GB2610017A - Preparation method of ethylene propylene rubber (EPR) powder-based ethylene-vinyl acetate (EVA) anti-aging thermoplastic elastomer (TPE) seal for water pipe - Google Patents

Preparation method of ethylene propylene rubber (EPR) powder-based ethylene-vinyl acetate (EVA) anti-aging thermoplastic elastomer (TPE) seal for water pipe Download PDF

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GB2610017A
GB2610017A GB2207367.0A GB202207367A GB2610017A GB 2610017 A GB2610017 A GB 2610017A GB 202207367 A GB202207367 A GB 202207367A GB 2610017 A GB2610017 A GB 2610017A
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epr
powder
rubber
eva
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Wang Yanqiu
Zhu Muwei
Liu Taichuang
Weng Guowen
Liu Feng
Zang Yanan
Jin Ling
Yao Liang
Zhang Xiaoping
Xu Yunhui
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Xuzhou College of Industrial Technology
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    • 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
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    • C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
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    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • C08L23/08—Copolymers of ethene
    • C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
    • C08L23/0853—Vinylacetate
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    • C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
    • C09D123/02—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D123/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
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    • C08L2203/00—Applications
    • C08L2203/18—Applications used for pipes
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Abstract

A preparation of an ethylene propylene rubber (EPR) powder-based ethylene vinyl acetate (EVA) anti-aging thermoplastic elastomer (TPE) seal for a water pipe, comprising EVA copolymer (15-20 parts), cis-1,4-polybutadiene (cis-1,4-PB) rubber (10-20 parts), waste EPR powder (60-70 parts), regeneration activator (2 parts), pine tar (15 parts), compatibilizer (0.8-1.3 parts), vulcanizer (0.3 parts), zinc oxide (5 parts), stearic acid (0.3 parts), antioxidant (0.3 parts); wherein the preparation method comprises: step 1) conduct activation of the waste EPR at 200 °C for 30 minutes; step 2) conduct plasticisation of the cis-1,4-PB rubber for 5 minutes at room temperature, and disperse in the activated EPR powder and the EVA copolymer to obtain a dispersion, which is added to cis-1,4-PB at 160±5 °C, adding regeneration activator, pine tar; step 3) adding the remaining ingredients and the composite plasticated rubber to a twin-screw extruder at 180 °C, dispersing evenly, cross-linking by dynamic cross-linking system and mechanical shear stress to obtain EPR powder-based EVA TPE seal for a water pipe, and conducting mold pressing to obtain sheets. The vulcanizer may be sulfur. The compatibilizer may be di-tert-butyl dicumyl peroxide.

Description

PREPARATION METHOD OF ETHYLENE PROPYLENE RUBBER (EPR) POWDER-BASED ETHYLENE-VINYL ACETATE (EVA) ANTI-AGING THERMOPLASTIC ELASTOMER (TPE) SEAL FOR WATER PIPE
TECHNICAL FIELD
100011 The present disclosure relates to the technical field of polymer material preparation, in particular to a preparation method of an ethylene propylene rubber (EPR) powder-based ethylene-vinyl acetate (EVA) anti-aging thermoplastic elastomer (TPE) seal.
BACKGROUND ART
[0002] Thermoplastic elastomers (TPEs) play an increasingly important role in the application of rubber products, resulting in a significantly increased demand. To reduce the cost of TPEs, increase the recycling of waste tires, and promote the promotion and application of TPEs, people have researched and developed rubber powder-based thermoplastic elastomers (RPTPEs). The RPTPE is prepared by blending rubber powder and thermoplastic resin, with simple processing and low processing cost; in addition, the rubber powder has a low cost and large dosage (generally accounting for 50% to 90% of a total mass), thereby greatly reducing the cost of the TPEs. Moreover, the rubber powder can be made from waste tires, which provides a new way to solve "black pollution" caused by the waste tires; furthermore, the TPEs can be recycled and are in line with the sustainable development path in China. Therefore, the RPTPEs have a desirable development prospect.
[0003] At present, the RPTPEs have poor mechanical properties, poor performance stability, and high cost during production, and are not suitable for making high-end products due to a strong smell.
SUMMARY
[0004] A purpose of the present disclosure is to provide a preparation method of an EPR powder-based EVA anti-aging TPE seal. The seal has a low cost and excellent performance. [0005] To achieve the above purpose, the present disclosure provides a preparation method of an EPR powder-based EVA anti-aging TPE seal, where the seal is prepared by the following raw materials in parts by weight: [0006] 15 parts to 20 parts of an EVA copolymer, [0007] 10 parts to 20 parts of a ci s-1,4-pol ybutadiene (cis-1,4-PB) rubber, [0008] 60 parts to 70 parts of a waste EPR powder, 100091 2.0 parts of a regeneration activator 510, 100101 15.0 parts of pine tar, [0011] 0.8 parts to 1.3 parts of a compatibilizer, [0012] 0.3 parts of a vulcanizer, [0013] 5.0 parts of zinc oxide, 100141 0.3 parts of stearic acid, and 100151 0.3 parts of an antioxidant 1010, and 100161 the preparation method includes the following steps: 100171 step 1), conducting activation on the waste EPR powder at 200°C for 30 min; [0018] step 2), conducting plastication on the cis-1,4-PB rubber for 5 min at room temperature to obtain a plasticated cis-1,4-PB rubber, uniformly dispersing an activated waste EPR powder obtained in step 1) and the EVA copolymer in a kneader to obtain a dispersion system, adding the dispersion system into the plasticated cis-1,4-PB rubber at 160°C ± 5°C, adding the regeneration activator and the pine tar, and mixing evenly to obtain a composite plasticated rubber; and [0019] step 3), adding the composite plasticated rubber, the vulcanizer, the compatibilizer, the zinc oxide, the stearic acid, and the antioxidant 1010 to a twin-screw extruder at 180°C, dispersing evenly, conducting a cross-linking reaction by a dynamic cross-linking system and a strong mechanical shear stress to obtain an EPR powder-based EVA TPE seal for a water pipe, and conducting mold pressing to obtain sheets.
100201 Preferably, the waste EPR powder may have a particle size of greater than or equal to 100 mesh.
[0021] Preferably, the EVA copolymer may be a granular solid.
100221 Preferably, the vulcanizer may be sulfur.
100231 Preferably, the compatibilizer may be di-tert-butyl dicumyl peroxide.
[0024] Compared with the prior art, the present disclosure has the following beneficial effects: [0025] (1) The EPR powder-based EVA anti-aging TPE seal for a water pipe has a tensile strength up to 10.5 IVIPa, an elongation at break up to 778%, and a Shore hardness up to 54 to 59; the TPE has a compression set of 17.90% to 24.53% and a water resistance of 2.28% to 4.12%; and the TPE has a hardness change in aging resistance and thermal oxidation aging resistance of +1 to +5, a strength change rate of -4.85% to 5.69%, and elongation change rate of 4.66% to 11.18%, an excellent ozone aging resistance, and no cracks.
[0026] (2) An activated EPDN4 rubber powder of 100 mesh and above is used; the fine EPR powder of more than 100 mesh is easier to disperse evenly than the EPR, the EVA and the cis1,4-PB rubber, and is not easy to stick to the screw during the dynamic cross-linking, without pollution. The EPR powder-based EVA TPE seal for a water pipe has an excellent comprehensive performance.
[0027] (3) The easily dispersible property of waste rubber powder is fully utilized to solve the environmental pollution caused by waste EPR being directly discarded, and the waste EPR is turned waste into treasure; a raw material cost is reduced by 45% to 55%, a profit of EPDM RP/EVA TPE is increased by not less than 100% compared to that of EPDM/EVA TPE
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0028] The disclosure is further described below with reference to examples.
[0029] Example 1
[0030] A waste EPR powder of 21 Kg and greater than or equal to 100 mesh was activated at 200°C for 30 min. [0031] 4.5 Kg of a cis-1,4-PB rubber was plasticated at room temperature for 5 min to obtain a plasticated cis-1,4-PB rubber, and an activated fine EPR powder and 4.5 Kg of transparent EVA particles were uniformly dispersed in a kneader to obtain a mixture; the mixture was added to the plasticated cis-1,4-PB rubber at 160°C ± 5°C, and mixed evenly to obtain a composite plasticated rubber.
[0032] 0.09 Kg of sulfur, 0.33 Kg of a compatibilizer 13[13P, 1.5 Kg of zinc oxide, 0.09 Kg of stearic acid, and 0.09 Kg of an antioxidant 1010 were added to the composite plasticated rubber in a twin-screw extruder at 180°C, and dispersed evenly, a cross-linking reaction was conducted by a dynamic cross-linking system and a strong mechanical shear stress to obtain an EPR powder-based EVA TPE seal for a water pipe, and mold pressing was conducted to obtain sheets. [0033] Example 2 [0034] A waste EPR powder of 21 Kg and greater than or equal to 100 mesh was activated at 200°C for 30 min. [0035] 3.0 Kg of a cis-1,4-PB rubber was plasticated at room temperature for 5 min to obtain a plasticated cis-1,4-PB rubber, and an activated fine EPR powder and 6.0 Kg of transparent EVA particles were uniformly dispersed in a kneader to obtain a mixture; the mixture was added to the plasticated cis-1,4-PB rubber at 160°C ± 5°C, and mixed evenly to obtain a composite plasticated rubber.
[0036] 0.09 Kg of sulfur, 0.33 Kg of a compatibilizer B113P, 1.5 Kg of zinc oxide, 0.09 Kg of stearic acid, and 0.09 Kg of an antioxidant 1010 were added to the composite plasticated rubber in a twin-screw extruder at 180°C, and dispersed evenly, a cross-linking reaction was conducted by a dynamic cross-linking system and a strong mechanical shear stress to obtain an EPR powder-based EVA TPE seal for a water pipe, and mold pressing was conducted to obtain sheets. [0037] Example 3 100381 A waste EPR powder of 18 Kg and greater than or equal to 100 mesh was activated at 200°C for 30 min. [0039] 6.0 Kg of a cis-1,4-PB rubber was plasticated at room temperature for 5 min to obtain a plasticated cis-1,4-PB rubber, and an activated fine EPR powder and 6.0 Kg of transparent EVA particles were uniformly dispersed in a kneader to obtain a mixture; the mixture was added to the plasticated cis-1,4-PB rubber at 160°C ± 5°C, and mixed evenly to obtain a composite plasticated rubber.
100401 0.09 Kg of sulfur, 0.33 Kg of a compatibilizer BB3P, 1.5 Kg of zinc oxide, 0.09 Kg of stearic acid, and 0.09 Kg of an antioxidant 1010 were added to the composite plasticated rubber in a twin-screw extruder at 180°C, and dispersed evenly, a cross-linking reaction was conducted by a dynamic cross-linking system and a strong mechanical shear stress to obtain an EPR powder-based EVA TPE seal for a water pipe, and mold pressing was conducted to obtain sheets. [0041] Performance testing was conducted according to GB/T21874-2008.
[0042] Table 1 Performances of EPR powder-based EVA TPE seal for water pipe [0043] Example GB/121874-2008 Example 1 Example 2 Example 3 Test cm Shore hardness 50+5 s < hardness <70+5 55 58 59 Tensile strength/Iv/Pa >3.0 6.02 6.14 8.67 Elongation at breald% >300 631.68 664 778 Compression set/% (23°C, 72 h) 95 20.59 24.53 21.12 Hot air aging at 70°C for 7 d, then 15 I 5 I 4 IS Hardness change, max/min I 10 12,95 -5.69 -0.77 Tensile strength change rate, max/min +15 +9,99 +8,42 +5,97 Elongation at break change rate. max/min Ozone resistance No crack observed without crack No crack No crack magnfication Volume change in water/5% (70°C, 7 d) -1 to I 8 3.53 4.12 3.16 [0044] As can be seen from Table 1, performance indicators of the EPR powder-based EVA TPE seal for a water pipe have reached or even far exceeded requirements in the national standard GB/T21874-2008 "Elastomeric Seals-Requirements for Materials for Pipe Joint Seals Used in Water and Drainage Applications-Thermoplastic El astomers".

Claims (5)

  1. CLAIMS1. A preparation method of an ethylene propylene rubber (EPR) powder-based ethylene-vinyl acetate (EVA) anti-aging thermoplastic elastomer (TPE) seal for a water pipe, wherein the seal is prepared by the following raw materials in parts by weight: parts to 20 parts of an EVA copolymer, parts to 20 parts of a cis-1,4-polybutadiene (cis-1,4-PB) rubber, parts to 70 parts of a waste EPR powder, 2.0 parts of a regeneration activator 510, 15.0 parts of pine tar, 0.8 parts to 1.3 parts of a compatibilizer, 0.3 parts of a vulcanizer, 5.0 parts of zinc oxide, 0.3 parts of stearic acid, and 0.3 parts of an antioxidant 1010; and the preparation method comprises the following steps: step 1), conducting activation on the waste EPR powder at 200°C for 30 min; step 2), conducting plastication on the cis-I,4-PB rubber for 5 min at room temperature to obtain a plasticated cis-1,4-PB rubber, uniformly dispersing an activated waste EPR powder obtained in step 1) and the EVA copolymer in a kneader to obtain a dispersion system, adding the dispersion system into the plasticated cis-1,4-PB rubber at 160°C ± 5°C, adding the regeneration activator and the pine tar, and mixing evenly to obtain a composite plasticated rubber; and step 3), adding the composite plasticated rubber, the vulcanizer, the compatibilizer, the zinc oxide, the stearic acid, and the antioxidant 1010 to a twin-screw extruder at 180°C, dispersing evenly, conducting a cross-linking reaction by a dynamic cross-linking system and a strong mechanical shear stress to obtain an EPR powder-based EVA TPE seal for a water pipe, and conducting mold pressing to obtain sheets.
  2. 2 The preparation method of an EPR powder-based EVA anti-aging TPE seal for a water pipe according to claim 1, wherein the waste EPR powder has a particle size of greater than or equal to 100 mesh.
  3. 3. The preparation method of an EPR powder-based EVA anti-aging TPE seal for a water pipe according to claim 1, wherein the EVA copolymer is a granular solid.
  4. 4. The preparation method of an EPR powder-based EVA anti-aging TPE seal for a water pipe according to claim 1, wherein the vulcanizer is sulfur.
  5. 5. The preparation method of an EPR powder-based EVA anti-aging TPE seal for a water pipe according to claim 1, wherein the compatibilizer is di-tert-butyl dicumyl peroxide
GB2207367.0A 2021-08-18 2022-05-19 Preparation method of ethylene propylene rubber (EPR) powder-based ethylene-vinyl acetate (EVA) anti-agin thermoplastic elastomer (TPE) seal for water pipe Active GB2610017B (en)

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CN118085509A (en) * 2024-03-25 2024-05-28 广东科悦新材料有限公司 Composite TPE material and preparation method thereof

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