CN103102559A - LDPE (Low-density polyethylene)/EVA (ethylene-vinyl acetate copolymer)/SBR (styrene butadiene rubber) composite foam material and preparation method thereof - Google Patents

Abstract

The invention discloses an LDPE (low-density polyethylene)/EVA (ethylene-vinyl acetate copolymer)/SBR (styrene butadiene rubber) composite foam material. The foam material is prepared from the following raw materials in parts by weight: 80-100 parts of LDPE, 30-40 parts of EVA, 20-30 parts of SBR, 10-20 parts of talcum powder, 10-15 parts of nanometer celestite powder, 2-3 parts of bis(dioctyl pyrophosphate) ethylene titanate, 1-2 parts of anilino-methyl-triethoxysilane, 5-10 parts of magnesium hydroxide, 5-8 parts of azodicarbonamide, 5-8 parts of dioctyl maleate, 1-1.5 parts of benzoyl peroxide, 2-3 parts of zinc oxide, 1-2 parts of stearic acid, 1-2 parts of dioctyltin bis(isooctylmercaptoacetate), 2-3 parts of chlorinated polyethylene, 3-5 parts of modified wood ash, 1-2 parts of ultraviolet light absorber UV-360 and 2-3 parts of antioxidant 246. The produced LDPE foam material is light and soft, has high strength, good resilience, an ideal foaming effect, uniform, fine and dense pores and good flame retardance, is resistant to chemical corrosion and aging and is durable in use.

Description

A kind of LDPE/EVA/SBR composite foam material and preparation method thereof

Technical field

The invention belongs to field of high polymer material processing, be specifically related to a kind of LDPE/EVA/SBR composite foam material and preparation method thereof.

Background technology

The Low Density Polyethylene foam material has excellent physics, chemistry and mechanical property.It is tough, and flexibility is good, and abrasion performance has excellent electrical insulating property, and thermal insulation and chemical resistant properties are widely used in many fields such as packing, chemical industry, building.But the Low Density Polyethylene foam material also exists the shortcomings such as intensity is low, rebound resilience is poor, abscess is inhomogeneous at present, so it is soft that one of developing direction of Low Density Polyethylene foam material is exploitation, flexibility is high, intensity is high, abscess is even, the closed-cell foam grade of tiny densification, simultaneously, each field also proposes corresponding requirement to plastic material fire-retardant.

Summary of the invention

The object of the invention is to for the deficiencies in the prior art, a kind of excellent mechanical properties that has is provided, LDPE/EVA/SBR composite foam material of good flame resistance and environment-protecting asepsis and preparation method thereof.

For achieving the above object, the technical solution used in the present invention is as follows:

a kind of LDPE/EVA/SBR composite foam material, raw material by following weight part is made: LDPE 80-100, EVA 30-40, SBR 20-30, talcum powder 10-20, nanometer celestite powder 10-15, Di(dioctylpyrophosphato) ethylene titanate 2-3, anilinomethyl triethoxysilane 1-2, magnesium hydroxide 5-10, Cellmic C 121 5-8, dioctyl maleate 5-8, benzoyl peroxide 1-1.5, zinc oxide 2-3, stearic acid 1-2, Imarcaptoacetate dioctyltin 1-2, chlorinatedpolyethylene 2-3, modification trees ash 3-5, UV light absorber UV-360 1-2, oxidation inhibitor 246 2-3.

Described modification trees ash is made by following methods: first boil trees ash 20-30min with the 10-15% sodium hydroxide solution, use again distilled water rinsing Ex-all alkali, be placed in the drying in oven of 110-120 ℃, add the silane resin acceptor kh-550 that is equivalent to trees ash weight 2-3%, the polyisobutene of 1-2%, the sodium laurylsulfate of 2-3%, the nano silicon of 3-5%, stir 2-3h 100-110 ℃ of water-bath high speed, oven dry, pulverizing grinds to form ultrafine powder and gets final product.

The preparation method of LDPE/EVA/SBR composite foam material comprises the following steps:

(1) will add in the high-speed kneading machine with Di(dioctylpyrophosphato) ethylene titanate after the talcum powder drying, speed with 500-800rpm under 110-120 ℃ mixes 20-30min, add again EVA speed melt blending 10-20min with 1000-1500rpm under 100-110 ℃, compound is moved into extruding pelletization in forcing machine, be cooled to normal temperature and namely get the talcum powder particle that EVA coats, standby;

(2) will add in the high-speed kneading machine with anilinomethyl triethoxysilane after nanometer celestite powder drying, speed with 500-800rpm under 105-110 ℃ mixes 15-25min, add again SBR speed melt blending 10-15min with 1000-1500rpm under 95-100 ℃, compound is moved into extruding pelletization in forcing machine, be cooled to normal temperature and namely get the nanometer celestite powder particle that SBR coats, standby;

(3) add in Banbury mixer together with the talcum powder particle that LDPE and the above-mentioned EVA that makes is coated, the nanometer celestite powder particle that SBR coats, then mixing 5-8min under 110-120 ℃ adds the remaining raw material such as magnesium hydroxide, azoformamide potassium formiate, dioctyl maleate to continue mixing 10-15min discharging successively;

(4) above-mentioned material after mixing is moved into rapidly in open refining broken-(down)rubber machine thin refining 2-5 time, thickness 5-8mm, temperature is controlled at 95-105 ℃, then is cut into the sheet stock of required size, weighing;

(5) appropriate sheet stock is added in the mould of preheating, is forced into 8-10MPa at ℃ temperature of 160-170 on vulcanizing press, pressurize 10-15min removes foam, is cooled to normal temperature and namely gets LDPE/EVA/SBR composite foam material of the present invention.

Beneficial effect of the present invention:

The present invention is by carrying out modification to the trees ash, obviously improved the interface binding intensity of trees ash with Low Density Polyethylene, under external force, modification trees grey particle plays the effect of bearing stress and dispersive stress effectively in foam material, and bring out matrix resin generation plastic deformation, thereby the mechanical properties such as tensile strength, shock strength and modulus in flexure of foam material have been improved.The present invention passes through formula adjustment and process modification, utilize EVA to coat modified talc powder and SBR coating modified Nano celestite powder, talcum powder, nanometer celestite powder and poly consistency be can obviously improve, thereby physical strength and the hardness of foam material improved.LDPE/EVA/SBR composite foam material light weight that the present invention produces is soft, intensity is high, rebound resilience good, and foaming effect is desirable, abscess is even, tiny densification, good flame resistance, and resistance to chemical attack is ageing-resistant, durable in use.

Embodiment

Embodiment

a kind of LDPE/EVA/SBR composite foam material, raw material by following weight part is made: 95 parts of LDPE, 25 parts of EVA, 25 parts of SBR, 15 parts of talcum powder, 15 parts of nanometer celestite powders, 2.5 parts of Di(dioctylpyrophosphato) ethylene titanate, 2 parts of anilinomethyl triethoxysilanes, 6 parts of magnesium hydroxides, 8 parts of Cellmic C 121s, 7 parts of dioctyl maleates, 1.5 parts of benzoyl peroxides, 2 parts, zinc oxide, 1.5 parts of stearic acid, 1.5 parts of Imarcaptoacetate dioctyltins, 2 parts of chlorinatedpolyethylenees, 4 parts of modification trees ashes, 2 parts of UV light absorber UV-360, 246 2 parts, oxidation inhibitor.

Wherein, described modification trees ash is made by following methods: first boil trees ash 30min with 10% sodium hydroxide solution, use again distilled water rinsing Ex-all alkali, be placed in the drying in oven of 110 ℃, add the silane resin acceptor kh-550 that is equivalent to trees ash weight 2%, 1.5% polyisobutene, 2.5% sodium laurylsulfate, 4% nano silicon, stir 3h 105 ℃ of water-bath high speeds, oven dry, pulverizing grinds to form ultrafine powder and gets final product.

The preparation method of LDPE/EVA/SBR composite foam material comprises the following steps:

(1) will add in the high-speed kneading machine with Di(dioctylpyrophosphato) ethylene titanate after the talcum powder drying, speed with 700rpm under 118 ℃ mixes 25min, add again EVA speed melt blending 20min with 1100rpm under 105 ℃, compound is moved into extruding pelletization in forcing machine, be cooled to normal temperature and namely get the talcum powder particle that EVA coats, standby;

(2) will add in the high-speed kneading machine with anilinomethyl triethoxysilane after nanometer celestite powder drying, speed with 600rpm under 110 ℃ mixes 20min, add again SBR speed melt blending 15min with 1200rpm under 100 ℃, compound is moved into extruding pelletization in forcing machine, be cooled to normal temperature and namely get the nanometer celestite powder particle that SBR coats, standby;

(3) add in Banbury mixer together with the talcum powder particle that LDPE and the above-mentioned EVA that makes is coated, the nanometer celestite powder particle that SBR coats, then mixing 6min under 120 ℃ adds the remaining raw material such as magnesium hydroxide, azoformamide potassium formiate, dioctyl maleate to continue mixing 10min discharging successively;

(4) above-mentioned material after mixing is moved into rapidly in open refining broken-(down)rubber machine thin refining 3 times, thickness 8mm, temperature is controlled at 105 ℃, then is cut into the sheet stock of required size, weighing;

(5) appropriate sheet stock is added in the mould of preheating, in being forced into 8MPa at 170 ℃ of temperature on vulcanizing press, pressurize 15min removes foam, is cooled to normal temperature and namely gets LDPE/EVA/SBR composite foam material of the present invention.

The performance test of the LDPE/EVA/SBR composite foam material that the present embodiment is produced is as shown in the table:

Test item	Result
		Tensile strength (MPa)	6.5
Impact rebound degree (%)	42
		Tear strength (kNm -1）	124
Elongation at break (%)	192
		Compression set (%)	23.3

Claims (3)

1. LDPE/EVA/SBR composite foam material, it is characterized in that, raw material by following weight part is made: LDPE 80-100, EVA 30-40, SBR 20-30, talcum powder 10-20, nanometer celestite powder 10-15, Di(dioctylpyrophosphato) ethylene titanate 2-3, anilinomethyl triethoxysilane 1-2, magnesium hydroxide 5-10, Cellmic C 121 5-8, dioctyl maleate 5-8, benzoyl peroxide 1-1.5, zinc oxide 2-3, stearic acid 1-2, Imarcaptoacetate dioctyltin 1-2, chlorinatedpolyethylene 2-3, modification trees ash 3-5, UV light absorber UV-360 1-2, oxidation inhibitor 246 2-3.

2. LDPE/EVA/SBR composite foam material according to claim 1, it is characterized in that, described modification trees ash is made by following methods: first boil trees ash 20-30min with the 10-15% sodium hydroxide solution, use again distilled water rinsing Ex-all alkali, be placed in the drying in oven of 110-120 ℃, add the silane resin acceptor kh-550 that is equivalent to trees ash weight 2-3%, the polyisobutene of 1-2%, the sodium laurylsulfate of 2-3%, the nano silicon of 3-5%, stir 2-3h 100-110 ℃ of water-bath high speed, oven dry, pulverizing grinds to form ultrafine powder and gets final product.

3. the preparation method of a LDPE/EVA/SBR composite foam material as claimed in claim 1 is characterized in that comprising the following steps:

(1) will add in the high-speed kneading machine with Di(dioctylpyrophosphato) ethylene titanate after the talcum powder drying, speed with 500-800rpm under 110-120 ℃ mixes 20-30min, add again EVA speed melt blending 10-20min with 1000-1500rpm under 100-110 ℃, compound is moved into extruding pelletization in forcing machine, be cooled to normal temperature and namely get the talcum powder particle that EVA coats, standby;

(2) will add in the high-speed kneading machine with anilinomethyl triethoxysilane after nanometer celestite powder drying, speed with 500-800rpm under 105-110 ℃ mixes 15-25min, add again SBR speed melt blending 10-15min with 1000-1500rpm under 95-100 ℃, compound is moved into extruding pelletization in forcing machine, be cooled to normal temperature and namely get the nanometer celestite powder particle that SBR coats, standby;

(3) add in Banbury mixer together with the talcum powder particle that LDPE and the above-mentioned EVA that makes is coated, the nanometer celestite powder particle that SBR coats, then mixing 5-8min under 110-120 ℃ adds the remaining raw material such as magnesium hydroxide, azoformamide potassium formiate, dioctyl maleate to continue mixing 10-15min discharging successively;

(4) above-mentioned material after mixing is moved into rapidly in open refining broken-(down)rubber machine thin refining 2-5 time, thickness 5-8mm, temperature is controlled at 95-105 ℃, then is cut into the sheet stock of required size, weighing;

(5) appropriate sheet stock is added in the mould of preheating, is forced into 8-10MPa at ℃ temperature of 160-170 on vulcanizing press, pressurize 10-15min removes foam, is cooled to normal temperature and namely gets LDPE/EVA/SBR composite foam material of the present invention.