CN106827771A - A kind of high rigidity melamine sheeting caps and preparation method thereof - Google Patents
A kind of high rigidity melamine sheeting caps and preparation method thereof Download PDFInfo
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- CN106827771A CN106827771A CN201611185656.0A CN201611185656A CN106827771A CN 106827771 A CN106827771 A CN 106827771A CN 201611185656 A CN201611185656 A CN 201611185656A CN 106827771 A CN106827771 A CN 106827771A
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- melamine
- high rigidity
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- sheeting caps
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/02—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board the layer being formed of fibres, chips, or particles, e.g. MDF, HDF, OSB, chipboard, particle board, hardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
- B32B21/04—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B21/06—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/47—Condensation polymers of aldehydes or ketones
- D21H17/49—Condensation polymers of aldehydes or ketones with compounds containing hydrogen bound to nitrogen
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/47—Condensation polymers of aldehydes or ketones
- D21H17/49—Condensation polymers of aldehydes or ketones with compounds containing hydrogen bound to nitrogen
- D21H17/51—Triazines, e.g. melamine
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
- B32B2260/028—Paper layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
- B32B2260/046—Synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/536—Hardness
Abstract
The invention discloses a kind of high rigidity melamine sheeting caps and preparation method thereof, the backing plate first attaches melamine facial tissue with fiberboard as substrate in substrate upper and lower surface, and then compacting is formed in predefined conditions；The melamine facial tissue is immersed in pollopas and cyanurotriamide modified urine glue by paper, soaking is secondary cover painting by way of prepare；The melamine facial tissue can be effectively increased the hardness and density of backing plate, while increasing by 2 4% syrup in urea-formaldehyde glue, can be effectively improved pad surfaces finish and play a part of moistureproof, warpage preventing；From drilling performance, high rigidity melamine sheeting caps prepared by the present invention can more effectively avoid Drill Crack, while reducing burr to greatest extent, improving borehole accuracy, slow down tool wear, greatly improve the utilization rate of drill point；Further, the high rigidity melamine sheeting caps that the present invention is provided also has good environment protecting and cost performance, adapts to and meet development and the demand of high-end, high-accuracy PCB drillings application.
Description
Technical field
The present invention relates to printed circuit board field, more particularly to a kind of high rigidity melamine sheeting caps and preparation method thereof.
Background technology
Printed circuit board drill hole is typically, by 1 to several dual platens or multi-layer sheet, to be piled up and got out respectively with Digit Control Machine Tool
The through hole of diameter is planted, to connect to form loop each sandwich circuit of printed wiring board.In Digit Control Machine Tool boring procedure, each double exposure
Wiring board bottom processed needs, with a backing plate, for ensuring that wiring board is drilled out, and not injuring Digit Control Machine Tool table top.This pad
Plate is exactly printed circuit board drill hole backing plate.
Traditional printed circuit board drill hole backing plate mainly has melaminated paper to be laminated backing plate, sheeting caps and composite construction sheeting caps
Deng；But melaminated paper lamination backing plate there are problems that production process it is many,；And sheeting caps and composite construction sheeting caps,
Generally there is thickness deviation big, case hardness is low, warpage is larger, yielding, moisture-sensitive the problems such as so that influence borehole accuracy,
There is burr.
Therefore, prior art has yet to be improved and developed.
The content of the invention
In view of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of high rigidity melamine sheeting caps and its system
Preparation Method, it is intended to solve existing boring backing plate and have that case hardness is low, warpage is larger, yielding, moisture-sensitive, drilling burr
Greatly, the low problem of borehole accuracy.
Technical scheme is as follows：
A kind of preparation method of high rigidity melamine sheeting caps, wherein, including step：
A, temperature be 110~170 DEG C, speed be 18~23m/min under conditions of, paper is impregnated into well prepared in advance
Lauxite and cyanurotriamide modified urine glue in, prepared spread is 50~60% melamine facial tissue；
B, the melamine facial tissue is attached to the upper and lower surface of substrate respectively after, be put into it is pre-conditioned under press in carry out
Compacting, obtains high rigidity melamine sheeting caps.
It is preferred that the preparation method of described high rigidity melamine sheeting caps, wherein, the Lauxite is by weight percentage
Meter includes：The formaldehyde of 45%-52%, the urea of 20%-25%, the black network tropine of 2.4%-2.6%, the water of 7%-8% and
The ammonia spirit of 4%-5%.
It is preferred that the preparation method of described high rigidity melamine sheeting caps, wherein, the amount of solid of the Lauxite is 41
~47%, gel time is 100~150s.
It is preferred that the preparation method of described high rigidity melamine sheeting caps, wherein, the cyanurotriamide modified urine glue is by weight
Amount percentages include：The formaldehyde of 42%-50%, the methyl alcohol of 18%-20%, the urea of 15%-19%, the crow of 2.4%-3%
The ammonia spirit of network tropine, the melamine of 6%-6.9%, the water of 7%-8% and 4%-5%.
It is preferred that the preparation method of described high rigidity melamine sheeting caps, wherein, the cyanurotriamide modified urine glue is consolidated
The scale of construction is 46~50%, and gel time is 70~90s.
It is preferred that the preparation method of described high rigidity melamine sheeting caps, wherein, pre-conditioned in the step B is：
Press pressure is 45~110bar, and temperature first is increased into 135~155 DEG C in 1~10min, is then incubated 70~110min.
It is preferred that the preparation method of described high rigidity melamine sheeting caps, wherein, the substrate is that density is 800-
1000kg/m3Fiberboard.
It is preferred that the preparation method of described high rigidity melamine sheeting caps, wherein, the thickness of the substrate is 2.35-
2.65mm。
It is preferred that the preparation method of described high rigidity melamine sheeting caps, wherein, the paper in the step A is titanium white
One kind in paper, balance paper, bleached wood pulp paper.
A kind of high rigidity melamine sheeting caps, wherein, prepared using above-mentioned any one preparation method.
Beneficial effect：The invention provides a kind of high rigidity melamine sheeting caps and preparation method thereof, the backing plate is with highly dense
Degree or the close wood-fiber board of superelevation be substrate, first substrate upper and lower surface attach melamine facial tissue, then in predefined conditions compacting and
Into；The melamine facial tissue is immersed in pollopas and cyanurotriamide modified urine glue by paper, and painting is covered by the way that soaking is secondary
Mode prepare；From drilling performance, high rigidity melamine sheeting caps prepared by the present invention can more effectively avoid drill bit from breaking
Split, while reducing burr to greatest extent, improving borehole accuracy, slow down tool wear, greatly improve the utilization rate of drill point；Enter one
Step, the high rigidity melamine sheeting caps that the present invention is provided also has good environment protecting and cost performance, adapts to and meet high-end, height
The development of accurate PCB drillings application and demand.
Brief description of the drawings
Fig. 1 is a kind of flow chart of the preparation method preferred embodiment of high rigidity melamine sheeting caps of the invention.
Specific embodiment
The present invention provides a kind of high rigidity melamine sheeting caps and preparation method thereof, to make the purpose of the present invention, technical scheme
And effect is clearer, clear and definite, the present invention is described in more detail below.It should be appreciated that specific implementation described herein
Example is only used to explain the present invention, is not intended to limit the present invention.
Fig. 1 is referred to, Fig. 1 is a kind of flow of the preparation method preferred embodiment of high rigidity melamine sheeting caps of the invention
Figure, as illustrated, it includes step：
S100, temperature be 110~170 DEG C, speed be 18~23m/min under conditions of, by paper be impregnated into advance system
In the Lauxite and cyanurotriamide modified urine glue got ready, prepared spread is 50~60% melamine facial tissue；
Further, the Lauxite includes by weight percentage：The formaldehyde of 45%-52%, the urine of 20%-25%
Element, the ammonia spirit of the black network tropine, the water of 7%-8% and 4%-5% of 2.4%-2.6%.
Specifically, the preparation method of the Lauxite is as follows：First formaldehyde and water are mixed, black network is added
Tropine, adjusts PH=8~8.5, adds first time urea；Begin to warm up, because of exothermic reaction, heating should be stopped at 52 DEG C, lead to
Cross exothermic reaction control and 80-85 DEG C was warming up at 50 minutes, and 30 minutes are incubated at 80-85 DEG C, adjustment pH value is in 7.5-8.5
Between；After time arrives, ammonia spirit is added, PH is progressively dropped to 4.1-3.8 by the reaction of 30-70 minutes, should now noted
Meaning reaction starts to accelerate；Start simultaneously in 10 DEG C or so of water, survey water chaotic degree and water number；When water number reaches 1：5.0~5.9
When add ammonia spirit immediately, regulation pH value is between 8-9, and water flowing is lowered the temperature；Add second urea when cooling to 78 DEG C, drop
Temperature is cooled to 40 DEG C of filtering blowings, you can Lauxite is obtained to 50 DEG C of ammonification aqueous solution.
Lauxite outward appearance prepared by the present invention is colourless to micro white transparency liquid；Water number is 1：2.5-4.0；Viscosity is
13.5-16 seconds；Gel time is 100-150 seconds；Amount of solid is 41-47%；PH value is 7-8；Density is 1.14kg/m3。
Further, the cyanurotriamide modified urine glue includes by weight percentage：The formaldehyde of 42%-50%, 18%-
20% methyl alcohol, the urea of 15%-19%, the black network tropine of 2.4%-3%, the melamine of 6%-6.9%, 7%-8%
The ammonia spirit of water and 4%-5%.
Specifically, the preparation method of the cyanurotriamide modified urine glue is as described below：Sequentially add formaldehyde, water, black network support
Product adjustment pH value is 8.5, adds melamine, urea；After stirring and evenly mixing, start to warm up, material heats up in 30 minutes
To 70-75 DEG C (reaction solution starts transparent at 60 DEG C, and now pH value should be 7.5-8.0)；Insulation adds methyl alcohol to rise again after 30 minutes
Temperature is incubated 1.5 hours to 70-73 DEG C；Time adds ammonia spirit, and water flowing to lower the temperature after；Stirring to blowing again at 40 DEG C,
Can be prepared by cyanurotriamide modified urine glue.
Cyanurotriamide modified urine glue outward appearance prepared by the present invention is colourless to micro, slight yellow transparent liquid；Viscosity is 12.5-
14.5 seconds；Gel time is 70-90 seconds；Amount of solid is 46-50%；PH value is 7.5-8.
Further, in step S100 of the present invention, the melamine facial tissue is the ureaformaldehyde tree that paper impregnates above-mentioned preparation
Fat and cyanurotriamide modified urine glue, using soaking is secondary cover painting by the way of, carried out on the basis of suitable spread is controlled
Appropriateness baking is prepared, and the paper is the one kind in titanium white paper, balance paper, bleached wood pulp paper, the tool of the melamine facial tissue
Preparation process is as follows：
1st, the proportioning of resin is carried out, Lauxite and cyanurotriamide modified urine glue is adjusted by controlling the addition of curing agent
Hardening time, specifically, in rear machine Lauxite add 0.2~0.35% curing agent and 0.3% ingot stripper make it
Hardening time be 6 points 50 seconds~7 points 30 seconds；The curing agent and 0.3% of day addition 0.24~0.39% in middle machine Lauxite
Releasing agent make its hardening time be 6 points 20 seconds~7 points；Add 2~4% syrup stirring equal in cyanurotriamide modified urine glue
After even, add 4~5% curing agent and 1% releasing agent make its hardening time for 5 points~5 points 30 seconds；By in melamine
Amine is modified and urinates the syrup of addition 2~4% in glue, can be effectively improved the surface smoothness of backing plate, and can play protection against the tide, avoid warpage
Effect.
Further, the syrup is by weight being 100 by white sugar and water:60 proportioning is prepared, specially：By water
White sugar is added in the case of being warming up to 40~50 DEG C, continues to heat, sugar and water mixture is warming up to 100 DEG C of boilings, kept for 20 points
Clock or so, continues to observe white sugar in kettle and has been dissolved entirely and in as clear as crystal shape liquid, if all dissolvings, start water flowing
Cooling, is cooled to 45 DEG C of filtering blowings, and barreled is stand-by；
2nd, body paper is hung on by standard operation, wears paper and walk to store paper machine, S rollers, walk to carry on the back paint roller, crossed breathing roller and walk the 1st, No. 3 time delays
Paper injection crosses Extruded roller under roller, crosses once floating roller and arrives at chain again；
3rd, rear machine, middle machine use Lauxite Special agitating tank, uniform stirring after resin burned hardening time, using special
Glue basin carries out filtering and puts glue；
4th, the upper and lower applicator roll of middle machine must be cleaned out, and set second glue spreading parameter, get out side scraper, adhesive tape；Do
Good equipment point-detecting；
5th, technological parameter is set：
By in 110~170 DEG C of temperature, under the conditions of 18~23m/min of speed, impregnation spread 50-60%, volatilization being obtained
Thing 5%-7%, procuring degree 30%-50%, melamine facial tissue of square grammes per square metre in 180-187.
S200, the melamine facial tissue is attached to the upper and lower surface of substrate respectively after, be put into it is pre-conditioned under press in
Suppressed, obtained high rigidity melamine sheeting caps.
Specifically, in the present invention, the substrate is that density is 800-1000kg/m3, thickness is the fibre of 2.35-2.65mm
Dimension plate, after the melamine facial tissue is attached into the upper and lower surface of the substrate respectively, is put into hydraulic press and is suppressed, the oil
Press is provided with pre-conditioned.
Specifically, the pressure value of the hydraulic press remains at 45~110bar, in the temperature rise period, make temperature 1~
Temperature is increased to 135~155 DEG C in 10min；Subsequently into holding stage, maintain the temperature at 135~155 DEG C when it is a length of
70-110min；Further, admission valve is closed in 20min before insulation terminates, steam bleeding is opened in 10min before insulation terminates
Valve；The finally water flowing cooling after insulation terminates, makes press cool down 40~90min.
Based on a kind of above-mentioned preparation method of high rigidity melamine sheeting caps, the present invention also provides a kind of high rigidity melamine headblock
Plate, wherein, prepared using above-mentioned any one preparation method.
The present invention program is further explained below by specific embodiment：
Embodiment 1
1st, according to the Lauxite and cyanurotriamide modified pollopas and syrup of above-mentioned resin preparation process
2nd, paper impregnation
Facial tissue is that, with Lauxite and cyanurotriamide modified urine glue prepared by 85g browns titanium white paper dipping above-mentioned 1, body paper leads to
The secondary mode for covering painting of soaking is crossed, appropriate baking is carried out on the basis of suitable spread is controlled, to reach the half of regulation
The production technology of finished product index.
A, resin proportioning：
Afterwards the hardening time of machine Lauxite be 7 points 10 seconds~7 points 50 seconds；
The hardening time of middle machine Lauxite be 7 points 10 seconds~7 points 50 seconds；2-4% is added in cyanurotriamide modified urine glue
After syrup stirs, add curing agent hardening time for 6 points 10 seconds~6 points 40 seconds；The releasing agent of middle machine Lauxite
Dosage is 0.4%；
| Resin title | Curing agent dosage | 185 releasing agent dosages |
| Lauxite | 0.2-0.35% | 0.4% |
| Cyanurotriamide modified urine glue | 2.5~3.5% | 0.7% |
B, body paper is hung on by standard operation, wear paper and walk to store paper machine, S rollers, walk to carry on the back paint roller, crossed breathing roller and walk the 1st, No. 3 time delays
Paper injection crosses Extruded roller under roller, crosses once floating roller and arrives at chain again；
C, rear machine, middle machine use Lauxite Special agitating tank, uniform stirring after resin burned hardening time, using special
Glue basin carries out filtering and puts glue；
D, the upper and lower applicator roll of middle machine must be cleaned out, and set second glue spreading parameter, get out side scraper, adhesive tape；Do
Good equipment point-detecting；
E, technological parameter are set:
F, dipping gained semi-finished product are grey melamine facial tissue, in 108~175 DEG C of cabinet temperature, speed 19~23m/min conditions
Under, impregnation spread 56-58%, volatile matter 6%-8.5%, procuring degree 22%-36% is obtained, square grammes per square metre is in 200-207
Semi-finished product grey melamine facial tissue.
3rd, suppress
Substrate is high density fiberboard or VHD fiberboard, density 800-1000kg/m3, thickness 2.35-2.65mm
It is substrate, substrate upper and lower surface is suppressed in predefined conditions with above-mentioned case study on implementation k pre-impregnated semi-finished products grey melamine facial tissue respectively
Form；15 are often laminated, every layer uses 24pcs ox-hide packing paper of the same race up and down.
Production board is matched：2pcs gluing facial tissue+1pcs (2.35-2.65mm) wood-fiber board
As a result：The close sheeting caps angularity ＜ 0.5% of grey tryptamines, thickness deviation ± 0.10mm, hardness 90-95 are suppressed,
Density 1400-1422kg/m3, the smooth free from admixture in surface, odorlessness, drilling burr it is small, without broken needle.
Embodiment 2：
1st, according to the Lauxite and cyanurotriamide modified pollopas and syrup of above-mentioned resin preparation process；
2nd, paper impregnation
Facial tissue is that, with Lauxite and cyanurotriamide modified urine glue prepared by 80g white titanium white papers dipping above-mentioned 1, body paper leads to
The secondary mode for covering painting of soaking is crossed, appropriate baking is carried out on the basis of suitable spread is controlled, to reach the half of regulation
The production technology of finished product index.
A, resin proportioning：
Afterwards the hardening time of machine Lauxite be 7 points 10 seconds~7 points 50 seconds；
The hardening time of middle machine Lauxite be 7 points 10 seconds~7 points 50 seconds；2-4% is added in cyanurotriamide modified urine glue
After syrup stirs, add curing agent hardening time for 6 points 10 seconds~6 points 40 seconds；The releasing agent of middle machine Lauxite
Dosage is 0.2%；
B, body paper is hung on by standard operation, wear paper and walk to store paper machine, S rollers, walk to carry on the back paint roller, crossed breathing roller and walk the 1st, No. 3 time delays
Paper injection crosses Extruded roller under roller, crosses once floating roller and arrives at chain again；
C, rear machine, middle machine use Lauxite Special agitating tank, uniform stirring after resin burned hardening time, using special
Glue basin carries out filtering and puts glue；
D, the upper and lower applicator roll of middle machine must be cleaned out, and set second glue spreading parameter, get out side scraper, adhesive tape；Do
Good equipment point-detecting；
E, technological parameter are set:
F, dipping gained semi-finished product are grey melamine facial tissue, in 95~167 DEG C of cabinet temperature, speed 17.5~20m/min bars
Under part, impregnation spread 55-58%, volatile matter 5%-7%, procuring degree 34%-50% is obtained, square grammes per square metre is in 180-187
Semi-finished product grey melamine facial tissue.
3rd, compacting substrate is high density fiberboard or VHD fiberboard, density 800-1000kg/m3, thickness 2.35-
2.65mm is substrate, and substrate upper and lower surface is respectively with above-mentioned case study on implementation k pre-impregnated semi-finished products white melamine facial tissue in predetermined condition
Lower compacting is formed.15 are often laminated, every layer uses 24pcs ox-hide packing paper of the same race up and down；Production board is matched：2pcs gluings facial tissue+
1pcs (2.35-2.65mm) wood-fiber board
As a result：The close sheeting caps angularity ＜ 0.5% of white amine, thickness deviation ± 0.10mm, hardness 90-95 are suppressed,
Density 1392-1420kg/m3, the smooth free from admixture in surface, odorlessness, drilling burr it is small, without broken needle.
In sum, the invention provides a kind of high rigidity melamine sheeting caps and preparation method thereof, the backing plate is with highly dense
Degree or the close wood-fiber board of superelevation be substrate, first substrate upper and lower surface attach melamine facial tissue, then in predefined conditions compacting and
Into；The melamine facial tissue is immersed in pollopas and cyanurotriamide modified urine glue by paper, and painting is covered by the way that soaking is secondary
Mode prepare；The melamine facial tissue can be effectively increased the hardness and density of backing plate, while increasing 2-4% in urea-formaldehyde glue
Syrup, can be effectively improved pad surfaces finish and play a part of moistureproof, warpage preventing；From drilling performance, prepared by the present invention
High rigidity melamine sheeting caps can more effectively avoid Drill Crack, while to greatest extent reduce burr, improve borehole accuracy, subtract
Slow tool wear, greatly improves the utilization rate of drill point；Further, the high rigidity melamine sheeting caps that the present invention is provided also has good
Good environment protecting and cost performance, adapt to and meet development and the demand of high-end, high-accuracy PCB drillings application.
It should be appreciated that application of the invention is not limited to above-mentioned citing, and for those of ordinary skills, can
To be improved according to the above description or converted, all these modifications and variations should all belong to the guarantor of appended claims of the present invention
Shield scope.
Claims (10)
1. a kind of preparation method of high rigidity melamine sheeting caps, it is characterised in that including step：
A, temperature be 110~170 DEG C, speed be 18~23m/min under conditions of, paper is impregnated into urea well prepared in advance
In urea formaldehyde and cyanurotriamide modified urine glue, prepared spread is 50~60% melamine facial tissue；
B, the melamine facial tissue is attached to the upper and lower surface of substrate respectively after, be put into it is pre-conditioned under press in pressed
System, obtains high rigidity melamine sheeting caps.
2. the preparation method of high rigidity melamine sheeting caps according to claim 1, it is characterised in that the Lauxite is pressed
Percentage by weight meter includes：The formaldehyde of 45%-52%, the urea of 20%-25%, the black network tropine of 2.4%-2.6%, 7%-
8% water and the ammonia spirit of 4%-5%.
3. the preparation method of high rigidity melamine sheeting caps according to claim 2, it is characterised in that the Lauxite
Amount of solid is 41~47%, and gel time is 100~150s.
4. the preparation method of high rigidity melamine sheeting caps according to claim 1, it is characterised in that the melamine changes
Property urine glue include by weight percentage：The formaldehyde of 42%-50%, the methyl alcohol of 18%-20%, the urea of 15%-19%,
The ammonia spirit of the black network tropine of 2.4%-3%, the melamine of 6%-6.9%, the water of 7%-8% and 4%-5%.
5. the preparation method of high rigidity melamine sheeting caps according to claim 4, it is characterised in that the melamine changes
Property urine glue amount of solid be 46~50%, gel time be 70~90s.
6. the preparation method of high rigidity melamine sheeting caps according to claim 1, it is characterised in that in the step B
It is pre-conditioned to be：Press pressure is 45~110bar, and temperature first is increased into 135~155 DEG C in 1~10min, is then incubated
70~110min.
7. the preparation method of high rigidity melamine sheeting caps according to claim 1, it is characterised in that the substrate is density
It is 800-1000kg/m3Fiberboard.
8. the preparation method of high rigidity melamine sheeting caps according to claim 1, it is characterised in that the thickness of the substrate
It is 2.35-2.65mm.
9. the preparation method of high rigidity melamine sheeting caps according to claim 1, it is characterised in that in the step A
Paper is the one kind in titanium white paper, balance paper, bleached wood pulp paper.
10. a kind of high rigidity melamine sheeting caps, it is characterised in that any one preparation method is prepared into using claim 1~9
Arrive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN107650465A (en) * | 2017-09-14 | 2018-02-02 | 深圳市柳鑫实业股份有限公司 | A kind of boring backing plates of PCB and preparation method thereof |
| CN107696647A (en) * | 2017-09-18 | 2018-02-16 | 乐凯特科技铜陵有限公司 | A kind of boring backing plates of pcb and preparation method thereof |
| CN108016113A (en) * | 2017-12-20 | 2018-05-11 | 贺州宝兴新材料有限公司 | Boring melamine plates of PCB and preparation method thereof |
| CN112123892A (en) * | 2020-10-28 | 2020-12-25 | 深圳市柳鑫实业股份有限公司 | Cover plate and preparation method thereof |
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