阅读说明：本技术 一种零甲醛防潮颗粒板的制备工艺 (A kind of preparation process of zero formaldehyde moisture-proof granule plate ) 是由 林卫东 张凤岚 冉小锋 邹明星 谭锋明 陈瑞健 于 2019-08-11 设计创作，主要内容包括：本发明涉及一种零甲醛防潮颗粒板的制备工艺,其技术方案要点是：将原木堆放后经削片、刨片、干燥及筛选制得表层原料和芯层原料两种刨花颗粒,再添加高效防水剂、PMDI生态胶水和无醛胶粘剂进行混合,经铺装、预压、热压以及后期处理制得成品颗粒板即可分检入库。本发明的一种零甲醛防潮颗粒板的制备工艺,制得的防潮颗粒板成品具有零甲醛含量、热固性好、防水能力强以及强度高的优点和生产工艺易于实现。(The present invention relates to a kind of preparation processes of zero formaldehyde moisture-proof granule plate, its key points of the technical solution are that: it chipped after log is stacked, flaking, drying and obtain two kinds of wood shavings particles of top layer raw material and core layer raw material by screening, high-effect water-proof agent, PMDI ecology glue and aldehyde-free cement is added again to be mixed, mated formation, precompressed, hot pressing and post-processing finished product particle board can sorting storage.The preparation process of zero formaldehyde moisture-proof granule plate of one kind of the invention, moisture-proof granule board finished product obtained have the advantages that zero content of formaldehyde, thermosetting property are good, waterproof ability is strong and intensity is high and production technology is easily achieved.)

1. a kind of preparation process of zero formaldehyde moisture-proof granule plate, it is characterised in that production stage is:

(1) it chips: carrying out processing of chipping, slice obtained after log is stacked；

(2) flaking: by slice planing at having a size of wood shavings particle；

(3) dry: wood shavings particle, which is dried to moisture content, using German Dieffenbacher single-pass formula roller drier SPE5*27M is 1.0-3.5%；

(4) it screens: the wood shavings particle after drying is divided into top layer raw material and core layer raw material；

(5) glue mixing: PMDI ecology glue, aldehyde-free cement, high-effect water-proof agent are mixed with two kinds of wood shavings particles respectively；

(6) mat formation: surface layer and sandwich layer are mated formation obtained slab on demand；The actual weight for slab of mating formation is detected with slab weighing belt Afterwards, then with the mobile density tester that Dieffenbacher Corp. produces slab weight fluctuation situation is detected；It is visited with iron remover, metal It surveys device and removes iron, aluminium, copper sundries etc. in slab；Finally use preformer precompressed；

(7) slab precompressed: is suppressed using continous way precompressed mode；

(8) hot pressing: after slab enters press, the hydraulic cylinder of press two sides, the Multi-cylinder of press front act on pressure The adhesive in slab is fully cured in heating platen, so that slab be made to be glued together, particieboard is made；

(8) post-processing: slab obtained is subjected to sanding processing after turnover panel, stacking health, then sawing obtains finished product Grain plate, sorting storage.

2. a kind of preparation process of zero formaldehyde moisture-proof granule plate according to claim 1, it is characterised in that: aldehyde-free cement Preparation method source be earlier application publication No. be a kind of aldehyde-free cement of CN108504320A preparation method and its answer Patent of invention；PMDI ecology glue derives from Wan Hua company.

3. a kind of preparation process of zero formaldehyde moisture-proof granule plate according to claim 1, it is characterised in that: high-effect water-proof agent Preparation method be:

(1) fasten cooling water valve, emulsification bottom valve, into reaction kettle add water 1200kg, add semi-refined paraffin wax 750kg with And emulsifier 100kg；

(2) heating dissolves at semi-refined paraffin wax bottom to no bulk, mixes slowly to 98 DEG C of beginning timing, and controlling steam valve makes temperature Degree stirs 10 minutes at 98~99 DEG C；

(3) it shuts steam valve and stops gas supply, change up fast stirring after 3 minutes, slowly open 98~99 DEG C of steam valve holding and stir It mixes and turns off steam after ten minutes；

(4) it opens steam bottom valve to empty by the residue vapor in reaction kettle inner coil pipe, continues stirring 5 minutes, be then slowly added into The ammonium hydroxide 26kg that content is 21%, the used time 2~3 minutes；

(5) it adds after ammonium hydroxide continues stirring 25 minutes and stops high-speed stirred, open to mix slowly and be cooled to room temperature.

4. the preparation process of zero formaldehyde moisture-proof granule plate of one kind as described in claim 1, it is characterised in that: the log is primibranch Fork material, purchased wood chip, sawdust wood chaff, furniture waste material, density is in 500-800kg/m3, and moisture content is in 40-65%.

5. the preparation process of zero formaldehyde moisture-proof granule plate of one kind as described in claim 1, it is characterised in that: in the step (2) Using German Perlman ring flaker PZKP14-450, length 10~25mm, the wide 4~10mm of wood shavings particle, thick by 0.2~ 0.5mm。

6. the preparation process of zero formaldehyde moisture-proof granule plate of one kind as described in claim 1, it is characterised in that: in the step (4) Middle to carry out surface layer and sandwich layer screening using the screening installation with 1.35mm sieve pore, being less than 1.35mm is surface layer, otherwise is sandwich layer.

7. the preparation process of zero formaldehyde log particle board of one kind as described in claim 1, it is characterised in that: in the step (5) Middle surface layer applies 5-8 parts of aldehyde-free cement, 3.0-3.5 parts of PMDI glue, and sandwich layer adds 4.0-5.0 parts of PMDI glue.

Technical field

The invention belongs to artificial board technology fields, more specifically, it relates to a kind of preparation of zero formaldehyde moisture-proof granule plate Technique.

Background technique

Moist-proof board is called particieboard, particle board, the particle made of timber or other ligno-cellulosic materials, applies gluing The wood-based plate composed under heating power and pressure effect after agent.It is mainly used for furniture and building industry and train, automobile bodies system It makes.It is primary raw material that particieboard, which is with wood particulate, then seeps and add glue, slim plate made of additive is repressed.Particieboard Humidity resistance it is stronger, absorb moisture content after the coefficient of expansion it is smaller, be widely used in cabinet, bathroom cabinet etc. humid environments cabinet class Product raw material.

Currently, the Chinese patent that notification number is CN106676974B discloses a kind of preparation method of environmental protection type moisture plate, Its key points of the technical solution are that: it will be stirred to react under glycerol and maleic acid water-bath, cool down, add behenic acid and the chloro- 2- of 3- Hydroxypropyl-trimethyl ammonium chloride stirs evenly, at emulsifier；Emulsifier and the AKD of melting are mixed, water-bath mixing, Cleavage reaction, cleavage reaction heat water in the process, cooling, and modified AKD is made；Modified AKD and fiber have been blended in, stirred, At composite fibre slurry；Composite fibre slurry is put into molding die, is mated formation uniformly, drying obtains preforming fiber

Plate；Preforming fiberboard is subjected to cold, hot pressure, obtains environmental protection type moisture fiberboard.

Above scheme existing defects: its cross-linked stable of adhesive made from preparation process is poor, the moist-proof board produced Intensity is lower, can not deform under conditions of long-time, load-bearing are big.

Summary of the invention

In view of the deficiencies of the prior art, the present invention intends to provide a kind of preparation of zero formaldehyde moisture-proof granule plate Technique, moisture-proof granule board finished product obtained have the advantages that zero content of formaldehyde, thermosetting property are good, waterproof ability is strong and intensity is high and Production technology is easily achieved.

Above-mentioned technical purpose of the invention has the technical scheme that a kind of zero formaldehyde moisture-proof granule plate The production stage of preparation process be:

(1) it chips: carrying out processing of chipping, slice obtained after log is stacked

(2) flaking: by slice planing at having a size of wood shavings particle；

(3) dry: wood shavings particle, which is dried to moisture content, using German Dieffenbacher single-pass formula roller drier SPE5*27M is 1.0-3.5%；

(4) it screens: the wood shavings particle after drying being divided into top layer raw material and core layer raw material, using the screening with 1.35mm sieve pore Equipment carries out surface layer and sandwich layer screening, and being less than 1.35mm is surface layer, otherwise is sandwich layer；

(5) glue mixing: PMDI ecology glue, aldehyde-free cement, high-effect water-proof agent are mixed with two kinds of wood shavings particles

(6) mat formation: surface layer and sandwich layer are mated formation obtained slab on demand；The actual weight for slab of mating formation is detected with slab weighing belt Afterwards, then with 265 PB movable type density tester of Dieffenbacher CBV-C slab weight fluctuation situation is detected；With iron remover, gold Belong to detector and removes iron, aluminium, copper sundries in slab；Finally use preformer precompressed.

(7) slab precompressed: is suppressed using continous way precompressed mode；

(8) hot pressing: after slab enters press, the hydraulic cylinder of press two sides, the Multi-cylinder of press front act on pressure The adhesive in slab is fully cured in heating platen, so that slab be made to be glued together, particieboard is made；

(8) post-processing: slab obtained is subjected to sanding processing after turnover panel, stacking health, then sawing obtains finished product Grain plate, sorting storage.

By using above-mentioned technical proposal, high-effect water-proof agent is added, the waterproof effect of particle board can be greatly improved, effectively Lower the thickness swelling rate of plate；Zero formaldehyde addition moisture-proof granule plate, this life is made using a kind of PMDI ecology glue The characteristics of state glue is that zero content of formaldehyde, thermosetting property are good and good with the rubber relay force of timber, and in sizing, workshop section adds PMDI ecology glue It is mixed with wood shavings particle, then adds the high aldehyde-free cement of tack and overcome the problems, such as plate blank molding, zero is produced after hot pressing The super environment protection damp-proof particle board of formaldehyde addition.

Preferably, the preparation method of aldehyde-free cement is: to reaction kettle sequentially add water, polyvinyl alcohol, xanthan gum with And acrylate and vinyl acetate emulsion, it is heated to defined temperature stirring, starch is added after cooling and vegetable protein is again stirring for, adjusts pH value, Blowing is sealed after stirring to be cooled；Required DBP, DOP are put into reaction kettle, is uniformly mixed, then sequentially adds MDI glue is heated to defined temperature stirring under nitrogen protection, and blowing is sealed after cooling；Before use, each component is filled Divide mixing, obtains the good adhesive of the tack without formaldehyde.

By using above-mentioned technical proposal, aldehyde-free cement overcomes the problems, such as plate blank molding, particieboard product intensity obtained Height, and without using formaldehyde to reduce the pollution in production process to atmospheric environment as raw material in preparation process.

Preferably, the preparation method of high-effect water-proof agent is:

(1) fasten cooling water valve, emulsification bottom valve, into reaction kettle add water 1200kg, add semi-refined paraffin wax 750kg with And emulsifier 100kg；

(2) heating thoroughly dissolves semi-refined paraffin wax to no bulk, mixes slowly to 98 DEG C of beginning timing, and controlling steam valve makes Temperature stirs 10 minutes at 98~99 DEG C；

(3) it shuts steam valve and stops gas supply, change up fast stirring after 3 minutes, slowly open 98~99 DEG C of steam valve holding and stir It mixes and turns off steam after ten minutes；

(4) it opens steam bottom valve to empty by the residue vapor in reaction kettle inner coil pipe, continues stirring 5 minutes, be then slowly added into 21% ammonium hydroxide 26kg, the used time 2~3 minutes；

(5) it adds after ammonium hydroxide continues stirring 25 minutes and stops high-speed stirred, open to mix slowly and be cooled to room temperature.

By using above-mentioned technical proposal, the high-effect water-proof agent prepared can greatly improve the waterproof effect of particle board, Effectively lower the thickness swelling rate of plate.

In conclusion the invention has the following advantages:

First, zero content of formaldehyde, environmentally protective, what is used is highly-safe；

Second, thermosetting property is good, waterproof ability is strong, long service life；

Third, intensity is high, can not deform under conditions of long-time, load-bearing are big.

Detailed description of the invention

Fig. 1 is the process flow chart of zero formaldehyde moisture-proof granule plate.

Specific embodiment

With reference to the accompanying drawings and examples, the present invention will be described in detail.

A kind of preparation process of zero formaldehyde moisture-proof granule plate, as shown in Figure 1, its production stage is:

(1) chip: selection density is generally in 500-800kg/m3, former brush wood, purchased wood chip, sawdust of the moisture content in 40-65% The logs such as the wooden chaff, furniture waste material are deposited into 5 meters of height, after carry out processing of chipping, be made thickness about 10-30MM slice；

(2) flaking: with Germany Perlman ring flaker PZKP14-450 by slice planing at length: 10~25mm, width: 4 ~10mm, thickness: the wood shavings particle of 0.2~0.5mm；

(3) dry: wood shavings particle, which is dried to moisture content, using German Dieffenbacher single-pass formula roller drier SPE5*27M is 1.0-3.5%；

(4) it screens: surface layer and sandwich layer screening is carried out using the screening installation with 1.35mm sieve pore, being less than 1.35mm is surface layer, It otherwise is sandwich layer；

(5) glue mixing: PMDI ecology glue, aldehyde-free cement, high-effect water-proof agent are mixed with two kinds of wood shavings particles；

(6) mat formation: the surface layer wood shavings of 5-8 parts of aldehyde-free cement, 3.0-3.5 parts of PMDI glue (Wan Hua company) will have been applied By quantitative feed bin, airflow pavement head completes shedding to mat formation and making for layer part in shaping slab and upper epidermis part Layer slab forms gradually distressed structure, while the sandwich layer wood shavings for adding 4.0-5.0%PMDI glue are passed through quantitative feed bin, machine Tool spreading head is shed the sandwich layer part completed in shaping slab mats formation, so that sandwich layer slab is made to form uniform shape structure, thus Slab is made；

(7) slab precompressed: is suppressed using continous way precompressed mode；

(8) hot pressing: slab is subjected to hot pressing using high temperature and obtains particieboard；

(9) post-processing: slab obtained is subjected to sanding processing after turnover panel, stacking health, then sawing obtains finished product Grain plate, sorting storage.

The preparation step of aldehyde-free cement is:

(1) prepare component A: to reaction kettle be added needed for water, then by required polyvinyl alcohol, xanthan gum, acrylate and vinyl acetate emulsion etc. according to In secondary addition reaction kettle, it is heated to defined temperature stirring 0.5h, adds required starch and vegetable protein again after cooling Stirring, adjusting ph value is 7.5~8.0, and blowing is sealed after stirring to be cooled；

(2) it makes component B: first required DBP, DOP being put into reaction kettle, be uniformly mixed, then sequentially add MDI glue, The stirring 0.5h of temperature as defined in being heated under nitrogen protection, blowing is sealed after cooling；

(3) before use, required component A and component B is mixed, the good adhesive of the tack without formaldehyde is obtained.

1: zero formaldehyde moisture-proof granule plate performance indicator of table

The detection data of table 2:PMDI ecology glue:

Name of product: polymethylene multi-phenenyl isocyanate

The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment, All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications are also answered It is considered as protection scope of the present invention.