CN105367865B - The preparation process of low-expansion coefficient polyethylene foam gasket for packing - Google Patents

The preparation process of low-expansion coefficient polyethylene foam gasket for packing Download PDF

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Publication number
CN105367865B
CN105367865B CN201510553956.9A CN201510553956A CN105367865B CN 105367865 B CN105367865 B CN 105367865B CN 201510553956 A CN201510553956 A CN 201510553956A CN 105367865 B CN105367865 B CN 105367865B
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Prior art keywords
packing
parts
gasket
10min
density polyethylene
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CN105367865A (en
Inventor
程晓松
孙玉萍
薛长志
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Jiangsu Hengtong Wire and Cable Technology Co Ltd
Suzhou Hengli Communications Material Co Ltd
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Suzhou Hengli Communications Material Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0012—Combinations of extrusion moulding with other shaping operations combined with shaping by internal pressure generated in the material, e.g. foaming
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/154—Coating solid articles, i.e. non-hollow articles
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2203/00—Applications
    • C08L2203/14—Applications used for foams
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • 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
    • C08L2207/062—HDPE
    • 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
    • C08L2207/066—LDPE (radical process)

Abstract

The invention discloses a kind of preparation processes of low-expansion coefficient polyethylene foam gasket for packing, include the following steps：By 30 parts of low density polyethylene (LDPE) that melt index is 0.03 ~ 0.09 g/10min, the high density polyethylene (HDPE) that melt index is 1.8 ~ 3.2 g/10min（First）40 parts, the high density polyethylene (HDPE) that melt index is 5 ~ 9 g/10min（Second）30 parts, 15 parts of calcium carbonate superfine powder is positioned over high-speed mixer and mixing and is formed uniformly mixture；The mixture is sent into double screw extruder, Ф 2.5mm strips are extruded into；By 50 parts of foamed material semi-finished product, high density polyethylene (HDPE)（First）Three, is uniformly mixed by high mixer and obtains the foaming packing gasket granule material by 50 parts and 1 part of masterbatch of nucleation.The present invention is easily dispersed uniformly; reduce harmful effect of the use of multiclass auxiliary agent to plastics final performance; so that the degree of drying of gasket for packing and the filling degree of air are more constant, increase tension, the lateral compressive strength of gasket for packing, be relatively beneficial to its protective effect to light wave guide.

Description

The preparation process of low-expansion coefficient polyethylene foam gasket for packing
Technical field
The present invention relates to the preparation process fields of polyethylene foam gasket for packing, and in particular to a kind of low bulk for optical cable Coefficient polyethylene foam gasket for packing.
Background technology
Existing optical cable with gasket for packing majority be high density Insulation Material squeeze out solid cord, due to hardness height, with it is other It is larger that element is stranding into the extruding force being subject in machine when cable core altogether, limits high-speed production, and it is easy to squeeze optical fiber list Other elements such as the Loose tube of member, make cable core deform, influence the roundness of optical cable.Secondly, solid cord raw material dosage is big, manufacture Of high cost, its own weight is big, causes optical cable transportation cost higher.In addition solid cord hardness is big, and external force resistance resiliency is poor, protects Protect less effective.
For the deficiency of optical cable hatching solid rope, foaming filling rope for optical cables comes into being, because cost of material is low, The advantages that protecting effect is good, light-weight and be widely noticed, but at present about its manufacturing method and market application report relatively It is few, and the data of such gasket for packing particulate material is even more very few, and there is problems.As CN101382626A is disclosed The patent of invention of a kind of " optical cable foaming packing gasket granule material and its production method ", packing gasket granule material in the patented technology Raw material has low density polyethylene (LDPE), high density polyethylene (HDPE), polypropylene, polyethylene wax, stearic acid, calcium stearate and tetrapentaerythritol fat Deng component is more, and proportional difference is larger, weighs trouble, is not easy to disperse, it is more difficult to be uniformly mixed；And due to each component unit price Costly, manufacturing cost still quite has pressure；In addition, the addition of a variety of auxiliary agents is generated not using the final performance being easy to product Good influence causes product air entrapment to be unevenly distributed, and can leave small molecule residue in reproduced goods, influences the mechanical property of product Energy.
Invention content
The object of the present invention is to provide a kind of preparation process of low-expansion coefficient polyethylene foam gasket for packing, the sides of weighing Just, manpower is saved, each component ratio is more close, is easily dispersed uniformly；Contained only in raw material polyvinyl resin, calcium carbonate and at Core masterbatch reduces harmful effect of the use of multiclass auxiliary agent to plastics final performance；The addition of certain proportion calcium carbonate is effective Reduce the cost of material；It, can be tight with plastic film surrounding layer by the foaming packing gasket body obtained by the particle as buried layer Close combination increases tension, the lateral pressure resistant of gasket for packing so that the degree of drying of gasket for packing and the filling degree of air are more constant Intensity is relatively beneficial to its protective effect to light wave guide.
In order to achieve the above objectives, the technical solution adopted by the present invention is：One kind is filled out for low-expansion coefficient polyethylene foam The preparation process for filling rope, includes the following steps：
Step 1: by 30 parts of low density polyethylene (LDPE) that melt index is 0.03 ~ 0.09 g/10min, melt index be 1.8 ~ The high density polyethylene (HDPE) of 3.2 g/10min（First）40 parts, the high density polyethylene (HDPE) that melt index is 5 ~ 9 g/10min（Second）30 Part, 15 parts of calcium carbonate superfine powder are positioned over high-speed mixer and mixing and are formed uniformly mixture；
Step 2: the mixture of step 1 is sent into double screw extruder, it is extruded into Ф 2.5mm strips；
Step 3: the strip of step 2 is dried after water cooling tank cools down using wind turbine, then, it is cut into length 3mm, Ф 2.5mm small columns grain are as foamed material semi-finished product；
Step 4: by 50 parts of foamed material semi-finished product described in step 3, high density polyethylene (HDPE)（First）50 parts and nucleation masterbatch 1 Part, three is uniformly mixed by high mixer and obtains the foaming packing gasket granule material.
Step 5: the packing gasket granule material heated melting in an extruder, while nitrogen being noted under a certain pressure Enter wherein, gas is released using decompression, to generate the uniform bubble combined closely with internal layer, it is 10 to form frothing percentage Buried layer in~80% polyethylene foam gasket for packing body；
Step 6: at a temperature of setting after high speed extrusion, outer layer passes through buried layer in the polyethylene foam gasket for packing body After PBT resin cladding, the polyethylene foam gasket for packing that buried layer is combined closely with clad is formed.
Further improved technical solution is as follows in above-mentioned technical proposal：
1, in said program, the foamed material semi-finished product melt flow rate (MFR) is 0.65 ± 0.20g/10min.
2, in said program, 180 ~ 230 DEG C of the extruder barrel temperature of the step 2 double screw extruder is more from low to high Grade heating, head temperature are 230 DEG C of conditions.
Due to the application of the above technical scheme, the present invention has following advantages compared with prior art：
1. the low-expansion coefficient polyethylene foam gasket for packing that preparation process of the present invention obtains, hardness is moderate, rope body is softer, Can large angle torsion and it is indeformable, but body of restricting has certain hardness again, by can keep oneself when outer force effect to a certain extent Figure shape, the coefficient of expansion are small, be not easy to make in cabling process around other deformed elements, ensure cable core roundness, and due to interior Contain multiple fine and closely woven uniform bubbles in portion so that its own hardness is substantially reduced than entity rope, is that other elements are stranding into altogether The extruding force that cable core is subject to when squeezing out inside equipment is smaller, can be with high-speed production；Secondly as foaming packing gasket density it is small, Light specific gravity so that the weight of unit length optical cable finished product can reduce the transportation cost of optical cable；Again, foaming packing gasket raw material consumes With less, manufacturing cost can be reduced, calcium carbonate unit price is relatively low, significantly reduces cost（Although the use of calcium carbonate is one Determine to increase the weight of gasket for packing itself in degree, but due in this patent gasket for packing be foaming packing gasket, therefore compare entity rope Still there is greater advantage in weight）；Constituent species are relatively fewer, and unit price is relatively low compared to each analog assistant, thus whole manufacture Cost has greater advantage；Each composition ratio difference is smaller, convenient for weighing, saves artificial.
2. the low-expansion coefficient polyethylene foam gasket for packing that preparation process of the present invention obtains, component ratio proportion are poor Different smaller, convenient for weighing, manual operation error is smaller, conducive to ensureing the stability of product quality when batch production；Secondly, it is free of The use of each analog assistant, each analog assistant easily generates harmful effect to the final performance of product, causes the distribution of product air entrapment not , and small molecule residue can be left in product, influence Mechanical Properties of Products.
Specific implementation mode
With reference to embodiment, the invention will be further described：
Embodiment：A kind of preparation process for low-expansion coefficient polyethylene foam gasket for packing, by the group of following parts by weight It is grouped as：
50 parts of foamed material semi-finished product,
High density polyethylene (HDPE)（First）50 parts,
It is nucleated 1 part of masterbatch；
The foamed material semi-finished product are grouped as by the group of following parts by weight:
Melt flow rate (MFR) is 30 parts of the low density polyethylene (LDPE) of 0.03 ~ 0.09 g/10min,
Melt flow rate (MFR) is the high density polyethylene (HDPE) of 1.8 ~ 3.2 g/10min（First）40 parts,
Melt flow rate (MFR) is the high density polyethylene (HDPE) of 5 ~ 9 g/10min（Second）30 parts,
15 parts of micron-class superfine calcium carbonate；
Above-mentioned foamed material semi-finished product melt flow rate (MFR) is 0.65 ± 0.20g/10min.
The preparation process of above-mentioned polyethylene foam gasket for packing, includes the following steps：
Step 1: by 30 parts of low density polyethylene (LDPE) that melt index is 0.03 ~ 0.09 g/10min, melt index be 1.8 ~ The high density polyethylene (HDPE) of 3.2 g/10min（First）40 parts, the high density polyethylene (HDPE) that melt index is 5 ~ 9 g/10min（Second）30 Part, 15 parts of calcium carbonate superfine powder are positioned over high-speed mixer and mixing and are formed uniformly mixture；
Step 2: the mixture of step 1 is sent into double screw extruder, in 180 ~ 230 DEG C of extruder barrel temperature From low to high Ф 2.5mm strips are extruded under the conditions of multistage heating, 230 DEG C of head temperature；
Step 3: the strip of step 2 is dried after water cooling tank cools down using wind turbine, then, it is cut into length 3mm, Ф 2.5mm small columns grain are as foamed material semi-finished product；
Step 4: by 50 parts of foamed material semi-finished product described in step 3, high density polyethylene (HDPE)（First）50 parts and nucleation masterbatch 1 Part, three is uniformly mixed by high mixer and obtains the foaming packing gasket granule material.
Step 5: the packing gasket granule material heated melting in an extruder, while nitrogen being noted under a certain pressure Enter wherein, gas is released using decompression, to generate the uniform bubble combined closely with internal layer, it is 10 to form frothing percentage Buried layer in~80% polyethylene foam gasket for packing body；
Step 6: at a temperature of setting after high speed extrusion, outer layer passes through buried layer in the polyethylene foam gasket for packing body After PBT resin cladding, the polyethylene foam gasket for packing that buried layer is combined closely with clad is formed.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.

Claims (1)

1. a kind of preparation process for low-expansion coefficient polyethylene foam gasket for packing, it is characterised in that：Include the following steps：
Step 1: being 1.8 ~ 3.2 by 30 parts of low density polyethylene (LDPE) that melt index is 0.03 ~ 0.09 g/10min, melt index 40 parts of the high density polyethylene (HDPE) of g/10min, 30 parts of high density polyethylene (HDPE), the calcium carbonate superfine powder that melt index is 5 ~ 9 g/10min 15 parts are positioned over high-speed mixer and mixing and are formed uniformly mixture；
Step 2: the mixture of step 1 is sent into double screw extruder, it is extruded into Ф 2.5mm strips；
Step 3: the strip of step 2 is dried after water cooling tank cools down using wind turbine, then, be cut into long 3mm, Ф 2.5mm small columns grains are as foamed material semi-finished product；
Step 4: by 50 parts of foamed material semi-finished product described in step 3, the high-density polyethylene that melt index is 1.8 ~ 3.2g/10min Three, is uniformly mixed by high mixer and obtains the foaming packing gasket granule material by 50 parts of alkene and 1 part of masterbatch of nucleation；Step 5: The packing gasket granule material heated melting in an extruder, while nitrogen being injected under a certain pressure wherein, using subtracting Pressure releases gas, to generate the uniform bubble combined closely with internal layer, forms the polyethylene that frothing percentage is 10~80% and sends out Steep buried layer in gasket for packing body；
Step 6: buried layer is at a temperature of setting after high speed extrusion in the polyethylene foam gasket for packing body, outer layer is through PBT trees After fat cladding, the polyethylene foam gasket for packing that buried layer is combined closely with clad is formed；The foamed material semi-finished product melt flow Dynamic rate is 0.65 ± 0.20g/10min；180 ~ 230 DEG C of the extruder barrel temperature of the step 2 double screw extruder by as low as High multistage heating, head temperature are 230 DEG C of conditions.
CN201510553956.9A 2012-12-13 2012-12-13 The preparation process of low-expansion coefficient polyethylene foam gasket for packing Active CN105367865B (en)

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CN201210536006.1A CN103035330B (en) 2012-12-13 2012-12-13 Be applied to foaming packing gasket and the preparation technology thereof of optical cable
CN201510553956.9A CN105367865B (en) 2012-12-13 2012-12-13 The preparation process of low-expansion coefficient polyethylene foam gasket for packing

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CN105367865B true CN105367865B (en) 2018-10-30

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CN201510553843.9A Pending CN105131391A (en) 2012-12-13 2012-12-13 Polyethylene material for optical cable
CN201510553956.9A Active CN105367865B (en) 2012-12-13 2012-12-13 The preparation process of low-expansion coefficient polyethylene foam gasket for packing
CN201210536006.1A Active CN103035330B (en) 2012-12-13 2012-12-13 Be applied to foaming packing gasket and the preparation technology thereof of optical cable

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105957636A (en) * 2015-03-10 2016-09-21 蒋菊生 Manufacture method of optical and electric composite cable with special-shaped filling ropes
CN108008507A (en) * 2017-11-24 2018-05-08 中广核拓普（四川）新材料有限公司 Optical cable high-foaming gasket for packing and preparation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1230481A (en) * 1998-03-31 1999-10-06 四川联合大学 Preparation of foamed insulating polyethylene material for coaxial cable
JP2005154547A (en) * 2003-11-25 2005-06-16 Hitachi Cable Ltd Resin composition and high-frequency coaxial cable using the same
CN101012323A (en) * 2007-02-01 2007-08-08 徐晓冰 Polythene physics foaming material and preparing method thereof

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Publication number Priority date Publication date Assignee Title
JP4003116B2 (en) * 2001-11-28 2007-11-07 株式会社フジミインコーポレーテッド Polishing composition for magnetic disk substrate and polishing method using the same
CN1741199A (en) * 2004-08-26 2006-03-01 深圳市联嘉祥电线电缆实业有限公司 Method for producing physical foamed insulation material of coaxle cable
CN201117366Y (en) * 2007-11-16 2008-09-17 成都亨通光通信有限公司 Optical cable possessing foaming filling element
CN101701093B (en) * 2009-11-30 2011-09-07 苏州亨利通信材料有限公司 Special material for color identification of special color polyolefin optical cable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1230481A (en) * 1998-03-31 1999-10-06 四川联合大学 Preparation of foamed insulating polyethylene material for coaxial cable
JP2005154547A (en) * 2003-11-25 2005-06-16 Hitachi Cable Ltd Resin composition and high-frequency coaxial cable using the same
CN101012323A (en) * 2007-02-01 2007-08-08 徐晓冰 Polythene physics foaming material and preparing method thereof

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CN103035330A (en) 2013-04-10
CN105131391A (en) 2015-12-09
CN105367865A (en) 2016-03-02

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Effective date of registration: 20220120

Address after: 215234 88 Hengtong Road, seven Du Town, Wujiang District, Suzhou, Jiangsu

Patentee after: SUZHOU HENGLI COMMUNICATION MATERIAL Co.,Ltd.

Patentee after: Jiangsu Hengtong Cable Technology Co., Ltd

Address before: 215234 88 Hengtong Road, seven Du Town, Wujiang District, Suzhou, Jiangsu

Patentee before: SUZHOU HENGLI COMMUNICATION MATERIAL Co.,Ltd.