CN105086356B - A kind of modified urea-formaldehyde moulding compound and preparation method thereof - Google Patents
A kind of modified urea-formaldehyde moulding compound and preparation method thereof Download PDFInfo
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- CN105086356B CN105086356B CN201410217898.8A CN201410217898A CN105086356B CN 105086356 B CN105086356 B CN 105086356B CN 201410217898 A CN201410217898 A CN 201410217898A CN 105086356 B CN105086356 B CN 105086356B
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Abstract
The present invention relates to polymer-modified technical field, in particular it relates to which a kind of modified urea-formaldehyde moulding compound, includes the various components of following percentage by weight：Urea moulding material 70 90%；Melamine formaldehyde molding compound 10 30%.Its preparation method comprises the following steps：1）Prepare urea moulding material；2）Prepare melamine formaldehyde molding compound；3）Two kinds of powdery moulding compounds are mixed by a certain percentage；4）By granulation, grain is sieved, separate and then is packaged to be finished product.Compared with prior art, a kind of modified urea-formaldehyde moulding compound that the present invention is provided, can at 150 DEG C continuous 168 hours heating do not ftracture, it is indeformable, can not only keep original plastics outward appearance and keep size stability and other model-performances, method simple practical, is adapted to large-scale industrial production.
Description
Technical field
The present invention relates to polymer-modified technical field, in particular it relates to a kind of modified urea-formaldehyde resin moulding compound and its preparation
Method.
Background technology
Melamine formaldehyde molding compound be based on melamine resin, it is addition filler, releasing agent, pigment, solid
Agent and releasing agent, and be made of certain technique, its bright in luster, smooth in appearance, odorless, tasteless, with higher thermal change
The advantages of shape temperature, fire-retardant, self-extinguishment, resistance to electric arc, product size are stable and water-fast, thus be widely used in electronics, electrical equipment, automobile with
And daily apparatus.
But when processing low-voltage electrical apparatus connector using conventional Lauxite moulding compound, the temperature generally processed exceedes
180 DEG C, process, the phenomenons such as cracking, deformation occur in conventional urea moulding material, reduce for a long time under conditions of this high temperature
The processing efficiency of low-voltage electrical apparatus connector, produces a large amount of substandard products.
Therefore, it is badly in need of providing a kind of modified urea-formaldehyde resin moulding compound and preparation method thereof, to solve the deficiencies in the prior art.
The content of the invention
The invention aims to provide a kind of modified urea-formaldehyde moulding compound and preparation method thereof, by modified ureaformaldehyde mould
Plastics heat resistance is more excellent, can at 145 DEG C laser heating do not ftracture within 168 hours, it is indeformable, while keep itself from
Put out and the advantages of dimensionally stable, the need for processing low-voltage electrical apparatus connector can be met.
The present invention is achieved by the following technical solutions：
A kind of modified urea-formaldehyde moulding compound, includes the various components of following percentage by weight：
Urea moulding material 70-90%；
Melamine formaldehyde molding compound 10-30%.
The urea moulding material includes the various components of following percentage by weight：
Lauxite 45-55%；
Wood pulp 30-35%；
Inorganic filler 1-5%；
Pigment 1-5%；
Curing agent 0.5-2%；
Plasticizer 2-8%；
Releasing agent 0.5-3%.
The preparation method of the Lauxite is as follows：
1）It is 1.5 by the mol ratio of formaldehyde and urea:1 weighs formaldehyde and urea respectively, the formaldehyde of above-mentioned amount is put into anti-
Answer in kettle, start stirring slurry, then sodium hydrate aqueous solution regulation PH≤7.5 of input 10% put into the urea of above-mentioned amount,
Temperature fall under conditions of stirring, steam valve is opened when temperature no longer declines, and 0.1MPa steam is passed through in reacting kettle jacketing
Heating, as temperature of charge rises, reaction solution tends to clarification by milky, i.e., urea dissolves completely；
2) when material temperature rises to 30 DEG C, progressively steam off, steam is completely closed when material temperature rises to 35 DEG C and stops adding
Temperature, material is gradually risen due to addition condensation reason material temperature, is walked when material temperature rises to 40 DEG C according to the bent curvature of a curve of moisture recorder
To judging whether to need to add steam；
3) 60 DEG C are risen to along with temperature, the reaction time is 60 minutes, i.e., to reaction end, obtains described ureaformaldehyde tree
Fat.
The melamine formaldehyde molding compound includes the various components of the following ratio of weight hundred：
Melamine resin 50-55%；
Wood pulp 30-35%；
Inorganic filler 1-3%；
Pigment 1-3%；
Curing agent 1-5%；
Plasticizer 2-4%；
Releasing agent 0.5-1.5%.
The preparation method of the melamine formaldehyde molding compound is as follows：
1）It is 1.75 by the mol ratio of formaldehyde and melamine:1 weighs formaldehyde and melamine respectively, by the first of the amount
In aldehyde input reactor, start stirring slurry, then adjust pH value to 5.0-5.2 with 10% sodium hydrate aqueous solution, then use
NH4OH adjusts solution pH value to 8.2-8.5, then puts into the melamine of the amount；
2) above-mentioned material is heated with the steam of 0.08MPa pressure, controls programming rate, half an hour is heated to 65 DEG C, turned down
Steam valve, keeps the heating of 0.05MPa pressure, material temperature is risen to 70 DEG C i.e. steam off, jacket steam emptying, temperature of charge
78-80 DEG C is slowly raised to, then solution is maintained 20 minutes at 80 ± 1 DEG C, observation material switchs to clarification by milky, produces trimerization
Cyanamide formaldehyde resin；
3) added in kneader after the melamine resin obtained by step 2, then put into the wood pulp of formula ratio, face
Material, inorganic filler, curing agent, releasing agent, open steam jacket heating, carry out vacuum kneading dehydration, control material temperature is in 55-
65 DEG C, 45 minutes heat times, steam is then shut off, is discharged after temperature of charge is down to 40 DEG C；
4) step 3 resulting material is delivered into drier to be dried, each section of its hot blast temperature control is at 85-95 DEG C, heating
150 minutes time, obtain it is aqueous be less than 3% dried granules；
5) by step 4 gained dried granules are size-reduced, ball milling and sieve powder, obtain melamine uniform and with certain fineness
Amine formaldehyde is molded.
Any one or a few composition of the inorganic filler in silicon powder, talcum powder or glass microballoon, institute
The fineness for stating talcum powder is 800-1000 mesh, particle diameter≤20 μm of the glass microballoon.
The composition of any one of the plasticizer in glucoside or ACR or both, the plasticizer choosing
From the composition of any one in glucoside or ACR or both, wherein ACR is acrylate（acrylicester）Altogether
Polymers, belongs to " core-shell structure copolymer " structure copolymer, commercially available to common are ACR-201, ACR-301 and ACR-401 etc., in use, only needing
Add less number and can obtain higher normal temperature and low temperature impact strength, improve the temperature range of processing.
Any one or several composition of the curing agent in SE, GW, SH and UP, SE are sulfamic acid fat
Fat acid esters, GW is urea formaldehyde resin curing agent, and commercially available has GW-2, GW-4, and SH is epoxy resin high temperature roughening and curing agent, commercially available
It is unsaturated polyester resin solidifying agent to have SH-1, UP, preferably UP.
The releasing agent is selected from zinc stearate or calcium stearate.
The preparation method of described modified urea-formaldehyde moulding compound, comprises the following steps：
1）The Lauxite prepared is added in kneader by formula ratio, wood pulp then described in addition formula ratio, nothing
Machine filler, pigment, curing agent and releasing agent, the vacuum dehydration under jacket steam heating, temperature control is at 50-65 DEG C, heating
Between be 1 hour, be then shut off steam, material is cooled to less than 50 DEG C, produces urea moulding material slurry；
2）By step 1）Described urea moulding material slurry feeding drier, controls each section hot blast temperature at 80-95 DEG C, when
Between be 150 minutes, final section is cooled to less than 35 DEG C, obtain water content less than 3% urea moulding material；
3）By step 2）The urea moulding material of gained enters ball mill ball milling 3 hours by the weight of formula than crushing, then
By the weight of formula than putting into the melamine formaldehyde molding compound that has prepared, ball milling discharges separation, fine powder after 3 hours again together
Into semi-finished product, coarse powder is concentrated after ball milling again, shared equally into later ball milling；
4）Will be through step 3）Granulated in the moulding compound input comminutor of mixing, then through sieving grain, isolated certain particle size
The particulate modified molybdenum urea moulding material of scope is packaged as finished product, and fine powder returns ball milling and recycled.
Compared with prior art, a kind of modified urea-formaldehyde moulding compound that the present invention is provided and preparation method thereof, has used ureaformaldehyde
Resin, melamine resin and heat-resisting inorganic filler improve the heat resistance of Lauxite, and the inorganic filler of selection is
Dystectic white powder and solid glass micro-bead, with higher whiteness, the coefficient of expansion is low, and acid number is slightly biased in alkalescent, leads to
Processing and resin crosslinks are crossed, due to melamine and formaldehyde reaction generation melamine resin, in heat resistance, water resistance
It is superior to Lauxite, and the formaldehyde effectively remained in reduction Lauxite, hence it is evident that contained in reduction modified urea-formaldehyde moulding compound
Free aldehyde, improves the environmental condition of post-processing, therefore, the Lauxite by above-mentioned modification has excellent heat resistance, can be
At 150 DEG C continuous 168 hours heating do not ftracture, it is indeformable, can not only keep original plastics outward appearance and keep size stabilization
Property and other model-performances, preparation method is simple and practical, is adapted to large-scale industrial production.
Embodiment
With reference to embodiment, the present invention is described in further detail, is managed to help those skilled in the art
The solution present invention.
Embodiment 1
A kind of modified urea-formaldehyde resin moulding compound, includes the various components of following percentage by weight：
Urea moulding material 90%；
Melamine formaldehyde molding compound 10%.
Wherein, the urea moulding material includes the various components of following percentage by weight：
Lauxite 55%；
Wood pulp 33.3%；
Inorganic filler 2.05%；
Pigment 3%；
Curing agent 0.85%；
Plasticizer 4.8%；
Releasing agent 1%.
The melamine formaldehyde molding compound includes the various components of following percentage by weight：
Melamine resin 53%；
Wood pulp 33%；
Inorganic filler 3%；
Pigment 1%；
Curing agent 5%；
Plasticizer 4%；
Releasing agent 1%.
Wherein, inorganic filler is the talcum powder of 800 mesh, and curing agent is SE, GW-2 and UP composition, and plasticizer is grape
Glucosides, releasing agent is zinc stearate.
Embodiment 2
A kind of modified urea-formaldehyde resin moulding compound, includes the various components of following percentage by weight：
Urea moulding material 85%；
Melamine formaldehyde molding compound 15%.
Wherein, the urea moulding material includes the various components of following percentage by weight：
Lauxite 52.5%；
Wood pulp 34%；
Inorganic filler 5%；
Pigment 3%；
Curing agent 0.5%；
Plasticizer 2%；
Releasing agent 3%.
The melamine formaldehyde molding compound includes the various components of following percentage by weight：
Melamine resin 55%；
Wood pulp 30%；
Inorganic filler 3%；
Pigment 2%；
Curing agent 5%；
Plasticizer 4%；
Releasing agent 1%.
Wherein, inorganic filler is the talcum powder of 1000 mesh, and curing agent is SE, GW-4 and UP composition, and plasticizer is Portugal
Polyglycoside, releasing agent is zinc stearate.
Embodiment 3
A kind of modified urea-formaldehyde resin moulding compound, includes the various components of following percentage by weight：
Urea moulding material 80%；
Melamine formaldehyde molding compound 20%.
Wherein, the urea moulding material includes the various components of following percentage by weight：
Lauxite 50%；
Wood pulp 35%；
Inorganic filler 1%；
Pigment 3%；
Curing agent 5%；
Plasticizer 3%；
Releasing agent 3%.
The melamine formaldehyde molding compound includes the various components of following percentage by weight：
Melamine resin 50%；
Wood pulp 35%；
Inorganic filler 1%；
Pigment 2%；
Curing agent 5%；
Plasticizer 4%；
Releasing agent 1%.
Wherein, inorganic filler is silicon powder, and curing agent is unsaturated polyester resin solidifying agent UP, and plasticizer is ACR-201,
Releasing agent is calcium stearate.
Embodiment 4
A kind of modified urea-formaldehyde resin moulding compound, includes the various components of following percentage by weight：
Urea moulding material 75%；
Melamine formaldehyde molding compound 25%.
Wherein, the urea moulding material includes the various components of following percentage by weight：
Lauxite 55%；
Wood pulp 35%；
Inorganic filler 1%；
Pigment 4%；
Curing agent 1.5%；
Plasticizer 7%；
Releasing agent 1.5%.
The melamine formaldehyde molding compound includes the various components of following percentage by weight：
Melamine resin 55%；
Wood pulp 35%；
Inorganic filler 3%；
Pigment 1%；
Curing agent 3.5%；
Plasticizer 2%；
Releasing agent 0.5%.
Wherein, inorganic filler is that particle diameter is less than≤20um glass microballoon, and curing agent is SE, GW-4 and SH-1 combination
Thing, plasticizer is ACR-401, and releasing agent is zinc stearate.
Embodiment 5
A kind of modified urea-formaldehyde resin moulding compound, includes the various components of following percentage by weight：
Urea moulding material 70%；
Melamine formaldehyde molding compound 30%.
Wherein, the urea moulding material includes the various components of following percentage by weight：
Lauxite 48%；
Wood pulp 34%；
Inorganic filler 5%；
Pigment 3%；
Curing agent 0.5%；
Plasticizer 8%；
Releasing agent 0.5%.
The melamine formaldehyde molding compound includes the various components of following percentage by weight：
Melamine resin 55%；
Wood pulp 35%；
Inorganic filler 3%；
Pigment 3%；
Curing agent 1%；
Plasticizer 2.5%；
Releasing agent 0.5%.
Wherein, inorganic filler is the talcum powder of 900 mesh, and curing agent is GW-4 and SH-1 composition, and plasticizer is ACR-
301, releasing agent is zinc stearate.
Embodiment 6
The preparation method of Lauxite described in embodiment 1-5, comprises the following steps：
1）1800g (22.2mol) formaldehyde and 888g (14.8mol) urea are weighed respectively, the formaldehyde of above-mentioned amount are put into anti-
Answer in kettle, start stirring slurry, the sodium hydrate aqueous solution of input 10% is adjusted to PH≤7.5, then puts into the urea of above-mentioned amount,
The Temperature fall under conditions of stirring, steam valve is opened when temperature no longer declines, and 0.1MPa steamings are passed through in reacting kettle jacketing
Vapour is heated, as temperature of charge rises, and reaction solution tends to clarification by milky, i.e., urea dissolves completely；
2) when material temperature rises to 30 DEG C, progressively steam off, steam is completely closed when material temperature rises to 35 DEG C and stops adding
Temperature, material is gradually risen due to addition condensation reason material temperature, is walked when material temperature rises to 40 DEG C according to the bent curvature of a curve of moisture recorder
To judging whether to need to add steam；
3) 60 DEG C are risen to along with temperature, the reaction time is 60 minutes, i.e., to reaction end, obtains described modified urea-formaldehyde
Resin.
The preparation method of melamine formaldehyde molding compound described in embodiment 1-5, comprises the following steps：
1）1946g (24mol) formaldehyde and 1728g (13.7mol) melamine are weighed respectively, and the formaldehyde of above-mentioned amount is put into
In reactor, start stirring slurry, then adjust pH value to 5.0-5.2 with 10% sodium hydroxide solution, then use NH4OH is adjusted
Then solution pH value puts into the melamine of above-mentioned amount to 8.2-8.5；
2) above-mentioned material is heated with the steam of 0.08MPa pressure, controls programming rate, half an hour is heated to 65 DEG C, turned down
Steam valve, keeps the heating of 0.05MPa pressure, material temperature is risen to 70 DEG C i.e. steam off, jacket steam emptying, temperature of charge
78-80 DEG C is slowly raised to, then solution is maintained 20 minutes at 80 ± 1 DEG C, observation material switchs to clarification by milky, produces trimerization
Cyanamide formaldehyde resin；
3) step 2 is added in kneader）After the melamine resin of gained, then put into the wood pulp of formula ratio, face
Material, inorganic filler, curing agent, releasing agent, open steam jacket heating, carry out vacuum kneading dehydration, control material temperature is in 55-
65 DEG C, 45 minutes heat times, steam is then shut off, is discharged after temperature of charge is down to 40 DEG C；
4) by step 3）Resulting material is delivered to drier and is dried, and each section of its hot blast temperature control is at 85-95 DEG C, heating
150 minutes time, obtain it is aqueous be less than 3% dried granules；
5) by step 4）Gained dried granules are size-reduced, ball milling and sieve powder, obtain trimerization uniform and with certain fineness
Cyanamide formaldehyde is molded.
The preparation method of modified urea-formaldehyde moulding compound described in embodiment 1-5, comprises the following steps：
1）The Lauxite prepared is added in kneader by formula ratio, wood pulp then described in addition formula ratio, nothing
Machine filler, pigment, curing agent and releasing agent, the vacuum dehydration under jacket steam heating, temperature control is at 50-65 DEG C, heating
Between be 1 hour, be then shut off steam, material is cooled to less than 50 DEG C, produces urea moulding material；
2）Urea moulding material slurry described in step 1 is sent into drier, each section hot blast temperature is controlled at 80-95 DEG C, when
Between be 150 minutes, final section is cooled to less than 35 DEG C, obtain water content less than 3% powdery urea moulding material slurry；
3）Urea moulding material obtained by step 3 is entered into ball mill ball milling 3 hours than crushing by the weight of formula, then pressed
The weight of formula is than putting into the melamine formaldehyde molding compound that has prepared, and ball milling discharges separation after 3 hours again together, fine powder into
Semi-finished product, coarse powder is concentrated after ball milling again, is shared equally into later ball milling；
4）The moulding compound mixed through step 3 is put into comminutor and granulated, then through sieving grain, isolated certain particle size model
The particulate modified molybdenum urea moulding material enclosed is packaged as finished product, and fine powder returns ball milling and recycled.
Modified urea-formaldehyde resin moulding compound obtained by embodiment 1-5 is subjected to heat resistance test, it is as a result as follows：
| Pilot project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 |
| 160 DEG C of baking ovens are continuously toasted 168 hours | It is non-foaming, indeformable | Do not ftracture, it is indeformable | Do not ftracture, it is non-foaming | Do not ftracture non-foaming indeformable | Do not ftracture non-foaming indeformable |
| Bending strength（MPa） | 97 | 96 | 99 | 98 | 97 |
| Insulaion resistance Ω | ≥1x1012 | ≥1x1012 | ≥1x1012 | ≥1x1012 | ≥1x1012 |
Above-described embodiment, simply presently preferred embodiments of the present invention, not for limiting the practical range of the present invention, thus it is all with
The equivalent change or modification that feature and principle described in the claims in the present invention are done, all should be included in the claims in the present invention model
Within enclosing.
Claims (8)
1. a kind of modified urea-formaldehyde moulding compound, it is characterised in that the various components including following percentage by weight：Urea moulding material
70-90%；Melamine formaldehyde molding compound 10-30%；
The urea moulding material includes the various components of following percentage by weight：Lauxite 45-55%；Wood pulp 30-35%；
Inorganic filler 1-5%；Pigment 1-5%；Curing agent 0.5-2%；Plasticizer 2-8%；Releasing agent 0.5-3%；
The melamine formaldehyde molding compound includes the various components of following percentage by weight:Melamine resin 50-
55%；Wood pulp 30-35%；Inorganic filler 1-3%；Pigment 1-3%；Curing agent 1-5%；Plasticizer 2-4%；Releasing agent 0.5-1.5%.
2. urea moulding material as claimed in claim 1, it is characterised in that the preparation method of the Lauxite is as follows：
1）It is 1.5 by the mol ratio of formaldehyde and urea:1 weighs formaldehyde and urea respectively, and the formaldehyde of above-mentioned amount is put into reactor
It is interior, start stirring slurry, then sodium hydrate aqueous solution regulation pH≤7.5 of input 10% put into the urea of above-mentioned amount, in stirring
Under conditions of Temperature fall, open steam valve when temperature no longer declines, be passed through in reacting kettle jacketing 0.1MPa steam heating,
As temperature of charge rises, reaction solution tends to clarification by milky, i.e., urea dissolves completely；
2) when material temperature rises to 30 DEG C, progressively steam off, steam is completely closed when material temperature rises to 35 DEG C and stops heating, thing
Material is gradually risen due to addition condensation reason material temperature, moves towards to judge according to the bent curvature of a curve of moisture recorder when material temperature rises to 40 DEG C
Whether need to add steam；
3) 60 DEG C are risen to along with temperature, the reaction time is 60 minutes, i.e., to reaction end, obtains described Lauxite.
3. modified urea-formaldehyde moulding compound as claimed in claim 1, it is characterised in that：The preparation of the melamine formaldehyde molding compound
Method is as follows：
1）It is 1.75 by the mol ratio of formaldehyde and melamine:1 weighs formaldehyde and melamine respectively, and the formaldehyde of the amount is thrown
Enter in reactor, start stirring slurry, then adjust pH value to 5.0-5.2 with 10% sodium hydrate aqueous solution, then use NH4OH
Solution ph is adjusted to 8.2-8.5, the melamine of the amount is then put into；
2) above-mentioned material is heated with the steam of 0.08MPa pressure, controls programming rate, half an hour is heated to 65 DEG C, turns down steam
Valve, keeps the heating of 0.05MPa pressure, material temperature is risen to 70 DEG C i.e. steam off, and jacket steam is emptied, and temperature of charge is slowly
78-80 DEG C is risen to, then solution is maintained 20 minutes at 80 ± 1 DEG C, observation material switchs to clarification by milky, produces melamine
Formaldehyde resin；
3) step 2 is added in kneader）After the melamine resin of gained, then put into the wood pulp, pigment, nothing of formula ratio
Machine filler, curing agent, releasing agent, open steam jacket heating, carry out vacuum kneading dehydration, control material temperature at 55-65 DEG C,
45 minutes heat times, steam is then shut off, is discharged after temperature of charge is down to 40 DEG C；
4) by step 3）Resulting material is delivered to drier and is dried, and each section of its hot blast temperature control is in 85-95 DEG C, heat time
150 minutes, obtain it is aqueous be less than 3% dried granules；
5) by step 4）Gained dried granules are size-reduced, ball milling and sieve powder, obtain melamine uniform and with certain fineness
Formaldehyde is molded.
4. the modified urea-formaldehyde moulding compound as described in claim 1 or 2 or 3, it is characterised in that：It is micro- that the inorganic filler is selected from silicon
Any one or a few composition in powder, talcum powder or glass microballoon, the fineness of the talcum powder is 800-1000 mesh, institute
State particle diameter≤20 μm of glass microballoon.
5. the modified urea-formaldehyde moulding compound as described in claim 1 or 2 or 3, it is characterised in that：The plasticizer is selected from glucoside
Or the composition of any one in ACR or both.
6. the modified urea-formaldehyde moulding compound as described in claim 1 or 2 or 3, it is characterised in that：The curing agent is selected from SE, GW, SH
With any one in UP or several compositions.
7. the modified urea-formaldehyde moulding compound as described in claim 1 or 2 or 3, it is characterised in that：The releasing agent is selected from zinc stearate
Or calcium stearate.
8. the preparation method of the modified urea-formaldehyde moulding compound as described in claim 1 or 2 or 3, it is characterised in that including following step
Suddenly：
1）The Lauxite prepared is added in kneader by formula ratio, the wood pulp described in formula ratio is then added, inorganic fills out
Material, pigment, curing agent and releasing agent, the vacuum dehydration under jacket steam heating, temperature control is at 50-65 DEG C, and the heat time is 1
Hour, steam is then shut off, material is cooled to less than 50 DEG C, produces urea moulding material slurry；
2）By step 1）Described urea moulding material slurry feeding drier, controls each section hot blast temperature at 80-95 DEG C, and the time is
150 minutes, final section was cooled to less than 35 DEG C, obtained the urea moulding material that water content is less than 3%；
3）By step 2）The urea moulding material of gained enters ball mill ball milling 3 hours by the weight of formula than crushing, then by with
The weight of side is than putting into the melamine formaldehyde molding compound that has prepared, and ball milling discharge separation after 3 hours again together, and fine powder is into partly
Finished product, coarse powder is concentrated after ball milling again, is shared equally into later ball milling；
4）Will be through step 3）Granulated in the moulding compound input comminutor of mixing, then through sieving grain, isolated certain particle size scope
Particulate modified molybdenum urea moulding material be packaged as finished product, fine powder returns ball milling and recycled.
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| CN105542391A (en) * | 2016-02-02 | 2016-05-04 | 温州达源贸易有限公司 | Urea-formaldehyde molding powder and preparation method thereof |
| CN107556698B (en) * | 2017-10-12 | 2019-08-09 | 溧阳市乔森塑料有限公司 | A kind of high temperature resistant urea moulding material and preparation method thereof |
| CN108084649A (en) * | 2017-12-29 | 2018-05-29 | 溧阳市乔森塑料有限公司 | Modified melamine-formaldehyde moulding compound and its preparation method and application |
| CN108819001B (en) * | 2018-05-10 | 2020-11-10 | 温州乔建塑料有限公司 | Manufacturing process of urea molding plastic particles with antibacterial, antistatic and high gloss |
| CN114591594B (en) * | 2022-03-11 | 2022-12-13 | 溧阳市乔森塑料有限公司 | High-strength granular urea-formaldehyde molding compound |
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