CN105414454A - PPTA(poly-p-phenylene terephthamide)-pulp enhanced modified alkaline phenolic resin self-hardening sand for pump valve castings and preparation method of PPTA-pulp enhanced modified alkaline phenolic resin self-hardening sand - Google Patents
PPTA(poly-p-phenylene terephthamide)-pulp enhanced modified alkaline phenolic resin self-hardening sand for pump valve castings and preparation method of PPTA-pulp enhanced modified alkaline phenolic resin self-hardening sand Download PDFInfo
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- CN105414454A CN105414454A CN201510813847.6A CN201510813847A CN105414454A CN 105414454 A CN105414454 A CN 105414454A CN 201510813847 A CN201510813847 A CN 201510813847A CN 105414454 A CN105414454 A CN 105414454A
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Abstract
The invention discloses PPTA(poly-p-phenylene terephthamide)-pulp enhanced modified alkaline phenolic resin self-hardening sand for pump valve castings. An adopted modified phenolic resin adhesive 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; nano-titanium dioxide porous polypropylene fiber blended in the sand has the effects of toughening, reinforcing, and improving the heat resistance of fibers, and forms complex and uniform meshy structures in a sand mold, so that the molding compactness and air permeability of the molding sand are improved, the finished product ratio of the castings is higher, and collapse and cleaning are facilitated after pouring; and PPTA-pulp has a unique surface structure, so that the attachment force among raw materials can be improved, the reinforcement purpose is achieved, the shrinkage rate is low, the rebound resilience is good, the thermal deformability of the molding sand can be improved, and the castings are prevented from heat checking.
Description
Technical field
The present invention relates to resin sand technical field, particularly relate to modified alkaline phenolic resins self-hardening sand of a kind of pump valve foundry goods Fanglun slurry cake enhancing 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, modified alkaline phenolic resins self-hardening sand providing a kind of pump valve foundry goods Fanglun slurry cake to strengthen and preparation method thereof.
The present invention is achieved by the following technical solutions:
The modified alkaline phenolic resins self-hardening sand that pump valve foundry goods Fanglun slurry cake strengthens, this resin sand is prepared by the raw material of following weight portion: quartz sand 70-80, brown alundum powder 20-30, hollow glass micropearl 8-10, Fanglun slurry cake 0.4-0.5, nano titanium oxide 0.4-0.5, 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.
The preparation method of the modified alkaline phenolic resins self-hardening sand that described a kind of pump valve foundry goods Fanglun slurry cake strengthens is:
(1) first nano titanium oxide, 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) 60-100 mesh sieve was pulverized after quartz sand, brown alundum powder, hollow glass micropearl, Fanglun slurry cake being mixed, the material that sieves 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 of blending nano titanium oxide has the heat resistance of toughness reinforcing, reinforcement, raising fiber, it forms complicated uniform network structure in sand mold, improve the shaping degree of packing of molding sand and gas permeability, casting yield is higher, defeated and dispersed cleaning of being more convenient for after cast terminates.
(3) Fanglun slurry cake has unique surface texture, and can improve the grasping force between raw material, reach the object of enhancing, shrinkage factor is low, and resilience is good, can improve the hot deformability of molding sand, prevent casting thermal fragmentation.
Detailed description of the invention
This embodiment resin sand is prepared by the raw material of following weight portion: quartz sand 70, brown alundum powder 20, hollow glass micropearl 8, Fanglun slurry cake 0.4, nano titanium oxide 0.4, 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 nano titanium oxide, 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) 60 mesh sieves were pulverized after quartz sand, brown alundum powder, hollow glass micropearl, Fanglun slurry cake being mixed, the material that sieves 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 1.52MPa, and core hydroscopicity is low, and gas forming amount reduces by 40% 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 modified alkaline phenolic resins self-hardening sand that strengthens with Fanglun slurry cake of a 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, brown alundum powder 20-30, hollow glass micropearl 8-10, Fanglun slurry cake 0.4-0.5, nano titanium oxide 0.4-0.5, 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 modified alkaline phenolic resins self-hardening sand of a kind of pump valve foundry goods Fanglun slurry cake enhancing 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 modified alkaline phenolic resins self-hardening sand of a kind of pump valve foundry goods Fanglun slurry cake enhancing as claimed in claim 1, it is characterized in that, described curing agent is organosilane ester curing agent.
4. the preparation method of the modified alkaline phenolic resins self-hardening sand of a kind of pump valve foundry goods Fanglun slurry cake enhancing as claimed in claim 1, it is characterized in that, described preparation method is:
(1) first nano titanium oxide, 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) 60-100 mesh sieve was pulverized after quartz sand, brown alundum powder, hollow glass micropearl, Fanglun slurry cake being mixed, the material that sieves 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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| CN201510813847.6A CN105414454A (en) | 2015-11-23 | 2015-11-23 | PPTA(poly-p-phenylene terephthamide)-pulp enhanced modified alkaline phenolic resin self-hardening sand for pump valve castings and preparation method of PPTA-pulp enhanced modified alkaline phenolic resin self-hardening sand |
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| CN201510813847.6A CN105414454A (en) | 2015-11-23 | 2015-11-23 | PPTA(poly-p-phenylene terephthamide)-pulp enhanced modified alkaline phenolic resin self-hardening sand for pump valve castings and preparation method of PPTA-pulp enhanced modified alkaline phenolic resin self-hardening sand |
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| CN105414454A true CN105414454A (en) | 2016-03-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109761598A (en) * | 2019-01-12 | 2019-05-17 | 杨忠华 | A kind of preparation method of ceramic electrolyte |
| CN110899618A (en) * | 2019-11-01 | 2020-03-24 | 王海江 | Casting process method for improving appearance of casting sand grains and improving strength of sand mold |
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| 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 |
| CN101927317A (en) * | 2010-09-03 | 2010-12-29 | 吴江市液铸液压件铸造有限公司 | Furane self-hardening sand |
| CN101941044A (en) * | 2010-09-03 | 2011-01-12 | 吴江市液铸液压件铸造有限公司 | Alkaline phenolic resin self-hardening sand |
| EP2359957A1 (en) * | 2010-01-26 | 2011-08-24 | Foseco International Limited | Method and composition for the preparation of foundry moulds and cores |
| CN104107874A (en) * | 2014-07-30 | 2014-10-22 | 吴江市液铸液压件铸造有限公司 | Self-hardening sand additive for casting resin and preparation method of self-hardening sand additive |
| 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 |
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- 2015-11-23 CN CN201510813847.6A patent/CN105414454A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| EP2359957A1 (en) * | 2010-01-26 | 2011-08-24 | Foseco International Limited | Method and composition for the preparation of foundry moulds and cores |
| CN101927317A (en) * | 2010-09-03 | 2010-12-29 | 吴江市液铸液压件铸造有限公司 | Furane self-hardening sand |
| CN101941044A (en) * | 2010-09-03 | 2011-01-12 | 吴江市液铸液压件铸造有限公司 | Alkaline phenolic resin self-hardening sand |
| CN104107874A (en) * | 2014-07-30 | 2014-10-22 | 吴江市液铸液压件铸造有限公司 | Self-hardening sand additive for casting resin and preparation method of self-hardening sand additive |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109761598A (en) * | 2019-01-12 | 2019-05-17 | 杨忠华 | A kind of preparation method of ceramic electrolyte |
| CN110899618A (en) * | 2019-11-01 | 2020-03-24 | 王海江 | Casting process method for improving appearance of casting sand grains and improving strength of sand mold |
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Application publication date: 20160323 |