CN108421953A - A kind of precoated sand and preparation method thereof - Google Patents
A kind of precoated sand and preparation method thereof Download PDFInfo
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- CN108421953A CN108421953A CN201810199661.XA CN201810199661A CN108421953A CN 108421953 A CN108421953 A CN 108421953A CN 201810199661 A CN201810199661 A CN 201810199661A CN 108421953 A CN108421953 A CN 108421953A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/2246—Condensation polymers of aldehydes and ketones
- B22C1/2253—Condensation polymers of aldehydes and ketones with phenols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/28—Chemically modified polycondensates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/28—Chemically modified polycondensates
- C08G8/32—Chemically modified polycondensates by organic acids or derivatives thereof, e.g. fatty oils
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- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
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Abstract
The invention discloses a kind of precoated sands and preparation method thereof, are related to foundary industry technical field, and the precoated sand includes the raw material of following parts by weight：140 160 parts of roughing sand, 35 parts of modified heat resistant phenolic resin, 13 parts of methenamine, 0.2 0.5 parts of calcium stearate, 0.02 0.05 parts of silane coupling agent, 0.05 0.1 parts of iron oxide red, 25 parts of kaolin, 10 15 parts of water.The present invention is using roughing sand as base material, one layer of modified heat resistant phenolic resin is coated on its surface, finally also one layer of iron oxide red and kaolin are being covered on roughing sand surface, improve its intensity, the precoated sand of preparation has high intensity, heat safe performance, and preparation method is simple, and the yield rate of casting can be improved for cast steel.
Description
Technical field
The present invention relates to foundary industry technical fields, and in particular to a kind of precoated sand and preparation method thereof.
Background technology
Overlay film roughing sand refers to having the type roughing sand or core roughing sand of one layer of hard resin film in former sand grain surface before moulding.Have cold
Two kinds of coating techniques of method and Re Fa：Both cold process is dissolved resin with ethyl alcohol, and methenamine is added during mixed roughing sand, make
It is coated on former sand grain surface, ethyl alcohol volatilization must cover roughing sand film；Hot method is that roughing sand is preheating to certain temperature, and resin is added to keep it molten
Melt, stirring makes resin be coated on former sand grain surface, and methenamine aqueous solution and lubricant, cooling, broken, screening is added to obtain overlay film
Roughing sand, for steel-casting, ironcasting.Due to cover roughing sand film is high with intensity, gas forming amount is low, production casting dimension precision is high,
Any surface finish is convenient for the advantages that preservation, applies in recent years increasingly extensive.
The pouring temperature of cast steel precoated sand molten steel in process of production is higher, to wanting for the high temperature resistance of precoated sand raw material
Ask also very high, precoated sand heat-resisting quantity made from existing raw material and production technology cannot meet the needs of people, therefore, there is an urgent need for
Develop a kind of heat-resist precoated sand.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of heat-resist precoated sands and preparation method thereof.
In order to achieve the above object, the present invention is achieved by the following technical programs：
A kind of precoated sand comprising the raw material of following parts by weight：140-160 parts of roughing sand, modified heat resistant phenolic resin 3-5
Part, 1-3 parts of methenamine, 0.2-0.5 parts of calcium stearate, 0.02-0.05 parts of silane coupling agent, 0.05-0.1 parts of iron oxide red, kaolinite
2-5 parts native, 10-15 parts of water.
Preferably, include the raw material of following parts by weight：150 parts of roughing sand, 3.3 parts of modified heat resistant phenolic resin, methenamine
1.65 parts, 0.4 part of calcium stearate, 0.03 part of silane coupling agent, 0.07 part of iron oxide red, 3.4 parts of kaolin, 12 parts of water.
Preferably, the preparation process of the modified heat resistant phenolic resin is as follows：Phenol and ammonium hydroxide are added in reaction kettle,
Preheating, adds formaldehyde, stirs, and heating reaction vacuumizes dehydration, 4- hydroxymethyl phenyls boric acid and naphthalene first are then added thereto
Acid, back flow reaction, vacuum drying to get.
Preferably, the preparation process of the modified heat resistant phenolic resin is as follows：By 90-100 parts of phenol and 25% ammonium hydroxide 3-7
Part is added in reaction kettle, is preheated to 40-50 DEG C, adds 35-40 parts of formaldehyde, stirs, and is heated to 70-80 DEG C, reacts 1-2h,
Vacuumize dehydration, be then added thereto 3-7 parts of 4- hydroxymethyl phenyl boric acid and with 0.5-2 parts, back flow reaction 1-2h of naphthoic acid,
Vacuum drying to get.
Preferably, the stir speed (S.S.) is 600-800r/min.
Preferably, the vacuum drying temperature is 75-80 DEG C.
The preparation method of above-mentioned precoated sand, includes the following steps:
S1, roughing sand is preheated in heating furnace；
S2, the roughing sand after preheating is added in sand mixer, modified heat resistant phenolic resin is added, mix 20-30s；
It is S3, methenamine is soluble in water, methenamine aqueous solution is obtained, is then added in the sand mixer of S2,50- is mixed
60s；
S4, calcium stearate, silane coupling agent and iron oxide red are added in the sand mixer of S3, mix 30-40s, puts sand, obtain mixed
Close sand；
S5, mixed sand is crushed, screening, obtains precoated sand.
Preferably, it is preheated to 120-150 DEG C in the S1.
Advantageous effect：The present invention coats one layer of modified heat resistant phenolic resin using roughing sand as base material, on its surface, finally also exists
Roughing sand surface is covering one layer of iron oxide red and kaolin, improves its intensity, and the precoated sand of preparation has high intensity, heat safe property
Can, and preparation method is simple, and the yield rate of casting can be improved for cast steel.It is to use in prepared by modified heat resistant phenolic resin
3-7 parts of 4- hydroxymethyl phenyl boric acid and naphthoic acid are modified phenolic resin, the boron hydroxyl in 4- hydroxymethyl phenyl boric acid and
The phenolic hydroxyl group in carboxyl and phenolic resin in naphthoic acid reacts, and reduces the number of active group in phenolic resin, raw
It is introduced into phenolic resin at rock-steady structure, and by boron and rigid naphthalene nucleus, improves the bond properties of phenolic resin, improve its brittleness
Greatly, not water-fast disadvantage enhances its heat resistance.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention,
Technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is the present invention one
Divide embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making
The every other embodiment obtained under the premise of creative work, shall fall within the protection scope of the present invention.
Embodiment 1：
A kind of precoated sand comprising the raw material of following parts by weight：140 parts of roughing sand, 3 parts of modified heat resistant phenolic resin, Wu Luo
1 part of tropine, 0.2 part of calcium stearate, 0.02 part of silane coupling agent, 0.05 part of iron oxide red, 2 parts of kaolin, 10 parts of water；
Wherein, the preparation process of modified heat resistant phenolic resin is as follows：3 parts of 90 parts of phenol and 25% ammonium hydroxide are added to reaction
In kettle, 40 DEG C are preheated to, adds 35 parts of formaldehyde, is stirred with the rotating speed of 600r/min, is heated to 70 DEG C, 1h is reacted, vacuumizes
Dehydration, is then added 3 parts of 4- hydroxymethyl phenyls boric acid and with 0.5 part, back flow reaction 1h of naphthoic acid thereto, the vacuum at 75 DEG C
It is dry to get.
The preparation method of above-mentioned precoated sand, includes the following steps:
S1, roughing sand is preheated to 120 DEG C in heating furnace；
S2, the roughing sand after preheating is added in sand mixer, modified heat resistant phenolic resin is added, mix 20s；
It is S3, methenamine is soluble in water, methenamine aqueous solution is obtained, is then added in the sand mixer of S2, is mixed
50s；
S4, calcium stearate, silane coupling agent and iron oxide red are added in the sand mixer of S3, mix 30s, puts sand, must mix
Sand；
S5, mixed sand is crushed, screening, obtains precoated sand.
Embodiment 2：
A kind of precoated sand comprising the raw material of following parts by weight：150 parts of roughing sand, 3.3 parts of modified heat resistant phenolic resin, crow
1.65 parts of Lip river tropine, 0.4 part of calcium stearate, 0.03 part of silane coupling agent, 0.07 part of iron oxide red, 3.4 parts of kaolin, 12 parts of water；
Wherein, the preparation process of modified heat resistant phenolic resin is as follows：4 parts of 92 parts of phenol and 25% ammonium hydroxide are added to reaction
In kettle, 40 DEG C are preheated to, adds 36 parts of formaldehyde, is stirred with the rotating speed of 650r/min, is heated to 75 DEG C, reacts 1.5h, is taken out true
Sky dehydration, be then added thereto 4 parts of 4- hydroxymethyl phenyls boric acid and with 0.8 part, back flow reaction 1h of naphthoic acid, it is true at 75 DEG C
Sky it is dry to get.
The preparation method of above-mentioned overlay film roughing sand, includes the following steps:
S1, roughing sand is preheated to 130 DEG C in heating furnace；
S2, the roughing sand after preheating is added in sand mixer, modified heat resistant phenolic resin is added, mix 25s；
It is S3, methenamine is soluble in water, methenamine aqueous solution is obtained, is then added in the sand mixer of S2, is mixed
55s；
S4, calcium stearate, silane coupling agent and iron oxide red are added in the sand mixer of S3, mix 35s, puts sand, must mix
Sand；
S5, mixed sand is crushed, screening, obtains precoated sand.
Embodiment 3：
A kind of precoated sand comprising the raw material of following parts by weight：152 parts of roughing sand, 3.5 parts of modified heat resistant phenolic resin, crow
2 parts of Lip river tropine, 0.3 part of calcium stearate, 0.04 part of silane coupling agent, 0.08 part of iron oxide red, 3.7 parts of kaolin, 13 parts of water；
Wherein, the preparation process of modified heat resistant phenolic resin is as follows：5 parts of 95 parts of phenol and 25% ammonium hydroxide are added to reaction
In kettle, 45 DEG C are preheated to, adds 38 parts of formaldehyde, is stirred with the rotating speed of 700r/min, is heated to 75 DEG C, reacts 1.5h, is taken out true
Sky dehydration, be then added thereto 5 parts of 4- hydroxymethyl phenyls boric acid and with 1.4 parts, back flow reaction 1.5h of naphthoic acid, at 75 DEG C
Vacuum drying to get.
The preparation method of above-mentioned precoated sand, includes the following steps:
S1, roughing sand is preheated to 140 DEG C in heating furnace；
S2, the roughing sand after preheating is added in sand mixer, modified heat resistant phenolic resin is added, mix 20s；
It is S3, methenamine is soluble in water, methenamine aqueous solution is obtained, is then added in the sand mixer of S2, is mixed
50s；
S4, calcium stearate, silane coupling agent and iron oxide red are added in the sand mixer of S3, mix 40s, puts sand, must mix
Sand；
S5, mixed sand is crushed, screening, obtains precoated sand.
Embodiment 4：
A kind of precoated sand comprising the raw material of following parts by weight：155 parts of roughing sand, 4.2 parts of modified heat resistant phenolic resin, crow
2.3 parts of Lip river tropine, 0.4 part of calcium stearate, 0.04 part of silane coupling agent, 0.07 part of iron oxide red, 4.2 parts of kaolin, 14 parts of water；
Wherein, the preparation process of modified heat resistant phenolic resin is as follows：6 parts of 97 parts of phenol and 25% ammonium hydroxide are added to reaction
In kettle, 45 DEG C are preheated to, adds 37 parts of formaldehyde, is stirred with the rotating speed of 750r/min, is heated to 75 DEG C, 1h is reacted, vacuumizes
Dehydration, is then added 6 parts of 4- hydroxymethyl phenyls boric acid and with 1 part, back flow reaction 1.5h of naphthoic acid thereto, the vacuum at 80 DEG C
It is dry to get.
The preparation method of above-mentioned overlay film roughing sand, includes the following steps:
S1, roughing sand is preheated to 150 DEG C in heating furnace；
S2, the roughing sand after preheating is added in sand mixer, modified heat resistant phenolic resin is added, mix 25s；
It is S3, methenamine is soluble in water, methenamine aqueous solution is obtained, is then added in the sand mixer of S2, is mixed
50s；
S4, calcium stearate, silane coupling agent and iron oxide red are added in the sand mixer of S3, mix 35s, puts sand, must mix
Sand；
S5, mixed sand is crushed, screening, obtains precoated sand.
Embodiment 5：
A kind of precoated sand comprising the raw material of following parts by weight：157 parts of roughing sand, 4.5 parts of modified heat resistant phenolic resin, crow
2.5 parts of Lip river tropine, 0.5 part of calcium stearate, 0.04 part of silane coupling agent, 0.08 part of iron oxide red, 4.5 parts of kaolin, 13 parts of water；
Wherein, the preparation process of modified heat resistant phenolic resin is as follows：6.3 parts of 98 parts of phenol and 25% ammonium hydroxide are added to instead
It answers in kettle, is preheated to 45 DEG C, add 38 parts of formaldehyde, stirred with the rotating speed of 750r/min, be heated to 80 DEG C, react 1.5h, take out
Vacuum dehydration, be then added thereto 5.5 parts of 4- hydroxymethyl phenyls boric acid and with 1.5 parts, back flow reaction 1h of naphthoic acid, at 80 DEG C
Lower vacuum drying to get.
The preparation method of above-mentioned overlay film roughing sand, includes the following steps:
S1, roughing sand is preheated to 145 DEG C in heating furnace；
S2, the roughing sand after preheating is added in sand mixer, modified heat resistant phenolic resin is added, mix 30s；
It is S3, methenamine is soluble in water, methenamine aqueous solution is obtained, is then added in the sand mixer of S2, is mixed
50s；
S4, calcium stearate, silane coupling agent and iron oxide red are added in the sand mixer of S3, mix 40s, puts sand, must mix
Sand；
S5, mixed sand is crushed, screening, obtains precoated sand.
Embodiment 6：
A kind of overlay film roughing sand comprising the raw material of following parts by weight：160 parts of roughing sand, 5 parts of modified heat resistant phenolic resin, crow
3 parts of Lip river tropine, 0.5 part of calcium stearate, 0.05 part of silane coupling agent, 0.1 part of iron oxide red, 4.6 parts of kaolin, 15 parts of water.
Wherein, the preparation process of modified heat resistant phenolic resin is as follows：7 parts of 100 parts of phenol and 25% ammonium hydroxide are added to instead
It answers in kettle, is preheated to 50 DEG C, add 40 parts of formaldehyde, stirred with the rotating speed of 800r/min, be heated to 80 DEG C, react 2h, take out true
Sky dehydration, is then added 7 parts of 4- hydroxymethyl phenyls boric acid and with 2 parts, back flow reaction 2h of naphthoic acid thereto, the vacuum at 80 DEG C
It is dry to get.
The preparation method of above-mentioned overlay film roughing sand, includes the following steps:
S1, roughing sand is preheated to 150 DEG C in heating furnace；
S2, the roughing sand after preheating is added in sand mixer, modified heat resistant phenolic resin is added, mix 30s；
It is S3, methenamine is soluble in water, methenamine aqueous solution is obtained, is then added in the sand mixer of S2, is mixed
60s；
S4, calcium stearate, silane coupling agent and iron oxide red are added in the sand mixer of S3, mix 40s, puts sand, must mix
Sand；
S5, mixed sand is crushed, screening, obtains precoated sand.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each implementation
Technical solution recorded in example is modified or equivalent replacement of some of the technical features；And these modification or
It replaces, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (8)
1. a kind of precoated sand, which is characterized in that include the raw material of following parts by weight：140-160 parts of roughing sand, modified heat resistant phenolic aldehyde tree
3-5 parts of fat, 1-3 parts of methenamine, 0.2-0.5 parts of calcium stearate, 0.02-0.05 parts of silane coupling agent, 0.05-0.1 parts of iron oxide red,
2-5 parts of kaolin, 10-15 parts of water.
2. precoated sand according to claim 1, which is characterized in that include the raw material of following parts by weight：150 parts of roughing sand changes
3.3 parts of heat-resistant phenolic resins of property, 1.65 parts of methenamine, 0.4 part of calcium stearate, 0.03 part of silane coupling agent, 0.07 part of iron oxide red,
3.4 parts of kaolin, 12 parts of water.
3. precoated sand according to claim 1 or 2, which is characterized in that the preparation process of the modified heat resistant phenolic resin
It is as follows：Phenol and ammonium hydroxide are added in reaction kettle, preheats, adds formaldehyde, is stirred, heating reaction vacuumizes dehydration, then
Be added 4- hydroxymethyl phenyls boric acid and naphthoic acid thereto, back flow reaction, vacuum drying to get.
4. precoated sand according to claim 3, which is characterized in that the preparation process of the modified heat resistant phenolic resin is such as
Under：3-7 parts of 90-100 parts of phenol and 25% ammonium hydroxide are added in reaction kettle, 40-50 DEG C is preheated to, adds formaldehyde 35-40
Part, stirring is heated to 70-80 DEG C, reacts 1-2h, vacuumizes dehydration, and 3-7 parts of 4- hydroxymethyl phenyl boric acid is then added thereto
With with 0.5-2 parts, back flow reaction 1-2h of naphthoic acid, vacuum drying to get.
5. precoated sand according to claim 4, which is characterized in that the stir speed (S.S.) is 600-800r/min.
6. precoated sand according to claim 4, which is characterized in that the vacuum drying temperature is 75-80 DEG C.
7. the preparation method of the precoated sand according to claim 1-6, which is characterized in that include the following steps:
S1, roughing sand is preheated in heating furnace；
S2, the roughing sand after preheating is added in sand mixer, modified heat resistant phenolic resin is added, mix 20-30s；
It is S3, methenamine is soluble in water, methenamine aqueous solution is obtained, is then added in the sand mixer of S2,50-60s is mixed；
S4, calcium stearate, silane coupling agent and iron oxide red are added in the sand mixer of S3, mix 30-40s, puts sand, must mix
Sand；
S5, mixed sand is crushed, screening, obtains precoated sand.
8. the preparation method of precoated sand according to claim 7, which is characterized in that be preheated to 120-150 DEG C in the S1.
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| CN110102704A (en) * | 2019-05-28 | 2019-08-09 | 沙县宏盛塑料有限公司 | A kind of modification phenolic resin-based precoated sand and preparation method thereof |
| CN112743035A (en) * | 2020-12-29 | 2021-05-04 | 宿迁兄弟覆膜砂有限公司 | Special precoated sand for stainless steel and preparation process thereof |
| CN113333664A (en) * | 2021-05-17 | 2021-09-03 | 柳晶（溧阳）环保科技有限公司 | High-temperature-resistant precoated sand |
| CN115041628A (en) * | 2022-07-05 | 2022-09-13 | 柳州柳晶环保科技有限公司 | Method for preparing regenerated precoated sand by using waste precoated sand |
| CN117181990A (en) * | 2023-10-07 | 2023-12-08 | 胜利油田金岛实业有限责任公司 | High-temperature-resistant precoated sand and preparation method thereof |
| CN117487105A (en) * | 2024-01-02 | 2024-02-02 | 山东宇世巨化工有限公司 | Preparation method of phenolic resin for precoated sand |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110102704A (en) * | 2019-05-28 | 2019-08-09 | 沙县宏盛塑料有限公司 | A kind of modification phenolic resin-based precoated sand and preparation method thereof |
| CN110102704B (en) * | 2019-05-28 | 2020-12-18 | 沙县宏盛塑料有限公司 | Modified phenolic resin-based precoated sand and preparation method thereof |
| CN112743035A (en) * | 2020-12-29 | 2021-05-04 | 宿迁兄弟覆膜砂有限公司 | Special precoated sand for stainless steel and preparation process thereof |
| CN113333664A (en) * | 2021-05-17 | 2021-09-03 | 柳晶（溧阳）环保科技有限公司 | High-temperature-resistant precoated sand |
| CN115041628A (en) * | 2022-07-05 | 2022-09-13 | 柳州柳晶环保科技有限公司 | Method for preparing regenerated precoated sand by using waste precoated sand |
| CN117181990A (en) * | 2023-10-07 | 2023-12-08 | 胜利油田金岛实业有限责任公司 | High-temperature-resistant precoated sand and preparation method thereof |
| CN117181990B (en) * | 2023-10-07 | 2024-03-19 | 胜利油田金岛实业有限责任公司 | High-temperature-resistant precoated sand and preparation method thereof |
| CN117487105A (en) * | 2024-01-02 | 2024-02-02 | 山东宇世巨化工有限公司 | Preparation method of phenolic resin for precoated sand |
| CN117487105B (en) * | 2024-01-02 | 2024-03-26 | 山东宇世巨化工有限公司 | Preparation method of phenolic resin for precoated sand |
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