CN107775833B - 过氧化物交联聚乙烯管着色生产工艺 - Google Patents
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- 238000001035 drying Methods 0.000 claims abstract description 6
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- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 5
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 4
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- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical compound FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims description 3
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/002—Methods
- B29B7/005—Methods for mixing in batches
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
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- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
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- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/802—Heating
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- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/86—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the nozzle zone
- B29C48/865—Heating
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- 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
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/91—Heating, e.g. for cross linking
- B29C48/9105—Heating, e.g. for cross linking of hollow articles
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Abstract
本发明涉及一种过氧化物交联聚乙烯管着色生产工艺,包括以下步骤:将原料(HDPE粉料)、交联剂(液态)、抗氧化剂按比例放入混合设备中混合均匀成为预混料;将色母(着色剂)研磨成色粉后过筛;将色粉烘干脱水;将色粉与预混料放到混合设备中进行二次混配;做模具涂层;全混料喂入柱塞式挤出机中,首先经过机体加热区进行加热,再经转接器加热区进行加热,随后经过连接盘进入模具的一段加温区进行一次加温,最后通过模具的二段加温区进行二次加温后形成管材被挤出;挤出的管材通过冷却水槽成型;本发明生产的彩色过氧化物交联聚乙烯管材交联度好,彩色持久,防紫外线,管内不易滋生细菌等微生物和结成水垢,管材使用效果好、使用寿命长。
Description
技术领域
本发明涉及一种塑料管生产工艺,具体说是一种过氧化物交联聚乙烯管着色生产工艺。
背景技术
过氧化物交联聚乙烯管材广泛应用于水、气、油、地板采暖介质等流体的输送,目前市场上所有过氧化物交联聚乙烯管材都为普通本色管材,在实际使用过程中经常受阳光紫外线照射,很容易在管材内部生成微生物,结成水垢,造成管腔阻塞,流速减慢,影响正常使用,而且会使管材过早老化脆裂,缩短使用寿命。众所周知和无数应用实例证明,若将本色的过氧化物交联聚乙烯管替换成具有某种颜色的彩色管材,则可大大提高防紫外线的能力,有效克服管内滋生细菌等微生物和易结水垢的缺陷,提高管材使用效果,延长管材寿命,但是,目前国内尚没有一种成熟的可对过氧化物交联聚乙烯管进行着色的生产工艺。
发明内容
为提高过氧化物交联聚乙烯管防紫外线性能,提高其使用效果,延长使用寿命,本发明提供一种过氧化物交联聚乙烯管着色生产工艺,从而可生产出不同彩色的过氧化物交联聚乙烯管。
本发明的技术方案是,过氧化物交联聚乙烯管着色生产工艺包括以下步骤:
第一步,一次混配:将原料(HDPE粉料)、交联剂(液态)、抗氧化剂按100kg、550g、200g比例放入混合设备中混合均匀成为预混料;
第二步,将色母(着色剂)研磨后过筛,成为细度≥200目的色粉;
第三步,将色粉放入烘干设备中保持温度60℃-65℃,去除色粉中所含水份;
第四步,二次混配:将定量的色粉与预混料放到混合设备中进行二次混配,确保混合均匀、充分,使之成为全混料;
第五步,在模具的空模内壁及芯轴上涂覆一层聚四氟乙烯,确保加热挤出管材时通畅润滑;
第六步,四温区加热挤出:将全混料经喂料口喂入柱塞式挤出机中,在柱塞的挤压过程中,全混料首先经过机体加热区进行约110℃的加热,再经转接器加热区进行约170℃的加热,随后经过连接盘进入模具的一段加温区进行190℃-220℃的加温(一次加温),最后通过模具的二段加温区进行250℃-260℃加温(二次加温)后形成管材被挤出;
第七步,挤出的管材通过冷却水槽成型。
应用本发明生产的彩色过氧化物交联聚乙烯管,管材交联度好,彩色持久,防紫外线,管内不易滋生细菌等微生物和结成水垢,可有效提高管材使用效果,延长管材使用寿命。
附图说明
图1是本发明工艺流程图;
图2是涉及本发明的柱塞式挤出机示意图。
具体实施方式
下面结合附图对本发明作进一步描述。
如图1所示,本发明过氧化物交联聚乙烯管着色生产工艺如下:
第一步,一次混配:将原料(HDPE粉料)、交联剂(液态)、抗氧化剂按100kg、550g、200g比例放入混合设备中混合均匀成为预混料;
第二步,将色母(着色剂)研磨后过筛,成为细度≥200目的色粉;
第三步,色粉烘干:将色粉放入烘干设备中保持温度60℃-65℃,去除色粉中所含水份,温度过高色粉会出现熔融现象,温度过低则烘干不彻底;
第四步,二次混配:将定量的色粉与预混料放到混合设备中进行二次混配,确保混合均匀、充分,使之成为全混料;
由于过筛、烘干好的色粉粒度小于原料粒度,加之在一次混配中需要加入液态的辅料-交联剂,为使混配均匀,本发明采用二步法原料混配工艺,即先进行一次混配,再进行二次混配,以确保混配的原料达到后序加工工艺要求;
第五步,模具涂层:在模具4的空模内壁及芯轴5上涂覆一层聚四氟乙烯,确保加热挤出管材时通畅润滑;
第六步,四温区加热挤出:如图2所示,将全混料经喂料口1喂入柱塞式挤出机中,在柱塞2的挤压过程中,全混料首先经过机体加热区A进行约110℃的加热,再经转接器加热区B进行约170℃的加热,随后经过连接盘3进入模具4的一段加温区C进行190℃-220℃的加温(一次加温),最后通过模具的二段加温区D进行250℃-260℃加温(二次加温)后形成管材被挤出;
由于色粉融点约为220℃,而原料(HDPE粉料)的挤出温度在250℃-260℃,如果按原有的3温区加热工艺,即机体加热区→转接器加热区→模具加温段的工艺加热挤出,会导致色粉碳化严重,成品率低,为此,本发明采用4温区分段控温加热方式,除机体加热区A、转接器加热区B外,将模具加温段分成一段加温区C和二段加温区D,并分别实施不同温度的控制,当全混料进入模具的一段加温区C时,先进行190℃-220℃的加温(一次加温),保证了色粉和原料在此温度中的完全融合,最后进入模具的二段加温区D段进行250℃-260℃加温(二次加温)时,完成融合成一体的原料则不会因温度过高造成色粉碳化;
第七步,冷却成型:挤出的管材通过冷却水槽成型。
Claims (1)
1.过氧化物交联聚乙烯管着色生产工艺,其特征是,包括以下步骤:
第一步,一次混配:将HDPE粉料、液态交联剂、抗氧化剂按100kg、550g、200g配比放入混合设备中混合均匀成为预混料;
第二步,将着色剂研磨后过筛,成为细度≥200目的色粉;
第三步,将色粉放入烘干设备中保持温度60℃-65℃,去除色粉中所含水分;
第四步,二次混配:将定量的色粉与预混料放到混合设备中进行二次混配,确保混合均匀、充分,使之成为全混料;
第五步,在模具的空模内壁及芯轴上涂覆一层聚四氟乙烯,确保加热挤出管材时通畅润滑;
第六步,四温区加热挤出:将全混料经喂料口喂入柱塞式挤出机中,在柱塞的挤压过程中,全混料首先经过机体加热区进行110℃的加热,再经转接器加热区进行170℃的加热,随后经过连接盘进入模具的一段加温区进行190℃-220℃的一次加温,最后通过模具的二段加温区进行250℃-260℃二次加温后形成管材被挤出;
第七步,挤出的管材通过冷却水槽成型。
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