CN105414451A - High-compactness modified alkaline phenolic resin self-hardening sand for pump valve castings and preparation method of high-compactness modified alkaline phenolic resin self-hardening sand - Google Patents

High-compactness modified alkaline phenolic resin self-hardening sand for pump valve castings and preparation method of high-compactness modified alkaline phenolic resin self-hardening sand Download PDF

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Publication number
CN105414451A
CN105414451A CN201510813758.1A CN201510813758A CN105414451A CN 105414451 A CN105414451 A CN 105414451A CN 201510813758 A CN201510813758 A CN 201510813758A CN 105414451 A CN105414451 A CN 105414451A
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sand
pump valve
phenol
alkaline phenolic
uniformly mixed
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CN201510813758.1A
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Chinese (zh)
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李诺
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Hefei Linuo New Materials Trade Co Ltd
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Hefei Linuo New Materials Trade Co Ltd
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Abstract

The invention discloses high-compactness modified alkaline phenolic resin self-hardening sand for pump valve castings. An adopted modified phenolic resin adhesive in the resin sand has the advantages that the viscosity is low, the bonding strength is high, the plasticity is good, the brittleness is low, the contents of free phenol and free formaldehyde are lower, the use amount is lower, the hardening speed is decreased, and the like, so that the use and reuse performance of the molding sand can be effectively improved; through the addition of polylactic acid fiber and porous polypropylene fiber added in the sand, the thermoplasticity time during the casting pouring process is longer, the stress generated after sand heating is relieved, the retention time of a sand mold is prolonged, the castings are prevented from cracking, the air permeability is improved, the rearrangement and densification of the sand are facilitated in the fiber low-temperature fusion introduction instant liquid state, and the precision of pump valve castings is improved.

Description

A kind of pump valve foundry goods high-compactness modified alkaline phenolic resins self-hardening sand and preparation method thereof
Technical field
The present invention relates to resin sand technical field, particularly relate to a kind of pump valve foundry goods high-compactness modified alkaline phenolic resins 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 pump valve foundry goods high-compactness modified alkaline phenolic resins self-hardening sand and preparation method thereof.
The present invention is achieved by the following technical solutions:
A kind of pump valve foundry goods high-compactness modified alkaline phenolic resins self-hardening sand, this resin sand is prepared by the raw material of following weight portion: active micro silicon powder 20-30, Fine magnesia 40-50, mullite sand 15-20, nano aluminium oxide 0.5-0.6, PLA chopped strand 0.1-0.2, polypropylene chip 0.4-0.5, calcium carbonate 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.
The preparation method of described a kind of pump valve foundry goods high-compactness modified alkaline phenolic resins self-hardening sand is:
(1) first nano aluminium oxide, calcium carbonate, polypropylene chip 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) active micro silicon powder, Fine magnesia, mullite sand are mixed rear 60-100 mesh sieve excessively, 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) interpolation of acid fiber by polylactic and porous polypropylene fibre makes in casting pouring process, there is the longer thermoplasticity time, alleviate sand material by thermogenetic stress, the retention time of sand mold can be improved, also can prevent foundry goods from cracking simultaneously, improve gas permeability, simultaneously introduce moment in fibers at low temperature melting liquid, promote the rearrangement of sand material and densified to improve pump valve casting accuracy.
Detailed description of the invention
This embodiment resin sand is prepared by the raw material of following weight portion: active micro silicon powder 20, Fine magnesia 40, mullite sand 15, nano aluminium oxide 0.5, PLA chopped strand 0.1, polypropylene chip 0.4, calcium carbonate 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 embodiment resin sand is:
(1) first nano aluminium oxide, calcium carbonate, polypropylene chip 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) active micro silicon powder, Fine magnesia, mullite sand are mixed rear mistake 60 mesh sieve, 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 >=20min, 24h tensile strength is 1.42MPa, and core hydroscopicity is low, and gas forming amount reduces by 34% 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 95%, and reclamation of return sand rate can reach 85%.

Claims (4)

1. a pump valve foundry goods high-compactness modified alkaline phenolic resins self-hardening sand, it is characterized in that, this resin sand is prepared by the raw material of following weight portion: active micro silicon powder 20-30, Fine magnesia 40-50, mullite sand 15-20, nano aluminium oxide 0.5-0.6, PLA chopped strand 0.1-0.2, polypropylene chip 0.4-0.5, calcium carbonate 0.01-0.02, phenol-formaldehyde resin modified bonding agent 1-1.5, curing agent 0.3-0.4.
2. a kind of pump valve foundry goods high-compactness modified alkaline phenolic resins self-hardening sand 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. a kind of pump valve foundry goods high-compactness modified alkaline phenolic resins self-hardening sand as claimed in claim 1, it is characterized in that, described curing agent is organosilane ester curing agent.
4. the preparation method of a kind of pump valve foundry goods high-compactness modified alkaline phenolic resins self-hardening sand as claimed in claim 1, it is characterized in that, described preparation method is:
(1) first nano aluminium oxide, calcium carbonate, polypropylene chip 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) active micro silicon powder, Fine magnesia, mullite sand are mixed rear 60-100 mesh sieve excessively, 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.
CN201510813758.1A 2015-11-23 2015-11-23 High-compactness modified alkaline phenolic resin self-hardening sand for pump valve castings and preparation method of high-compactness modified alkaline phenolic resin self-hardening sand Pending CN105414451A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105903889A (en) * 2016-05-26 2016-08-31 合肥市田源精铸有限公司 Anti-adhesion precoated sand
CN105903888A (en) * 2016-05-26 2016-08-31 合肥市田源精铸有限公司 High-temperature-resistant easily-collapsing precoated sand
CN105903886A (en) * 2016-05-26 2016-08-31 合肥市田源精铸有限公司 High-quality molding sand
CN105945207A (en) * 2016-05-26 2016-09-21 合肥市田源精铸有限公司 High-strength high-temperature resistant precoated sand

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01262043A (en) * 1988-04-08 1989-10-18 Acme Resin Corp Method for improving tensile strength of reconditioned sand bonded with ester-cured alkaline phenolic resin
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
CN103074015A (en) * 2013-01-06 2013-05-01 江苏省华源矿业有限公司 Preparation method of modified phenolic resin adhesive
CN103865459A (en) * 2014-03-24 2014-06-18 刘启明 Phenolic resin glue containing potassium ion alkali compound and preparation method thereof
CN104139154A (en) * 2014-07-30 2014-11-12 吴江市液铸液压件铸造有限公司 Phenolic resin self-hardening sand and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01262043A (en) * 1988-04-08 1989-10-18 Acme Resin Corp Method for improving tensile strength of reconditioned sand bonded with ester-cured alkaline phenolic resin
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
CN103074015A (en) * 2013-01-06 2013-05-01 江苏省华源矿业有限公司 Preparation method of modified phenolic resin adhesive
CN103865459A (en) * 2014-03-24 2014-06-18 刘启明 Phenolic resin glue containing potassium ion alkali compound and preparation method thereof
CN104139154A (en) * 2014-07-30 2014-11-12 吴江市液铸液压件铸造有限公司 Phenolic resin self-hardening sand and preparation method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105903889A (en) * 2016-05-26 2016-08-31 合肥市田源精铸有限公司 Anti-adhesion precoated sand
CN105903888A (en) * 2016-05-26 2016-08-31 合肥市田源精铸有限公司 High-temperature-resistant easily-collapsing precoated sand
CN105903886A (en) * 2016-05-26 2016-08-31 合肥市田源精铸有限公司 High-quality molding sand
CN105945207A (en) * 2016-05-26 2016-09-21 合肥市田源精铸有限公司 High-strength high-temperature resistant precoated sand

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