Phenolic resin and process for making same专利检索-刨花板加工型木材产品建筑材料建筑材料专利检索查询-专利查询网

Phenolic resin and process for making same

阅读：611发布：2022-09-18

专利汇可以提供Phenolic resin and process for making same专利检索，专利查询，专利分析的服务。并且A resin suitable for use in the caulless system of composition board manufacture is prepared by a controlled reaction of phenol with formaldehyde in the presence of small amounts of sodium hydroxide catalyst. One mole of phenol is reacted with from about 2.5 to 3.5 moles of formaldehyde in the presence of caustic soda catalyst to form a first stage resin having a viscosity of 150 300 cps at 77*F. Additional phenol in the range of 0.25 moles to 0.5 moles per mole of phenol in the initial reaction is then added as a second stage and the resin is again reacted to a viscosity of 150 to 750 centipoises. The amount of phenol added is that amount necessary to impart to particles of wood coated with the resin sufficient tack to cause them to adhere to each other and form a sheet of sufficient structural integrity and firmness to normal transfer operations in the caulless system of particle board manufacture. The resin has a pH of about 8.5 to about 10. Its cure may be accelerated by adding about 2 - 4 percent resorcinol formaldehyde resin.，下面是Phenolic resin and process for making same专利的具体信息内容。

权利要求

1. A METHOD OF PREPARING A PHENOLIC RESIN HAVING IMPROVED CURRING SPEED, WETTING PROPERTIES, FLOW CHARACTERISTICS AND TACK IMPARTING PROPERTIES UNDER HOT PRESS PARTICLE BOARD MOLDINNG CONDITIONS SUITABLE FOR USE IN THE CAULLESS PRODUCTION OF PARTICLE BOARD, SAID METHOD COMPRISING:

1. REACTING PHENOL WITH A MOLAR EXCESS OF FORMALDEHYDE IN THE RANGE OF ABOUT 2.5 TO 3.5 MOLES OF FORMALDEHYDE PER MOLE OF PHENOL IN AN AQUEOUS MEDIUM UTILIZING AN ALKALINE CATALYST UNTIL THE RESULTING AQUEOUS RESIN HAS A BROOKFIELD VISCOSITY AT 77*F WITHIN THE RANGE 150 CPS TO 300 CPS TO FORM A FIRST STAGE RESIN,

2. ADDING FROM ABOUT 0.25 TO ABOUT 0.50 MOLES OF PHENOL PER MOLE OF PHENOL IN THE REACTION OF STEP (1), SAID ADDED PHENOL BEING SUFFICIENT TO IMPART TACK CHARACTERISTICS TO WOOD PARTICLES COATED WITH THE RESIN,

2. adding from about 0.25 to about 0.50 moles of phenol per mole of phenol in the reaction of step (1), said added phenol being sufficient to impart tack characteristics to wood particles coated with the resin,

2. The process of claim 1 wherein the alkaline catalyst is sodium hydroxide.

3. The process of claim 2 wherein the molar proportion of catalyst is in the range 0.2 to 0.3 based upon the number of moles of phenol initially reacted and the pH of the final resin is in the range of about 8.5 to about 10.

3. continuing the reaction until the aqueous resin has a Brookfield viscosity within the range 150 cps to 750 cps, and

3. CONTINUING THE REACTION UNTIL THE AQUEOUS RESIN HAS A BROOKFIELD VISCOSITY WITHIN THE RANGE 150 CPS TO 750 CPS, AND

4. RAPIDLY COOLING THE AQUEOUS RESIN TO A TEMPERATURE LESS THAN 80*F.

4. rapidly cooling the aqueous resin to a temperature less than 80*F.

4. The process of claim 3 wherein the catalyst is added incrementally to prevent excessive heat build-up in the reactor.

5. The process of claim 1 wherein the molar ratio of formaldehyde to phenol in the final resin is from about 1.8 to 1 to about 3.0 to 1.

6. The process of claim 4 wherein the second stage resin is kept at a temperature from about 160*F - 180*F until the Brookfield viscosity within the range 250 to 275 cps is reached.

7. A process as recited in claim 1 wherein the viscosity range in step (1) is about 175 cps to about 225 cps.

8. A process as recited in claim 1 wherein the amount of phenol added in step (2) is in the range of about 0.30 moles to about .40 moles per mole of phenol in the initial reaction.

9. A process as recited in claim 1 wherein the molar ratio of formaldehyde to phenol in the reaction of step (1) is in the range of about 3.0 to about 3.5.

10. A phenolic resin prepared by the process of claim 1.

11. A phenolic resin prepared by the process of claim 4.

12. A phenolic resin prepared by the process of claim 6.

说明书全文

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Phenolic resin and process for making same

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