CN103773309A - PVB (Polyvinyl Butyral) wood adhesive and preparation method thereof - Google Patents

Abstract

The invention relates to a PVB (Polyvinyl Butyral) wood adhesive. The PVB is modified with rosin, so that the PVB is waterborne, and the wood adhesive is prepared from the modified PVB and auxiliary materials such as a polyacrylate adhesive. The product has the characteristics of simple synthesis, durability, low-temperature resistance, high transparency, non-toxicity, environment friendliness and high bonding strength, is used for wood adhesion, is high in initial adhesion, rapid in curing and stable in emulsion and has good market prospects.

Description

A kind of PVB wood adhesive and preparation method thereof

Technical field

The present invention relates to a kind of PVB wood adhesive and preparation method thereof.

Background technology

For meeting the ever-increasing demand of timber-work, artificial fast growing wood and small diameter grade assortment will become the main raw material of wood processing industry.Therefore, making full use of felling residuum, industrial wood waste and inferior timber development wood-based plate and artificial splicing goods, is one of effective measure that solve timber imbalance between supply and demand, and tackiness agent plays very important effect therein.

Synthetic macromolecule adhesive particularly formaldehyde is the application of tackiness agent in timber industry, has greatly promoted the development of wood-based panel industry, still, has also brought the problem of free formaldehyde contaminate environment.The over-all propertieies such as polyvinyl butyral acetal (PVB) has that tensile strength is high, impact property is good, transparency and good toughness, selecting PVB to prepare tackiness agent is because containing secondary hydroxyl in its molecular chain, can with other resin generation crosslinking reactions, form cubic network molecular structure.

Summary of the invention

The present invention aims to provide a kind of modification PVB wood adhesive and preparation method thereof.

The present invention realizes by following technology:

(1) rosin is placed in to 3-4 doubly measures (V:M) 5% NaOH solution, stir and be warming up to 90 ℃, add rosin amount 0.1-0.2 OP-10 emulsifying agent doubly, dissolve completely to rosin, stop heating, continue to stir, for subsequent use in 8O ℃ of insulation; Get PVB sheet and add in 6-8 times of (V:M) ethanol, 80 ℃ of stirring and dissolving, then add PVB 0.1-0.2 OP and DBP doubly, and be cooled to 60 ℃ and stir 2h, be cooled to room temperature and obtain yellow viscous fluid;

(2) get the deionized water that PVA adds 8 times of amounts, be warming up to 90 ℃, drip the methyl methacrylate of 1/8 amount of deionized water, with 10% sodium carbonate solution tune pH to 5-7;

(3) step 2 products therefrom is cooled to 70 ℃, slowly adds the yellow viscous fluid of step 1 gained, after stirring, be warming up to 90 ℃, be incubated 1 hour, be cooled to 30 ℃, to obtain final product.

The PVB wood adhesive that the present invention makes is for bonding wood, and initial bonding strength is large, solidify rapidly, emulsion-stabilizing, environmental friendliness.

Embodiment

Embodiment 1

(1) 5g rosin is placed in to 15ml 5% NaOH solution, stirs and be warming up to 90 ℃, add the OP-10 emulsifying agent of rosin amount 0.5g, dissolve completely to rosin, stop heating, continue to stir, for subsequent use in 8O ℃ of insulation; Get 3g PVB sheet and add in 18ml ethanol, 80 ℃ of stirring and dissolving, then add OP and the each 0.3g of DBP, and be cooled to 60 ℃ and stir 2h, be cooled to room temperature and obtain yellow viscous fluid;

(2) get 5g PVA and add in 40ml deionized water, be warming up to 90 ℃, drip methyl methacrylate 5ml, with 10% sodium carbonate solution tune pH to 5-7;

(3) step 2 products therefrom is cooled to 70 ℃, slowly adds the yellow viscous fluid of step 1 gained, after stirring, be warming up to 90 ℃, be incubated 1 hour, be cooled to 30 ℃, to obtain final product.

Embodiment 2

(1) rosin 100g is placed in to 400ml 5%NaOH solution, stirs and be warming up to 90 ℃, add the OP-10 emulsifying agent of rosin amount 20g, dissolve completely to rosin, stop heating, continue to stir, for subsequent use in 8O ℃ of insulation; Get 60g PVB sheet and add in 480ml ethanol, 80 ℃ of stirring and dissolving, then add OP and the each 12g of DBP, and be cooled to 60 ℃ and stir 2h, be cooled to room temperature and obtain yellow viscous fluid;

(2) get 100g PVA and add 800ml deionized water, be warming up to 90 ℃, drip methyl methacrylate 100ml, with 10% sodium carbonate solution tune pH to 5-7;

(3) step 2 products therefrom is cooled to 70 ℃, slowly adds the yellow viscous fluid of step 1 gained, after stirring, be warming up to 90 ℃, be incubated 1 hour, be cooled to 30 ℃, to obtain final product.

The prepared PVB wood adhesive of the present invention has following performance:

1. viscosity

Use NDJ-9s Digital Viscometer, measure by GB/T 2794-1995.

2. stability

Mechanical stability: with 800 type centrifuge separators, under 3000r/min, rotate continuously 15 minutes, bureaucratic airs has or not layering; Room temperature stability: room temperature lower seal leaves standstill, and routine observation has or not layering.

3. solid content

Measure with reference to GB/T 2793-1995

4. the cohesiveness of sizing agent

Wood specimen size 12cm*6cm*1.5cm, bond length 12cm, press curing 5d.Style is soaked respectively in 70 ℃ of water, 10% sulfuric acid and 10% sodium hydroxide solution, test water tolerance, erosion resistance.

5. surface drying time and doing solid work the time

Get the sizing agent of appropriate preparation, be applied on the glass dish after cleaning, test surface drying time and do solid work the time.

The results are shown in Table 1

PVB wood adhesive prepared by the present invention is for bonding wood, and initial bonding strength is large, curing rapidly, emulsion-stabilizing.

Claims (1)

1. a PVB wood adhesive, is characterized in that obtaining by the following method:

(1) rosin is placed in to 3-4 doubly measures (V:M) 5% NaOH solution, stir and be warming up to 90 ℃, add rosin amount 0.1-0.2 OP-10 emulsifying agent doubly, dissolve completely to rosin, stop heating, continue to stir, for subsequent use in 8O ℃ of insulation; Get PVB sheet and add in 6-8 times of (V:M) ethanol, 80 ℃ of stirring and dissolving, then add PVB 0.1-0.2 OP and DBP doubly, and be cooled to 60 ℃ and stir 2h, be cooled to room temperature and obtain yellow viscous fluid;

(2) get the deionized water that PVA adds 8 times of amounts, be warming up to 90 ℃, drip the methyl methacrylate of 1/8 amount of deionized water, with 10% sodium carbonate solution tune pH to 5-7;

(3) step 2 products therefrom is cooled to 70 ℃, slowly adds the yellow viscous fluid of step 1 gained, after stirring, be warming up to 90 ℃, be incubated 1 hour, be cooled to 30 ℃, to obtain final product.