CN105414457A - Efficient modified alkaline phenolic resin self-hardening sand for thin-walled pump valve casting and preparation method of efficient modified alkaline phenolic resin self-hardening sand - Google Patents
Efficient modified alkaline phenolic resin self-hardening sand for thin-walled pump valve casting and preparation method of efficient modified alkaline phenolic resin self-hardening sand Download PDFInfo
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- CN105414457A CN105414457A CN201510814049.5A CN201510814049A CN105414457A CN 105414457 A CN105414457 A CN 105414457A CN 201510814049 A CN201510814049 A CN 201510814049A CN 105414457 A CN105414457 A CN 105414457A
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- sand
- phenolic resin
- thin
- pump valve
- alkaline phenolic
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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
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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
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses efficient modified alkaline phenolic resin self-hardening sand for a thin-walled pump valve casting. A modified phenolic resin adhesive used in the resin sand has advantages of low viscosity, high bonding strength, good plasticity, low brittleness, lower contents of free phenol and free formaldehyde, smaller using amount, low hardening speed and the like; using performance and reusing performance of moulding sand can be improved effectively; nano zirconium phosphate porous polypropylene fibers which are heavily mixed in sand materials are uniformly dispersed in sand molds to form continuous net-shaped structures, adhesion strength of the phenolic resin adhesive and the sand materials can be improved, plasticity of moulding sand is improved, meanwhile, the moulding sand has good breathability, thermal expansion stress generated by heating of the sand materials further can be reduced effectively, heat cracks of the surface of the casting are prevented, the quality of products is improved, and the efficient modified alkaline phenolic resin self-hardening sand is particularly suitable for thin-walled pump valve castings with complicated structures.
Description
Technical field
The present invention relates to resin sand technical field, particularly relate to a kind of thin-walled pump valve foundry goods high effective and modified alkaline phenolic resin self-hardening sand and preparation method thereof.
Background technology
Pump, valve foundry goods have the features such as wall is thin, complex-shaped, and particularly strict to the quality requirement of molding sand in casting process, the quality of molding sand is also the key factor being related to casting quality.Molding sand is mainly used for the material of moulding in casting according to the class that different ratios is mixed by sand material, bonding agent and adminicle etc., different according to the bonding agent used, clay-bonded sand, water-glass sand, resin sand etc. can be divided into, wherein phenol resin sand is widely used in domestic casting industry, wherein air-set mold phenol resin sand because its mulling is convenient, to prepare the advantage such as simple, rate of dispersion is fast, bonding force is strong more in sector application.
Although air-set mold phenol resin sand possesses the advantage of its uniqueness; but also there are some shortcomings of comparatively giving prominence in it; be mainly manifested in that viscosity is large, fragility is large, gas forming amount is high, foundry goods easily produces pin hole, cost is higher, the not easily aspect such as recycling; along with pump valve foundry goods is to the future development of production scale and high precision int, development efficient pollution-free, cost phenolic resin binder that is low, high comprehensive performance are the important prerequisites of casting high quality casting.
Summary of the invention
The object of the invention is exactly the defect in order to make up prior art, provides a kind of thin-walled pump valve foundry goods high effective and modified alkaline phenolic resin self-hardening sand and preparation method thereof.
The present invention is achieved by the following technical solutions:
The high effective and modified alkaline phenolic resin self-hardening sand of a kind of thin-walled pump valve foundry goods, this resin sand is prepared by the raw material of following weight portion: quartz sand 70-80, potassic feldspar sand 25-30, desulfurization gypsum powder 8-10, tungsten wire array 0.1-0.2, nanometer basic zirconium phosphate 0.2-0.3, graphite powder 2-3, polypropylene chip 0.4-0.5, calcium carbonate 0.01-0.02, silane coupler 0.01-0.02, phenol-formaldehyde resin modified bonding agent 1-1.5, curing agent 0.3-0.4.
Described phenol-formaldehyde resin modified bonding agent is made up of the raw material of following weight portion: potassium hydroxide solution 3-5, urea 1-2, silane coupler 0.1-0.2 that the formalin 20-35 that octyl epoxy stearate 0.2-0.3, organic silicon surfactant 0.1-0.2, nano aluminium oxide 1-2, Triafol T 2-3, phenol 20-25, concentration are 35-38%, concentration are 30%, its preparation method is: by phenol, formaldehyde adds in reactor, be heated to 60-80 DEG C, potassium hydroxide solution is added after being uniformly mixed 20-30min, be warming up to 80-100 DEG C of reaction 4-5h, add Triafol T subsequently, urea, organic silicon surfactant, continue to be uniformly mixed 1.5-2h, room temperature is cooled to after reaction terminates, subsequently reactant liquor is carried out decompression distillation dehydration with the ramp of 8-10 DEG C/min under 0.5-0.6 × 105Pa condition, decompression distillation is stopped when temperature reaches 105-110 DEG C, add other leftover materials subsequently, be cooled to room temperature after being uniformly mixed and get final product.
Described curing agent is organosilane ester curing agent.
Described a kind of thin-walled pump valve foundry goods preparation method of high effective and modified alkaline phenolic resin self-hardening sand is:
(1) first nanometer basic zirconium phosphate, calcium carbonate, polypropylene chip, silane coupler are uniformly mixed rear melt spinning, making length is 50-80 μm, and diameter is that the porous short fiber of 10-20 μm is for subsequent use;
(2) quartz sand, potassic feldspar sand, desulfurization gypsum powder, graphite powder were pulverized 60-100 mesh sieve after mixing, screened sand material drops in puddle mixer, add step (1) gained material and other leftover materials except curing agent and bonding agent subsequently again, curing agent is added after mixed at high speed is even, be uniformly mixed 4-5min, then add phenol-formaldehyde resin modified bonding agent, shake out after continuing to be uniformly mixed 8-10min and get final product.
The phenol-formaldehyde resin modified self-hardening sand that the present invention prepares possesses following advantage:
(1) the phenol-formaldehyde resin modified bonding agent prepared has low viscosity, high bonding strength, plasticity is good, fragility is low, free-phenol and the advantage such as free formaldehyde content is lower, consumption is less, setting rate slows down, and effectively can improve molding sand and uses and re-use performance.
(2) porous polypropylene fibre dispersed formation continuous print network structure in sand mold of blending nanometer basic zirconium phosphate, it can promote the bonding force of phenolic resin binder and sand material, improve the plasticity of molding sand, give molding sand good gas permeability simultaneously, it can also effectively reduce sand material by thermogenetic thermal expansion stress, prevent cast(ing) surface hot tearing, improve the quality of product, be particularly suitable for thin-walled, baroque pump valve foundry goods.
Detailed description of the invention
This embodiment resin sand is prepared by the raw material of following weight portion: quartz sand 70, potassic feldspar sand 25, desulfurization gypsum powder 8, tungsten wire array 0.1, nanometer basic zirconium phosphate 0.2, graphite powder 2, polypropylene chip 0.4, calcium carbonate 0.01, silane coupler 0.01, phenol-formaldehyde resin modified bonding agent 1, curing agent 0.3.
Wherein phenol-formaldehyde resin modified bonding agent is made up of the raw material of following weight portion: potassium hydroxide solution 3, urea 1, silane coupler 0.1 that the formalin 20 that octyl epoxy stearate 0.2, organic silicon surfactant 0.1, nano aluminium oxide 1, Triafol T 2, phenol 20, concentration are 35%, concentration are 30%; Its preparation method is: add in reactor by phenol, formaldehyde, be heated to 60 DEG C, potassium hydroxide solution is added after being uniformly mixed 20min, be warming up to 80 DEG C of reaction 4h, add Triafol T, urea, organic silicon surfactant subsequently, continue to be uniformly mixed 1.5h, room temperature is cooled to after reaction terminates, subsequently reactant liquor is carried out decompression distillation dehydration with the ramp of 8 DEG C/min under 0.5 × 105Pa condition, decompression distillation is stopped when temperature reaches 105 DEG C, add other leftover materials subsequently, be cooled to room temperature after being uniformly mixed and get final product.
The curing agent adopted is glycerol triacetate.
The preparation method of this resin sand is:
(1) first nanometer basic zirconium phosphate, calcium carbonate, polypropylene chip, silane coupler are uniformly mixed rear melt spinning, making length is 50 μm, and diameter is that the porous short fiber of 10 μm is for subsequent use;
(2) quartz sand, potassic feldspar sand, desulfurization gypsum powder, graphite powder were pulverized 60 mesh sieves after mixing, screened sand material drops in puddle mixer, add step (1) gained material and other leftover materials except curing agent and bonding agent subsequently again, curing agent is added after mixed at high speed is even, be uniformly mixed 4min, then add phenol-formaldehyde resin modified bonding agent, shake out after continuing to be uniformly mixed 8min and get final product.
The bonding strength of the phenol-formaldehyde resin modified bonding agent obtained by the present embodiment is 6.50MPa, free phenol content≤0.5%, content of free aldehyde≤0.1%, maximum decomposition temperature can reach 540 DEG C, this resin sand stripping time >=15min, 24h tensile strength is 1.40MPa, and core hydroscopicity is low, and gas forming amount reduces by 35% than traditional phenolic resins molding sand, the surface quality of continuous castings obtained is high, size is accurate, and yield rate can reach more than 98%, and reclamation of return sand rate can reach 85%.
Claims (4)
1. the high effective and modified alkaline phenolic resin self-hardening sand of thin-walled pump valve foundry goods, it is characterized in that, this resin sand is prepared by the raw material of following weight portion: quartz sand 70-80, potassic feldspar sand 25-30, desulfurization gypsum powder 8-10, tungsten wire array 0.1-0.2, nanometer basic zirconium phosphate 0.2-0.3, graphite powder 2-3, polypropylene chip 0.4-0.5, calcium carbonate 0.01-0.02, silane coupler 0.01-0.02, phenol-formaldehyde resin modified bonding agent 1-1.5, curing agent 0.3-0.4.
2. the high effective and modified alkaline phenolic resin self-hardening sand of a kind of thin-walled pump valve foundry goods as claimed in claim 1, it is characterized in that, described phenol-formaldehyde resin modified bonding agent is made up of the raw material of following weight portion: potassium hydroxide solution 3-5, urea 1-2, silane coupler 0.1-0.2 that the formalin 20-35 that octyl epoxy stearate 0.2-0.3, organic silicon surfactant 0.1-0.2, nano aluminium oxide 1-2, Triafol T 2-3, phenol 20-25, concentration are 35-38%, concentration are 30%, its preparation method is: by phenol, formaldehyde adds in reactor, be heated to 60-80 DEG C, potassium hydroxide solution is added after being uniformly mixed 20-30min, be warming up to 80-100 DEG C of reaction 4-5h, add Triafol T subsequently, urea, organic silicon surfactant, continue to be uniformly mixed 1.5-2h, room temperature is cooled to after reaction terminates, subsequently reactant liquor is carried out decompression distillation dehydration with the ramp of 8-10 DEG C/min under 0.5-0.6 × 105Pa condition, decompression distillation is stopped when temperature reaches 105-110 DEG C, add other leftover materials subsequently, be cooled to room temperature after being uniformly mixed and get final product.
3. the high effective and modified alkaline phenolic resin self-hardening sand of a kind of thin-walled pump valve foundry goods as claimed in claim 1, is characterized in that, described curing agent is organosilane ester curing agent.
4. a kind of thin-walled pump valve foundry goods preparation method of high effective and modified alkaline phenolic resin self-hardening sand as claimed in claim 1, it is characterized in that, described preparation method is:
(1) first nanometer basic zirconium phosphate, calcium carbonate, polypropylene chip, silane coupler are uniformly mixed rear melt spinning, making length is 50-80 μm, and diameter is that the porous short fiber of 10-20 μm is for subsequent use;
(2) quartz sand, potassic feldspar sand, desulfurization gypsum powder, graphite powder were pulverized 60-100 mesh sieve after mixing, screened sand material drops in puddle mixer, add step (1) gained material and other leftover materials except curing agent and bonding agent subsequently again, curing agent is added after mixed at high speed is even, be uniformly mixed 4-5min, then add phenol-formaldehyde resin modified bonding agent, shake out after continuing to be uniformly mixed 8-10min and get final product.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510814049.5A CN105414457A (en) | 2015-11-23 | 2015-11-23 | Efficient modified alkaline phenolic resin self-hardening sand for thin-walled pump valve casting and preparation method of efficient modified alkaline phenolic resin self-hardening sand |
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| CN201510814049.5A CN105414457A (en) | 2015-11-23 | 2015-11-23 | Efficient modified alkaline phenolic resin self-hardening sand for thin-walled pump valve casting and preparation method of efficient modified alkaline phenolic resin self-hardening sand |
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| CN105414457A true CN105414457A (en) | 2016-03-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107282859A (en) * | 2017-06-30 | 2017-10-24 | 安徽省辉煌机械制造有限公司 | A kind of swage molding sand for improving refractoriness |
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| GB792574A (en) * | 1955-06-06 | 1958-04-02 | Monsanto Chemicals | Phenolic resins and their use in moulding processes |
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| EP0336533A2 (en) * | 1988-04-08 | 1989-10-11 | Borden, Inc. | Process to enhance the tensile strength of reclaimed sand bonded with ester cured alkaline phenolic resin |
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| CN101804443A (en) * | 2010-04-21 | 2010-08-18 | 上海交通大学 | No-bake resin sand for sand casting of magnesium alloy and preparation method thereof |
| CN101875830A (en) * | 2009-11-23 | 2010-11-03 | 黑龙江省科学院石油化学研究院 | Phenolic resin/phosphate hybrid adhesive and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107282859A (en) * | 2017-06-30 | 2017-10-24 | 安徽省辉煌机械制造有限公司 | A kind of swage molding sand for improving refractoriness |
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