CN109776997B - Precision tire expanding liquid plastic and preparation and casting method thereof - Google Patents
Precision tire expanding liquid plastic and preparation and casting method thereof Download PDFInfo
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- CN109776997B CN109776997B CN201811573367.7A CN201811573367A CN109776997B CN 109776997 B CN109776997 B CN 109776997B CN 201811573367 A CN201811573367 A CN 201811573367A CN 109776997 B CN109776997 B CN 109776997B
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Abstract
The invention discloses a precision expanding liquid plastic which comprises the following raw materials in percentage by weight: 18-22% of resin, 67-71% of plasticizer, 0.9-1.1% of calcium stearate and 8-12% of vacuum oil, so that the liquid plastic can bear 500-800KG/cm2The pressure of the rubber can not leak out from a gap of 0.01mm, and the shrinkage rate is less than or equal to 5 percent.
Description
Technical Field
The invention relates to the field of precision machinery preparation, in particular to precision tire expansion liquid plastic and a preparation and pouring method thereof.
Background
With the continuous improvement of the machining precision requirement, the mechanical expanding tire can not meet the development requirement, and a novel expanding tire is required to be adopted to improve the machining precision. The liquid plastic is used as a pressure transmission medium of the precise tire expanding, has the pressure conductivity of liquid, and can keep the integrity under a certain pressure. The liquid plastic expanding tire has the advantages in the aspect of high-precision machining. To fully exploit the above advantages, liquid plastics must satisfy the following requirements as a pressure-transmitting element in a fixture: (1) the liquid plastic is easy to pour into the cavity of the clamp due to certain fluidity, can uniformly transmit pressure to the clamping element of the clamp like liquid after being pressed, and has small pressure loss; (2) the plunger has certain toughness, and can not leak from a fit clearance between the plunger and the plunger hole under the action of higher pressure; (3) the temperature is not suitable to be high during preparation, bubbles are not required to be formed easily when the material is poured into a cavity of the clamp, and the shrinkage after being pressed is small; (4) under normal working conditions, the paint does not cause chemical changes, does not corrode metal, and can maintain the physical properties for a long time.
However, the existing liquid plastic has insufficient pressure resistance and too high shrinkage rate, cannot meet the pressure requirement of novel tire expansion, and is easy to cause leakage of the liquid plastic from gaps.
Disclosure of Invention
In order to solve the technical defects of insufficient pressure resistance and excessive shrinkage rate of the liquid plastic, the invention provides the precision tire expansion liquid plastic and the preparation and pouring method thereof, so that the liquid plastic is subjected to 500-inch sand 800KG/cm2The pressure of the rubber can not leak out from a gap of 0.01mm, and the shrinkage rate is less than or equal to 5 percent.
In order to achieve the purpose, the technical scheme is as follows:
the precision expanding liquid plastic comprises the following raw materials in percentage by weight: 18-22% of resin, 67-71% of plasticizer, 0.9-1.1% of calcium stearate and 8-12% of vacuum oil.
Preferably, the resin is a polyvinyl chloride resin, a polyethylene resin, or a polypropylene resin.
Preferably, the resin is a polyvinyl chloride resin.
Preferably, the resin is a powder and has a particle size of not more than 80 μm.
Preferably, the plasticizer is one or more of dibutyl phthalate, dioctyl phthalate, diethylhexyl phthalate and dibutoxyethyl phthalate.
Preferably, the ratio of dibutyl phthalate: the mass ratio of the dioctyl phthalate is 40-50: 50-60.
Preferably, the ratio of dibutyl phthalate: the mass ratio of the dioctyl phthalate is 50: 50.
The preparation and pouring method of the precision tire inflation liquid plastic comprises the following steps:
(1) weighing raw materials in proportion, and then mixing the resin with calcium stearate to obtain a mixture 1; respectively mixing the vacuum oil and the plasticizer to obtain a mixture 2; then uniformly mixing the mixture 1 and the mixture 2, and storing for 24 hours at the temperature of 20-30 ℃ to obtain a mixture 3;
(2) heating the mixture 3 in a heater to 185 ℃, stirring while heating, and stopping heating when no resin particles exist in the solution to obtain a mixture 4;
(3) placing the mixture 4 in a heater, keeping the temperature within the range of 175-185 ℃, stirring, removing thick slag floating on the liquid surface in a foam shape, and keeping for 30-60min to obtain a mixture 5;
(4) heating the precision expansion tire to 140-180 ℃, and pouring the mixture 5 which is not cooled and solidified to the inner cavity of the precision expansion tire.
Preferably, the precision tire expander in the step (4) is heated to 145 ℃.
Preferably, the temperature for pouring the mixture 5 in the step (4) is 145-150 ℃.
Has the advantages that: the liquid plastic is in a semitransparent soft rubber shape at room temperature, the liquid plastic after being poured has very few bubbles, the diameters of the bubbles are smaller than 1mm, the shrinkage rate of the liquid plastic after being poured into the clamp is smaller than 5%, and the pressure of the product is 500-2The liquid plastic does not leak out from the 0.01 gap in the range, and meanwhile, the liquid plastic has certain fluidity, can freely move in the inner cavity of the auxiliary clamp under the action of tiny pressure and uniformly transmit the pressure to all parts; the elastic material has certain elasticity, and can easily recover to the original position after pressure is removed; under the conditions of normal use and storage, the chemical and physical properties of the liquid plastic are kept unchanged, and metal is not corroded; the molten liquid is not easy to generate bubbles when being poured into the auxiliary clamp at the temperature of 145-150 ℃.
Drawings
FIG. 1: the liquid plastic obtained by the invention is in a state at normal temperature.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Example 1
The precision expanding liquid plastic comprises the following raw materials in percentage by weight: 19.9% of resin, 71% of plasticizer, 1.1% of calcium stearate and 8% of vacuum oil, wherein the resin is polyvinyl chloride resin powder, the particle size of the resin powder is not more than 80 mu m,
the plasticizer is dibutyl phthalate.
The preparation and pouring method of the precision tire inflation liquid plastic comprises the following steps:
(1) weighing raw materials in proportion, and then mixing the resin with calcium stearate to obtain a mixture 1; respectively mixing the vacuum oil and the plasticizer to obtain a mixture 2; then uniformly mixing the mixture 1 and the mixture 2, and storing at 20 ℃ for 24 hours to obtain a mixture 3;
(2) heating the mixture 3 in a heater to 170 ℃, stirring while heating, and stopping heating when no resin particles exist in the solution to obtain a mixture 4;
(3) placing the mixture 4 in a heater, keeping the temperature at 175 ℃, stirring, removing thick foam slag floating on the liquid surface, and keeping for 30min to obtain a mixture 5;
(4) and heating the precision expansion tire to 140 ℃, and pouring the mixture 5 which is not cooled and solidified to the inner cavity of the precision expansion tire.
The liquid plastic in this embodiment is in a semitransparent soft rubber shape at room temperature, the liquid plastic after being poured has very few bubbles, the diameters of the bubbles are all less than 1mm, and the liquid plastic after being poured into the fixture has a shrinkage rate of 5%, and is subjected to 500KG/cm2The pressure of the liquid plastic is not leaked from a gap of 0.01mm, the liquid plastic has certain fluidity, can freely move in the inner cavity of the auxiliary clamp and uniformly transmit the pressure to all places under the action of tiny pressure, has certain elasticity, is easy to recover to the original position after the pressure is removed, and has the advantages that the chemical and physical properties of the liquid plastic are kept unchanged and metal is not corroded under the conditions of common use and storage.
Example 2
The precision expanding liquid plastic comprises the following raw materials in percentage by weight: 22% of resin, 67% of plasticizer, 0.9% of calcium stearate and 10.1% of vacuum oil, wherein the resin is polyethylene resin powder, the particle size of the resin powder is not more than 80 mu m, the plasticizer is a mixture of dibutyl phthalate and dioctyl phthalate, and the mass ratio of the dibutyl phthalate to the dioctyl phthalate is 50: 50.
The preparation and pouring method of the precision tire inflation liquid plastic comprises the following steps:
(1) weighing raw materials in proportion, and then mixing the resin with calcium stearate to obtain a mixture 1; respectively mixing the vacuum oil and the plasticizer to obtain a mixture 2; then uniformly mixing the mixture 1 and the mixture 2, and storing for 24 hours at 25 ℃ to obtain a mixture 3;
(2) heating the mixture 3 in a heater to 185 ℃, stirring while heating, and stopping heating when no resin particles exist in the solution to obtain a mixture 4;
(3) placing the mixture 4 in a heater, keeping the temperature at 185 ℃, stirring, removing thick foam slag floating on the liquid surface, and keeping for 60min to obtain a mixture 5;
(4) heating the precision expansion tire to 145 ℃, pouring the mixture 5 which is not cooled and solidified into the inner cavity of the precision expansion tire, wherein the pouring temperature of the mixture 5 is 145 ℃.
The liquid plastic in this embodiment is in a semitransparent soft rubber shape at room temperature, the liquid plastic after being poured has very few bubbles, the diameters of the bubbles are all less than 1mm, and the liquid plastic after being poured into the fixture has a shrinkage rate of 4%, and when the liquid plastic is subjected to 800KG/cm2The pressure of the liquid plastic is not leaked from a gap of 0.01mm, the liquid plastic has certain fluidity, can freely move in the inner cavity of the auxiliary clamp and uniformly transmit the pressure to all places under the action of tiny pressure, has certain elasticity, is easy to recover to the original position after the pressure is removed, and has the advantages that the chemical and physical properties of the liquid plastic are kept unchanged and metal is not corroded under the conditions of common use and storage.
Example 3
The precision expanding liquid plastic comprises the following raw materials in percentage by weight: 18% of resin, 69% of plasticizer, 1.0% of calcium stearate and 12% of vacuum oil. The resin is polypropylene resin powder, the particle size of the resin powder is not more than 80 mu m, the plasticizer is a mixture of diethylhexyl phthalate and dibutoxyethyl phthalate, and the weight ratio of diethylhexyl phthalate: the mass ratio of dibutoxyethyl phthalate was 50: 50.
The preparation and pouring method of the precision tire inflation liquid plastic comprises the following steps:
(1) weighing raw materials in proportion, and then mixing the resin with calcium stearate to obtain a mixture 1; respectively mixing the vacuum oil and the plasticizer to obtain a mixture 2; then uniformly mixing the mixture 1 and the mixture 2, and storing at 30 ℃ for 24 hours to obtain a mixture 3;
(2) heating the mixture 3 in a heater to 180 ℃, stirring while heating, and stopping heating when no resin particles exist in the solution to obtain a mixture 4;
(3) placing the mixture 4 in a heater, keeping the temperature within 180 ℃, stirring, removing thick foam slag floating on the liquid surface, and keeping for 40min to obtain a mixture 5;
(4) and heating the precision expansion tire to 180 ℃, and pouring the mixture 5 which is not cooled and solidified to the inner cavity of the precision expansion tire.
The liquid plastic in the embodiment is in a semitransparent soft rubber shape at room temperature, the liquid plastic after being poured has very few bubbles, the shrinkage rate of the liquid plastic after being poured into a clamp is 5%, and the liquid plastic is subjected to 600KG/cm2The pressure of the liquid plastic is not leaked from a gap of 0.01mm, the liquid plastic has certain fluidity, can freely move in the inner cavity of the auxiliary clamp and uniformly transmit the pressure to all places under the action of tiny pressure, has certain elasticity, is easy to recover to the original position after the pressure is removed, and has the advantages that the chemical and physical properties of the liquid plastic are kept unchanged and metal is not corroded under the conditions of common use and storage.
Comparative example 1
A liquid plastic comprises the following raw materials in percentage by weight: 9% of polyethylene resin powder, 64% of dibutyl phthalate, 2% of calcium stearate and 25% of vacuum oil.
The preparation and casting method of the liquid plastic comprises the following steps:
(1) weighing raw materials according to a proportion, then uniformly mixing polyethylene resin powder, dibutyl phthalate, calcium stearate and vacuum oil, and storing at 25 ℃ for 24 hours to obtain a mixture 3;
(2) heating the mixture 3 in a heater to 185 ℃, stirring while heating, and stopping heating when no resin particles exist in the solution to obtain a mixture 4;
(3) placing the mixture 4 in a heater, keeping the temperature at 185 ℃, stirring, removing thick foam slag floating on the liquid surface, and keeping for 60min to obtain a mixture 5;
(4) heating the precision expanded tire to 130 ℃, pouring the mixture 5 which is not cooled and solidified into the inner cavity of the precision expanded tire, wherein the pouring temperature of the mixture 4 is 130 ℃.
In the liquid plastic of this embodiment, the liquid plastic after casting has many large bubbles, the maximum bubble diameter reaches 5-6mm, and the shrinkage rate of the liquid plastic after casting into the fixture is 12%, after 500KG/cm2The pressure of the air bag can leak out from a gap of 0.01mm, and the pressure-resistant requirement of mechanical tire expansion cannot be met.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (4)
1. The precision liquid expanding plastic is characterized by comprising the following raw materials in percentage by weight: 22% of resin, 67% of plasticizer, 0.9% of calcium stearate and 10.1% of vacuum oil, wherein the resin is polyethylene resin powder, the particle size of the resin powder is not more than 80 mu m, the plasticizer is a mixture of dibutyl phthalate and dioctyl phthalate, the mass ratio of the dibutyl phthalate to the dioctyl phthalate is 50:50,
the preparation method of the liquid plastic comprises the following steps:
(1) mixing the resin with calcium stearate to obtain a mixture 1; respectively mixing the vacuum oil and the plasticizer to obtain a mixture 2; then uniformly mixing the mixture 1 and the mixture 2, and storing for 24 hours at the temperature of 20-30 ℃ to obtain a mixture 3;
(2) heating the mixture 3 in a heater to 185 ℃, stirring while heating, and stopping heating when no resin particles exist in the solution to obtain a mixture 4;
(3) placing the mixture 4 in a heater, keeping the temperature in the range of 175-185 ℃, stirring, removing thick slag floating on the liquid surface in a foam shape, and keeping for 30-60min to obtain a mixture 5.
2. The casting method of the precision liquid expanding plastic of claim 1, which is characterized by comprising the following steps:
(1) mixing the resin with calcium stearate to obtain a mixture 1; respectively mixing the vacuum oil and the plasticizer to obtain a mixture 2; then uniformly mixing the mixture 1 and the mixture 2, and storing for 24 hours at the temperature of 20-30 ℃ to obtain a mixture 3;
(2) heating the mixture 3 in a heater to 185 ℃, stirring while heating, and stopping heating when no resin particles exist in the solution to obtain a mixture 4;
(3) placing the mixture 4 in a heater, keeping the temperature within the range of 175-185 ℃, stirring, removing thick foam slag floating on the liquid surface, and keeping for 30-60min to obtain a mixture 5;
(4) heating the precision expansion tire to 140-180 ℃, and pouring the mixture 5 which is not cooled and solidified to the inner cavity of the precision expansion tire.
3. The casting method of precision liquid expander plastic as claimed in claim 2, wherein the precision expander of step (4) is heated to 145 ℃.
4. The casting method of precision liquid expandable plastic as claimed in claim 2, wherein the temperature of the mixture 5 in step (4) is 145-150 ℃.
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| CN201811573367.7A CN109776997B (en) | 2018-12-21 | 2018-12-21 | Precision tire expanding liquid plastic and preparation and casting method thereof |
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| CN201811573367.7A CN109776997B (en) | 2018-12-21 | 2018-12-21 | Precision tire expanding liquid plastic and preparation and casting method thereof |
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| CN109776997B true CN109776997B (en) | 2021-06-22 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104511990A (en) * | 2013-09-29 | 2015-04-15 | 黄彬 | Liquid plastic casting method in liquid plastic centering fixture |
| CN104513438A (en) * | 2013-09-29 | 2015-04-15 | 黄彬 | Liquid plastic for centering fixture |
| CN104672649A (en) * | 2013-11-26 | 2015-06-03 | 徐小玲 | A liquid plastic formula |
| CN207013823U (en) * | 2017-03-20 | 2018-02-16 | 靖江市长源液压机械有限公司 | A kind of swollen tire of car oil cylinder screw thread |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140162045A1 (en) * | 2012-12-11 | 2014-06-12 | Baxter Healthcare Sa | Radiation stabilized pvc compositions, and method of making same |
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- 2018-12-21 CN CN201811573367.7A patent/CN109776997B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104511990A (en) * | 2013-09-29 | 2015-04-15 | 黄彬 | Liquid plastic casting method in liquid plastic centering fixture |
| CN104513438A (en) * | 2013-09-29 | 2015-04-15 | 黄彬 | Liquid plastic for centering fixture |
| CN104672649A (en) * | 2013-11-26 | 2015-06-03 | 徐小玲 | A liquid plastic formula |
| CN207013823U (en) * | 2017-03-20 | 2018-02-16 | 靖江市长源液压机械有限公司 | A kind of swollen tire of car oil cylinder screw thread |
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