CN1158348C - Thermoplastic composition capable of being used as fan material - Google Patents
Thermoplastic composition capable of being used as fan material Download PDFInfo
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- CN1158348C CN1158348C CNB011050071A CN01105007A CN1158348C CN 1158348 C CN1158348 C CN 1158348C CN B011050071 A CNB011050071 A CN B011050071A CN 01105007 A CN01105007 A CN 01105007A CN 1158348 C CN1158348 C CN 1158348C
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Abstract
The present invention relates to a thermoplastic composition capable of being used as a fan material, which comprises (measured by portions by weight) 30 to 70 portions of styrene-acrylonitrile random copolymer, 10 to 40 portions of twistless long glass fibers, 10 to 30 portions of styrene-maleic anhydride random copolymer or methylstyrene-maleic anhydride random copolymer, and 0.1 to 2.0 portions of at least one of isopropyl benzene peroxide, tertiary butyl peroxide, dialkyl peroxide having a general formula of R1O-OR2 or alkyl peroxide having a general formula of R3O-OH. In the formulas, R1, R2 and R3 are respectively alkyl groups of C1 to C10. The composition having outstanding mechanical strength can be used in industrial production.
Description
The present invention relates to a kind of thermoplastic compounds that can be used as fan material.
As everyone knows, enhancing modified is to add strongthener to improve polymer property in polymkeric substance, a kind of method of modifying of often using of mechanical property particularly, the effect of strongthener in polymkeric substance is just as the effect of Framework Of Steel Reinforcement in cement constructional material, because glass fibre, the excellent reinforced effects of strongtheners such as carbon fiber, in thermoplastic material, add an amount of this class material, the goods that go out through mixing moulding can make thermoplastic material hardness increase, flexibility reduces, it is reported flexural strength with glass fibre enhanced thermoplastic material, indexs such as tensile strength are compared with no reinforced plastics and will be improved 2～3 times, as using glass fibre enhanced styrene plastic: vinylbenzene-divinyl-acrylonitrile copolymer (ABS), polystyrene (PS), vinylbenzene-acrylonitrile copolymer materials such as (SAN), has good processing properties, dimensional stability and higher bending elastic modulus, in the plastic applications field, especially at air-conditioning, electric fan, fields such as instrument skeleton are applied; But then, because the glass fibre volume is huge, short texture, high-molecular copolymer is in molten state in the preparation process simultaneously, and viscosity is higher, be difficult to moulded products, it is relatively poor to make that inorganic glass fiber and organic macromolecular copolymer combine consistency, and glass fibre dispersing uniformity in multipolymer is poor, and the intermolecular coagulative power of the composition of preparation is poor, thermoplastic material comprehensive technical performance index is undesirable, is difficult to reach overall equilbrium.For example WO91-15543 discloses a kind of method with glass fibre reinforced styrene-divinyl-acrylonitrile copolymer (ABS) and vinylbenzene-maleic anhydride (SMA) polyblend system, this method adopts in ABS/SMA polyblend system, add short glass fiber, to improve the performance of the thermoplastic compounds for preparing.Wherein the SMA consumption is 50% (weight), about 50% (weight) of ABS consumption, and the thermoplastic material tensile strength of preparation is 88MPa, and bending elastic modulus is 4725MPa, and notched Izod impact strength is 10 kilojoule/rice
2The inventor thinks the quality of glass fibre enhancement, relevant with its factor such as length, dispersion state and distributing homogeneity in polymer composition or goods, this method is owing to adopt short glass fiber, the main filler effect that rises is difficult to play the ideal enhancement in mixed with polymers and prepared in reaction; From the disclosed data of the document, tensile strength, the bending elastic modulus of the thermoplastic compounds material of preparation are lower, and this method also exists the reinforced and metering instability of short glass fiber, the defective of troublesome poeration simultaneously.
Day disclosure is speciallyyed permit flat 3-33497 and is disclosed all performances of a kind of employing glass fibre of Co., Ltd. enhanced vinylbenzene-divinyl-acrylonitrile copolymer (ABS) thermoplastic engineering plastic of a kind of Meng Shan, and it consists of ABS-1, and consumption is 30% (weight); Vinylbenzene-acrylonitrile copolymer SAN-1, consumption are 10% (weight); Vinylbenzene-acrylonitrile copolymer SAN-2, consumption are 40% (weight), and the thermoplastic material tensile strength of preparation is 108MPa, and bending elastic modulus is 6596MPa, and notched Izod impact strength is 7.5 a kilograms * cm/, 103 ℃ of heat-drawn wires.From the disclosed data of the document, the processing method that adopts the document to introduce, thermoplastic material tensile strength, the bending elastic modulus of preparation have a more substantial increase than the aforementioned documents technology, but also do not reach gratifying effect, and heat-drawn wire improves the breakthrough that does not have essence; In the plastic engineering Application Areas, people wish to obtain the excellent more thermoplastic material of comprehensive mechanical intensity, to satisfy the needs of production application.
The present invention seeks in order to overcome exist in the above-mentioned document low with glass fibre enhanced thermoplastic material or composition tensile strength, bending elastic modulus and heat-drawn wire, the unfavorable defective of comprehensive technical indexes, a kind of thermoplastic compounds of new compositional system is provided, said composition has very high tensile strength, bending elastic modulus, heat-drawn wire and notched Izod impact strength, has the excellent comprehensive physical strength.
The present invention seeks to be achieved through the following technical solutions: a kind of thermoplastic compounds as fan material comprises in parts by weight:
(a) 30～70 parts of vinylbenzene-vinyl cyanide random copolymerss, wherein vinyl cyanide is 20～35% by weight percentage;
(b) 10～40 parts of non-twist long glass fibress;
(c) 10～30 parts of vinylbenzene-maleic anhydride random copolymers or vinyl toluene-maleic anhydride random copolymer, wherein maleic anhydride is 5～25% by weight percentage;
(d) at least a 0.1～2.0 part of superoxide, this superoxide are that the special butyl ester of isopropyl benzene hydroperoxide, peroxidation phenylformic acid, general formula are R
1O-OR
2Dialkyl peroxide or general formula be R
3The alkyl peroxide of O-OH, R in the formula
1, R
2Or R
3Be respectively C
1～C
10Alkyl.
In the technique scheme, described vinylbenzene-vinyl cyanide random copolymers is 45～65 parts in the parts by weight preferable range, the glass fibre preferable range is 20～30 parts, vinylbenzene-maleic anhydride random copolymer or vinyl toluene-maleic anhydride random copolymer preferable range is 15～25 parts, and described superoxide preferable range is 0.3～1.5 part.
In the technique scheme, described R
1, R
2Or R
3Preferable range is respectively C
3～C
6Alkyl.
In the technique scheme, described thermoplastic compounds also contains in vinylbenzene-divinyl-acrylonitrile copolymer, methyl methacrylate-divinyl-phenylethene grafted copolymer or the vinylbenzene-divinyl-styrene block copolymer at least a, and its consumption is counted 5～15 parts with parts by weight; Preferable range is 5～10 parts.
The preparation raw materials used vinylbenzene-acrylonitrile copolymer of the present composition (SAN) is the random copolymers of being produced by letex polymerization, suspension polymerization or technique of continuous bulk polymerization, wherein acrylonitrile content is 20～35% (weight), melt index 1～5 gram/10 minutes (200 ℃ * 5 kilograms); Benzene feedstock ethene-maleic anhydride or vinyl toluene-maleic anhydride (SMA) are the random copolymers of being produced by technique of continuous bulk polymerization, and wherein maleic anhydride content is 5～25% (weight), and preferable range is 10～25%; Non-twist long glass fibres, vinylbenzene-divinyl-acrylonitrile copolymer (ABS), methyl methacrylate-divinyl-phenylethene grafted copolymer (MBS), vinylbenzene-divinyl-styrene block copolymer (SBS) is the product of market sale.
Present composition preparation method mainly is divided into two steps: first step is material preliminary treatment process: at first with 30～70 parts of (weight) styrene-acrylonitrile random copolymer (SAN) and 10～30 parts of (weight) styrene or methyl styrene-maleic anhydride random copolymer (SMA), 0～15 part of (weight) styrene-butadiene-acrylonitrile copolymer (ABS) or/and methyl methacrylate-butadiene-phenylethene grafted copolymer (MBS) or/and styrene-butadiene-phenylethene grafted copolymer (SBS) mix; Then 0.1～2.0 part of (weight) superoxide is dissolved in aliphatic alcohols or the alkanones solvent, be mixed with concentration expressed in percentage by weight and be 1～30% solution, 10～40 parts of (weight) non-twist long glass fibress be impregnated in the solution of above-mentioned preparation and handle, steeping process can be that intermittent process also can be a successive processes, 0～50 ℃ of of the dipping solution temperature is, 180～250 ℃ of of the twin of dipping time 0.5～40 minute.Second step is mixing and reaction process:it is in screw banded extruder that the above-mentioned SAN that mixes and SMA pellet are added service temperature, plastifying fusion under the pellet heat effect outside, at this moment the glass fibre with above-mentioned processing is sent in the fused material by feed mechanism, by the screw rod rotation material is fed forward, the material molten mass is coated on around the glass fibre under pressure, mix and react by screw rod rotation, and remove the volatile matter that reaction process produces, the composition that reacts completely is extruded through screw rod, cooling, be cut into pellet, final drying is a finished product.
The every testing performance index of thermoplastic compounds of the present invention, for example tensile strength, modulus in flexure, notched Izod impact strength and heat-drawn wire all adopt the national universal test standard in ASTM standard or present technique field, and each index test condition is not had particular requirement.
The present composition belongs to the glass filament reinforced plastics system, mainly is made of organic copolymer and inorganic glass fiber, and the power of both cohesive forces directly has influence on the physical strength and the ageing-resistant performance of composition article.The present invention is material of main part with SAN, introduces SMA as compatilizer, at first forms the multiple and system of plastics with SAN, strengthens between the organic copolymer and the consistency between the inorganics; It is R that the present invention simultaneously adopts cumene peroxide, t-butyl peroxide, general formula
1O-OR
2Dialkyl peroxide or general formula be R
3Chemical processing agent such as the alkyl peroxide of O-OH, before glass fibre and fusion organism blending reaction, adopt certain processing condition that fiberglass surfacing is carried out chemical treatment, this chemical processing agent plays a kind of intermediate axle beam effect, make treated glass fibre and organic copolymer in melting mixing and extrusion, be closely linked by chemical force, fundamentally promote the intermolecular bonding force of organism and inorganics; According to actual needs, the present invention also can introduce anti-impact agent such as ABS, MBS, SBS, shock resistance with the rigid composition of further improvement, the each component of the present composition is under described preparation condition, pass through blending and modifying, each component acts synergistically, obviously improved the whole synthesis performance of thermoplastic compounds, the high tensile of the thermoplastic compounds of preparation reaches 127MPa, modulus in flexure 8500MPa, 8.7 kilograms * cm/of notched Izod impact strength, 110 ℃ of heat-drawn wires have obtained good effect; And with the corresponding comparative example of the present invention in, with vinylbenzene-vinyl cyanide random copolymers (SAN) and without any pretreated glass fibre melt blending, do not introduce vinylbenzene-maleic anhydride random copolymer (SMA), other preparation condition is identical with the embodiment of the invention, the thermoplastic compounds tensile strength of preparation is 80MPa, modulus in flexure 5000MPa, 6.0 kilograms * cm/of notched Izod impact strength, 100 ℃ of heat-drawn wires, its integrated performance index are obviously on the low side than the integrated performance index of any composition of the present invention.
Thermoplastic compounds of the present invention is owing to have ideal comprehensive mechanical intensity, can be applicable to make heating, heating ventilation and air-conditioning and reaches fields such as household electrical appliance clamshell that thermotolerance and mechanical property are had relatively high expectations, electron device with fan art.
The invention will be further elaborated below by embodiment.
[embodiment 1]
First step is the material preprocessing process: will contain 30 parts of the vinylbenzene of vinyl cyanide 25% (weight)-vinyl cyanide random copolymers (SAN), contain 30 parts of the vinylbenzene-maleic anhydride random copolymers (SMA) of maleic anhydride 20% (weight), vinylbenzene-divinyl-acrylonitrile copolymer (ABS) mixes for 15 parts; Be C with molecular formula then
6H
5C (CH
3)
2The isopropyl benzene hydroperoxide of O-OH is dissolved in the alcohol solvent for 1.0 parts, is mixed with concentration expressed in percentage by weight and is 20% solution, 25 parts of non-twist long glass fibress be impregnated in the solution of above-mentioned preparation to handle, and the dipping solution temperature is 25 ℃, dipping time 20 minutes;
Second step is a reaction process: with the above-mentioned SAN that mixes, SMA and ABS pellet adding service temperature is in 210 ℃ of twin screw banded extruders, plastifying fusion under the pellet heat effect outside, when reaching the viscosity flow state, the glass fibre that above-mentioned isopropyl benzene hydroperoxide solution-treated is crossed is sent in the fused material by feed mechanism, mix and react by screw rod rotation, and remove the volatile matter that reaction process produces, said composition is extruded through screw rod, cooling also is cut into pellet, and final drying is a finished product.
Thermoplastic compounds component content and the test result made see Table 1.
[embodiment 2]
To contain 35 parts of the vinylbenzene of vinyl cyanide 25% (weight)-vinyl cyanide random copolymers (SAN), contain 30 parts of the vinyl toluene-maleic anhydride random copolymers (SMA) of maleic anhydride 20% (weight), 5 parts of methyl methacrylate-divinyl-phenylethene grafted copolymer (MBS) and vinylbenzene-divinyl-styrene block copolymer (SBS) mix for 5 parts; Be (CH with molecular formula then
3)
3CO-OC (CH
3)
30.7 part of di-tert-butyl peroxide and molecular formula be HO-OC
3H
7Propyl group hydrogen peroxidase 10 .8 part be dissolved in the acetone solvent, be mixed with concentration expressed in percentage by weight and be 18% solution, 25 parts of non-twist long glass fibress be impregnated in the solution of above-mentioned preparation and handle, the dipping solution temperature is 20 ℃, dipping time 15 minutes; Other operational condition is with embodiment 1.
Thermoplastic compounds component content and the test result made see Table 1.
[embodiment 3]
To contain 40 parts of the vinylbenzene of vinyl cyanide 28% (weight)-vinyl cyanide random copolymers (SAN), contain 25 parts of the vinylbenzene-maleic anhydride random copolymers (SMA) of maleic anhydride 22% (weight), 10 parts of methyl methacrylate-divinyl-phenylethene grafted copolymer (MBS) and vinylbenzene-divinyl-acrylonitrile copolymer (ABS) mix for 5 parts; Be C with molecular formula then
6H
5C (CH
3)
2O-O (CH
3)
2CC
6H
5Dicumyl peroxide be dissolved in the alcohol solvent for 0.8 part, be mixed with concentration expressed in percentage by weight and be 15% solution, 20 parts of non-twist long glass fibress be impregnated in the solution of above-mentioned preparation and handle, the dipping solution temperature is 25 ℃, dipping time 10 minutes; Other operational condition is with embodiment 1.
Thermoplastic compounds component content and the test result made see Table 1.
[embodiment 4]
To contain 35 parts of the vinylbenzene of vinyl cyanide 22% (weight)-vinyl cyanide random copolymers (SAN), the vinylbenzene-maleic anhydride random copolymer (SMA) that contains maleic anhydride 18% (weight) mixes for 25 parts; Be H with molecular formula then
11C
5-O-O-C
3H
7Superoxide be dissolved in the alcohol solvent for 0.5 part, be mixed with concentration expressed in percentage by weight and be 15% solution, 40 parts of non-twist long glass fibress be impregnated in the solution of above-mentioned preparation and handle, the dipping solution temperature is 25 ℃, dipping time 15 minutes; Other operational condition is with embodiment 1.
Thermoplastic compounds component content and the test result made see Table 1.
[embodiment 5]
To contain 40 parts of the vinylbenzene of vinyl cyanide 26% (weight)-vinyl cyanide random copolymers (SAN), 20 parts of vinylbenzene-maleic anhydride random copolymers (SMA) that contain maleic anhydride 20% (weight), 5 parts of vinylbenzene-divinyl-acrylonitrile copolymer (ABS) mix for 5 parts with vinylbenzene-divinyl-styrene block copolymer (SBS); Be C with molecular formula then
6H
5C (CH
3)
2O-O (CH
3)
2CC
6H
5Dicumyl peroxide be dissolved in the alcohol solvent for 1.2 parts, be mixed with concentration expressed in percentage by weight and be 15% solution, 30 parts of non-twist long glass fibress be impregnated in the solution of above-mentioned preparation and handle, the dipping solution temperature is 25 ℃, dipping time 10 minutes; Other operational condition is with embodiment 1.
Thermoplastic compounds component content and the test result made see Table 1.
[embodiment 6]
To contain 45 parts of the vinylbenzene of vinyl cyanide 25% (weight)-vinyl cyanide random copolymers (SAN), contain 30 parts of the vinylbenzene-maleic anhydride random copolymers (SMA) of maleic anhydride 20% (weight), mix for 5 parts with methyl methacrylate-divinyl-phenylethene grafted copolymer (MBS); Be H with molecular formula then
9C
4-O-O-C
6H
13Superoxide be dissolved in the alcohol solvent for 1.0 parts, be mixed with concentration expressed in percentage by weight and be 1 5% solution, 20 parts of non-twist long glass fibress be impregnated in the solution of above-mentioned preparation and handle, the dipping solution temperature is 25 ℃, dipping time 15 minutes; Other operational condition is with embodiment 1.
Thermoplastic compounds component content and the test result made see Table 1.
[embodiment 7]
To contain 50 parts of the vinylbenzene of vinyl cyanide 26% (weight)-vinyl cyanide random copolymers (SAN), the vinylbenzene-maleic anhydride random copolymer (SMA) that contains maleic anhydride 22% (weight) mixes for 20 parts; Be C with molecular formula then
6H
5C (CH
3)
2The isopropyl benzene hydroperoxide of O-OH is dissolved in the alcohol solvent for 0.5 part, is mixed with concentration expressed in percentage by weight and is 15% solution, 30 parts of non-twist long glass fibress be impregnated in the solution of above-mentioned preparation to handle, and the dipping solution temperature is 25 ℃, dipping time 8 minutes; Other operational condition is with embodiment 1.
Thermoplastic compounds component content and the test result made see Table 1.
[embodiment 8]
To contain 60 parts of the vinylbenzene of vinyl cyanide 24% (weight)-vinyl cyanide random copolymers (SAN), 15 parts of vinylbenzene-maleic anhydride random copolymers (SMA) that contain maleic anhydride 20% (weight) mix for 10 parts with vinylbenzene-divinyl-styrene block copolymer (SBS); Be H with molecular formula then
7C
3The superoxide of-O-OH is dissolved in the acetone solvent for 0.3 part, is mixed with concentration expressed in percentage by weight and is 10% solution, 15 parts of non-twist long glass fibress be impregnated in the solution of above-mentioned preparation to handle, and the dipping solution temperature is 20 ℃, dipping time 12 minutes; Other operational condition is with embodiment 1.
Thermoplastic compounds component content and the test result made see Table 1.
[embodiment 9]
To contain 70 parts of the vinylbenzene of vinyl cyanide 18% (weight)-vinyl cyanide random copolymers (SAN), 10 parts of vinylbenzene-maleic anhydride random copolymers (SMA) that contain maleic anhydride 19% (weight) mix for 5 parts with 5 parts of vinylbenzene-divinyl-acrylonitrile copolymers (ABS) and methyl methacrylate-divinyl-phenylethene grafted copolymer (MBS); Be C with molecular formula then
6H
5COO-OC (CH
3)
3The special butyl ester of peroxidation phenylformic acid be dissolved in the acetone solvent for 0.5 part, be mixed with concentration expressed in percentage by weight and be 10% solution, 10 parts of non-twist long glass fibress be impregnated in the solution of above-mentioned preparation and handle, the dipping solution temperature is 20 ℃, dipping time 12 minutes; Other operational condition is with embodiment 1.
Thermoplastic compounds component content and the test result made see Table 1.
[comparative example 1]
Vinylbenzene-70 parts of addings of vinyl cyanide random copolymers (SAN) service temperature that will contain vinyl cyanide 24% (weight) is in 210 ℃ of twin screw banded extruders, plastifying fusion under the pellet heat effect outside, when reaching the viscosity flow state, to be sent in the fused material by feed mechanism without 30 parts in the glass fibre of any solution-treated, mix and react by screw rod rotation, and remove the volatile matter of reaction process generation, said composition is extruded through screw rod, cooling also is cut into pellet, and final drying is a finished product.
Thermoplastic compounds component content and the test result made see Table 1.
Table 1 composition component content and test result
| Embodiment | Comparative example | ||||||||||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 1 | ||
| Composition component and each component parts by weight | SAN (part) | 30 | 35 | 40 | 35 | 40 | 45 | 50 | 60 | 70 | 70 |
| GF (part) | 25 | 25 | 20 | 40 | 30 | 20 | 30 | 15 | 10 | 30 | |
| SMA (part) | 30 | 30 | 25 | 25 | 20 | 30 | 20 | 15 | 10 | 0 | |
| Superoxide (part) | 1.0 | 1.5 | 0.8 | 0.5 | 1.2 | 1.0 | 0.5 | 0.3 | 0.5 | 0 | |
| ABS (part) | 15 | 0 | 5 | 0 | 5 | 0 | 0 | 0 | 5 | 0 | |
| MBS (part) | 0 | 5 | 10 | 0 | 0 | 5 | 0 | 0 | 5 | 0 | |
| SBS (part) | 0 | 5 | 0 | 0 | 5 | 0 | 0 | 10 | 0 | 0 | |
| Test result | Tensile strength MPa | 110 | 125 | 114 | 120 | 127 | 118 | 119 | 119 | 115 | 80 |
| Bending elastic modulus MPa | 7600 | 7800 | 7700 | 8900 | 8500 | 8700 | 8600 | 7800 | 7400 | 5000 | |
| Heat-drawn wire ℃ | 108 | 109 | 107 | 114 | 110 | 108 | 111 | 106 | 104 | 100 | |
| Notched Izod impact strength (kilogram * cm/) | 9.2 | 9.0 | 9.5 | 6.5 | 8.7 | 7.0 | 6.7 | 7.5 | 8.5 | 6.0 | |
Claims (5)
1, a kind of thermoplastic compounds as fan material comprises in parts by weight:
(a) 30～70 parts of vinylbenzene-vinyl cyanide random copolymerss, wherein vinyl cyanide is 20～35% by weight percentage;
(b) 10～40 parts of non-twist long glass fibress;
(c) 10～30 parts of vinylbenzene-maleic anhydride random copolymers or vinyl toluene-maleic anhydride random copolymer, wherein maleic anhydride is 5～25% by weight percentage;
(d) at least a 0.1～2.0 part of superoxide, this superoxide are that the special butyl ester of isopropyl benzene hydroperoxide, peroxidation phenylformic acid, general formula are R
1O-OR
2Dialkyl peroxide or general formula be R
3The alkyl peroxide of O-OH, R in the formula
1, R
2Or R
3Be respectively C
1～C
10Alkyl.
2, according to the described thermoplastic compounds of claim 1 as fan material, it is characterized in that described vinylbenzene-vinyl cyanide random copolymers counts 45～65 parts with parts by weight, glass fibre is 20～30 parts, vinylbenzene-maleic anhydride random copolymer or vinyl toluene-maleic anhydride random copolymer are 15～25 parts, and described superoxide is 0.3～1.5 part.
3, according to the described thermoplastic compounds of claim 1, it is characterized in that described R as fan material
1, R
2Or R
3Be respectively C
3～C
6Alkyl.
4, according to the described thermoplastic compounds of claim 1 as fan material, it is at least a to it is characterized in that said composition also contains in vinylbenzene-divinyl-acrylonitrile copolymer, methyl methacrylate-divinyl-phenylethene grafted copolymer or the vinylbenzene-divinyl-styrene block copolymer, and its parts by weight are 5～15.
5, according to the described thermoplastic compounds of claim 4 as fan material, it is at least a to it is characterized in that said composition also contains in vinylbenzene-divinyl-acrylonitrile copolymer, methyl methacrylate-divinyl-phenylethene grafted copolymer or the vinylbenzene-divinyl-styrene block copolymer, and its parts by weight are 5～10.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011050071A CN1158348C (en) | 2001-01-03 | 2001-01-03 | Thermoplastic composition capable of being used as fan material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011050071A CN1158348C (en) | 2001-01-03 | 2001-01-03 | Thermoplastic composition capable of being used as fan material |
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| CN1158348C true CN1158348C (en) | 2004-07-21 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102516681B (en) * | 2011-11-23 | 2013-07-24 | 四川朗迪塑胶电器有限公司 | Glass-fiber-reinforced AS (acrylonitrile-styrene) resin antistatic material and preparation method |
| CN106751410A (en) * | 2016-12-28 | 2017-05-31 | 宁波朗迪叶轮机械有限公司 | A kind of band auxiliary blade axial-flow leaf and preparation method thereof |
| CN106751101A (en) * | 2016-12-28 | 2017-05-31 | 宁波朗迪叶轮机械有限公司 | A kind of through-flow fan blade at variable air-out angle and preparation method thereof |
| CN106751317A (en) * | 2016-12-28 | 2017-05-31 | 宁波朗迪叶轮机械有限公司 | A kind of axial-flow leaf and preparation method thereof |
| CN106751411A (en) * | 2016-12-28 | 2017-05-31 | 宁波朗迪叶轮机械有限公司 | A kind of oblique flow fan blade and preparation method thereof |
| CN106751316A (en) * | 2016-12-28 | 2017-05-31 | 宁波朗迪叶轮机械有限公司 | A kind of axial wheel and preparation method thereof |
| CN106751102A (en) * | 2016-12-28 | 2017-05-31 | 宁波朗迪叶轮机械有限公司 | A kind of through-flow fan blade and preparation method thereof |
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