TAIC are according to 100：2：2：3：2
Part by weight mixes, and is put into homogenizer and stirs 15 minutes, mixing speed 400RPM；
(2) melt blending of antioxidant master batch raw material：Compound once feeds intake from barrel, and the rotating speed of single screw extrusion machine is
100RPM, its temperature range are set as 120-150 DEG C；
(3) it is heat-treated：The pellet of extrusion is positioned in constant temperature oven, its temperature is set as 190 DEG C, at this temperature DTBP
Half-life period is 0.7 minute, sets pretreatment time as 1 times of half-life, carries out crushing granulation afterwards, and it is female that antioxidant is made
Grain；
(4) by high density polyethylene (HDPE) (HDPE), antioxidant master batch, peroxide DTBP and lubricant polyethylene wax according to
90：10：0.2：(100RPM) stirring is sufficiently mixed 0.5 part by weight at a high speed, and plunger-type extruder, profit are put into from main spout
Sample is pressed into feed zone with piston higher punching press, by linkage section, the last die extrusion of barrel, the temperature of different zones is set
It it is 240-260 DEG C for 110-130 DEG C of feed zone, 140-170 DEG C of linkage section, 200-220 DEG C of barrel, die temperature.
Degree of cross linking test result is 93%, and the sample of sample and non-crosslinked areas to cross-linked areas in tubing utilizes dichloro
The autohemagglutination antioxidant of methane extractive distillation residual, the content for remaining the antioxidant in tubing reach 98%.Dimethylbenzene is utilized afterwards
To extract and separate PEX-a and uncrosslinked PE, the antioxidant then to dissociate using dichloromethane extractive distillation, grafting antioxidant is obtained
Composition in crosslinking and uncrosslinked region forms, and wherein cross-linked areas antioxidant residual is 93%, and uncrosslinked region antioxidant is residual
It is left 5%.The tubing speed of production of the present embodiment is 4.5m/min.
Embodiment 5：
(1) antioxidant master batch raw material mixes：LGXL1800, DTBP, DBPA, AOPP and TAIC are according to 100：2：1：4：2
Part by weight mixes, and is put into homogenizer and stirs 15 minutes, mixing speed 400RPM；
(2) melt blending of antioxidant master batch raw material：Compound once feeds intake from barrel, and the rotating speed of single screw extrusion machine is
100RPM, its temperature range are set as 120-150 DEG C；
(3) it is heat-treated：The pellet of extrusion is positioned in constant temperature oven, its temperature is set as 190 DEG C, at this temperature DTBP
Half-life period is 0.7 minute, sets pretreatment time as 1 times of half-life, carries out crushing granulation afterwards, and it is female that antioxidant is made
Grain；
(4) by high density polyethylene (HDPE) (HDPE), antioxidant master batch, initiator DTBP and lubricant polyethylene wax according to 90：
10：0.2：(100RPM) stirring is sufficiently mixed from main spout input plunger-type extruder 0.5 part by weight at a high speed, utilizes work
Sample is pressed into feed zone by plug high pressure punching press, by linkage section, the last die extrusion of barrel, the temperature of different zones be set as into
Expect 110-130 DEG C of section, 140-170 DEG C of linkage section, 200-220 DEG C of barrel, die temperature is 240-260 DEG C.
Degree of cross linking test result is 90%, and the sample of sample and non-crosslinked areas to cross-linked areas in tubing utilizes dichloro
The autohemagglutination antioxidant of methane extractive distillation residual, the content for remaining the antioxidant in tubing reach 96%.Dimethylbenzene is utilized afterwards
To extract and separate PEX-a and uncrosslinked PE, the antioxidant then to dissociate using dichloromethane extractive distillation, grafting antioxidant is obtained
Composition in crosslinking and uncrosslinked region forms, and wherein cross-linked areas antioxidant residual is 90%, and uncrosslinked region antioxidant is residual
It is left 6%.The tubing speed of production of the present embodiment is 4m/min.
Embodiment 6：
(1) antioxidant master batch raw material mixes：The ZQ456 of Lupolen 5261, DTBP, 1076 are according to 100：2：5 weight ratio
Example mixing, is put into homogenizer and stirs 15 minutes, mixing speed 400RPM；
(2) melt blending of antioxidant master batch raw material：Compound once feeds intake from barrel, and the rotating speed of single screw extrusion machine is
100RPM, its temperature range are set as 120-150 DEG C；
(3) it is heat-treated：The pellet of extrusion is positioned in constant temperature oven, its temperature is set as 190 DEG C, at this temperature DTBP
Half-life period is 0.7 minute, sets pretreatment time as 2 times of half-lifes, carries out crushing granulation afterwards, and it is female that antioxidant is made
Grain；
(4) by high density polyethylene (HDPE) (HDPE), antioxidant master batch, peroxide DTBP and lubricant polyethylene wax according to
90：10：0.2：(100RPM) stirring is sufficiently mixed 0.5 part by weight at a high speed, and plunger-type extruder, profit are put into from main spout
Sample is pressed into feed zone with piston higher punching press, by linkage section, the last die extrusion of barrel, the temperature of different zones is set
It it is 240-260 DEG C for 110-130 DEG C of feed zone, 140-170 DEG C of linkage section, 200-220 DEG C of barrel, die temperature.
Degree of cross linking test result is 75%；The sample of sample and non-crosslinked areas to cross-linked areas in tubing utilizes dichloro
The autohemagglutination antioxidant of methane extractive distillation residual, the content for remaining the antioxidant in tubing reach 48%.Dimethylbenzene is utilized afterwards
To extract and separate PEX-a and uncrosslinked PE, the antioxidant then to dissociate using dichloromethane extractive distillation, grafting antioxidant is obtained
Composition in crosslinking and uncrosslinked region forms, and wherein cross-linked areas antioxidant residual is 35%, and uncrosslinked region antioxidant is residual
It is left 13%.The tubing speed of production of the present embodiment is 1.5m/min.
Embodiment 7：
(1) antioxidant master batch raw material mixes：The ZQ456 of Lupolen 5261, DTBP, 1076 and TAC are according to 100：2：5：2
Part by weight mixing, be put into homogenizer and stir 15 minutes, mixing speed 400RPM；
(2) melt blending of antioxidant master batch raw material：Compound once feeds intake from barrel, and the rotating speed of single screw extrusion machine is
100RPM, its temperature range are set as 120-150 DEG C；
(3) it is heat-treated：The pellet of extrusion is positioned in constant temperature oven, its temperature is set as 190 DEG C, at this temperature DTBP
Half-life period is 0.7 minute, sets pretreatment time as 2 times of half-lifes, carries out crushing granulation afterwards, and it is female that antioxidant is made
Grain；
(4) by high density polyethylene (HDPE) (HDPE), antioxidant master batch, peroxide DTBP and lubricant polyethylene wax according to
90：10：0.2：(100RPM) stirring is sufficiently mixed 0.5 part by weight at a high speed, and plunger-type extruder, profit are put into from main spout
Sample is pressed into feed zone with piston higher punching press, by linkage section, the last die extrusion of barrel, the temperature of different zones is set
It it is 240-260 DEG C for 110-130 DEG C of feed zone, 140-170 DEG C of linkage section, 200-220 DEG C of barrel, die temperature.
Degree of cross linking test result is 78%.The sample of sample and non-crosslinked areas to cross-linked areas in tubing utilizes dichloro
The autohemagglutination antioxidant of methane extractive distillation residual, the content for remaining the antioxidant in tubing reach 58%.In addition first with two
Toluene the antioxidant then to dissociate using dichloromethane extractive distillation, it is anti-to obtain grafting to extract and separate PEX-a and uncrosslinked PE
Composition of the oxygen agent in crosslinking and uncrosslinked region forms, and wherein antioxidant residual in cross-linked areas is 45%, uncrosslinked region antioxygen
Agent residual is 13%.The tubing speed of production of the present embodiment is 1.8m/min.
Comparative example 1：
By the ZQ456 of Lupolen 5261, DTBP, 1076 and lubricant polyethylene wax according to 100：0.4：0.5：0.5 weight
(100RPM) stirring is sufficiently mixed amount ratio at a high speed, and plunger-type extruder is put into from main spout, will using piston higher punching press
Sample is pressed into feed zone, and by linkage section, the last die extrusion of barrel, the temperature of different zones is set as feed zone 110-130
DEG C, 140-170 DEG C of linkage section, 200-220 DEG C of barrel, die temperature is 240-260 DEG C.
Degree of cross linking test result is 70%, and the sample of sample and non-crosslinked areas to cross-linked areas in tubing utilizes dichloro
The autohemagglutination antioxidant of methane extractive distillation residual, the content for remaining the antioxidant in tubing reach 42%.Dimethylbenzene is utilized afterwards
To extract and separate PEX-a and uncrosslinked PE, the antioxidant then to dissociate using dichloromethane extractive distillation, grafting antioxidant is obtained
Composition in crosslinking and uncrosslinked region forms, and wherein cross-linked areas antioxidant residual is 22%, and uncrosslinked region antioxidant is residual
It is left 20%, throughput rate 1m/min.
Comparative example 2：
By LG XL1800, DTBP, DBPA, AOPP and lubricant polyethylene wax according to 100：0.4：0.1：0.4：0.5 weight
(100RPM) stirring is sufficiently mixed amount ratio at a high speed, and plunger-type extruder is put into from main spout, will using piston higher punching press
Sample is pressed into feed zone, and by linkage section, the last die extrusion of barrel, the temperature of different zones is set as feed zone 110-130
DEG C, 140-170 DEG C of linkage section, 200-220 DEG C of barrel, die temperature is 240-260 DEG C.
Degree of cross linking test result is 78%, and the sample of sample and non-crosslinked areas to cross-linked areas in tubing utilizes dichloro
The autohemagglutination antioxidant of methane extractive distillation residual, the content for remaining the antioxidant in tubing reach 78%.Dimethylbenzene is utilized afterwards
To extract and separate PEX-a and uncrosslinked PE, the antioxidant then to dissociate using dichloromethane extractive distillation, grafting antioxidant is obtained
Composition in crosslinking and uncrosslinked region forms, and wherein cross-linked areas antioxidant residual is 64%, and uncrosslinked region antioxidant is residual
It is left 14%, throughput rate 2m/min.
Comparative example 3：
By LG XL1800, DBPA, AOPP, TAC and lubricant polyethylene wax according to 100：0.4：0.2：0.3：0.5 weight
(100RPM) stirring is sufficiently mixed amount ratio at a high speed, and plunger-type extruder is put into from main spout, will using piston higher punching press
Sample is pressed into feed zone, and by linkage section, the last die extrusion of barrel, the temperature of different zones is set as feed zone 110-130
DEG C, 140-170 DEG C of linkage section, 200-220 DEG C of barrel, die temperature is 240-260 DEG C.
Degree of cross linking test result is 80%, and the sample of sample and non-crosslinked areas to cross-linked areas in tubing utilizes dichloro
The autohemagglutination antioxidant of methane extractive distillation residual, the content for remaining the antioxidant in tubing reach 78%.Dimethylbenzene is utilized afterwards
To extract and separate PEX-a and uncrosslinked PE, the antioxidant then to dissociate using dichloromethane extractive distillation, grafting antioxidant is obtained
Composition in crosslinking and uncrosslinked region forms, and wherein cross-linked areas antioxidant residual is 72%, and uncrosslinked region antioxidant is residual
It is left 6%, the throughput rate of tubing is 2.2m/min.
As fully visible, PEX-a pipes are prepared using the antioxidant master batch of the present invention, it is anti-by being introduced in antioxidant master batch
Answering property antioxidant can be obviously improved the residual quantity of antioxidant in the substrate.Hinered phenols reactivity is introduced in antioxidant master batch
Antioxidant, the PEX-a produced manage the residual quantity of its degree of cross linking and antioxidant in the substrate and are below drawing in antioxidant master batch
Enter hindered amines reactivity antioxidant.And with the introducing of assistant crosslinking agent, can elimination reaction antioxidant example to a certain extent
If DBPA etc. itself is to the adverse effect caused by cross-linking reaction, while also improve residual content of the antioxidant in cross-linked areas.
Compared to using one-step method directly PEX-a control for when introduce reactive antioxidant and assistant crosslinking agent, the present invention is logical
Cross in antioxidant master batch and introduce these components and further obtained pipe performance is more excellent, and the masterbatch method of the present invention is also significantly
The throughput rate of tubing is improved, 4.5m/min can be promoted to from 1m/min.To sum up, use the antioxidant master batch of the present invention can be with
Antioxidant is greatly improved in the long term thermal oxygen performance of PEX-a pipes and the production efficiency of PEX- pipes.It is female using the antioxidant of the present invention
Grain can efficiently prepare PEX-a pipes, and possess the features such as antioxidant resistance to precipitation.
It will be understood by those skilled in the art that under the teaching of this specification, the present invention can be made some modifications or
Adjustment.These modifications or adjustment should also be as within the scope of the claims in the present invention.
Claims (16)
1. a kind of antioxidant master batch, it is characterised in that be made using each component for including following parts by weight：High density polyethylene (HDPE)
100 parts, peroxide 0.1-4 parts, assistant crosslinking agent 0-4 parts, and antioxidant of the parts by weight more than 0 and less than or equal to 10 parts.
2. antioxidant master batch according to claim 1, it is characterised in that the antioxidant includes reactive antioxidant and added
Add at least one of type antioxidant, both the reactive antioxidant and addition type the antioxidant weight in antioxidant formula of master batch
It is preferably respectively 0-5 parts to measure part, and the parts by weight sum of the two is more than 0.
3. antioxidant master batch according to claim 1, it is characterised in that the antioxidant includes reactive antioxidant, institute
State parts by weight of the reactive antioxidant in antioxidant formula of master batch and be preferably greater than 0 and less than or equal to 5 parts.
4. according to the antioxidant master batch described in claim any one of 2-3, it is characterised in that the reactive antioxidant includes band
There are the one or more in the hindered amines or Hinered phenols antioxidant of unsaturated double-bond, it is preferred that the reactive antioxidant
Number-average molecular weight be less than 1000.
5. antioxidant master batch according to claim 2, it is characterised in that the addition type antioxidant is can not be with high density
Polyethylene crosslinks the antioxidant of reaction；Preferably, the addition type antioxidant is antioxidant 1076, antioxidant 1035, resisted
One or more in oxygen agent DSTDP.
6. according to the antioxidant master batch described in claim any one of 1-5, it is characterised in that the parts by weight of the assistant crosslinking agent are big
In 0 and less than or equal to 4 parts.
7. according to the antioxidant master batch described in claim any one of 1-6, it is characterised in that the assistant crosslinking agent includes carrying three
The compound of the double bond of cross-linking reaction is may participate in more than individual；Preferably, the assistant crosslinking agent include triallyl cyanurate,
One in iso-cyanuric acid triallyl ester, trimethylol-propane trimethacrylate, poly- iso-cyanuric acid triallyl ester
Kind is several.
8. according to the antioxidant master batch described in claim any one of 1-7, it is characterised in that the peroxide is selected from 1min half
The phase temperature that declines is 150-220 DEG C of peroxide；Preferably, the peroxide is selected from cumyl peroxide, peroxidating two
One kind or several in the tert-butyl group, 2,5- dimethyl -2,5- di-t-butyls pentane, 2,5- dimethyl -2,5- di-t-butyl -3- hexins
Kind.
9. according to the antioxidant master batch described in claim any one of 1-8, it is characterised in that the density of the high density polyethylene (HDPE)
For 0.945-0.965g/cm3, melt index is 1.2-9g/10min (21.6kg), weight average molecular weight Mw=200000-
500000。
10. the preparation method of the antioxidant master batch described in claim any one of 1-9, it is characterised in that comprise the following steps：Press
Each component melt blending is granulated by formula ratio；Preferably, the temperature of melt blending is 120-150 DEG C.
11. preparation method according to claim 10, it is characterised in that enter before pelletizing to melt blending resulting material
Row heat treatment, the temperature of the heat treatment are preferably controlled in the range of peroxide 1min half life temperature ± 5 DEG C, the heat
The time of processing is preferably 0.5-5 times of half-life of the peroxide under the heat treatment temperature.
12. a kind of preparation method of PEX-a pipes, it is characterised in that comprise the following steps：Using any one of claim 1-9 institutes
Antioxidant master batch prepared by the preparation method described in the antioxidant master batch or any one of 10-11 stated, by antioxidant master batch and other
Component mixes, extrusion molding.
13. preparation method according to claim 12, it is characterised in that preparing the raw material of PEX-a pipes includes following weight
The each component of part：Parts by weight sum is 100 parts of high density polyethylene (HDPE) and antioxidant master batch, and parts by weight are the peroxide of 0.1-1 parts
Compound, wherein the parts by weight of described antioxidant master batch are more than 0 and less than or equal to 15 parts；
Preferably, the lubricant of 0-1 parts by weight is included；
Preferably, the peroxide is the peroxide that 1min half life temperatures are 150-220 DEG C；It is further preferred that institute
State peroxide and be selected from cumyl peroxide, di-t-butyl peroxide, 2,5- dimethyl -2,5- di-t-butyls pentane, 2,5-
One or more in dimethyl -2,5- di-t-butyl -3- hexins；
Preferably, the density of the high density polyethylene (HDPE) is 0.945-0.965g/cm3, melt index 1.2-9g/10min
(21.6kg), weight average molecular weight Mw=200000-500000.
14. preparation method according to claim 13, it is characterised in that preparing the raw material of PEX-a pipes also includes following weight
Measure each component of part：Reactive antioxidant 0-1 parts, addition type antioxidant 0-1 parts, assistant crosslinking agent 0-1 parts；
Preferably, the reactive antioxidant includes one in hindered amines or Hinered phenols antioxidant with unsaturated double-bond
Kind is several, it is preferred that the number-average molecular weight of the reactive antioxidant is less than 1000.
Preferably, the assistant crosslinking agent includes the compound with more than three double bonds that may participate in cross-linking reaction；It is further excellent
Choosing, the assistant crosslinking agent is selected from triallyl cyanurate, iso-cyanuric acid triallyl ester, trimethylolpropane tris first
One or more in base acrylate, poly- iso-cyanuric acid triallyl ester；
Preferably, the addition type antioxidant is the antioxidant that reaction can not be crosslinked with high density polyethylene (HDPE)；Preferably, institute
Addition type antioxidant is stated as the one or more in antioxidant 1076, antioxidant 1035, antioxidant DSTDP.
15. according to the preparation method described in claim any one of 12-14, it is characterised in that during extrusion molding, control feed zone
Temperature is 110-130 DEG C, and linkage section temperature is 140-170 DEG C, and barrel temperature is 200-220 DEG C, die temperature 240-260
℃。
16. the preparation method system described in antioxidant master batch or claim any one of 10-11 described in claim any one of 1-9
Application of the antioxidant master batch obtained in PEX pipes are prepared, it is preferred that the PEX pipes are managed for PEX-a.
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| CN114479247B (en) * | 2022-03-02 | 2023-09-22 | 广东邦英新材料有限公司 | Anti-aging master batch UV-H300PE and preparation method and application thereof |
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Application publication date: 20180302 |