CN102516704B - Waterproof material and its preparation method - Google Patents
Waterproof material and its preparation method Download PDFInfo
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- CN102516704B CN102516704B CN 201110434276 CN201110434276A CN102516704B CN 102516704 B CN102516704 B CN 102516704B CN 201110434276 CN201110434276 CN 201110434276 CN 201110434276 A CN201110434276 A CN 201110434276A CN 102516704 B CN102516704 B CN 102516704B
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- 239000000463 material Substances 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 19
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 229920000642 polymer Polymers 0.000 claims abstract description 10
- -1 dicyclopentadiene hydrocarbon Chemical class 0.000 claims abstract description 9
- 229920001778 nylon Polymers 0.000 claims abstract description 8
- 229930195734 saturated hydrocarbon Natural products 0.000 claims abstract description 7
- 239000004677 Nylon Substances 0.000 claims abstract description 6
- 239000000835 fiber Substances 0.000 claims abstract description 6
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 229910052740 iodine Inorganic materials 0.000 claims abstract description 5
- 239000011630 iodine Substances 0.000 claims abstract description 5
- 238000009435 building construction Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 12
- 239000000047 product Substances 0.000 claims description 11
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Natural products CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 10
- 150000002430 hydrocarbons Chemical class 0.000 claims description 10
- 229920001971 elastomer Polymers 0.000 claims description 9
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 8
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 8
- 229920001195 polyisoprene Polymers 0.000 claims description 7
- 239000003469 silicate cement Substances 0.000 claims description 5
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 4
- ZSWFCLXCOIISFI-UHFFFAOYSA-N cyclopentadiene Chemical compound C1C=CC=C1 ZSWFCLXCOIISFI-UHFFFAOYSA-N 0.000 claims description 4
- 239000012467 final product Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 claims description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 2
- 238000006555 catalytic reaction Methods 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000006116 polymerization reaction Methods 0.000 claims description 2
- 125000003944 tolyl group Chemical group 0.000 claims 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical group [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims 1
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims 1
- 125000003454 indenyl group Chemical class C1(C=CC2=CC=CC=C12)* 0.000 claims 1
- 238000004132 cross linking Methods 0.000 abstract 2
- 239000011398 Portland cement Substances 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 abstract 1
- 229920003049 isoprene rubber Polymers 0.000 abstract 1
- 238000002156 mixing Methods 0.000 abstract 1
- 238000003756 stirring Methods 0.000 abstract 1
- 238000005303 weighing Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 7
- 239000004568 cement Substances 0.000 description 5
- 230000008602 contraction Effects 0.000 description 5
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 125000002837 carbocyclic group Chemical group 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000032798 delamination Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- 244000286663 Ficus elastica Species 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000001684 chronic effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000011243 crosslinked material Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 150000002469 indenes Chemical class 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- RGSFGYAAUTVSQA-UHFFFAOYSA-N pentamethylene Natural products C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 description 1
- 125000004817 pentamethylene group Chemical group [H]C([H])([*:2])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[*:1] 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
A waterproof material contains the following raw materials of: by weight, 30-60 parts of LAL saturated hydrocarbon oil, 15-30 parts of cis-isoprene rubber, 20-50 parts of a dicyclopentadiene hydrocarbon polymer, 0-30 parts of napthene, 10-20 parts of portland cement, 10-20 parts of hydroxide and 3-10 parts of nylon short fiber. The waterproof material can be used as a waterproof material for building construction. A preparation method of the waterproof material comprises the following steps of: weighing each component according to amounts by weight of various raw materials, mixing the raw materials for cross linking reaction to obtain a product with iodine value being within 15, followed by cooling and discharging, wherein the cross linking reaction is carried out at the temperature of 120-360 DEG C and at the pressure of 1-2.5 MPa while keeping warm and stirring for more than 6 hours.
Description
Technical field
The present invention relates to a kind of water-proof material, especially a kind of have good high temperature resistant and the cryogenic temperature variation, and energy and cement, concrete form the building construction water-proof material of same shrinkage rates, and it comprises the raw materials such as polymer rubber resin and silicate.The invention still further relates to the preparation method of this water-proof material, belong to petrochemical complex, fine chemical technology field.
Background technology
Because the northern area winter summer temperature difference is larger, water-proof material is subjected to the reasons such as concrete surface contraction ratio row difference and sleet and snow ice for many years, and house WATER REPELLENT problem never is well solved.Its major cause is that the water-proof material contraction ratio that the variation of summer in winter temperature processes the methods such as concrete shrinkage ratio and " three oily two felts " used, urethane is inconsistent, thereby form delamination breach phenomenon, cause chronic water inlet, the delamination breach can be more and more serious after running into several ice and snow, the waterproof life-span reduces, and has formed the difficult problem that water inlet is every year repaired every year.
The present invention is theoretical according to new waterproof, sets about from improving the storeroom contraction ratio, has made a kind ofly with colloidality and elastic water-proof material, and it is sticked on the concrete construction top layer, can keep long-term elasticity and stronger sticking power.This water-proof material high temperature resistant and indeformable flowing in summer, do not chap winter.This water-proof material is dissolved in the concrete cement top layer, and is identical with concrete cold and hot contraction ratio.Add again attached silicate protective layer on this top layer and further strengthen corrosion-resistant, ageing resistance, form the protective layer that one deck has good springiness, high temperature resistant, anti-be full of cracks, reach the effect of waterproof.
Summary of the invention
The technical problem of solution required for the present invention is the deficiency that overcomes existing waterproof technique, a kind of weathering resistance is provided, the multiple material homogeneous phase mixes, the waterproof material that cold and hot shrinkage rates is consistent, and efficiently solving for many years, the water-proof material climate changes and the difficult problem of damage.
The objective of the invention is to be achieved through the following technical solutions.
A kind of water-proof material comprises the raw material of following weight part.
The saturated hydrocarbon ils 20-60 of LAL part, cis polyisoprene rubber 15-30 part, dicyclopentadiene hydrocarbon polymer 20-50 part, naphthenic hydrocarbon 0-30 part, silicate cement 10-20 part, oxyhydroxide 10-20 part, nylon short fibre 3-10 part.
Preferred each parts by weight of raw materials is the saturated hydrocarbon ils 30-40 of LAL part, cis polyisoprene rubber 15-25 part, dicyclopentadiene hydrocarbon polymer 20-40 part, naphthenic hydrocarbon 0-30 part, silicate cement 10-20 part, oxyhydroxide 10-20 part, nylon short fibre 5-6 part.
Wherein the saturated hydrocarbon ils of said LAL can prepare by the following method:
(1) take each component by following weight part: vinylbenzene 30-45 part, indenes 5-15 part, vinyl toluene 0-5 part, boron trioxide catalyzer 0.05-0.5 part, auxiliary 100-150 part, wherein said auxiliary can be toluene or dimethylbenzene.
(2) each raw material under step (1) is mixed carry out the boron trioxide catalyzed polymerization, reaction conditions is middle temperature, two sections polyreactions of high temperature.
(3) with the resulting product standing demix of step (2), take off layer liquid and slough residual fraction, obtain body of paste.
The said qualified product of polyisoprene rubber from cis-rubber or trans rubber plant of taking advantage of a situation wherein.
Wherein said dicyclopentadiene hydrocarbon polymer can prepare by the following method:
(1) take each component by following weight part: cyclopentadiene 80-100 part, vinyl toluene 30-40 part, dication aluminum chloride 0.1-1 part, auxiliary 100-200 part, wherein said auxiliary can be toluene or dimethylbenzene.
(2) described each raw material of step (1) is mixed carries out the dication catalyzed reaction, reaction conditions is middle pyroreaction.
(3) with the resulting product standing demix of step (2), take off layer liquid and slough residual fraction, obtain body of paste.
Wherein said naphthenic hydrocarbon can be the ring texture compound of general formula CnH2n, and wherein n is the integer of 1-30, and its main body is not carbochain but carbocyclic ring can be for example pentamethylene, hexanaphthene etc., for example five carbocyclic rings or hydrogenation of six carbocyclic.
Wherein said silicate cement comes from the 425# cement in cement mill.
The preferred hydrochlorinate aluminium of said oxyhydroxide wherein, its content is more than 96%, and is Powdered.
Wherein said nylon short fibre is the material of old tire processing or byproduct.
Another technical problem to be solved by this invention is to provide a kind of preparation method of above-mentioned water-proof material, especially the preparation method of house water-proof building material.
This method comprises:
1) weight part by above-mentioned materials takes each raw material
2) various raw materials mixed carry out the Cross-linked reaction, obtain iodine value 15 with interior product, cooling discharge and get final product.
The reaction of wherein said Cross-linked is preferably carried out under temperature is the condition of 120 ℃-360 ℃, and more preferably 160 ℃-300 ℃ of temperature, pressure is insulated and stirred more than 6 hours under the condition of 1.5-2 MPa.
Products made thereby of the present invention is non-volatile paste elastomerics, has well cold-resistant, resistance toheat, can directly construct on cement concrete surface; It has identical shrinkage rates with concrete, not affected by the building surface convergent force; Its top layer is subjected to the silicates substance protection, affected by ultraviolet ray little, the indeformable trickling of elastomerics during high temperature, and during low temperature, elastomerics does not chap, but slight distortion self-healing.This product has the elasticity digestion time and keeps lasting, and the advantages such as good stability, easy construction have been improved the shortcoming of former waterproof material from mechanism.After water-proof material self monomer sulfuration is cross-linked into and is integrated, then make its surperficial hot melt or add surface layer adhesive bonding or be sprayed on concrete surface with heating means, form cross-linked material.Method of the prior art method as roasting sticking in " four oily three felts " and urethane crosslinks method be all the form existence of solidifying separately after construction, can tear from monoblock on concrete after stressed.The place immersion if be affected by thermal expansion and contraction will be by the larger immersion point of freezing spreading under the condition of sleet and snow ice, and will form delamination by expanding the coming year, its waterproof lost damaged, and repairs difficulty.And paste elastomerics of the present invention immerses building concrete, exists with the form of elasticity top layer protection, is difficult to tear from concrete, remains the elastic moval state, be not heated rise, the infringement of freezing up, thereby reach the purpose of excellent waterproof.
Embodiment
Embodiment 1
Take each raw material by following weight
1, LAL protection hydrocarbon ils: 28 parts
2, polyisoprene rubber: 15 parts
3, dicyclopentadiene hydrocarbon polymer: 20 parts
4, naphthenic hydrocarbon: 2 parts
5, silicate: 10 parts
6, hydrochlorinate aluminium: 10 parts
7, nylon fiber: 5 parts
Various raw materials are mixed carry out the Cross-linked reaction, obtain iodine value 15 with interior product, cooling discharge and get final product, wherein the Cross-linked reaction is 120 ℃-360 ℃ in temperature, pressure is insulated and stirred more than 6 hours under the condition of 1-2.5 MPa.
Embodiment 2
Take each raw material by following weight
1. LAL protects hydrocarbon ils: 48 parts
2. polyisoprene rubber: 30 parts
3. dicyclopentadiene hydrocarbon polymer: 50 parts
4. naphthenic hydrocarbon: 20 parts
5. silicate: 20 parts
6. hydrochlorinate aluminium: 20 parts
7. nylon fiber: 9 parts
Various raw materials are mixed carry out the Cross-linked reaction, obtain iodine value 15 with interior product, cooling discharge and get final product, wherein the Cross-linked reaction is 160 ℃-300 ℃ in temperature, pressure is insulated and stirred more than 6 hours under the condition of 1-2.5 MPa.
Claims (7)
1. water-proof material comprises the raw material of following weight part:
The saturated hydrocarbon ils 20-60 of LAL part, cis polyisoprene rubber 15-30 part, dicyclopentadiene hydrocarbon polymer 20-50 part, naphthenic hydrocarbon 0-30 part, silicate cement 10-20 part, oxyhydroxide 10-20 part, nylon short fibre 3-10 part;
The saturated hydrocarbon ils of said LAL prepares by the following method:
(1) take each component by following weight part: vinylbenzene 30-45 part, indenes 5-15 part, vinyl toluene 0-5 part, boron trioxide catalyzer 0.05-0.5 part, auxiliary 100-150 part, wherein said auxiliary is toluene or dimethylbenzene;
(2) each raw material under step (1) is mixed carry out the boron trioxide catalyzed polymerization, reaction conditions is middle temperature, two sections polyreactions of high temperature;
(3) with the resulting product standing demix of step (2), take off layer liquid and slough residual fraction, obtain body of paste;
Said dicyclopentadiene hydrocarbon polymer prepares by the following method:
(1) take each component by following weight part: cyclopentadiene 80-100 part, vinyl toluene 30-40 part, dication aluminum chloride 0.1-1 part, auxiliary 100-200 part, wherein said auxiliary is toluene or dimethylbenzene;
(2) described each raw material of step (1) is mixed carries out the dication catalyzed reaction, reaction conditions is the medium and high temperature reaction;
(3) with the resulting product standing demix of step (2), take off layer liquid and slough residual fraction, obtain body of paste.
2. said water-proof material according to claim 1 is characterized in that the weight part of each raw material is:
The saturated hydrocarbon ils 30-40 of LAL part, cis polyisoprene rubber 15-25 part, dicyclopentadiene hydrocarbon polymer 20-40 part, naphthenic hydrocarbon 0-30 part, silicate cement 10-20 part, oxyhydroxide 10-20 part, nylon short fibre 5-6 part.
3. said water-proof material according to claim 1 and 2, wherein said naphthenic hydrocarbon is the ring texture compound of general formula CnH2n, wherein n is the integer of 1-30.
4. said water-proof material according to claim 1 and 2, wherein said oxyhydroxide is aluminium hydroxide.
5. the preparation method of claim 1 or 2 said water-proof material comprises the following steps:
1) weight part by various raw materials takes each component;
2) various raw materials mixed carry out the Cross-linked reaction, obtain iodine value 15 with interior product, cooling discharge and get final product, wherein the Cross-linked reaction is 120 ℃-360 ℃ in temperature, pressure is insulated and stirred more than 6 hours under the condition of 1-2.5 MPa.
6. method according to claim 5, wherein said Cross-linked temperature of reaction is 160 ℃-300 ℃.
7. the described water-proof material of claim 1 or 2 is as the purposes of building construction water-proof material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110434276 CN102516704B (en) | 2011-12-22 | 2011-12-22 | Waterproof material and its preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110434276 CN102516704B (en) | 2011-12-22 | 2011-12-22 | Waterproof material and its preparation method |
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| Publication Number | Publication Date |
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| CN102516704A CN102516704A (en) | 2012-06-27 |
| CN102516704B true CN102516704B (en) | 2013-06-12 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103289145B (en) * | 2013-06-24 | 2015-05-20 | 苏州新区佳合塑胶有限公司 | Impact-resistant high-temperature-resistant plastic comprising bicyclopentadiene |
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|---|---|---|---|---|
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| EP0877057A3 (en) * | 1993-12-13 | 2002-01-23 | Daicel Chemical Industries, Ltd. | A compatible blend containing an epoxy-modified block copolymer, a process, a thermoplastic resin composition, resin compositions and an asphalt composition containing an epoxy-modified block copolymer |
| KR100533231B1 (en) * | 2004-11-15 | 2005-12-02 | 한본인더스트리 주식회사 | Stretchy rubberized asphalt felt for waterproofing and waterproofing material of duplex rubberized asphalt membrane plus felt |
| CN101121874A (en) * | 2007-08-27 | 2008-02-13 | 北京东方雨虹防水技术股份有限公司 | High heat resistance self-adhesive rubber asphalt waterproofing coiled material |
| CN101644094A (en) * | 2009-07-16 | 2010-02-10 | 北京立高科技有限公司 | Self-adhesive polymer modified bituminous polyester fiber waterproof sheet material and preparation technology thereof |
| CN101691439A (en) * | 2009-10-12 | 2010-04-07 | 宫相勤 | Method for preparing resin with good low temperature fluidity |
| CN102031002A (en) * | 2010-12-22 | 2011-04-27 | 北京东方雨虹防水技术股份有限公司 | Non-cured asphalt mastic |
| CN102093512A (en) * | 2009-12-10 | 2011-06-15 | 宫相勤 | Preparation method of resin for improving cold flow property of middle pad |
| WO2011094973A1 (en) * | 2010-02-03 | 2011-08-11 | Gong Xiangqin | Rubber tyre extender oil for improving low hysteresis loss of rubber tyre and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5765710A (en) * | 1980-10-09 | 1982-04-21 | Bridgestone Corp | Ultraviolet-or radiation-crosslinkable rubber plastic composition and waterproof sheet containing the same |
-
2011
- 2011-12-22 CN CN 201110434276 patent/CN102516704B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1238016A (en) * | 1967-10-16 | 1971-07-07 | ||
| EP0877057A3 (en) * | 1993-12-13 | 2002-01-23 | Daicel Chemical Industries, Ltd. | A compatible blend containing an epoxy-modified block copolymer, a process, a thermoplastic resin composition, resin compositions and an asphalt composition containing an epoxy-modified block copolymer |
| KR100533231B1 (en) * | 2004-11-15 | 2005-12-02 | 한본인더스트리 주식회사 | Stretchy rubberized asphalt felt for waterproofing and waterproofing material of duplex rubberized asphalt membrane plus felt |
| CN101121874A (en) * | 2007-08-27 | 2008-02-13 | 北京东方雨虹防水技术股份有限公司 | High heat resistance self-adhesive rubber asphalt waterproofing coiled material |
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Effective date of registration: 20170606 Address after: 266200, room 1208, Dexin building, 788 Ao Ao Road, Jimo, Shandong, Qingdao Patentee after: Qingdao Haijia Ajuvants Co., Ltd. Address before: 17 floor, No. 599 International Building Futai Yanqing road 266200 Jimo City, Shandong city of Qingdao Province Patentee before: Gong Xiangqin |
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Inventor after: Gong Xiangqin Inventor after: Xu Wei Inventor after: Zong Chengzhong Inventor after: Zhou Lin Inventor after: Gong Suying Inventor before: Gong Xiangqin Inventor before: Xu Wei Inventor before: Fu Li Inventor before: Wu Yonglin Inventor before: Gong Suying |
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