CN1276393A - Composition used for fire resistant industrial wall slab and its production technology - Google Patents
Composition used for fire resistant industrial wall slab and its production technology Download PDFInfo
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Abstract
A composition used for fire resistant industrial wall slab is prepared from PVC, thermal stabilizer, plasticizer, flame retardant, lubricant and filler through high-speed kneading, granulating and extruding for shaping. Its advantges are high strength and toughness, high resistance to ageing, fire and water, and good heat and sound insulation.
Description
The present invention relates to a kind of polymer building material composition.More particularly, the present invention relates to a kind of thermoplastic material, and can be widely used in all kinds of skeleton construction pad goods for building, if can alternative metals and the pad body of wall of glass fiber reinforced plastics product.Described goods have characteristics such as intensity height, good toughness, anti-aging, fire-retardant, waterproof, insulation, sound insulation.The invention still further relates to the preparation method of said composition.
In recent years, plastic material has become a kind of type material that widely uses in the domestic and international decoration industry.But the limitation owing to its performance often can only be applied on the upholstery of covil construction, and as all kinds of skeleton construction pad bodies of wall in the building, still based on metal and glass fiber reinforced plastics product.Because the cost height of metal and glass fiber reinforced plastics product, difficulty of construction is also bigger, also has many defectives in the maintenance; Therefore, an urgent demand up to now improves the performance of existing thermoplastic material composition, makes it can be used for all kinds of skeleton construction pad bodies of wall of building.
At present, along with the development of polymer technology, constantly proposed this thermoplastic material performance is carried out improved new composition and manufacture method.As Chinese patent application number is 93114981.9, publication number is CN1087101A, denomination of invention is in " preparation technologies of a kind of thermoplastic elastomer of polyvinyl-chloride and goods thereof " documents and materials, proposed in polyvinyl chloride (PVC) to add materials such as corresponding properties-correcting agent, softening agent and stablizer, made the composition after the modification have elasticity, erosion resistance and low temperature reelability.And for example Chinese patent application number is 87104669.5, publication number is CN1030597A, denomination of invention is in the documents and materials of " flame-retardant plastic composition and the goods made from the reorganization compound ", proposed equally to add materials such as corresponding properties-correcting agent, softening agent and stablizer in polyvinyl chloride (PVC), the product of making has advantages such as in light weight, corrosion-resistant, anti-aging.Yet, though the performance of above-mentioned composition has had very big improvement and raising, but its intensity and combustionproperty also do not reach specified standards, and especially the smoke density grade standard requires than higher, far can not all kinds of under construction skeleton construction pad bodies of wall in widespread use.
Purpose of the present invention just is to provide a kind of existing thermoplastic materials performance is further improved, have characteristics such as intensity height, good toughness, anti-aging, fire-retardant, waterproof, insulation, sound insulation, can be widely used in all kinds of skeleton construction pad body of wall compositions for building, to substitute corresponding articles such as present metal, glass reinforced plastic.For this reason, the present invention also will provide a kind of method of making said composition.
As all kinds of skeleton construction pad body of wall PVC compositions that can be widely used in industry and the covil construction, not only require to have very high intensity, good toughness, and quality wants gently can be fire-retardant, insulation, sound insulation and prevent to wear out.
Discover, polyvinyl chloride (PVC), though itself just have many good performances, as have certain fire-retardantly, anti-aging, corrosion-resistant, melt viscosity is moderate; But the intermolecular magnetism of polarity PVC is strong, so be difficult to dissolve and flow, makes goods hard.And add a certain amount of softening agent, make in the softening agent polarity gene in the effect of PVC molecule Semi-polarity gene generation dipolar forces, make its molecule " insertion " between the PVC molecular chain, nonpolar moieties in the intermolecular plasticizer molecule of PVC, can play and stop the approaching of PVC molecule, thereby increase intermolecular distance, reduce magnetism, the motion ratio of PVC molecular chain is easier to.Therefore, add also and control plasticizer dosage effectively, just can improve tensile strength, thermotolerance and the shock strength of polyvinyl chloride (PVC) goods greatly.
Simultaneously, polyvinyl chloride is under sun exposure, and its chemical bond is subject to daylight ultraviolet ray and destroys, thereby yellowing occurs, become fragile, chap, catabiosis such as surface staining.Be to improve the anti-uv-ray of goods, experiment showed, that adding certain amount of stabilizer can extensively absorb ultraviolet ray, make the ageing resistance of goods be extended down to 30～50 years constant.
Find simultaneously, aluminium hydroxide with fire retardation, it mainly is the a-alumina trihydrate, its crystalline structure is to have closelypacked hydroxyl ion to constitute in the mode of AB bilayer, and aluminum ion is among the hydroxyl ion of above-mentioned accumulation, in formed octahedral interstices, there is 2/3rds space to be occupied by aluminum ion, remaining space is empty.For six OH ions of each aluminum ion coordination, this closelypacked hydroxyl ion just constitutes a kind of laminate structure, is connected with the formed hydrogen bond of hydroxyl ion between adjacent two layers.The aluminium hydroxide decomposes becomes AL
2O
3And water, the caloric receptivity of reaction can reach 1967.2KJ/kg.Absorbing big like this heat is that aluminium hydroxide can be as the main characteristic of fire retardant use.The increase of aluminium hydroxide add-on experiment showed, that aluminium hydroxide dewaters obviously when 210 ℃ of left and right sides, along with can strengthen quickly and effectively to the flame retardant of plastic performance.
The flame retardancy that experiment showed, hard PVC has reached the UL94V-0 level.Hydration zinc borate (FB fire retardant) is a kind of inorganic additive flame retardant.Molybdic oxide not only has flame retardant properties, presses down hood but also have concurrently.If with aluminium hydroxide and zinc borate and usefulness, can reach the flame retardant properties of higher standard.Therefore, in hard PVC, add fire retardants such as aluminium hydroxide and hydration zinc borate, can not only strengthen flame retardant properties, but also good smoke elimination effect will be arranged.
In other words, for further improving the intensity and the flame retardant properties of thermoplastic materials, reduce smoke density, be on the basis of composition base with polyvinyl chloride (PVC), add corresponding softening agent, fire retardant, stablizer, properties-correcting agent and processing aid etc., just can make difficult combustion PVC industrial wall slab composition.
Concrete composition content is as follows:
Polyvinyl chloride (PVC) is 100 parts (by weight);
Complex lead salt stabilizer is 4～6 parts (weight);
Chlorinatedpolyethylene (CPE) is 4～6 parts (weight);
Stearic acid is 0.15～0.5 part (weight);
O-phthalic acid dibutyl ester (DOP) is 2～4 parts (weight);
Zinc borate is 3～6 parts (weight);
Molybdic oxide is 4～6 parts (weight);
Aluminium hydroxide is 12～15 parts (weight);
Light calcium carbonate is 8～20 parts (weight).
If want to regulate and control the density of product, can add AC whipping agent and ACR foaming control agent.Preferably add the AC whipping agent of 0.1～0.5 part (weight) and the ACR foaming control agent of 1～5 part (weight), make the density of product reach 0.65～1.2g/cm
3
Further strengthen the intensity and the shock resistance of product if desired, can strengthen the content of light calcium carbonate, and add coupling agent, preferably add the light calcium carbonate of 21～40 parts (weight) and the coupling agent of 2～12 parts (weight).
In order further to strengthen the ageing resistance of product, can add the UV-series UV light absorber of 2～6 parts (weight).Also can add the color that corresponding material changes goods.As add the titanium dioxide of 1～2 part (weight), or add the phthalocyanine blue of 0.01～0.05 part (weight), or add the middle network Huang of 0.05～0.5 part (weight) etc., to make the goods of respective color.
Preparation method of the present invention comprises following step:
1, the weight ratio according to above-mentioned prescription takes by weighing each composition branch material.That is: 100 parts of polyvinyl chloride (PVC) (weight meter); 4～6 parts of complex lead salt stabilizers (weight); 4～6 parts of chlorinatedpolyethylenees (CPE) (weight); 0.15～0.5 part of stearic acid (weight); 2～4 parts of o-phthalic acid dibutyl esters (DOP) (weight); 3～6 parts of zinc borates (weight); 4～6 parts of molybdic oxides (weight); 12～15 parts in aluminium hydroxide (weight); 8～20 parts of light calcium carbonates (weight).
2, earlier with polyvinyl chloride (PVC), complex lead salt stabilizer, chlorinatedpolyethylene (CPE), light calcium carbonate; add successively in the high speed kneader at normal temperatures and stir; when rising to 70～80 ℃, temperature shuts down; adding stearic acid, o-phthalic acid dibutyl ester (DOP), zinc borate, molybdic oxide and aluminium hydroxide again continues to stir; when temperature of charge rises to 110～115 ℃; material is entered cold stirring in the machine, and loose shape dry mixed powder is made in discharging when being cooled to 38～45 ℃.
3, granulation.Heat earlier, reached after the temperature of setting insulation 30 minutes, add the dry powder batch mixing that makes again, adjust the tablets press engine speed and carry out granulation to tablets press.Relatively Shi Yi temperature is as follows:
Two districts (105 ± 5 ℃) three districts, one district (90 ± 5 ℃) (120 ± 5 ℃)
Five districts (145 ± 5 ℃) six districts, four districts (130 ± 5 ℃) (140 ± 5 ℃)
4, extrusion moulding.Adopt the single screw extrusion machine extrusion moulding.After material is extruded from head, check the material plasticizing situation earlier, adjust the temperature setting, do not allow bigger temperature fluctuation.Through the granulated materials extrusion moulding, obtain required goods.Relatively Shi Yi temperature is as follows:
Two districts (160 ± 5 ℃) three districts, one district (150 ± 5 ℃) (170 ± 5 ℃)
Five districts (195 ± 5 ℃) six districts, four districts (185 ± 5 ℃) (180 ± 5 ℃)
Composition according to above-mentioned component concentration and manufacture method obtain detects through " national fixed fire extinguishing system and fire retarding component quality supervision and test center ", and the product combustionproperty reaches GB8624B
1Level (thermoplastic material) has met and exceeded state specified standards.Wherein oxygen index 〉=55 (%) (standard-required 〉=32 (%)), horizontal firing reaches the FH-1 level, smoke density grade (SOR)≤61, (standard-required≤75).This product strength height, good toughness, anti-aging, fire-retardant, waterproof, insulation, sound insulation can be used as all kinds of skeleton construction pad bodies of wall of industry and covil construction, corresponding articles such as alternative present metal, glass reinforced plastic, be the building and ornament materials of a kind of ideal " to mould Dai Gang, to mould Dai Mu ".
The invention will be further described below in conjunction with embodiment, but the present invention is not limited only to these examples.
Embodiment 1
Adopt polyvinyl chloride (PVC) 100 kilograms, 5 kilograms of complex lead salt stabilizers, 5 kilograms of chlorinatedpolyethylenees (CPE), 0.2 kilogram of stearic acid, 2 kilograms of o-phthalic acid dibutyl esters (DOP), 5 kilograms of zinc borates,, 4 kilograms of molybdic oxides, 13 kilograms in aluminium hydroxide, 15 kilograms of light calcium carbonates.
With polyvinyl chloride (PVC), complex lead salt stabilizer, chlorinatedpolyethylene (CPE), the light calcium carbonate of being got; add start stirring in the high speed kneader at normal temperatures successively; when rising to 70 ℃, temperature shuts down; adding stearic acid, o-phthalic acid dibutyl ester (DOP), zinc borate, molybdic oxide and aluminium hydroxide again continues to stir; when temperature of charge rises to 115 ℃; material is entered cold stirring in the machine, and loose shape dry mixed powder is made in discharging when being cooled to 40 ℃.Heat to tablets press then, reached behind the design temperature insulation 30 minutes, add the dry powder batch mixing that makes again, adjust the tablets press engine speed and carry out granulation.Adopt the single screw extrusion machine extrusion moulding to obtain required goods at last.Extrudate density reaches 1.30～1.50g/cm
3, vertical, horizontal tensile strength (mpa) 〉=53, vertical, horizontal shock strength (kj/m
2) 〉=6.8.
Embodiment 2
Adopt polyvinyl chloride (PVC) 100 kilograms, 4 kilograms of complex lead salt stabilizers, 5 kilograms of chlorinatedpolyethylenees (CPE), 0.3 kilogram of stearic acid, 2.5 kilograms of o-phthalic acid dibutyl esters (DOP), 4 kilograms of zinc borates, 5 kilograms of molybdic oxides, 15 kilograms in aluminium hydroxide, 18 kilograms of light calcium carbonates, 0.3 kilogram of AC whipping agent, 3 kilograms of ACR foaming control agents.
With polyvinyl chloride (PVC), complex lead salt stabilizer, chlorinatedpolyethylene (CPE), the light calcium carbonate of being got; add start stirring in the high speed kneader at normal temperatures successively; when rising to 75 ℃, temperature shuts down; adding stearic acid, o-phthalic acid dibutyl ester (DOP), zinc borate, AC whipping agent, ACR foaming control agent, molybdic oxide and aluminium hydroxide again continues to stir; when temperature of charge rises to 120 ℃; material is entered cold stirring in the machine; loose shape dry mixed powder is made in discharging when being cooled to 40 ℃.Heat to tablets press then, reached behind the design temperature insulation 30 minutes, add the dry powder batch mixing that makes again, adjust the tablets press engine speed and carry out granulation.Adopt the single screw extrusion machine extrusion moulding at last, obtain required goods.The density of goods reaches 0.65～0.85g/cm
3
Embodiment 3
Adopt polyvinyl chloride (PVC) 100 kilograms, 6 kilograms of complex lead salt stabilizers, 5.5 kilograms of chlorinatedpolyethylenees (CPE), 0.4 kilogram of stearic acid, 3.5 kilograms of o-phthalic acid dibutyl esters (DOP), 4.5 kilograms of zinc borates,, 4.5 kilograms of molybdic oxides, 13 kilograms in aluminium hydroxide, 30 kilograms of light calcium carbonates, 0.2 kilogram of AC whipping agent, 2 kilograms of ACR foaming control agents add 8 kilograms of coupling agents again.
With polyvinyl chloride (PVC), complex lead salt stabilizer, chlorinatedpolyethylene (CPE), the light calcium carbonate of being got; add start stirring in the high speed kneader at normal temperatures successively; when rising to 75 ℃, temperature shuts down; adding stearic acid, o-phthalic acid dibutyl ester (DOP), zinc borate, molybdic oxide, coupling agent, AC whipping agent, ACR foaming control agent and aluminium hydroxide again continues to stir; when temperature of charge rises to 118 ℃; material is entered cold stirring in the machine; loose shape dry mixed powder is made in discharging when being cooled to 40 ℃.Adopt the twin screw extruder extrusion moulding to obtain required goods.The vertical, horizontal tensile strength of products made thereby is 〉=54, and the vertical, horizontal shock strength is 〉=7.2, and density reaches 0.86～1.00g/cm
3
Embodiment 4
Adopt polyvinyl chloride (PVC) 100 kilograms, 5.5 kilograms of complex lead salt stabilizers, 5 kilograms of chlorinatedpolyethylenees (CPE), 0.35 kilogram of stearic acid, 3.5 kilograms of o-phthalic acid dibutyl esters (DOP), 4.5 kilograms of zinc borates,, 4.5 kilograms of molybdic oxides, 13 kilograms in aluminium hydroxide, 14 kilograms of light calcium carbonates, 0.18 kilogram of AC whipping agent, 2 kilograms of ACR foaming control agents, 5 kilograms of coupling agents add 4 kilograms of 0.2～0.5 kilogram of UV-9 or UV-531 UV light absorber again.
With polyvinyl chloride (PVC), complex lead salt stabilizer, chlorinatedpolyethylene (CPE), the stearic acid light calcium carbonate of being got; add start stirring in the high speed kneader at normal temperatures successively; when rising to 70 ℃, temperature shuts down; adding stearic acid, o-phthalic acid dibutyl ester (DOP), zinc borate, molybdic oxide, AC whipping agent, ACR foaming control agent, coupling agent, UV-series UV light absorber and aluminium hydroxide again continues to stir; when temperature of charge rises to 120 ℃; material is entered cold stirring in the machine; loose shape dry mixed powder is made in discharging when being cooled to 40 ℃.Heat to tablets press then, reached behind the design temperature insulation 30 minutes, add the dry powder batch mixing that makes again, adjust the tablets press engine speed and carry out granulation.Adopt the single screw extrusion machine extrusion moulding to obtain required goods at last.After tested, the ageing resistance of goods be extended down to 30～50 years constant.
Embodiment 5
Adopt polyvinyl chloride (PVC) 100 kilograms, 4.5 kilograms of complex lead salt stabilizers, 5.5 kilograms of chlorinatedpolyethylenees (CPE), 0.3 kilogram of stearic acid, 3.5 kilograms of o-phthalic acid dibutyl esters (DOP), 4.5 kilograms of zinc borates,, 4.5 kilograms of molybdic oxides, 13 kilograms in aluminium hydroxide, 10 kilograms of light calcium carbonates add 1.6 kilograms of titanium dioxides again.
With polyvinyl chloride (PVC), complex lead salt stabilizer, chlorinatedpolyethylene (CPE), the light calcium carbonate of being got; add start stirring in the high speed kneader at normal temperatures successively; when rising to 75 ℃, temperature shuts down; adding stearic acid, o-phthalic acid dibutyl ester (DOP), zinc borate, molybdic oxide, titanium dioxide and aluminium hydroxide again continues to stir; when temperature of charge rises to 120 ℃; material is entered cold stirring in the machine, and loose shape dry mixed powder is made in discharging when being cooled to 40 ℃.Heat to tablets press then, reached behind the design temperature insulation 30 minutes, add the dry powder batch mixing that makes again, adjust the tablets press engine speed and carry out granulation.Adopt the single screw extrusion machine extrusion moulding to obtain the goods of required color at last.
Embodiment 6
Adopt polyvinyl chloride (PVC) 100 kilograms, 4.5 kilograms of complex lead salt stabilizers, 5.5 kilograms of chlorinatedpolyethylenees (CPE), 0.3 kilogram of stearic acid, 3.5 kilograms of o-phthalic acid dibutyl esters (DOP), 4.5 kilograms of zinc borates, 4.5 kilograms of molybdic oxides, 13 kilograms in aluminium hydroxide, 10 kilograms of light calcium carbonates add 0.015 kilogram of phthalocyanine blue again.
With polyvinyl chloride (PVC), complex lead salt stabilizer, chlorinatedpolyethylene (CPE), the light calcium carbonate of being got; add start stirring in the high speed kneader at normal temperatures successively; when rising to 75 ℃, temperature shuts down; adding stearic acid, o-phthalic acid dibutyl ester (DOP), zinc borate, molybdic oxide, phthalocyanine blue and aluminium hydroxide again continues to stir; when temperature of charge rises to 120 ℃; material is entered cold stirring in the machine, and loose shape dry mixed powder is made in discharging when being cooled to 40 ℃.Heat to tablets press then, reached behind the design temperature insulation 30 minutes, add the dry powder batch mixing that makes again, adjust the tablets press engine speed and carry out granulation.Adopt the single screw extrusion machine extrusion moulding to obtain the goods of required color at last.
Embodiment 7
Adopt polyvinyl chloride (PVC) 100 kilograms, 4.5 kilograms of complex lead salt stabilizers, 5.5 kilograms of chlorinatedpolyethylenees (CPE), 0.3 kilogram of stearic acid, 3.5 kilograms of o-phthalic acid dibutyl esters (DOP), 4.5 kilograms of zinc borates,, 4.5 kilograms of molybdic oxides, 13 kilograms in aluminium hydroxide, 10 kilograms of light calcium carbonates, network is yellow 0.2 kilogram in adding again.
With polyvinyl chloride (PVC), complex lead salt stabilizer, chlorinatedpolyethylene (CPE), the light calcium carbonate of being got; add start stirring in the high speed kneader at normal temperatures successively; when rising to 75 ℃, temperature shuts down; adding stearic acid, o-phthalic acid dibutyl ester (DOP), zinc borate, molybdic oxide, middle network Huang and aluminium hydroxide again continues to stir; when temperature of charge rises to 120 ℃; material is entered cold stirring in the machine, and loose shape dry mixed powder is made in discharging when being cooled to 40 ℃.Heat to tablets press then, reached behind the design temperature insulation 30 minutes, add the dry powder batch mixing that makes again, adjust the tablets press rotating speed and carry out granulation.Adopt the single screw extrusion machine extrusion moulding to obtain the goods of required color at last.
Claims (6)
1, a kind of difficult combustion PVC industrial wall slab composition is characterized in that containing following component and content:
100 parts of polyvinyl chloride (PVC) (weight meter);
4～6 parts of complex lead salt stabilizers (weight);
4～6 parts of chlorinatedpolyethylenees (CPE) (weight);
0.15～0.5 part of stearic acid (weight);
2～4 parts of o-phthalic acid dibutyl esters (DOP) (weight);
3～6 parts of zinc borates (weight);
4～6 parts of molybdic oxides (weight);
12～15 parts in aluminium hydroxide (weight);
8～20 parts of light calcium carbonates (weight).
2, difficult combustion PVC industrial wall slab composition according to claim 1 is characterized in that containing the AC whipping agent of 0.1～0.5 part (weight) and the ACR foaming control agent of 1～5 part (weight).
3, difficult combustion PVC industrial wall slab composition according to claim 1 and 2 is characterized in that containing the light calcium carbonate of 21～40 parts (weight) and the coupling agent of 2～12 parts (weight).
4,, it is characterized in that adding the UV-series UV light absorber of 0.2～0.5 part (weight) according to claim 1,2 or 3 described difficult combustion PVC industrial wall slab compositions.
5, according to claim 1,2,3 or 4 described difficult combustion PVC industrial wall slab compositions, it is characterized in that containing the titanium dioxide of 1～2 part (weight), or the phthalocyanine blue of 0.01～0.05 part (weight), or the middle network Huang of 0.05～0.5 part (weight).
6, the difficult combustion of a kind of manufacturing PVC industrial wall slab method for compositions is characterized in that may further comprise the steps:
(1) weight ratio according to above-mentioned prescription takes by weighing each composition branch material.That is: 100 parts of polyvinyl chloride (PVC) (weight meter); 4～6 parts of complex lead salt stabilizers (weight); 4～6 parts of chlorinatedpolyethylenees (CPE) (weight); 0.15～0.5 part of stearic acid (weight); 2～4 parts of o-phthalic acid dibutyl esters (DOP) (weight); 3～6 parts of zinc borates (weight); 4～6 parts of molybdic oxides (weight); 12～15 parts in aluminium hydroxide (weight); 8～20 parts of light calcium carbonates (weight).
(2) earlier with polyvinyl chloride (PVC), complex lead salt stabilizer, chlorinatedpolyethylene (CPE), light calcium carbonate; add successively in the high speed kneader at normal temperatures and stir; when rising to 65～75 ℃, temperature shuts down; adding stearic acid, o-phthalic acid dibutyl ester (DOP), zinc borate, molybdic oxide and aluminium hydroxide again continues to stir; when temperature of charge rises to 110～115 ℃; material is entered cold stirring in the machine, and loose shape dry mixed powder is made in discharging when being cooled to 38～45 ℃.
(3) granulation and extrusion moulding.Heat earlier, reached after the temperature of setting insulation 30 minutes, add the granulation of dry powder batch mixing again, and adopt the single screw extrusion machine extrusion moulding to tablets press; Or the dry powder batch mixing directly added the twin screw extruder extrusion moulding, obtain required goods.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99112256 CN1080743C (en) | 1999-06-02 | 1999-06-02 | Composition used for fire resistant industrial wall slab and its production technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99112256 CN1080743C (en) | 1999-06-02 | 1999-06-02 | Composition used for fire resistant industrial wall slab and its production technology |
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| Publication Number | Publication Date |
|---|---|
| CN1276393A true CN1276393A (en) | 2000-12-13 |
| CN1080743C CN1080743C (en) | 2002-03-13 |
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ID=5275579
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| CN 99112256 Expired - Fee Related CN1080743C (en) | 1999-06-02 | 1999-06-02 | Composition used for fire resistant industrial wall slab and its production technology |
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| CN100537706C (en) * | 2006-08-25 | 2009-09-09 | 嵊州市电缆防火附件厂 | The manufacture method of non-expansion type halogen-free organic fireproof block material |
| CN101497727B (en) * | 2009-03-04 | 2012-05-23 | 南亚塑胶工业股份有限公司 | PVC resin composition and product thereof |
| CN102373773A (en) * | 2010-08-16 | 2012-03-14 | 苏州富通电器塑业有限公司 | Polymer wall tile and preparation method thereof |
| CN102555181A (en) * | 2010-12-27 | 2012-07-11 | 王松 | Preparation method of environment-friendly composite polyvinyl chloride (PVC) plastic profiles and installation method of corner wall protector |
| CN102303962B (en) * | 2011-05-20 | 2013-02-20 | 湖北江豪微晶石材料制品有限责任公司 | Microlite fireproof section |
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