CN114262489A - Perspective eraser and preparation method thereof - Google Patents
Perspective eraser and preparation method thereof Download PDFInfo
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- CN114262489A CN114262489A CN202111308515.4A CN202111308515A CN114262489A CN 114262489 A CN114262489 A CN 114262489A CN 202111308515 A CN202111308515 A CN 202111308515A CN 114262489 A CN114262489 A CN 114262489A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 229920000915 polyvinyl chloride Polymers 0.000 claims abstract description 19
- 239000004800 polyvinyl chloride Substances 0.000 claims abstract description 19
- 239000004014 plasticizer Substances 0.000 claims abstract description 18
- 239000011347 resin Substances 0.000 claims abstract description 17
- 229920005989 resin Polymers 0.000 claims abstract description 17
- 239000007787 solid Substances 0.000 claims abstract description 15
- 239000003381 stabilizer Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 6
- 239000002002 slurry Substances 0.000 claims description 42
- 239000012188 paraffin wax Substances 0.000 claims description 29
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- 238000001914 filtration Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- QEOWFDYSNYCPRK-UHFFFAOYSA-N OCC[Na] Chemical compound OCC[Na] QEOWFDYSNYCPRK-UHFFFAOYSA-N 0.000 claims description 11
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 11
- 239000003549 soybean oil Substances 0.000 claims description 10
- 235000012424 soybean oil Nutrition 0.000 claims description 10
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 9
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 9
- 239000003240 coconut oil Substances 0.000 claims description 9
- 235000019864 coconut oil Nutrition 0.000 claims description 9
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 claims description 9
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 claims description 7
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 claims description 7
- 239000003921 oil Substances 0.000 claims description 7
- 235000019198 oils Nutrition 0.000 claims description 7
- 150000002942 palmitic acid derivatives Chemical class 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 239000010419 fine particle Substances 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 229920001944 Plastisol Polymers 0.000 abstract description 8
- 239000004999 plastisol Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 239000012535 impurity Substances 0.000 abstract description 4
- 239000003963 antioxidant agent Substances 0.000 abstract description 3
- 230000003078 antioxidant effect Effects 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 238000002425 crystallisation Methods 0.000 abstract description 2
- 230000008025 crystallization Effects 0.000 abstract description 2
- 239000011521 glass Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 239000012780 transparent material Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000004383 yellowing Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000001055 blue pigment Substances 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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Abstract
In the traditional eraser preparation process, even if the used materials are transparent materials, due to the difference between polyvinyl chloride powder and polyvinyl chloride paste resin, in addition, the obtained eraser can only achieve the semitransparent effect through dynamic processes such as plasticizing, granulating, extruding and the like in the preparation process, and the mirror transparency of the product cannot occur due to incomplete glass state on the surface. Compared with the prior art, the polyvinyl chloride paste resin, the plasticizer, the stabilizer, the antioxidant, the wear-resisting agent and the like are uniformly mixed to be made into paste, then impurities in the paste are filtered to be uniform polyvinyl chloride plastisol, the plastisol is defoamed to remove the impurities in the plastisol, then the plastisol is kept stand for crystallization at a specific temperature, and is solidified into a transparent solid along with the temperature change.
Description
Technical Field
The invention relates to the field of erasers, in particular to a perspective eraser and a preparation method thereof.
Background
The eraser is a stationery product for children, is mainly used for erasing wrong lines and wrong handwriting, and utilizes the physical principle to strip the handwriting off substances on the surface of a written object. With the development of the times, rubber products with various shapes and purposes emerge endlessly.
The traditional transparent eraser is generally prepared from polyvinyl chloride resin powder, silicon dioxide, an antioxidant and the like by a traditional extrusion or calendering process. The prepared product has the defects of unsmooth surface, low transparency, easy breakage, poor character wiping performance and the like.
In the traditional eraser preparation process, even if the used materials are transparent materials, due to the difference between polyvinyl chloride powder and polyvinyl chloride paste resin, in addition, the obtained eraser can only achieve the semitransparent effect through dynamic processes such as plasticizing, granulating, extruding and the like in the preparation process, and the mirror transparency of the product cannot occur due to incomplete glass state on the surface.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a perspective eraser and a preparation method thereof.
The object of the invention is achieved in the following way: a perspective eraser is prepared from the following components in parts by weight: 45-55 parts of polyvinyl chloride paste resin; 45-60 parts of a plasticizer; 0.1-0.5 part of paraffin; 0.1-0.5 part of coconut oil base hydroxyethyl sodium sulfonate; 0.1-0.5 part of organic tin stabilizer; 1-8 parts of epoxidized soybean oil; 0 to 0.5 portion of calcium carbonate and 0.0001 to 0.0005 portion of phthalocyanine blue.
Further, the plasticizer is one or more of chlorinated palmitic acid oil, dioctyl phthalate and chlorinated paraffin.
Further, the paraffin is solid transparent paraffin.
A preparation method of a perspective eraser is characterized in that the perspective eraser is prepared from the following components in parts by weight: 45-55 parts of polyvinyl chloride paste resin; 45-60 parts of a plasticizer; 0.1-0.5 part of paraffin; 0.1-0.5 part of coconut oil base hydroxyethyl sodium sulfonate; 0.1-0.5 part of organic tin stabilizer; 1-8 parts of epoxidized soybean oil; 0 to 0.5 portion of calcium carbonate and 0.0001 to 0.0005 portion of phthalocyanine blue;
the preparation method comprises the following steps:
(1) preparing slurry: starting stirring, adding all the raw materials into homogenizing equipment according to the proportion, opening a vacuum device, vacuumizing and defoaming while stirring, and stopping stirring when fine particles are hardly contained in the slurry;
(2) filtering the slurry: filtering the slurry through a filter screen, and continuously placing the obtained slurry in a homogenizer for standing, vacuumizing and defoaming;
(3) grouting a mould: opening a valve of a feed opening of the homogenizer, controlling the slurry to slowly and uniformly fill the mold through a receiving opening of the mold,
(4) curing and forming: placing the mould in heating equipment, starting to heat, staying at the temperature of 120-130 ℃ for 1.3-1.7 hours, solidifying the slurry into a transparent solid, removing the obtained product from the heating device, and cooling to room temperature;
(5) and (4) slitting and packaging the product prepared in the step (4).
Further, the die in the step (3) is a square die with the length, width and height respectively being integral multiples of the length, width and height of the single rubber to be manufactured.
Compared with the prior art, the polyvinyl chloride paste resin, the plasticizer, the stabilizer, the antioxidant, the wear-resisting agent and the like are uniformly mixed to be made into paste, then impurities in the paste are filtered to be uniform polyvinyl chloride plastisol, the plastisol is defoamed to remove the impurities in the paste, then the paste is kept stand for crystallization at a specific temperature, the plastisol is solidified into a transparent solid along with the temperature change, and different from the traditional polyvinyl chloride eraser, the process can achieve a complete transparent effect by directly crystallizing and molding the liquid state plastisol, has full transparency, and the product has crystal transparency, and can see objects below clearly through the upper layer without obstruction; and has excellent word eliminating effect and can be wiped to form a line.
Drawings
FIG. 1 is a first practical diagram of the transparent eraser manufactured by the scheme of the invention.
FIG. 2 is a second embodiment of the transparent eraser according to the present invention.
Detailed Description
Example 1:
the perspective eraser is prepared from the following components in parts by weight: 45-55 parts of polyvinyl chloride paste resin; 45-60 parts of a plasticizer; 0.1-0.5 part of paraffin; 0.1-0.5 part of coconut oil base hydroxyethyl sodium sulfonate; 0.1-0.5 part of organic tin stabilizer; 1-8 parts of epoxidized soybean oil; 0 to 0.5 portion of calcium carbonate and 0.0001 to 0.0005 portion of phthalocyanine blue.
The manufacturing method comprises the following steps:
(1) preparing slurry: starting stirring, adding all the raw materials into homogenizing equipment according to the proportion, opening a vacuum device, and stirring while vacuumizing for defoaming. Stopping stirring when the slurry almost has no fine particles;
(2) filtering the slurry: filtering the slurry through a filter screen, and continuously placing the obtained slurry in a homogenizer for standing, vacuumizing and defoaming;
(3) grouting a mould: opening a valve of a feed opening of the homogenizer, and controlling the slurry to slowly and uniformly fill the mold through a receiving opening of the mold;
(4) curing and forming: placing the mould in heating equipment, starting to heat, staying at the temperature of 120-130 ℃ for 1.3-1.7 hours, solidifying the slurry into a transparent solid, removing the obtained product from the heating device, and cooling to room temperature;
(5) and (4) slitting and packaging the product prepared in the step (4).
The plasticizer is one or more of chlorinated palmitic acid oil, dioctyl phthalate and chlorinated paraffin.
The paraffin is solid transparent paraffin.
Further, the die in the step (3) is a square die with the length, width and height respectively being integral multiples of the length, width and height of the single rubber to be manufactured.
Compared with the prior art, the resin used in the invention is polyvinyl chloride paste resin, preferably the resin is Japanese Brillouin PH-12, and the plasticizer is one or more of chlorinated palmitic acid oil, dioctyl phthalate and chlorinated paraffin; the plasticizer has excellent transparency and plasticizing capacity. The paraffin wax is preferably a solid transparent paraffin wax, which enhances the flexibility of the product. The stabilizer is coconut oil-based hydroxyethyl sodium sulfonate, an organic tin stabilizer and epoxidized soybean oil; wherein, the transparency of the product is reduced by adding too much cocoyl hydroxyethyl sodium sulfonate, so the dosage of the cocoyl hydroxyethyl sodium sulfonate is strictly controlled; the stabilizer can keep the stability of the product and prevent the product from yellowing; the addition of epoxidized soybean oil can improve the yellowing resistance of the product and can also plasticize the resin better. The addition of a small amount of calcium carbonate does not affect the transparency of the product, and can improve the friction force of the product, ensure that the product is easy to fall off and improve the wiping performance of the product. The addition of a trace amount of phthalocyanine blue pigment makes the product appear light blue and look thicker.
The perspective eraser has full transparency, and the product has crystal transparency, so that objects below can be seen through the upper layer without obstruction. And has excellent word eliminating effect and can be wiped to form a line.
Example 2:
the perspective eraser is prepared from the following components in parts by weight: 45 parts of polyvinyl chloride paste resin; 48 parts of a plasticizer; 0.5 part of paraffin; 0.25 part of coconut oil base hydroxyethyl sodium sulfonate; 0.25 part of organic tin stabilizer; 5.5 parts of epoxidized soybean oil; 0.5 part of calcium carbonate and 0.0001 part of phthalocyanine blue.
The manufacturing method comprises the following steps:
(1) preparing slurry: starting stirring, adding all the raw materials into homogenizing equipment according to the proportion, opening a vacuum device, and stirring while vacuumizing for defoaming. Stopping stirring when the slurry almost has no fine particles;
(2) filtering the slurry: filtering the slurry through a filter screen, and continuously placing the obtained slurry in a homogenizer for standing, vacuumizing and defoaming;
(3) grouting a mould: opening a valve of a feed opening of the homogenizer, and controlling the slurry to slowly and uniformly fill the mold through a receiving opening of the mold;
(4) curing and forming: placing the mould in heating equipment, starting to heat, staying at 125 ℃ for 1.5 hours, curing the slurry into a transparent solid, removing the obtained product from the heating equipment, and cooling to room temperature;
(5) and (4) slitting and packaging the product prepared in the step (4).
The plasticizer is one or more of chlorinated palmitic acid oil, dioctyl phthalate and chlorinated paraffin.
The paraffin is solid transparent paraffin.
Further, the die in the step (3) is a square die with the length, width and height respectively being integral multiples of the length, width and height of the single rubber to be manufactured.
Example 3
The perspective eraser is prepared from the following components in parts by weight: 48 parts of polyvinyl chloride paste resin; 45 parts of a plasticizer; 0.5 part of paraffin; 0.25 part of coconut oil base hydroxyethyl sodium sulfonate; 0.25 part of organic tin stabilizer; 5.5 parts of epoxidized soybean oil; 0.5 part of calcium carbonate and 0.0003 part of phthalocyanine blue.
The manufacturing method comprises the following steps:
(1) preparing slurry: starting stirring, adding all the raw materials into homogenizing equipment according to the proportion, opening a vacuum device, and stirring while vacuumizing for defoaming. Stopping stirring when the slurry almost has no fine particles;
(2) filtering the slurry: filtering the slurry through a filter screen, and continuously placing the obtained slurry in a homogenizer for standing, vacuumizing and defoaming;
(3) grouting a mould: opening a valve of a feed opening of the homogenizer, and controlling the slurry to slowly and uniformly fill the mold through a receiving opening of the mold;
(4) curing and forming: placing the mould in heating equipment, starting to heat, staying at the temperature of 130 ℃ for 1.4 hours, curing the slurry into a transparent solid, removing the obtained product from the heating equipment, and cooling to room temperature;
(5) and (4) slitting and packaging the product prepared in the step (4).
The plasticizer is one or more of chlorinated palmitic acid oil, dioctyl phthalate and chlorinated paraffin.
The paraffin is solid transparent paraffin.
Further, the die in the step (3) is a square die with the length, width and height respectively being integral multiples of the length, width and height of the single rubber to be manufactured.
Example 4
The perspective eraser is prepared from the following components in parts by weight: 46 parts of polyvinyl chloride paste resin; 47 parts of a plasticizer; 0.2 part of paraffin; 0.45 part of coconut oil base hydroxyethyl sodium sulfonate; 0.45 part of organic tin stabilizer; 5.5 parts of epoxidized soybean oil; 0.4 part of calcium carbonate and 0.0005 part of phthalocyanine blue.
The manufacturing method comprises the following steps:
(1) preparing slurry: starting stirring, adding all the raw materials into homogenizing equipment according to the proportion, opening a vacuum device, and stirring while vacuumizing for defoaming. Stopping stirring when the slurry almost has no fine particles;
(2) filtering the slurry: filtering the slurry through a filter screen, and continuously placing the obtained slurry in a homogenizer for standing, vacuumizing and defoaming;
(3) grouting a mould: opening a valve of a feed opening of the homogenizer, and controlling the slurry to slowly and uniformly fill the mold through a receiving opening of the mold;
(4) curing and forming: placing the mould in heating equipment, starting to heat, staying at the temperature of 120 ℃ for 1.7 hours, curing the slurry into a transparent solid, removing the obtained product from the heating equipment, and cooling to room temperature;
(5) and (4) slitting and packaging the product prepared in the step (4).
The plasticizer is one or more of chlorinated palmitic acid oil, dioctyl phthalate and chlorinated paraffin.
The paraffin is solid transparent paraffin.
Further, the die in the step (3) is a square die with the length, width and height respectively being integral multiples of the length, width and height of the single rubber to be manufactured.
The properties of the eraser are as follows: the detection items and the detection method are strictly executed according to (QB/T2309-2010).
Appearance: sensory examination in the bright spots.
Light transmittance: the test was carried out with a luminometer.
Hardness: and (3) adopting a Shore hardness tester, enabling a pressing needle to vertically and lightly contact the surface of the pressurized test sample, immediately and correctly reading the scales, testing at three different positions of each test sample, and taking the average value of the scales as the hardness of the test sample.
Word elimination rate: the test is carried out according to the eraser erasure rate test method.
Mobility: a HB pencil conforming to QB/T2774-2006 was cut into 40mm long pieces, and two of these pencils were placed in parallel on a test piece having a length of 35mm, a width of 15mm or more and a thickness of 5mm or more (placed along the long side of the test piece). The pen was loaded with 0.2kg (0.196N) of load and placed in a thermostat at 60. + -. 2 ℃. After 60min, the pencil was taken out, and the pencil was examined for the presence of the coating adhering to the test piece and the presence of migration was visually examined.
Yellowing performance: the eraser was baked in an oven at 50 ℃ for 7 days and observed to have yellowing.
The above properties are measured at room temperature of 25 ℃ except the measurement method required by national standards.
Specific results are shown in the following table; FIG. 1 and FIG. 2 show a perspective eraser prepared by the method of the present invention.
The results shown in the above tables and figures indicate that the eraser of the present invention has good transparency and erasing performance.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the overall concept of the present invention, and these should also be considered as the protection scope of the present invention.
Claims (5)
1. A perspective eraser is characterized in that:
the transparent eraser is prepared from the following components in parts by weight: 45-55 parts of polyvinyl chloride paste resin; 45-60 parts of a plasticizer; 0.1-0.5 part of paraffin; 0.1-0.5 part of coconut oil base hydroxyethyl sodium sulfonate; 0.1-0.5 part of organic tin stabilizer; 1-8 parts of epoxidized soybean oil; 0 to 0.5 portion of calcium carbonate and 0.0001 to 0.0005 portion of phthalocyanine blue.
2. The perspective eraser as claimed in claim 1, wherein: the plasticizer is one or more of chlorinated palmitic acid oil, dioctyl phthalate and chlorinated paraffin.
3. The perspective eraser as claimed in claim 1, wherein: the paraffin is solid transparent paraffin.
4. A preparation method of a perspective eraser is characterized in that:
the perspective eraser is prepared from the following components in parts by weight: 45-55 parts of polyvinyl chloride paste resin; 45-60 parts of a plasticizer; 0.1-0.5 part of paraffin; 0.1-0.5 part of coconut oil base hydroxyethyl sodium sulfonate; 0.1-0.5 part of organic tin stabilizer; 1-8 parts of epoxidized soybean oil; 0 to 0.5 portion of calcium carbonate and 0.0001 to 0.0005 portion of phthalocyanine blue;
the preparation steps are as follows:
(1) preparing slurry: starting stirring, adding all the raw materials into homogenizing equipment according to the proportion, opening a vacuum device, vacuumizing and defoaming while stirring, and stopping stirring when fine particles are hardly contained in the slurry;
(2) filtering the slurry: filtering the slurry through a filter screen, and continuously placing the obtained slurry in a homogenizer for standing, vacuumizing and defoaming;
(3) grouting a mould: opening a valve of a feed opening of the homogenizer, controlling the slurry to slowly and uniformly fill the mold through a receiving opening of the mold,
(4) curing and forming: placing the mould in heating equipment, starting to heat, staying at the temperature of 120-130 ℃ for 1.3-1.7 hours, solidifying the slurry into a transparent solid, removing the obtained product from the heating device, and cooling to room temperature;
(5) and (4) slitting and packaging the product prepared in the step (4).
5. The method for preparing a transparent eraser as claimed in claim 4, wherein: the die in the step (3) is a square die with the length, width and height respectively being integral multiples of the length, width and height of the single rubber to be manufactured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111308515.4A CN114262489A (en) | 2021-11-05 | 2021-11-05 | Perspective eraser and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111308515.4A CN114262489A (en) | 2021-11-05 | 2021-11-05 | Perspective eraser and preparation method thereof |
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| CN114262489A true CN114262489A (en) | 2022-04-01 |
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| CN202111308515.4A Pending CN114262489A (en) | 2021-11-05 | 2021-11-05 | Perspective eraser and preparation method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090209686A1 (en) * | 2008-02-19 | 2009-08-20 | Tombow Pencil Co., Ltd. | Eraser |
| CN103483228A (en) * | 2013-10-16 | 2014-01-01 | 吉林伊捷思化学有限公司 | Preparation method of sodium hydroxyethyl sulfonate fatty acid ester |
| CN106398048A (en) * | 2016-09-28 | 2017-02-15 | 上海兆方文具有限公司 | Eraser and composition thereof |
| CN106751143A (en) * | 2016-11-29 | 2017-05-31 | 金华博科彩泥技术研发有限公司 | Make clay of erasing rubber and preparation method thereof by oneself |
| CN110128762A (en) * | 2019-05-09 | 2019-08-16 | 蔡汉鑫 | A kind of preparation method of environment-friendly PVC three-dimensional modeling erasing rubber |
-
2021
- 2021-11-05 CN CN202111308515.4A patent/CN114262489A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090209686A1 (en) * | 2008-02-19 | 2009-08-20 | Tombow Pencil Co., Ltd. | Eraser |
| CN103483228A (en) * | 2013-10-16 | 2014-01-01 | 吉林伊捷思化学有限公司 | Preparation method of sodium hydroxyethyl sulfonate fatty acid ester |
| CN106398048A (en) * | 2016-09-28 | 2017-02-15 | 上海兆方文具有限公司 | Eraser and composition thereof |
| CN106751143A (en) * | 2016-11-29 | 2017-05-31 | 金华博科彩泥技术研发有限公司 | Make clay of erasing rubber and preparation method thereof by oneself |
| CN110128762A (en) * | 2019-05-09 | 2019-08-16 | 蔡汉鑫 | A kind of preparation method of environment-friendly PVC three-dimensional modeling erasing rubber |
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