CN109374426A - A kind of test method of the phenolic resin high temperature resistance for overlay film sandbinder - Google Patents
A kind of test method of the phenolic resin high temperature resistance for overlay film sandbinder Download PDFInfo
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- CN109374426A CN109374426A CN201811165562.6A CN201811165562A CN109374426A CN 109374426 A CN109374426 A CN 109374426A CN 201811165562 A CN201811165562 A CN 201811165562A CN 109374426 A CN109374426 A CN 109374426A
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- phenolic resin
- high temperature
- reference block
- sandbinder
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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Abstract
The present invention provides a kind of test method of the high temperature resistance of phenolic resin for overlay film sandbinder, the method is using sand grains, phenolic resin and curing agent as raw material, reference block is prepared, then by the reference block mode that constant pressure loads at a constant temperature or by the way of carrying out persistent pressure at a constant temperature, time required for testing standard test block is crushed or pressure, time resistant to high temperature and the pressure of phenolic resin are judged by time and pressure, to select unused phenolic resin according to different mould materials.Test method provided by the invention provides a kind of high temperature resistance in the binder more than the test phenolic resin under phenolic resin decomposition temperature as casting precoated sand, realize high temperature resistance of the qualitative detection phenolic resin as overlay film sandbinder, it is easy to operate, it is practical, be conducive to accurately select suitable phenolic resin type, casting difficulty is reduced, the performance of casting is improved.
Description
Technical field
The invention belongs to casting fields, and in particular to a kind of phenolic resin high temperature resistance for overlay film sandbinder
Test method.
Background technique
Casting is the binder of precoated sand with phenolic resin, and precoated sand is mainly used in the sand core mould of metal casting production
Type.In actual production, the pouring temperature of ironcasting reaches 1350-1450 DEG C, and steel-casting is due to its fusing point height, pouring temperature
1500-1700 DEG C is even more reached, therefore the heat resistance of phenolic resin and the service performance of precoated sand are closely bound up, has directly determined
Sand core resists the ability of impact be poured high-temperature liquid metal under conditions of.If heat-resistant time is inadequate, sand core is be easy to cause to mention
Preceding defeated and dispersed deformation causes casting the defects of scab, overlap, vein, deformation occur, for cylinder body water jacket thin-walled sand core, turbine case
Sand core, precise steel casting etc. are particularly important.But decomposed since carbonization occurs at 500 DEG C for phenolic resin, itself can not be formed,
Heat-resisting quantity is not directly carried out to it can be carried out detection, therefore currently without actual detection technique to all kinds of castings on the market
The verifying of high temperature resistance is carried out with fire resistant resin.Domestic detection phenolic resin is mainly at present: the softening point of resin, polymerization
Speed, mobility etc., resin producer there is no the analysis for carrying out system to resin property under the high temperature conditions, and these are often
Rule performance can only embody influence of the resin to precoated sand production process, such as resin in the covering property of sand grain surface, cannot be anti-
Reflect the casting phenolic resin performance quality in high temperature metal liquid environment.
Summary of the invention
For the technical problem more than solving, the present invention provides a kind of phenol that is simple, being effectively used for overlay film sandbinder
The detection method of the high temperature resistance of urea formaldehyde.
The object of the present invention is to provide a kind of test sides of the high temperature resistance of phenolic resin for overlay film sandbinder
Method.
The high temperature resistance for the phenolic resin for overlay film sandbinder that specific embodiment according to the present invention provides
Test method, comprising the following steps:
(1) make reference block: the reference block is by including that following raw material is made: sand grains, phenolic resin and curing agent；
(2) reference block is placed in 1000-1500 DEG C of test environment, constant temperature and pressure load is carried out to reference block
Or the load of constant temperature transformation, the pressure of the constant temperature transformation load are pressurizeed since 0MPa with constant rate；
(3) it observes and records: when constant temperature and pressure loads, the time required for record standard test block is crushed；The load of constant temperature transformation
When, the pressure that needs when record standard test block is crushed；
(4) the high temperature strength performance of phenolic resin is judged according to the time of step (3) or pressure.
Provided by the present invention for the high temperature resistance of the phenolic resin of overlay film sandbinder test method with sand grains, phenol
Urea formaldehyde and curing agent are raw material, and reference block is prepared, then reference block is loaded at a constant temperature constant pressure mode or
Person is by the way of carrying out persistent pressure at a constant temperature, time required for testing standard test block is crushed or pressure, when passing through
Between and pressure judge time resistant to high temperature and the pressure of phenolic resin, to select unused phenolic aldehyde according to mould material is not had to
Resin.Method provided by the invention can high temperature resistance of the qualitative analysis phenolic resin as overlay film sandbinder, operation letter
It is single, convenient for promoting the use of, be conducive to accurately select suitable phenolic resin type, reduce casting difficulty, improve the performance of casting.
Preferably, in step (1), the reference block includes that the raw material of following parts by weight is made: 85.5 parts of sand grains, phenolic aldehyde
1.7 parts and 12.8 parts of curing agent of resin.In casting process, during preparing molding sand, need using overlay film sandbinder and
Curing agent, the present invention improve the universal applicability of test by suitably proportion preparation reference block.
Preferably, in step (1), the sand grains is interior frosting.It is further preferred that the partial size of the interior frosting is 50-
100 mesh.
Interior frosting is common precoated sand, has good dihedral coefficient, clean surface, epigranular, gas permeability, mobility excellent
Good feature, therefore the present invention selects interior frosting, preferable particle size is that frosting prepares reference block in 50-100 purpose, improves test
General applicability.
Preferably, in step (1), the curing agent is vinyl triamine, diaminocyclohexane, di-2-ethylhexylphosphine oxide hexamethylene alkanamine
One of with diethylenetriamine.
Preferably, in step (1), the production method of the reference block includes: to weigh sand grains, phenolic resin and solidification
Agent is uniformly mixed, and is added in mold, and 110-120s is kept the temperature in 230-240 DEG C, is taken out sample, is obtained the reference block.
The high temperature resistance of phenolic resin can be fully demonstrated in order to obtain, and the present invention is when preparing reference block by sand
Grain, phenolic resin are mixed with curing agent, then in 230-240 DEG C of heat preservation 110-120s, so that phenolic resin gives full play to bonding
The effect of agent obtains the reference block with some strength, during the test, can embody the heat resistance of phenolic resin,
It avoids because other factors influence the accuracy of test.
Preferably, reference block described in step (1) is cylinder, and the diameter of the cylinder is Φ 10- Φ 50mm, high
Degree is 20-100mm, and the diameter of the cylindrical body and the ratio of height are 1:2.
Preferably, in step (2), the mode of the constant temperature and pressure load or the load of constant temperature transformation is Vertical loading.
Preferably, in step (2), the temperature of the constant temperature and pressure load is 1000 DEG C, pressure 0.2MPa.
Preferably, in step (2), the compression rate of the constant temperature transformation load is 0.01-0.03MPa/min.Due to
In casting process, high temperature liquid iron can wash away type chamber, give sand core pressure, and in the different times of casting, the pressure that sand core is born is not
Together, for the intensity of sand core, transformation load is carried out to reference block, the pressure of load is continuously improved, until conquassation, the present invention with
The constant compression rate of 0.01-0.03MPa/min is pressurizeed, and is given standard sample with pressure, can be guaranteed that sample is born not
Break increased pressure, the intensity of test sample characterizes the heat resistance of phenolic resin, avoids on-load pressure too fast and be crushed, shadow
Ring the accuracy of test.
Standard sample of the invention 1.7 parts and 12.8 parts of curing agent of phenolic resin, is prepared into cylindrical body with 85.5 parts of sand grains
Shape, diameter are Φ 10- Φ 50mm, are highly 20-100mm, when the diameter of cylindrical body and the ratio of height are 1:2, constant temperature and pressure
Loading method judgment criteria are as follows: within 60s be suitable for cast aluminium；60-120s is suitable for cast iron；It is suitable for cast steel higher than 160s
Part；The judgment criteria of the loading method of constant temperature transformation are as follows: judgment criteria are as follows: be suitable for cast aluminium within 0.1-0.3MP；0.3-
0.5MP is suitable for cast iron；0.5-0.6MPa is suitable for steel-casting.
The invention has the benefit that
Provided by the present invention for the high temperature resistance of the phenolic resin of overlay film sandbinder test method with sand grains, phenol
Urea formaldehyde and curing agent are raw material, and reference block is prepared, then by reference block at a constant temperature the mode of constant pressure load or
Person is by the way of carrying out persistent pressure at a constant temperature, time required for testing standard test block is crushed or pressure, when passing through
Between and pressure judge time resistant to high temperature and the pressure of phenolic resin, to select unused phenolic aldehyde according to different mould materials
Resin.Test method provided by the invention provides a kind of test phenolic resin conduct in the case where being more than phenolic resin decomposition temperature
The high temperature resistance of the binder of casting precoated sand, realizes resistance to height of the qualitative detection phenolic resin as overlay film sandbinder
Warm nature energy, it is easy to operate, it is practical, be conducive to accurately select suitable phenolic resin type, reduce casting difficulty, improve casting
The performance of part.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the schematic diagram of test method provided by the invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical solution of the present invention will be carried out below
Detailed description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all without making creative work
Other embodiment belongs to the range that the present invention is protected.
Embodiment 1
The test method of phenolic resin high temperature resistance for overlay film sandbinder, which is characterized in that including following step
It is rapid:
(1) make reference block: the reference block is by including that the raw material of following parts by weight is made: 85.5 parts of sand grains, phenol
1.7 parts and 12.8 parts of curing agent of urea formaldehyde；The production method of the reference block includes: to weigh sand grains, phenolic resin and solidification
Agent is uniformly mixed, and is added in mold, and 110-120s is kept the temperature in 230-240 DEG C, is taken out sample, is obtained the reference block, institute
It is Φ 10mm that state reference block, which be diameter, is highly the cylindrical body of 20mm；
(2) reference block is placed in 1000 DEG C of test environment, vertical constant temperature and pressure load is carried out to reference block,
The temperature of the constant temperature and pressure load is 1000 DEG C, pressure 0.2MPa；
(3) it observes and records: the time required for record standard test block is crushed；
(4) the high temperature strength performance of phenolic resin is judged according to the time of step (3).
Judgment criteria are as follows: be suitable for cast aluminium within 60s；60-120s is suitable for cast iron；It is suitable for steel-casting higher than 160s.
Embodiment 2
The test method of phenolic resin high temperature resistance for overlay film sandbinder, which is characterized in that including following step
It is rapid:
(1) make reference block: the reference block is made of the raw material including following parts by weight: 85.5 parts of interior frosting,
1.7 parts and 12.8 parts of curing agent of phenolic resin, the partial size of the interior frosting is 50-100 mesh, and the curing agent is vinyl three
Amine；The production method of the reference block includes: to weigh sand grains, phenolic resin and curing agent, is uniformly mixed, and is added in mold,
110-120s is kept the temperature in 230-240 DEG C, is taken out sample, is obtained the reference block, the reference block is that diameter is Φ
50mm is highly the cylindrical body of 100mm；
(2) reference block is placed in 1500 DEG C of test environment, vertical constant temperature and pressure load is carried out to reference block,
The temperature of the constant temperature and pressure load is 1000 DEG C, pressure 0.2MPa；
(3) it observes and records: the time required for record standard test block is crushed；
(4) the high temperature strength performance of phenolic resin is judged according to the time of step (3).
Judgment criteria are as follows: be suitable for cast aluminium within 60s；60-120s is suitable for cast iron；It is suitable for steel-casting higher than 160s.
Embodiment 3
The test method of phenolic resin high temperature resistance for overlay film sandbinder, which is characterized in that including following step
It is rapid:
(1) make reference block: the reference block is made of the raw material including following parts by weight: 85.5 parts of interior frosting,
1.7 parts and 12.8 parts of curing agent of phenolic resin, the partial size of the interior frosting is 50-100 mesh, and the curing agent is divinyl three
Amine；The production method of the reference block includes: to weigh sand grains, phenolic resin and curing agent, is uniformly mixed, and is added in mold,
110-120s is kept the temperature in 230-240 DEG C, is taken out sample, is obtained the reference block, the reference block is that diameter is Φ
20mm is highly the cylindrical body of 40mm；
(2) reference block is placed in 1500 DEG C of test environment, vertical constant temperature and pressure load is carried out to reference block,
The temperature of the constant temperature and pressure load is 1000 DEG C, pressure 0.2MPa；
(3) it observes and records: the time required for record standard test block is crushed；
(4) the high temperature strength performance of phenolic resin is judged according to the time of step (3).
Standard sample manufactured in the present embodiment is 5, is tested by 5 times, records the time required for being crushed every time, seeks
Average value, specific experimental data are shown in Table 1.
The testing result of 1 high temperature resistant time of table
Judgment criteria are as follows: be suitable for cast aluminium within 60s；60-120s is suitable for cast iron；It is suitable for steel-casting higher than 160s.
The result of table 1 illustrates that the heat resistance for the phenolic resin that the present embodiment uses is good, suitable for preparing steel-casting
Precoated sand.
Embodiment 4
The test method of phenolic resin high temperature resistance for overlay film sandbinder, which is characterized in that including following step
It is rapid:
(1) make reference block: the reference block is made of the raw material including following parts by weight: 85.5 parts of interior frosting,
1.7 parts and 12.8 parts of curing agent of phenolic resin, the partial size of the interior frosting is 50-100 mesh, and the curing agent is diamino hexamethylene
Alkane；The production method of the reference block includes: to weigh sand grains, phenolic resin and curing agent, is uniformly mixed, and is added in mold,
110-120s is kept the temperature in 230-240 DEG C, is taken out sample, is obtained the reference block, the reference block is that diameter is Φ
20mm is highly the cylindrical body of 40mm；
(2) reference block is placed in 1500 DEG C of test environment, vertical constant temperature transformation is carried out to reference block and is loaded,
The temperature of the constant temperature and pressure load is 1000 DEG C, and pressure is increased since 0MPa with the rate of 0.01MPa/min；
(3) it observes and records: pressure when record standard test block is crushed；
(4) the high temperature strength performance of phenolic resin is judged according to the pressure of step (3).
Judgment criteria are as follows: be suitable for cast aluminium within 0.1-0.3MP；0.3-0.5MP is suitable for cast iron；0.5-0.6MPa is applicable in
In steel-casting.
Embodiment 5
The test method of phenolic resin high temperature resistance for overlay film sandbinder, which is characterized in that including following step
It is rapid:
(1) make reference block: the reference block is made of the raw material including following parts by weight: 85.5 parts of interior frosting,
1.7 parts and 12.8 parts of curing agent of phenolic resin, the partial size of the interior frosting is 50-100 mesh, and the curing agent is that methylene is bicyclic
Hexane amine；The production method of the reference block includes: to weigh sand grains, phenolic resin and curing agent, is uniformly mixed, and mold is added
In, 110-120s is kept the temperature in 230-240 DEG C, is taken out sample, is obtained the reference block, the reference block is that diameter is Φ
20mm is highly the cylindrical body of 40mm；
(2) reference block is placed in 1500 DEG C of test environment, vertical constant temperature transformation is carried out to reference block and is loaded,
The temperature of the constant temperature and pressure load is 1000 DEG C, and pressure is increased since 0MPa with the rate of 0.03MPa/min；
(3) it observes and records: pressure when record standard test block is crushed；
(4) the high temperature strength performance of phenolic resin is judged according to the pressure of step (3).
Standard sample manufactured in the present embodiment is 5, is tested by 5 times, and pressure when conquassation every time is recorded, and is sought average
Value, specific experimental data are shown in Table 2.
The testing result of 2 high temperature resistant pressure of table
Judgment criteria are as follows: be suitable for cast aluminium within 0.1-0.3MP；0.3-0.5MP is suitable for cast iron；0.5-0.6MPa is applicable in
In steel-casting.
The result of table 2 illustrates that the heat resistance for the phenolic resin that the present embodiment uses is good, suitable for preparing steel-casting
Precoated sand.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of test method of the phenolic resin high temperature resistance for overlay film sandbinder, which is characterized in that including following
Step:
(1) make reference block: the reference block is by including that following raw material is made: sand grains, phenolic resin and curing agent；
(2) reference block is placed in 1000-1500 DEG C of test environment, constant temperature and pressure load or perseverance is carried out to reference block
The pressure of warm transformation load, the constant temperature transformation load is pressurizeed since 0MPa with constant rate；
(3) it observes and records: when constant temperature and pressure loads, the time required for record standard test block is crushed；When constant temperature transformation loads, note
The pressure needed when record reference block conquassation；
(4) the high temperature strength performance of phenolic resin is judged according to the time of step (3) or pressure.
2. the test method of the phenolic resin high temperature resistance according to claim 1 for overlay film sandbinder, special
Sign is, in step (1), the reference block includes that the raw material of following parts by weight is made: 85.5 parts of sand grains, phenolic resin 1.7
Part and 12.8 parts of curing agent.
3. the test method of the phenolic resin high temperature resistance according to claim 2 for overlay film sandbinder, special
Sign is, in step (1), the sand grains is interior frosting.
4. the test method of the phenolic resin high temperature resistance according to claim 3 for overlay film sandbinder, special
Sign is, in step (1), the partial size of the interior frosting is 50-100 mesh.
5. the test method of the phenolic resin high temperature resistance according to claim 1 for overlay film sandbinder, special
Sign is, in step (1), the curing agent is vinyl triamine, diaminocyclohexane, di-2-ethylhexylphosphine oxide hexamethylene alkanamine and divinyl
One of triamine.
6. the test side of -5 any phenolic resin high temperature resistances for overlay film sandbinder according to claim 1
Method, which is characterized in that in step (1), the production method of the reference block includes: to weigh sand grains, phenolic resin and curing agent,
It is uniformly mixed, is added in mold, 110-120s is kept the temperature in 230-240 DEG C, take out sample, obtain the reference block.
7. the test side of -5 any phenolic resin high temperature resistances for overlay film sandbinder according to claim 1
Method, which is characterized in that reference block described in step (1) is cylinder, and the diameter of the cylinder is Φ 10- Φ 50mm, high
Degree is 20-100mm, and the diameter of the cylindrical body and the ratio of height are 1:2.
8. the test side of -5 any phenolic resin high temperature resistances for overlay film sandbinder according to claim 1
Method, which is characterized in that in step (2), the mode of the constant temperature and pressure load or the load of constant temperature transformation is Vertical loading.
9. the test method of the phenolic resin high temperature resistance according to claim 8 for overlay film sandbinder, special
Sign is, in step (2), the temperature of the constant temperature and pressure load is 1000 DEG C, pressure 0.2MPa.
10. the test method of the phenolic resin high temperature resistance according to claim 8 for overlay film sandbinder, special
Sign is, in step (2), the compression rate of the constant temperature transformation load is 0.01-0.03MPa/min.
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| CN201811165562.6A CN109374426A (en) | 2018-09-30 | 2018-09-30 | A kind of test method of the phenolic resin high temperature resistance for overlay film sandbinder |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811165562.6A CN109374426A (en) | 2018-09-30 | 2018-09-30 | A kind of test method of the phenolic resin high temperature resistance for overlay film sandbinder |
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| CN116223311A (en) * | 2023-05-10 | 2023-06-06 | 四川大学 | Method and device for testing water-soluble collapsibility of water-soluble core mold material |
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Application publication date: 20190222 |