CN109385016B - CPVC (chlorinated polyvinyl chloride) composition for granulation-free injection molding - Google Patents

CPVC (chlorinated polyvinyl chloride) composition for granulation-free injection molding Download PDF

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CN109385016B
CN109385016B CN201710666545.XA CN201710666545A CN109385016B CN 109385016 B CN109385016 B CN 109385016B CN 201710666545 A CN201710666545 A CN 201710666545A CN 109385016 B CN109385016 B CN 109385016B
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cpvc
injection molding
polyethylene wax
composition
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CN109385016A (en
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姚敏捷
邱圣
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Shanghai Quanen Plastics Co ltd
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Shanghai Quanen Plastics 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
    • C08L23/26—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment
    • C08L23/28—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with halogens or compounds containing halogen
    • C08L23/286—Chlorinated polyethylene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • 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
    • 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
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four 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
    • C08L2207/066—LDPE (radical process)

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  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The invention discloses a CPVC (chlorinated polyvinyl chloride) composition for granulation-free injection molding, which consists of the following components in parts by weight: 100 parts of CPVC resin, 4-6 parts of stabilizer, 0.5-1.5 parts of low-density non-oxidized polyethylene wax, 0.5-1.5 parts of high-density oxidized polyethylene wax, 5-10 parts of impact modifier, 3-6 parts of processing aid, 1-1.5 parts of antioxidant and 2-5 parts of filler; the CPVC composition for granulation-free injection molding can be directly used for injection molding processing without a granulation process to obtain a product with good physical property and high smoothness.

Description

CPVC (chlorinated polyvinyl chloride) composition for granulation-free injection molding
Technical Field
The invention relates to the technical field of thermoplastic processing, in particular to a CPVC composition for granulation-free injection molding.
Background
Chlorinated polyvinyl chloride (CPVC) is a chlorinated product of polyvinyl chloride, which has superior physicochemical properties to polyvinyl chloride, with a chlorine content of about 58% in ordinary polyvinyl chloride (PVC) molecules and a chlorine content of 64-68% in chlorinated polyvinyl chloride molecules. The increased chlorine content improves the combustion-supporting property and smoke generation property of PVC, improves the tensile strength and modulus, and retains the original good properties: outstanding dimensional stability, excellent chemical resistance and weathering resistance, and good dielectric properties. However, the CPVC melt has the problem of high viscosity and is easy to decompose, so that the processing difficulty of CPVC injection molding products is greatly increased. Application publication No. CN 102190841A discloses a high-performance chlorinated polyvinyl chloride injection molding pellet, which is prepared from the following components in parts by weight: 100 parts of CPVC resin, 3-5 parts of stabilizer, 2-5 parts of lubricant, 5-12 parts of impact modifier, 0.5-5 parts of processing aid, 0-10 parts of filler and 0.1-2 parts of antioxidant, wherein the CPVC resin, the stabilizer, the lubricant, the antioxidant and the processing aid are prepared by mixing the components at a high speed to 100 ℃ and uniformly dispersing, cooling to 40-60 ℃, mixing the components, and extruding and pelletizing. The prepared granules have high strength, high temperature resistance and corrosion resistance, and are convenient for processing CPVC injection products.
The granules can be used for processing CPVC injection molding products, but the CPVC composition is subjected to a granulation process before injection molding, otherwise, the problem of poor plasticization degree exists during injection molding, and the physical properties and the smoothness of the products are affected. However, the granulation process increases the labor power of the enterprise, the input of equipment, and the energy consumption during production to some extent, and increases the production cost of the product. There is a need for a CPVC composition for pelletization-free injection molding that simplifies the processing of CPVC injection molded products.
Disclosure of Invention
In order to solve the problem that the CPVC composition needs to be granulated and preplasticized before injection molding in the prior art, the invention aims to provide a CPVC composition for injection molding without granulation.
In order to achieve the purpose, the invention adopts the following technical scheme: the CPVC composition for granulation-free injection molding comprises the following components in parts by weight: 100 parts of CPVC resin, 4-6 parts of stabilizer, 0.5-1.5 parts of low-density non-oxidized polyethylene wax, 0.5-1.5 parts of high-density oxidized polyethylene wax, 5-10 parts of impact modifier, 3-6 parts of processing aid, 1-1.5 parts of antioxidant and 2-5 parts of filler.
Low-density non-oxidized polyethylene wax: the density at 25 deg.C is 0.9-0.92g/cm3The polyethylene wax of (1); high-density oxidized polyethylene wax: the density at 25 deg.C is 0.96-0.98g/cm3The oxidized polyethylene wax is prepared by the oxidation process of polyethylene wax.
Wherein the CPVC resin is chlorinated polyvinyl chloride resin with the chlorine content of 65-68%.
Preferably, the stabilizer is an organotin thiol stabilizer.
More preferably, the stabilizer is a methyl mercaptan organotin, butyl mercaptan organotin, or octyl mercaptan organotin stabilizer.
Preferably, the low-density non-oxidized polyethylene wax is AC-617A.
Preferably, the high density oxidized polyethylene wax is AC-316A.
Preferably, the impact modifier is a methylmethacrylate-butadiene-styrene copolymer resin.
More preferably, the impact modifier is MBS TH-21.
Preferably, the processing aid is K-120P or PA-20.
Preferably, the antioxidant is antioxidant 1076.
Preferably, the filler is titanium dioxide.
Compared with the prior art, the invention has the following beneficial effects: the CPVC resin, the stabilizer, the low-density non-oxidized polyethylene wax, the high-density oxidized polyethylene wax, the impact modifier, the processing aid, the antioxidant and the filler are compounded to obtain the CPVC composition for granulation-free injection molding, and the obtained composition can be directly used for injection molding processing without a granulation process to obtain a product with good physical property and high smoothness.
Detailed Description
The CPVC resin, the stabilizer, the low-density non-oxidized polyethylene wax, the high-density oxidized polyethylene wax, the processing aid, the antioxidant and the filler are unchanged in type and dosage, different agents are respectively selected as impact modifiers, the selected components and dosage are shown in table 1, the obtained CPVC composition is subjected to injection molding processing, and the obtained product performance is shown in table 2.
TABLE 1
CPVC resin (100 parts) Stabilizer (4 parts) Low-density non-oxidized polyethylene wax (0.5 part) High-density oxidized polyethylene wax (0.5 part) Impact modifier (8 parts) Processing aid (2 parts) Antioxidant agent (1.5 parts) Filler (3) In weight portion)
Comparison of Example 1 With a chlorine content of 66% CPVC resin Octylmercaptan organotin stabilization Agent 17MOK AC-617A AC-316A ACR PA-101 PA-20 1076 Titanium white powder
Comparison of Example 2 —— —— —— —— CPE 135A —— —— ——
Comparison of Example 3 —— —— —— —— MBS TH-21 —— —— ——
TABLE 2
Density (kg/m)3） Vicat softening temperature DEG C Minimum tensile yield strength (MPa) Notched cantilever beam impact strength (type A, 23 ℃, kJ/m)2） Degree of gloss
Comparative example 1 1472 104.3 44.1 7.1 Height of
Comparative example 2 1471 104.5 47.7 8.0 Height of
Comparative example 3 1471 104.6 57.2 8.1 Height of
National standard 1450~1650 ≥103 ≥50 ≥8.1
As can be seen from Table 2, the CPVC composition obtained by using ACR as an impact modifier is good in processability by injection molding, and the prepared CPVC injection molding product has the Vicat softening temperature of 104.3 ℃, but the tensile yield strength and the impact strength of a notched cantilever beam are lower than the national standard and cannot be normally used; CPVC injection molding products prepared by selecting CPE as an impact modifier have improved impact strength of a gap cantilever arm, but still have low tensile yield strength which does not reach the national standard; the processing performance and the strength of the CPVC composition obtained by selecting MBS as an impact modifier reach the national standard.
The CPVC resin, the stabilizer, the impact modifier, the processing aid, the antioxidant and the filler are not changed in types and dosage, the low-density non-oxidized polyethylene wax and the high-density oxidized polyethylene wax are respectively or mixedly added, the selected components and dosage are shown in the table 3, and the performances of the obtained CPVC composition are shown in the table 4.
TABLE 3
CPVC resin Stabilizer Low density nonoxidizing polyethylene Olefin wax High density oxidized polyethylene Olefin wax Impact modifier Processing aid Antioxidant agent Filler
Comparison of Example 3 CPVC resin with chlorine content of 66 percent (100 parts) Octylmercaptan organotin stabilizers 17MOK (4 parts) AC-617A (0.5 parts) AC-316A (0.5 part) MBS TH-21（8 In weight portion) PA-20（2 In weight portion) 1076（1.5 In weight portion) Titanium dioxide (3) In weight portion)
Comparison of Example 4 CPVC resin with chlorine content of 66 percent (100 parts) Octylmercaptan organotin stabilizers 17MOK (4 parts) AC-617A (1 part) Is free of MBS TH-21（8 In weight portion) PA-20（2 In weight portion) 1076（1.5 In weight portion) Titanium dioxide (3) In weight portion)
Comparison of Example 5 CPVC resin with chlorine content of 66 percent (100 parts) Octylmercaptan organotin stabilizers 17MOK (4 parts) Is free of AC-316A (1 part) MBS TH-21（8 In weight portion) PA-20（2 In weight portion) 1076（1.5 In weight portion) Titanium dioxide (3) In weight portion)
TABLE 4
Density (kg/m)3） Vicat softening temperature DEG C Minimum tensile yield strength (MPa) Notched cantilever beam impact strength (type A, 23 ℃, kJ/m)2） Degree of gloss
Comparative example 3 1471 104.6 57.2 8.1 Height of
Comparative example 4 1471 104.5 46.2 7.7 Height of
Comparative example 5 1471 104.2 56.7 8.2 Is low in
National standard 1450-1650 ≥103 ≥50 ≥8.1
As can be seen from Table 4, in comparative example 4, the low-density non-oxidized polyethylene wax alone is used as a lubricant, so that the prepared CPVC product has high glossiness, but the tensile yield strength of the product is lower due to delayed plasticization, and the product performance is lower than the national standard; comparative example 5 the high-density oxidized polyethylene wax is used as a lubricant alone, so that the plasticization is accelerated, the Vicat softening temperature, the tensile yield strength and the impact strength of the notched cantilever beam of the product all reach the national standard, but the glossiness is reduced, and the application field of the CPVC product is reduced; comparative example 3 uses both low-density non-oxidized polyethylene wax and high-density oxidized polyethylene wax, which balances the gloss and performance of the product, and the comprehensive effect is better. Therefore, the low-density non-oxidized polyethylene wax and the high-density oxidized polyethylene wax are selected for compounding.
Example 1
1000 g of CPVC resin with 66 percent of chlorine content, 40g of methyl mercaptan organic tin stabilizer, 5g of AC-617A, 10g of AC-316A, 50g of impact modifier MBS TH-21, 30g of processing aid K-120P, 10g of antioxidant 1076 and 20g of titanium dioxide are put into a high-speed mixer, heated to 120 ℃, uniformly dispersed, discharged into a low-speed mixer, cooled to 40 ℃, discharged, and subjected to injection molding processing to obtain the product.
Example 2
1000 g of CPVC resin with 65 percent of chlorine content, 50g of butyl mercaptan organic tin stabilizer, 15g of AC-617A, 5g of AC-316A, 60g of impact modifier MBS TH-21, 50g of processing aid K-120P, 10g of antioxidant 1076 and 30g of titanium dioxide are put into a high-speed mixer, heated to 120 ℃, uniformly dispersed, discharged into a low-speed mixer, cooled to 40 ℃, discharged, and subjected to injection molding processing to obtain the product.
Example 3
1000 g of CPVC resin with 68 percent of chlorine content, 60g of octyl mercaptan organic tin stabilizer, 10g of AC-617A, 15g of AC-316A, 100g of impact modifier MBS TH-21, 60g of processing aid K-120P, 15g of antioxidant 1076 and 50g of titanium dioxide are put into a high-speed mixer, heated to 120 ℃, uniformly dispersed, discharged into a low-speed mixer, cooled to 40 ℃, discharged, and subjected to injection molding processing to obtain the product.
The CPVC injection-molded products obtained in examples 1 to 3 were subjected to the performance test, and the test results are shown in Table 5.
TABLE 5
Density kg/m3 Vicat softening temperature DEG C Tensile yield strength MPa Impact strength (type A) of notched suspension arm 23 ℃ (kJ/m)2） Degree of gloss
Example 1 1471 104.6 57.3 8.1 Height of
Example 2 1473 105.0 57.7 8.2 Height of
Example 3 1474 104.9 57.8 8.3 Height of
National standard 1450~1650 ≥103 ≥50 ≥8.1
The foregoing detailed description is given by way of example only, to better enable one of ordinary skill in the art to understand the patent, and is not to be construed as limiting the scope of what is encompassed by the patent; any equivalent alterations or modifications made according to the spirit of the disclosure of this patent are intended to be included in the scope of this patent.

Claims (6)

1. The CPVC composition for granulation-free injection molding is characterized by comprising the following components in parts by weight: 100 parts of CPVC resin, 4-6 parts of stabilizer, 0.5-1.5 parts of low-density non-oxidized polyethylene wax, 0.5-1.5 parts of high-density oxidized polyethylene wax, 5-10 parts of impact modifier, 3-6 parts of processing aid, 1-1.5 parts of antioxidant and 2-5 parts of filler;
wherein the low-density non-oxidized polyethylene wax is AC-617A; the high-density oxidized polyethylene wax is AC-316A; the impact modifier is MBS TH-21.
2. A CPVC composition for pelletization-free injection molding according to claim 1, wherein the CPVC resin is a chlorinated polyvinyl chloride resin having a chlorine content of 65 to 68%.
3. A CPVC composition for pelletization-free injection molding according to claim 1, wherein the stabilizer is an organotin thiol stabilizer.
4. A CPVC composition for pelletization-free injection molding according to claim 3, wherein the stabilizer is an organotin methyl mercaptan, organotin butyl mercaptan or organotin octyl mercaptan stabilizer.
5. A CPVC composition for pelletization-free injection molding according to claim 1, wherein the processing aid is K-120P or PA-20.
6. A CPVC composition for pelletization-free injection molding according to claim 1, wherein the antioxidant is antioxidant 1076.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103923420A (en) * 2014-03-25 2014-07-16 潍坊高信化工科技有限公司 CPVC used for nontoxic and high Vicat cold hot water and its preparation method
CN104927262A (en) * 2015-06-03 2015-09-23 江苏天腾化工有限公司 Chlorinated polyvinyl chloride pipe and preparation method thereof
CN105348705A (en) * 2015-10-30 2016-02-24 永高股份有限公司 Preparation method of CPVC for nontoxic and high-processing stability cold and hot water

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101678724B1 (en) * 2013-12-06 2016-11-22 주식회사 엘지화학 Thermoplastic resin composition and molded article obtained from the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103923420A (en) * 2014-03-25 2014-07-16 潍坊高信化工科技有限公司 CPVC used for nontoxic and high Vicat cold hot water and its preparation method
CN104927262A (en) * 2015-06-03 2015-09-23 江苏天腾化工有限公司 Chlorinated polyvinyl chloride pipe and preparation method thereof
CN105348705A (en) * 2015-10-30 2016-02-24 永高股份有限公司 Preparation method of CPVC for nontoxic and high-processing stability cold and hot water

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